A comparative study of several digital flat panel X-ray units: patients doses and image quality in chest radiography
|
|
- Shanon Spencer
- 5 years ago
- Views:
Transcription
1 A comparative study of several digital flat panel X-ray units: patients doses and image quality in chest radiography Torres Cabrera R. 1, España López M.L. 2 Ruiz Manzano P. 3, Sastre Aguado J.M. 4,, Rivas Ballarin M. A. 3, Ferrer García N. 4, Hernando González I 1.,Peinado Montes M. 1, Floriano Pardal A. 2, Arranz y Carrillo de Albornoz L. 4, López Franco P. 2 1 Servicio de Radiofísica y Protección Radiológica. H. U. Río Hortega Valladolid, Spain rtorres@hurh.sacyl.es 2 Servicio de Física y Protección Radiológica. H. U. La Princesa, Madrid, Spain mespana.hlpr@salud.madrid.org 3 Servicio de Física y Protección Radiológica. H.C.U. "Lozano Blesa", Zaragoza, Spain fpro-pr@hcu-lblesa.es 4 Servicio de Física y Protección Radiológica. H.U. Ramón y Cajal, Madrid, Spain jsastrea.hrc@salud.madrid.org Abstract. The aim of this study is to evaluate and compare image quality and patients entrance surface dose (ESD) in PA and LAT chest examinations given by several digital flat panel X-ray units. Four hospitals are involved: H. C. U. Lozano Blesa of Zaragoza, H. U. de la Princesa of Madrid, H. U. Ramón y Cajal of Madrid, and H. Clínico Universitario of Valladolid. ESD received by 50 standard patients has been estimated, both for PA and LAT projections, by using the tube output and the radiographic technique (selected kvp, mas, patient thickness and focus-to-detector distance), assuming a standard backscattering factor (b f = 1.35). Average values for ESD in PA chest and in LAT chest are much lower than reference values (PA:0,3 mgy; LAT: 1,5 mgy) although a wider range can be seen in the mean values, partly due to the use of additional filtration. Image quality has been evaluated with an anthropomorphic phantom (QC Phantom for digital and conventional chest radiography, Nuclear Associates ) and a contrast-detail test pattern (CDRAD type 2.0, Instrumentele Dienst). There is a direct relation between dose and image quality, so optimization processes should be carried out in order to ensure a minimum dosis compatible with an image quality suitable for diagnosis. 1. Introduction Direct capturing of digital images in radiology (DR) by means of flat-panel X-ray image detectors is being progressively implemented in medical practice due to the multiple benefits of this technique: its capacity for providing higher-quality images, the possibility of image processing, the dramatic reduction of rejection rate, and a much longer range of radiation response than any given screen/film conventional system. Additionally, these systems possess a higher DQE (Detective Quantum Efficiency), making it possible to obtain images with the same noise level as in a conventional system but with lower radiation doses [1]. The relationship between radiation dose and image quality on different digital equipment, upon the analysis of phantom [2, 3] animal or [4] images, has been looked into in different publications. Some authors [5] recommend to add filtration for chest examinations in digital equipment, with the aim of reducing the dose as well as achieving an image quality similar to the one obtained with a conventional spectrum. The implementation of this new technology requires an estimation of the doses that are actually being administered in clinical practice, in order to check that, in cases of both day-to-day practice and optimisation protocols, doses are kept within reference values [6, 7] and as low as achievable in relation to the aimed image quality. The aim of this study is to evaluate and compare image quality and patients Entrance Surface Dose (ESD) in chest examinations (two projections PA and LAT) in flat-panel digital equipment in four 1
2 reference hospitals H. C. U. Lozano Blesa of Zaragoza, H. U. de la Princesa of Madrid, H. U. Ramón y Cajal of Madrid, and H. Clínico Universitario of Valladolid. 2. Materials and Methods The study has been carried out with four digital equipments used for chest examinations, whose characteristics are presented in Table I. Generator Tube Additional filtration Table I. Digital systems characteristics H1 H2 H3 H4 SIEMENS POLYDOROS LX 50 LITE SIEMENS OPTILIX 150/30/50C 0,1 / 0,2 / 0,3 mm Cu TOSHIBA KX0-60G TOSHIBA DRX HD --- PHILIPS OPTIMUS 50 PHILIPS RO ,1 mm Cu 1 mm Al GE Advant X-E GE Maxi Ray Detector Trixell CANON CXDI- 40G Trixell GE Revolution TM Size 43 x 43 cm 43 x 43 cm 43 x 43 cm 41 x 41 cm Matrix (pixels) 3000 x x x x 2048 Scintillator plate CsI Gd 2 O 2 S:Tb CsI CsI Anti scatter grid R:15/ N:80 f:180 R:12/ N:44 f:180 R:12/ N:36 f:180 R:13/ N:78 f:180 Sensitivity class Hard copy system FUJI FM-DP L AGFA Drystar 4500 FUJI Drypix 7000 KODAK Ektascan 2180 All instruments are programmed for an equivalent class sensitivity of 400, therefore the detector entrance dose should be approximately equivalent to 2,5 µgy per image, and they undergo regular quality controls [6] to check that all physical parameters are within tolerance values. Expected overall filter values and system performance values are shown in table II, including in the case of H1 both X- ray spectrum qualities used, without added filtration (H1) and with a 0,1 mm Cu filter (H1.1) Table II. Estimated Total Filtration (mm Al) and tube output at 1m( µgy/mas a 1 m.). Total Filtration 3,2 6,6 3,42 7,86 2,85 Tube output (80 kvp) 62, ,1 25,6 61 Tube output (kvp set) 132,8 89, ,7 124 Multimeter PMX-III PMX-III Victoreen 4000 M PMX-III Detector R-25 R-25 R-25 The dosimetric index value used has been the Entrance Surface Dose (ESD) for both chest projections (PA and LAT), with a sample of 50 patients in each facility. In centre H1, samples have been taken with and without an additional filtration of 0,1 mm Cu and in centre H3 all examinations have been 2
3 carried out with an additional filtration of 0,1 mm Cu + 1 mm Al. ESD has been estimated for each patient in the sample on the basis of actual parameters used in the examination and the previously measured tube output, assuming a standard backscattering factor (b f = 1.35). Image quality has been evaluated with an anthropomorphic phantom (QC Phantom for digital and conventional chest radiography, Nuclear Associates ) and a contrast-detail test pattern (CDRAD type 2.0, Instrumentele Dienst). Images have been evaluated by four independent experts separately, in the same format used by the radiologists of each centre, which in most cases has been hard copy system. 3. Results and discussion Patients doses Mean values of kv, mas and thickness under aforementioned conditions are shown in tables III and IV. Table III. Mean and standard deviation values. Chest PA projection mas (SD) 1,05 (0,19) 1,25 (0,19) 1,53 (0,82) 0,73 (0,23) 1,84 (0,34) Thickness (SD) (cm) 24 (1,8) 24,3 (1,8) 25,9 (2,8) 25,5 (2,2) 24,9 (1,7) kvp set (SD) 125 (0) 125 (0) 130 (0) 125 (0) 125 (1.1) Table IV. Mean and standard deviation values. Chest LAT projection mas (SD) 3,4 (1) 3,83 (1) 4,87 (2,33) 2,9 (1,12) 7,15 (2,9) Thickness (SD) (cm) 34 (2,3) 33,4 (2,4) 33,5 (2,8) 34,5 (2,6) 33,7 (2,3) kvp set (SD) 125 (0) 125 (0) 130 (0) 125 (0) 125 (1.1) Patients samples have got very similar thickness in the four centres, so we can consider them standard patients. Mean values of ESD are shown in tables V and VI. These values are much lower than reference values (PA:0,3 mgy; LAT: 1,5 mgy). ESD (SD) (mgy) Table V. Mean values and standard deviation. Chest PA projection FLAT PANEL SYSTEM 0,08 (0,015) 0,065 (0,01) 0,11 (0,06) 0,03 (0,01) 0,13 (0,025) Table VI. Mean values and standard deviation. Chest LAT projection FLAT PANEL SYSTEM ESD (SD) (mgy) 0,3 (0,093) 0,23 (0,064) 0,38 (0,17) 0,14 (0,05) 0,56 (0,24) The range of mean ESD values for the different systems is very wide, both for chest PA (0,03-0,13 mgy) and for chest LAT (0,14-0,56 mgy). This could be a consequence of the use of additional filters in hospitals 1 and 3. The consequence of adding 0,1 mm Cu is clearly shown in Hospital 1, where its use causes almost a 20% reduction in ESD, although this dosimetric index, useful and easy 3
4 to measure, may be not suitable enough when comparing doses between systems whose radiation spectra are quite different. In those cases other magnitudes that correlate better with the effective dose should be considered. Image quality FIG. 1. Evaluation of low-contrast systems performance FIG. 2. Evaluation of low-contrast systems performance corresponding to an exposure of 10 µgy at the wall-stand device entrance The results obtained with a CDRAD phantom are shown in figure 1. In each case, the radiographic technique and processing algorithm for a PA chest projection were applied. There is a significant difference regarding image quality between hospital H4 (which also applies the highest doses) and the other centres. The results may be even more relevant when image quality for the same entrance dose to the wall-stand device (10 µgy) is compared, as shown in figure 2. In this case, the number of objects detected in hospitals H3 and H4 is very similar, and superior to those detected in hospitals H1 and H2. It seems clear that increasing the dose in H3, image quality improves remarkably. Another result to be underlined is the difference in image quality between hospitals H1 and H3, although both include the same digital detector. Nevertheless there are other parameters which have got an effect on image quality (anti-scatter grid, processing algorithm used, etc.). Among all these factors, the image post- processing carried out by each system is particularly important, and that could give rise to significant differences. Figures 3 and 4 show the results for the chest PA technique obtained with an anthropomorphic phantom. Again, the highest number of detected objects corresponds to hospital H4 that, as can be seen in the curve corresponding to optic densities, presents a higher contrast in the lung area. If we compare figure 3 with figure 5, obtained with a dose of 10 µgy at the entrance of the wall-stand device, we can appreciate a remarkable improvement on image quality with increasing the dose. Thus, it could be inferred that in digital radiology there is a direct relation between dose and image quality. Therefore, optimisation processes should be carried out in order to ensure a minimum dose compatible with an image quality suitable for diagnosis. 4
5 The anthropomorphic phantom also includes a line-pair test pattern to evaluate spatial resolution. Results are consistent with pixel size in each detector, which determines the limiting frequency or Nyquist frequency: 2,5 pl/mm in hospital H4, 3,1 pl/mm in hospital H2, and 3,5 pl/mm in hospitals H1 and H3. In hospital H1 and H3, as their detectors consist of four assembled smaller panels, both the images obtained with the anthropomorphic phantom and those obtained with a resolution uniformity grid show a blind line at the interface. This transition zone is more visible in hospital H1 than in H3. In addition, correct visualisation of the resolution uniformity grid becomes particularly difficult in hospital H2, which is consistent with the fact that its scintillator is Gd 2 O 2 S:Tb, which, in principle, should produce a higher light diffusion than in the other cases, where CsI was used. FIG. 3. Test objects detected in the antropomorphic phantom. Chest PA radiographic technique and automatic control exposure 4. Conclusions The Entrance Surface Dose, measured in patients undergoing chest examinations in the digital equipments evaluated, does not exceed the reference dose values, although a wider range can be seen in the mean values of this dosimetric index, partly due to the use of additional filtration. Regarding image quality, bearing in mind that in all cases an image with diagnostic quality is obtained, in some centres quality could be improved by increasing the doses to levels similar to those of other centres. On the other hand, a dose reduction is often possible if a moderate decrease in image quality is accepted. Last, the monitor characteristics, or, in this case, the type of printer and its calibration, are not less important. In order to avoid their influence on the comparison of image quality, it would be necessary to capture images in digital format, visualising or printing them in the same device, but this is still not possible in a simple way in some of the equipment evaluated. FIG. 4. Optical densities measured in several thoracic regions FIG. 5. Test objects detected in the antropomorphic phantom corresponding to an exposure of 10µGy at wall-stand unit entrance 5
6 References 1. Harrell G. Chotas MS, James T. Dobbins, III, PhD and Carl E. Ravin MD. Principles of digital radiography with large-area, electronically readable detectors: a review of the basics Radiology 1999; 210: Hamer OW, Volk M, Zorger N, Feuerbach S, Strotzer M. Amorphous Silicon, Flat-Panel, X-Ray Detector Versus Storage Phosphor-Based Computed Radiography: Contrast-Detail Phantom Study at Different Tube Voltages and Detector Entrance Doses Invest Radiol 2003 Apr;38(4): Marshall NW, Faulkner K, Busch HP, Marsh DM, Pfenning H. A comparison of radiation dose in examination of the abdomen using different radiological imaging techniques Br J Radiol 1994 May;67(797): Karl Ludwig MD, Kathrin Ahlers BS, Dag Wormanns MD et als. Lumbar spine radiography: Digital Flat Panel detector versus screen-film and storage-phosphor systems in Monkeys as a pediatric model Radiology 2003; 229: Dobbins JT, Samei E, Chotas HG, Warp RJ et als Chest radiography: Optimization of X-ray spectrum for cesium iodide-amorphous silicon flat panel detector Radiology 2003; 226: Protocolo español de control de calidad en radiodiagnóstico. (Revisión 1). Aspectos técnicos. SEFM-SEPR European guidelines on quality criteria for diagnostic radiographic images. EUR EN. Junio Key words: X-ray dosimetry, digital, radiodiagnosis, flat panel, image quality 6
Practical Medical Physics Session: TG-151 Dose Monitoring. August 5, 2013 Katie Hulme, M.S.
Practical Medical Physics Session: TG-151 Dose Monitoring August 5, 2013 Katie Hulme, M.S. Digital Imaging and Dose Creep Images courtesy of Agfa Healthcare Under-Exposed Over-Exposed Freedman et al.,
More informationIMAGE QUALITY AND DOSE MANAGEMENT IN DIGITAL RADIOGRAPHY: A NEW PARADIGM FOR OPTIMISATION H. P. Busch 1 and K. Faulkner 2,
Radiation Protection Dosimetry (2005), Vol. 117, No. 1 3, pp. 143 147 doi:10.1093/rpd/nci728 Advance Access published on February 3, 2006 IMAGE QUALITY AND DOSE MANAGEMENT IN DIGITAL RADIOGRAPHY: A NEW
More informationDose Reduction and Image Preservation After the Introduction of a 0.1 mm Cu Filter into the LODOX Statscan unit above 110 kvp
Dose Reduction and Image Preservation After the Introduction of a into the LODOX Statscan unit above 110 kvp Abstract: CJ Trauernicht 1, C Rall 1, T Perks 2, G Maree 1, E Hering 1, S Steiner 3 1) Division
More informationOptimal speed for dual-energy subtraction neck imaging with flat-panel detector radiography
Optimal speed for dual-energy subtraction neck imaging with flat-panel detector radiography Poster No.: C-2938 Congress: ECR 2010 Type: Scientific Exhibit Topic: Physics in Radiology Authors: H. Machida
More informationWhile digital techniques have the potential to reduce patient doses, they also have the potential to significantly increase them.
In press 2004 1 2 Guest Editorial (F. Mettler, H. Ringertz and E. Vano) Guest Editorial (F. Mettler, H. Ringertz and E. Vano) Digital radiology An appropriate analogy that is easy for most people to understand
More informationHalf value layer and AEC receptor dose compliance survey in Estonia
Half value layer and AEC receptor dose compliance survey in Estonia K. Kepler, A. Vladimirov Training Centre of Medical Physics, University of Tartu Testing Centre of the University of Tartu, Estonia E-mail:
More informationEuropean Journal of Radiology
European Journal of Radiology 72 (2009) 202 208 Contents lists available at ScienceDirect European Journal of Radiology journal homepage: www.elsevier.com/locate/ejrad Digital radiography: The balance
More informationEstimation of signal transfer property for wireless digital detector in different measurement schemes
Estimation of signal transfer property for wireless digital detector in different measurement schemes Anatoli Vladimirov, Kalle Kepler Training Centre of Medical Physics, University of Tartu, Estonia 11
More informationExposure Indices and Target Values in Radiography: What Are They and How Can You Use Them?
Exposure Indices and Target Values in Radiography: What Are They and How Can You Use Them? Definition and Validation of Exposure Indices Ingrid Reiser, PhD DABR Department of Radiology University of Chicago
More informationDigital Image Management: the Basics
Digital Image Management: the Basics Napapong Pongnapang, Ph.D. Department of Radiological Technology Faculty of Medical Technology Mahidol University Outline From screen/film to digital radiography PACS/Tele
More informationAsk EuroSafe Imaging Tips & Tricks. Paediatric Imaging Working Group. Dose Management in Digital Radiography
Ask EuroSafe Imaging Tips & Tricks Paediatric Imaging Working Group Dose Management in Digital Radiography Raija Seuri (HUS Medical Imaging Center, FI) Cristina Almeida (Centro Hospitalar de Lisboa Central,
More informationDigital radiography (DR) post processing techniques for pediatric radiology
Digital radiography (DR) post processing techniques for pediatric radiology St Jude Children s Research Hospital Samuel Brady, MS PhD DABR samuel.brady@stjude.org Purpose Review common issues and solutions
More informationThe importance of radiation quality for optimisation in radiology
Available online at http://www.biij.org/2007/2/e38 doi: 10.2349/biij.3.2.e38 biij Biomedical Imaging and Intervention Journal COMMENTARY The importance of radiation quality for optimisation in radiology
More informationThe effect of compensating filter on image quality in lateral projection of thoraco lumbar radiography
Journal of Physics: Conference Series OPEN ACCESS The effect of compensating filter on image quality in lateral projection of thoraco lumbar radiography To cite this article: N A A Daud et al 2014 J. Phys.:
More informationEvaluation and Comparison of Image Quality for Indirect Flat Panel Systems with CsI and GOS Scintillators
Evaluation and Comparison of Image Quality for Indirect Flat Panel Systems with CsI and GOS Scintillators Mehmet E. Aksoy a, Mustafa E. Kamasak b, Erkan Akkur c, Ayhan Ucgul d, Muzaffer Basak d, Huseyin
More informationPATIENT EFFECTIVE DOSES IN DIAGNOSTIC RADIOLOGY, NA
Title of Paper: Patient effective doses in diagnostic radiology Authors: N.A. Gkanatsios, and W. Huda * Corresponding Author: Department of Radiology, University of Florida, P.O. Box 100374, Gainesville,
More informationStudies on reduction of exposure dose using digital scattered X-ray removal processing
Studies on reduction of exposure dose using digital scattered X-ray removal processing Poster No.: C-1834 Congress: ECR 2015 Type: Scientific Exhibit Authors: K. Kashiyama, M. Funahashi, T. Nakaoka, T.
More informationStudies on reduction of exposure dose using digital scattered X-ray removal processing
Studies on reduction of exposure dose using digital scattered X-ray removal processing Poster No.: C-1834 Congress: ECR 2015 Type: Scientific Exhibit Authors: K. Kashiyama, M. Funahashi, T. Nakaoka, T.
More informationMammography: Physics of Imaging
Mammography: Physics of Imaging Robert G. Gould, Sc.D. Professor and Vice Chair Department of Radiology and Biomedical Imaging University of California San Francisco, California Mammographic Imaging: Uniqueness
More informationIntroduction. Chapter 16 Diagnostic Radiology. Primary radiological image. Primary radiological image
Introduction Chapter 16 Diagnostic Radiology Radiation Dosimetry I Text: H.E Johns and J.R. Cunningham, The physics of radiology, 4 th ed. http://www.utoledo.edu/med/depts/radther In diagnostic radiology
More informationBreast Tomosynthesis. Bob Liu, Ph.D. Department of Radiology Massachusetts General Hospital And Harvard Medical School
Breast Tomosynthesis Bob Liu, Ph.D. Department of Radiology Massachusetts General Hospital And Harvard Medical School Outline Physics aspects of breast tomosynthesis Quality control of breast tomosynthesis
More informationDisclosures. Outline 7/31/2017. Current Implementation Status of IEC Standard : Exposure Index (EI) for Digital Radiography
Current Implementation Status of IEC Standard 62494-1: Exposure Index (EI) for Digital Radiography July 31, 2017 Ryan Fisher, PhD, DABR Katie Hulme, MS, DABR None Disclosures Outline Review of IEC Standard
More informationExposure in Dental Radiology: A Comparison Between Intra-oral, Panoramic and Tomographic Examinations
Exposure in Dental Radiology: A Comparison Between Intra-oral, Panoramic and Tomographic Examinations S. Baechler 1, P. Monnin 1, A. Aroua 1, J.F. Valley 1, M. Perrier, P. Trueb 3, F.R. Verdun 1 1 University
More informationQuality assurance: a comparison study of radiographic exposure for neonatal chest radiographs at 4 academic hospitals
DOI 10.1007/s00247-011-2290-1 ORIGINAL ARTICLE Quality assurance: a comparison study of radiographic exposure for neonatal chest radiographs at 4 academic hospitals Mervyn D. Cohen & Richard Markowitz
More informationSTATUS AND PROSPECTS OF DIGITAL DETECTOR TECHNOLOGY FOR CR AND DR Ulrich Neitzel Philips Medical Systems, Röntgenstrasse 24, D Hamburg, Germany
Radiation Protection Dosimetry (2005), Vol. 114, Nos 1-3, pp. 32 38 doi:10.1093/rpd/nch532 INVITED PAPER STATUS AND PROSPECTS OF DIGITAL DETECTOR TECHNOLOGY FOR CR AND DR Ulrich Neitzel Philips Medical
More informationOptimization of Image Quality and Patient Dose in Digital Radiography of the Chest
Original Article J Babol Univ Med Sci Vol 19, Issu 7; Jul 2017. P:57-62 Optimization of Image Quality and Patient Dose in Digital Radiography of the Chest R. Paydar (PhD) 1, S.H. Mousavie Anijdan (PhD)
More informationComparison of computed radiography and filmõscreen combination using a contrast-detail phantom
JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS, VOLUME 4, NUMBER 1, WINTER 2003 Comparison of computed radiography and filmõscreen combination using a contrast-detail phantom Z. F. Lu,* E. L. Nickoloff, J.
More informationDosimetry and optimization in digital radiography based on the contrast-detail resolution
BJRS BRAZILIAN JOURNAL OF RADIATION SCIENCES 06-03 (2018) 01-17 Dosimetry and optimization in digital radiography based on the contrast-detail resolution Batista a W.O.G., Carvalho b A.G. a Instituto Federal
More informationFeatures and Weaknesses of Phantoms for CR/DR System Testing
Physics testing of image detectors Parameters to test Features and Weaknesses of Phantoms for CR/DR System Testing Spatial resolution Contrast resolution Uniformity/geometric distortion Dose response/signal
More informationPublished text: Institute of Cancer Research Repository Please direct all s to:
This is an author produced version of an article that appears in: MEDICAL PHYSICS The internet address for this paper is: https://publications.icr.ac.uk/1316/ Copyright information: http://www.aip.org/pubservs/web_posting_guidelines.html
More information10/3/2012. Study Harder
This presentation is a professional collaboration of development time prepared by: Rex Christensen Terri Jurkiewicz and Diane Kawamura Study Harder CR detection is inefficient, inferior to film screen
More informationInvestigation of Effective DQE (edqe) parameters for a flat panel detector
Investigation of Effective DQE (edqe) parameters for a flat panel detector Poster No.: C-1892 Congress: ECR 2013 Type: Authors: Keywords: DOI: Scientific Exhibit D. Bor 1, S. Cubukcu 1, A. Yalcin 1, O.
More informationOptimization of Digital Mammography Resolution Using Magnification Technique in Computed Radiography 1
Optimization of Digital Mammography Resolution Using Magnification Technique in Computed Radiography 1 Gham Hur, M.D., Yoon Joon Hwang, M.D., Soon Joo Cha, M.D., Su Young Kim, M.D., Yong Hoon Kim, M.D.
More informationDigital Detector Array Image Quality for Various GOS Scintillators
Digital Detector Array Image Quality for Various GOS Scintillators More info about this article: http://www.ndt.net/?id=22768 Brian S. White 1, Mark E. Shafer 2, William H. Russel 3, Eric Fallet 4, Jacques
More informationQuality Control of Full Field Digital Mammography Units
Quality Control of Full Field Digital Mammography Units Melissa C. Martin, M.S., FACMP, FACR, FAAPM Melissa@TherapyPhysics.com 310-612-8127 ACMP Annual Meeting Virginia Beach, VA May 2, 2009 History of
More informationradiography detector
Clinical evaluation of a full field digital projection radiography detector Gary S. Shaber'1, Denny L. Leeb, Jeffrey Belib, Gregory Poweii1', Andrew D.A. Maidment'1 a Thomas Jefferson University Hospital,
More informationOverview of Safety Code 35
Common Quality Control Procedures for All s Quality Control Procedures Film All s Daily Quality Control Tests Equipment Warm-up (D1) According to manufacturers instructions Can include auto calibration(d1)
More informationDigital Chest Radiography with an Amorphous Silicon Flat-Panel-Detector Versus a Storage-Phosphor System:
Digital Chest Radiography with an Amorphous Silicon Flat-Panel-Detector Versus a Storage-Phosphor System: Comparison of Soft-Copy Images 1 Hyun Ju Lee, M.D., Jung-Gi Im, M.D., Jin Mo Goo, M.D., Chang Hyun
More informationCOMPUTED RADIOGRAPHY CHAPTER 4 EFFECTIVE USE OF CR
This presentation is a professional collaboration of development time prepared by: Rex Christensen Terri Jurkiewicz and Diane Kawamura New Technology https://www.youtube.com/watch?v=ptkzznazb 7U COMPUTED
More information10/26/2015. Study Harder
This presentation is a professional collaboration of development time prepared by: Rex Christensen Terri Jurkiewicz and Diane Kawamura Study Harder CR detection is inefficient, inferior to film screen
More informationBasis of Computed Radiography & PACS
Basis of Computed Radiography & PACS Slavik Tabakov Computed Radiography (CR) refers to new types of X-ray detectors (i.e. replaces the X-ray Film) The CR output media is a digital image, which can be
More informationDose reduction using Cu-filter for full-spine radiografic examination of patients with adolescent idiopathic scoliosis
Dose reduction using Cu-filter for full-spine radiografic examination of patients with adolescent idiopathic scoliosis Poster No.: C-0585 Congress: ECR 2015 Type: Scientific Exhibit Authors: K. Minehiro,
More informationAttikon, Rimini 1, , Athens, Greece , Athens, Greece , Athens, Greece
Radiation Protection Dosimetry (2005), Vol. 117, No. 1 3, pp. 291 297 doi:10.1093/rpd/nci742 Advance Access published on February 7, 2006 QUALITY ASSURANCE (QA) PROCEDURES FOR SOFTWARE: EVALUATION OF AN
More informationCXDI-70C WIRELESS SPECIFICATIONS
CXDI-70C WIRELESS SPECIFICATIONS Purpose Method Sensor Scintillator Pixel Pitch Pixels Image Size A/D Grayscale Wireless Standard Preview Image Access Time High Resolution Image Display Time Cycle Time
More informationBeam-Restricting Devices
Beam-Restricting Devices Three factors contribute to an increase in scatter radiation: Increased kvp Increased Field Size Increased Patient or Body Part Size. X-ray Interactions a some interact with the
More informationbiij Optimisation in general radiography CJ Martin, PhD, FIPEM, FioP Biomedical Imaging and Intervention Journal REVIEW PAPER
Available online at http://www.biij.org/2007/2/e18 doi: 10.2349/biij.3.2.e18 biij Biomedical Imaging and Intervention Journal REVIEW PAPER Optimisation in general radiography CJ Martin, PhD, FIPEM, FioP
More informationX-ray Imaging. PHYS Lecture. Carlos Vinhais. Departamento de Física Instituto Superior de Engenharia do Porto
X-ray Imaging PHYS Lecture Carlos Vinhais Departamento de Física Instituto Superior de Engenharia do Porto cav@isep.ipp.pt Overview Projection Radiography Anode Angle Focal Spot Magnification Blurring
More informationLearning Objectives: What s my motivation? (unknown screen actor) Workshop Overview
Practical Medical Physics Adapting Traditional Clinical Medical Physics to Digital Radiography Charles E. Willis, Ph.D., DABR Associate Professor Department of Imaging Physics The University of Texas M.D.
More informationAmorphous Selenium Direct Radiography for Industrial Imaging
DGZfP Proceedings BB 67-CD Paper 22 Computerized Tomography for Industrial Applications and Image Processing in Radiology March 15-17, 1999, Berlin, Germany Amorphous Selenium Direct Radiography for Industrial
More informationOutline. Digital Radiography. Understanding Digital Modalities: Image Quality and Dose. Image Quality. Dose Control
Understanding Digital Modalities: Image Quality and Dose S. Jeff Shepard, M.S. University of Texas M. D. Anderson Cancer Center Houston, Texas Special Acknowledgement: Stephen K. Thompson, M.S. William
More informationEvaluation of a quality control phantom for digital chest radiography
JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS, VOLUME 2, NUMBER 2, SPRING 2001 Evaluation of a quality control phantom for digital chest radiography Eugene Mah* Department of Radiology, Medical University
More informationDELWORKS DR MEDICAL. take the next step
DELWORKS DR MEDICAL take the next step DELWORKS MEDICAL DR If you are thinking of taking the next step to digital radiography, consider a DelWorks Medical DR Retrofit Package, the easy and affordable way
More informationY11-DR Digital Radiography (DR) Image Quality
Y11-DR Digital Radiography (DR) Image Quality Image quality is stressed for all systems in Safety Code 35. In the relevant sections Health Canada s advice is the manufacturer s recommended test procedures
More informationI. PERFORMANCE OF X-RAY PRODUCTION COMPONENTS FLUOROSCOPIC ACCEPTANCE TESTING: TEST PROCEDURES & PERFORMANCE CRITERIA
FLUOROSCOPIC ACCEPTANCE TESTING: TEST PROCEDURES & PERFORMANCE CRITERIA EDWARD L. NICKOLOFF DEPARTMENT OF RADIOLOGY COLUMBIA UNIVERSITY NEW YORK, NY ACCEPTANCE TESTING GOALS PRIOR TO 1st CLINICAL USAGE
More informationReport on the study and optimisation of chest and lumbar spine X-ray imaging
Institutionen för medicin och vård Avdelningen för radiofysik Hälsouniversitetet Report on the study and optimisation of chest and lumbar spine X-ray imaging Michael Sandborg, Graham McVey, David R Dance
More informationA Practical Overview of the Clinical and Operational Impact of Computed Radiography(CR) Implementations. Shirley Weddle, RT(R)(M), CIIP, BBA
A Practical Overview of the Clinical and Operational Impact of Computed Radiography(CR) Implementations Shirley Weddle, RT(R)(M), CIIP, BBA OBJECTIVES Define Computed Radiography (CR) Discuss CR vendor
More informationQUALITY CONTROL TESTS IN SOME DIAGNOSTIC X-RAY UNITS IN BANGLADESH
Bangladesh Journal of Medical Physics Vol. 4, No.1, 2011 QUALITY CONTROL TESTS IN SOME DIAGNOSTIC X-RAY UNITS IN BANGLADESH M. Begum 1, A. S. Mollah 2, M. A. Zaman 3 and A. K. M. M. Rahman 4 1 Health Physics
More informationSetting up digital imaging department!
Outline Setting up digital imaging department! From screen/film to digital radiography PACS/Tele radiology Setting up digital department Digital Imaging Napapong Pongnapang, Ph.D. Department of Radiological
More informationAppropriate Inspection Distance of Digital X-Ray Imaging Equipment for Diagnosis
Indian Journal of Science and Technology Vol 8(S8), 380-386, April 2015 ISSN (Print) : 0974-6846 ISSN (Online) : 0974-5645 DOI: 10.17485/ijst/2015/v8iS8/70528 Appropriate Inspection Distance of Digital
More informationSTEREOTACTIC BREAST BIOPSY EQUIPMENT SURVEYS
STEREOTACTIC BREAST BIOPSY EQUIPMENT SURVEYS JAMES A. TOMLINSON, M.S. Diagnostic Radiological Physicist American Board of Radiology Certified Medical Physics Consultants, Inc. Bio 28 yrs experience 100%
More informationREQUIREMENTS FOR LICENCE HOLDERS WITH RESPECT TO QUALITY CONTROL TESTS FOR DIAGNOSTIC X-RAY IMAGING SYSTEMS
REQUIREMENTS FOR LICENCE HOLDERS WITH RESPECT TO QUALITY CONTROL TESTS FOR DIAGNOSTIC X-RAY IMAGING SYSTEMS DEPARTMENT OF HEALTH DIRECTORATE: RADIATION CONTROL Implementation date: 31 March 2009 Contents
More informationImaging Technique Optimization of Tungsten Anode FFDM System
Imaging Technique Optimization of Tungsten Anode FFDM System Biao Chen a*, Andrew P. Smith b, Zhenxue Jing a, Elena Ingal a a Hologic, Inc. 600 Technology Drive, DE 1970 b Hologic, Inc. 35 Crosby Drive,
More informationDR General Radiography System. DR Series
DR General Radiography System ACH049_Shimadzu A4 Medical Bro 1 DR Series 6/5/08 2:41:22 PM High Productivity and Reliability: Hallmarks of Shimadzu X-ray Systems! With a near century of experience in manufacturing
More informationAuthors: Cabral, Ricardo 1 ; Carvoeiras, Pedro 2 ; Fatana, João 2, ; Alves, Rita 1. 1 Centro Hospitalar Lisboa Norte - Hospital de Santa Maria; 2
Authors: Cabral, Ricardo 1 ; Carvoeiras, Pedro 2 ; Fatana, João 2, ; Alves, Rita 1. 1 Centro Hospitalar Lisboa Norte - Hospital de Santa Maria; 2 Medical Consult, SA; Establish a method to correlate image
More informationAcceptance Testing of a Digital Breast Tomosynthesis Unit
Acceptance Testing of a Digital Breast Tomosynthesis Unit 2012 AAPM Spring Clinical Meeting Jessica Clements, M.S., DABR Objectives Review of technology and clinical advantages Acceptance Testing Procedures
More informationTESTING FLAT-PANEL IMAGING SYSTEMS: What the Medical Physicist Needs to Know. JAMES A. TOMLINSON, M.S., D.A.B.R. Diagnostic Radiological Physicist
TESTING FLAT-PANEL IMAGING SYSTEMS: What the Medical Physicist Needs to Know JAMES A. TOMLINSON, M.S., D.A.B.R. Diagnostic Radiological Physicist Topics Image Uniformity and Artifacts Image Quality - Detail
More informationThe Evaluation of Collimator Alignment of Diagnostic X-ray Tube Using Computed Radiography System
The Evaluation of Collimator Alignment of Diagnostic X-ray Tube Using Computed Radiography System The Evaluation of Collimator Alignment of Diagnostic X-ray Tube Using Computed Radiography System Manus
More informationAutomated dose control in multi-slice CT. Nicholas Keat Formerly ImPACT, St George's Hospital, London
Automated dose control in multi-slice CT Nicholas Keat Formerly ImPACT, St George's Hospital, London Introduction to presentation CT contributes ~50+ % of all medical radiation dose Ideally all patients
More informationA study of exposure index value fluctuations in computed radiography and direct digital radiography using multiple manufacturers
A study of exposure index value fluctuations in computed radiography and direct digital radiography using multiple manufacturers Poster No.: C-3011 Congress: ECR 2010 Type: Topic: Authors: Scientific Exhibit
More informationUnit thickness. Unit area. σ = NΔX = ΔI / I 0
Unit thickness I 0 ΔI I σ = ΔI I 0 NΔX = ΔI / I 0 NΔX Unit area Δx Average probability of reaction with atom for the incident photons at unit area with the thickness of Delta-X Atom number at unit area
More informationDosepix Detector as kvp-meter in Radiology and Mammography: First steps
Dosepix Detector as kvp-meter in Radiology and Mammography: First steps F.Bisello, I.Ritter, F.Tennert, A.Zang MediPix Collaboration Meeting, 19th February 2014, CERN Protect, Enhance, and Save Lives -
More informationJoint ICTP/IAEA Advanced School on Dosimetry in Diagnostic Radiology and its Clinical Implementation May 2009
2033-6 Joint ICTP/IAEA Advanced School on Dosimetry in Diagnostic Radiology and its Clinical Implementation 11-15 May 2009 Dosimetry for Fluoroscopy Basics Renato Padovani EFOMP Joint ICTP-IAEA Advanced
More informationPERFORMANCE CHARACTERIZATION OF AMORPHOUS SILICON DIGITAL DETECTOR ARRAYS FOR GAMMA RADIOGRAPHY
12 th A-PCNDT 2006 Asia-Pacific Conference on NDT, 5 th 10 th Nov 2006, Auckland, New Zealand PERFORMANCE CHARACTERIZATION OF AMORPHOUS SILICON DIGITAL DETECTOR ARRAYS FOR GAMMA RADIOGRAPHY Rajashekar
More informationof sufficient quality and quantity
of sufficient quality and quantity The patient s body attenuates the beam as it passes though the body More energy is deposited in organs located near the entry of the beam than near the exit of the beam
More informationOpen. the Digitized world. Fuji Computed Radiography
Open the Digitized world Fuji Computed Radiography If just one of these applies to you... Managing developing fluid is hard and darkroom work is a hassle... Images are not stable... Isn t digitalization
More informationTeaching Digital Radiography and Fluoroscopic Radiation Protection
Teaching Digital Radiography and Fluoroscopic Radiation Protection WCEC 20 th Student Educator Radiographer Conference Dennis Bowman, RT(R), CRT (R)(F) Community Hospital of the Monterey Peninsula (CHOMP)
More informationBASICS OF FLUOROSCOPY
Medical Physics Residents Training Program BASICS OF FLUOROSCOPY Dr. Khalid Alyousef, PhD Department of Medical Imaging King Abdulaziz Medical City- Riyadh Edison examining the hand of Clarence Dally with
More informationDR _ solutions. We understand that customers don t need just products, they want. solutions
DR _ solutions We understand that customers don t need just products, they want solutions index company profile 1974-2005 2006-2007 - 2008 ITALRAY Srl was founded in 1974 as the production branch of Marzocchi
More informationIranian Journal of Medical Physics
Iranian Journal of Medical Physics ijmp.mums.ac.ir A Phantom Study for the Optimization of Image Quality and Radiation Dose for Common Radiographic Examinations in Digital Radiography Soo-Foon Moey 1*,
More informationRadiology Physics Lectures: Digital Radiography. Digital Radiography. D. J. Hall, Ph.D. x20893
Digital Radiography D. J. Hall, Ph.D. x20893 djhall@ucsd.edu Background Common Digital Modalities Digital Chest Radiograph - 4096 x 4096 x 12 bit CT - 512 x 512 x 12 bit SPECT - 128 x 128 x 8 bit MRI -
More informationESTABLISHING A QUALITY ASSURANCE ROUTINE FOR DIGITAL IMAGING
ESTABLISHING A QUALITY ASSURANCE ROUTINE FOR DIGITAL IMAGING A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science By RANA AL SULAIMAN B.S. in Physics, King
More informationImage Quality Artifacts in Digital Imaging
MAHIDOL UNIVERSITY Wisdom of the Land Image Quality Artifacts in Digital Imaging Napapong Pongnapang, Ph.D. Department of Radiological Technology Faculty of Medical Technology Mahidol University, Bangkok,
More informationPreliminary Modulation Transfer Function Study on Amorphous Silicon Flat Panel System for Industrial Digital Radiography
ECNDT 26 - Poster 17 Preliminary Modulation Transfer Function Study on Amorphous Silicon Flat Panel System for Industrial Digital Radiography Khairul Anuar MOHD SALLEH, Ab. Razak HAMZAH and Mohd Ashhar
More informationCOST EFFECTIVE FLAT PANEL DIGITAL RADIOGRAPHY UPGRADE SOLUTIONS
COST EFFECTIVE FLAT PANEL DIGITAL RADIOGRAPHY UPGRADE SOLUTIONS DRive is a digital imaging DR hardware & Software solution designed for General Radiography of anatomy. It intended to replace film/screen
More information2217 US Highway 70 East Garner, NC Main: Fax:
Viztek is committed to providing the highest image quality possible in our CR & DR product lines. There are several factors that directly affect the overall quality of CR & DR based images. The eposure
More informationReducing Radiation Exposure from Survey CT Scans
Reducing Survey CT Scan Exposure Pediatric Imaging Original Research Jennifer C. O Daniel 1 Donna M. Stevens 2 Dianna D. Cody 2 O Daniel JC, Stevens DM, Cody DD Received July 28, 2004; accepted after revision
More informationX-RAYS - NO UNAUTHORISED ENTRY
Licencing of premises Premises Refer Guidelines A radiation warning sign and warning notice, X-RAYS - NO UNAUTHORISED ENTRY must be displayed at all entrances leading to the rooms where x-ray units are
More informationComputed Radiography
BAM Berlin Computed Radiography --INDE 2007, Kalpakkam, India -- Uwe Zscherpel, Uwe Ewert BAM Berlin, Division VIII.3 Requests Requests and and information information to: to: Dr. Dr. U. U. Zscherpel Zscherpel
More informationTest Equipment for Radiology and CT Quality Control Contents
Test Equipment for Radiology and CT Quality Control Contents Quality Control Testing...2 Photometers for Digital Clinical Display QC...3 Primary Workstations...3 Secondary Workstations...3 Testing of workstations...3
More informationSmartRAD. Advanced Digital Radiography System
SmartRAD Advanced Digital Radiography System SmartRAD Expanding The Horizons Of Digital Radiography CMT introduces the SmartRAD Digital Radiography system, featuring an integrated flat panel digital detector
More informationNuclear Associates
Nuclear Associates 07-649 CDRH Fluoroscopic Phantom Users Manual March 2005 Manual No. 07-649-1 Rev. 2 2004, 2005 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks
More informationNATIONWIDE EVALUATION OF X-RAY TRENDS (NEXT) TABULATION AND GRAPHICAL SUMMARY OF 2001 SURVEY OF ADULT CHEST RADIOGRAPHY
CRCPD Publication E-05-2 Available Online at No Charge $15.00 for a Computer-Generated Copy NATIONWIDE EVALUATION OF X-RAY TRENDS (NEXT) TABULATION AND GRAPHICAL SUMMARY OF 2001 SURVEY OF ADULT CHEST RADIOGRAPHY
More information3/31/2011. Objectives. Emory University. Historical Development. Historical Development. Historical Development
Teaching Radiographic Technique in a Digital Imaging Paradigm Objectives 1. Discuss the historical development of digital imaging. Dawn Couch Moore, M.M.Sc., RT(R) Assistant Professor and Director Emory
More informationDetermination of the tube voltage from clinic mammographic system using two types of detectors
BJRS BRAZILIAN JOURNAL OF RADIATION SCIENCES 03-1A (2015) 01-06 Determination of the tube voltage from clinic mammographic system using two types of detectors J. S. Barreira a ; V. Vivolo a a Gerência
More informationDIGITAL IMAGE PROCESSING IN X-RAY IMAGING
DIGITAL IMAGE PROCESSING IN X-RAY IMAGING Shalini Kumari 1, Bachan Prasad 2,Aliya Nasim 3 Department of Electronics And Communication Engineering R.V.S College of Engineering & Technology, Jamshedpur,
More informationIntroduction. Sam R. Kottamasu Lawrence R. Kuhns
Pediatr Radiol (1997) 27: 119 123 Springer-Verlag 1997 Sam R. Kottamasu Lawrence R. Kuhns Musculoskeletal computed radiography in children: scatter reduction and improvement in bony trabecular sharpness
More informationImproved Imaging Plate Dosimetry for X-rays in Interventional Radiology
Improved Imaging Plate Dosimetry for X-rays in Interventional Radiology H. Ohuchi 1, A. Yamadera 2, T.Satoh 3, Y,Eguchi 3 1 Graduate School of Pharmaceutical Sciences, Tohoku University, Aramaki,Aoba-ku,
More informationOptimization of chest radiographic imaging parameters: a comparison of image quality and entrance skin dose for digital chest radiography systems,
Clinical Imaging 36 (2012) 279 286 Optimization of chest radiographic imaging parameters: a comparison of image quality and entrance skin dose for digital chest radiography systems, Zhonghua Sun a,, Chenghsun
More informationPLD5600A High Frequency Digital Gastrointestinal &DR System(630mA)
PLD5600A High Frequency Digital Gastrointestinal &DR System(630mA) Application: Full support perspective, gastrointestinal spot film, GI (barium meal, barium enema), orthopedic photography, pediatrics
More informationRedefining Ergonomics
Samsung Electronics Co., Ltd. inspires the world and shapes the future with transformative ideas and technologies, redefining the worlds of TVs, smartphones, wearable devices, tablets, cameras, digital
More information