(Quantitative Imaging for) Colocalisation Analysis
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- Claud Bridges
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1 (Quantitative Imaging for) Colocalisation Analysis or Why Colour Merge / Overlay Images are EVIL! Special course for DIGS-BB PhD program
2 What is an Image anyway..? An image is a representation of reality (not real) Image of a point is not a point (Point Spread Function) Pixelated by detector (CCD or point scanner) A digital image of??? Image Analysis (Brain or Computer) A stick man? How do I know? How can computer know - algorithm?
3 What is an Image anyway..? Images contain information (not just pretty pictures) Manipulate Image = Changed Info (Brightness / Contrast - Extreme Caution!!!) Image data can be quantified / measured / analysed You cant add lost info back. Meta data (What, Where, When, How) A digital image How many objects? How bright is it? How big is it? What is it? etc.
4 Image Data? What is it? Intensity is related to what? Something physical? Dye concentration Or is it? Why not? Noisy Images? Averaging? Pixel Time? Comparison of 2 colours/dyes - Biology / BioChemistry / Interaction? Shapes, Movement, Structure? A digital image With 2 channels / colours What can you say here?
5 Photographer or Spectroscopist? We can show you how to take pretty pictures (Art) We can teach you to get useful information (Science) You have to choose which you want to be! This Is simply a way to Visualise This
6 Publishing Images or how Photoshop can ruin your career Which image? Prettiest? Representative? CCD/PMT sees intensities differently than your eye/brain LUT? Gamma correction? Calibrate Monitor - we have the tools! RBG colour space is not what we print! RGB - Visualise (LCD, CRT) CYMK - Print Journal Image! Screen Image Author instructions - image format? TIFF CYMK Materials and Methods - exact image processing done Image = data Don t corrupt information! PDF - reviewer can check image processing results! Compression - Lossless ok - Lossy (JPEG) very bad You wouldn t do it to any other kind of data
7 Quantitative Image Analysis? what does that mean? Pretty pictures are great for journal covers... Movies are great for visual presentation of images... Interactive 3D visualisation, data exploration... But for meaningful biological conclusions... Scientists need numerical results from image data Need to measure many objects Need statistics from many images Computers become useful!
8 Quantitative Microscopy - First Think... Choosing experimental and image processing methods: What BIOLOGY am I trying to see or measure? Do I need 3D information? Resolution? Object size? Choose / Optimise microscope system to use! Statistics? How many images / data points / experiments? Controls!!!
9 Experimental Design - First Think... Quantitative Experiments? Am I trying to measure the size/shape of some type of object(s) Am I trying to see movement over time? Am I trying to measure a number, amount or concentration?
10 Am I trying to measure the number of some type of object? Can I define how my objects appear in images? Segmentation Image intensity - threshold Size - threshold Shape - circularity etc.
11 Am I trying to see something move over time? Can I define what movement is? Linear - A to B? Direction Speed Velocity Rotation Clustering
12 Am I trying to measure an amount or concentration? Does that have a Biological meaning? Absolute or Relative? Can I calibrate my image intensity vs. something else / itself? eg. Fluorescence signal vs. Quantitative Assay or Baseline / Control Fluorescence response might not be linear!
13 Am I trying to measure an image parameter? Does that have a Biological meaning? Absolute or Relative? Total / Mean / SD of signal Background Signal : Noise Texture (smooth/spotty) Colocalisation between / channels colours
14 Signals within the range of the detector? Your eyes lie! You can t see low intensities close to black! Use Range Indicator / HiLo / OU and spectrum CLUTs Adjust so brightest part is within detector range. Remember to check z dir. also. Don t over expose the image! Why not? Lost Info! Bye Bye Data! 255 in range pixel intensity X clipped overexposed saturated
15 Image Histograms are your friends! Use them! log log no. of no. of OK! pixels pixels Clipped! intensity 255 intensity 255 Lost Info
16 Signal within the range of detector? Offset / Zero Background - Set properly. Why? background " zero, but keep low intensity info What is Background? You decide! Range indicator / HiLo CLUT - background black and blue ~5:5 ( = Blue, = Black, 254 = White, 255 = Red) too high too low correct
17 Pixel Size / Resolution Correct image size (64x64, 52x52, 248x248)? Get all information microscope can resolve, files not too big Proper spatial sampling (Nyquist sampling theory) pixels over optical resolution distance. (x, y and z) Adjust zoom and image size. Auto Pinhole or Airy unit Airy unit but under sampled over sampled correct sampling
18 Pixel Size / Resolution Correct image size (64x64 or 248x248 - or something else)? Airy unit Get all information microscope can resolve, but files not too big Proper spatial sampling (Nyquist sampling theory) pixels over optical resolution distance. (x, y and z) Adjust zoom and image size. Auto Pinhole or Airy unit under sampled over sampled correct sampling
19 Avoid Emission Bleed Through and Crosstalk/Cross-excitation Dye selection / Filter selection Emission bleed through and/or excitation crosstalk... Means you get: Overlapping emission - Quantitative? No! Use multi tracking (Zeiss) / sequential (Olympus)
20 Beware! Crosstalk and Bleed Through Alexa 488 Alexa 568 Wavelength (nm) Cross talk (wrong excitation) Bleed through (wrong emission)
21 Watch Out - More Holes To Fall Into: Correct objective lens / microscope setup for task N.A / Resolution. Apochromat for different colours (UV) Calibrate Scanner / Check with multi-colour beads
22 Watch Out - More Holes To Fall Into: Required bit depth - 8 bit often enough for LSCM imaging and colocalisation analysis. More bits only for quantitative experiments where small intensity differences are measured. 2 bit - bigger files than 8 bit. (Olympus... 2 bit only. Zeiss 8,2. Leica 8,2,6.) 6 bit file is 2x bigger in RAM / on disk, than 8 bit! CCD - some cases 2 bit might give better coloc info.
23 Watch Out - More Holes To Fall Into: Laser power - don t bleach area before imaging it. Bleached sample Lower signal : noise Lost information Set the HV and Offset quickly (Auto HV) Live imaging, bleaching - big problem Use low laser power (but more noise)
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