(Geant4) Monte Carlo benchmarking. Harald Paganetti
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1 (Geant4) Monte Carlo benchmarking Harald Paganetti
2 Why benchmarking? 1. We are in Medical Physics! 2. Monte Carlo is considered to be the gold standard 3. There are various competing codes/algorithms 4. We want confidence in our code
3 Types of Monte Carlo benchmarking A Benchmarking based on basic data B Benchmarking based on complex data
4 Types of Monte Carlo benchmarking A Benchmarking based on basic data Benchmarking done by developers (and users)
5 Types of Monte Carlo benchmarking A Benchmarking based on basic data cross section data need to be accessible (MCNPX?)
6 Types of Monte Carlo benchmarking A Benchmarking based on basic data B Benchmarking based on complex data Benchmarking done by users only (!) We can all contribute (e.g., Poon, Paganetti)
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9 Types of Monte Carlo benchmarking A Benchmarking based on basic data Often not sufficient! B Benchmarking based on complex data Often too user specific!
10 Types of Monte Carlo benchmarking A Benchmarking based on basic data B Benchmarking based on standard ( complex ) data Standard benchmarking problems should be simple (used by multiple users in various codes; easy error analysis)
11 Multi-Layer Faraday Cup (MLFC) Clean benchmark for nuclear models: p+ 80 % separated nuclear buildup region device has 100% acceptance for charged secondaries technique measures charge, not dose (no problems of dosimeter linearity and response to particle types) p+ p+.. charge A B C Cu Cu Cu e.g., (p,pn) charge : 0 (+p; -recoil) 1 (+p) p+.. n
12 7.6 cm x 7.6 cm
13 Multi-Layer Faraday Cup (MLFC) can be used for high and low-z! A B p+ p+ e.g., (p,pn) charge :.. p+ CH 2 CH 2 CH 2.. n charge 0 (+p -recoil) 1 (+p) A B C p+ p+.. Cu Cu Cu.. n e.g., (p,pn) charge : 0 (+p; -recoil) 1 (+p)
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15 Types of Monte Carlo benchmarking A Benchmarking based on basic data B Benchmarking based on standard complex data We need standard benchmarking problems
16 The Computational Medical Physics Working Group (CMPWG) is an international group dedicated to the pursuit of better computational tools in medical and health physics applications. CMPWG consists of individuals from the American Nuclear Society (ANS), American Association of Physicists in Medicine (AAPM), Society of Nuclear Medicine (SNM), Health Physics Society (HPS) among others. CMPWG is hosted by two divisions within the American Nuclear Society. Mathematics and Computations Division (MCD) Biology and Medicine Upcoming Conferences April ANS RPSD Carlsbad, New Mexico June ANS Annual Meeting - Reno, Nevada July AAPM 48th Annual Meeting - Orlando, Florida October First European Workshop on Monte Carlo Treatment Pla
17 Benchmarks Contribute a benchmark problem Submitted problems Radiation Therapy Brachytherapy External Beam Therapy Proton Therapy Imaging Nuclear Medicine Health Physics Too complex!
18 Submit only successful simulations to CMPWG and report unsuccessful ones to Geant4-developers!
19 Discussion: We should compare cross section data used by various codes WHO? We need to design a set of (simple) benchmarking problems WHO?
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