Validation of Geant4 Bremsstrahlung models: first results

Chauvie, Stéphane; Guatelli, Susanna; Mascialino, B.; Pandola, L.; Pia, M.G.; Rodrigues, Pedro; Trindade, A.

doi:10.1109/nssmic.2006.354185

Cited by 9 publications

(9 citation statements)

References 12 publications

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“…G4 also includes high energy corrections such as the LPM-effect [101,102](Landau-Pomeranchuk-Migdal) and dielectric suppression [102,103], although these should have little effect for this application. Both G4 and OW have been validated within energy regions respectively higher [104] and lower than this experiment. These two approaches at the energies of this experiment differ substantially close to the bremsstrahlung endpoint.…”

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confidence: 65%

Pion photoproduction cross section at large momentum transfer

Sjögren¹

2015

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The Real Compton Scattering experiment was performed in Hall A at the Thomas Jefferson National Accelerator Facility. It was designed to measure, for Compton scattering and π 0-photoproduction, the differential cross section over a range of kinematic points and the polarisation transfer to the proton at a single kinematic point. The full range of the experiment in Mandelstam variables t and s was 1.64−6.46 GeV 2 and 4.82−10.92 GeV 2 respectively with beam energies of 2−6 GeV. The motivation for the experiment is to test the cross section and polarisation transfer predictions of perturbative QCD versus that of predictions from Generalised Parton Distribution models. This thesis will give an overview of the pertinent theory, experimental setup in Hall A and the extracting of the π 0-photoproduction cross section.

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confidence: 65%

Pion photoproduction cross section at large momentum transfer

Sjögren¹

2015

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“…Further improvement could be achieved by introducing scatter correction. Several studies have investigated MC simulation techniques for the estimation of the scattered Bremsstrahlung photons [37][38][39][40].…”

Section: Further Remarks and Limitationsmentioning

confidence: 99%

Frozen Hybrid Kernelised Expectation Maximisation For Bremsstrahlung SPECT Reconstruction

Deidda

Denis-Bacelar

Fenwick

et al. 2021

Preprint

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Background: Selective internal radiation therapy with Yttrium-90 microspheres is an effective therapy for liver cancer and liver metastases. Yttrium-90 is mainly a high-energy beta particle emitter. These beta particles emit Bremsstrahlung radiation during their interaction with tissue making post-therapy imaging of the radioactivity distribution feasible. Nevertheless, image quality and quantification is difficult due to the continuous energy spectrum which makes resolution modelling, and attenuation and scatter estimation challenging. Methods: In this study, a modified hybrid kernelised expectation maximisation is used to improve resolution and contrast and reduce noise. The iterative part of the kernel was frozen at the 72nd sub-iteration to avoid over-fitting of noise and background. A NEMA phantom with spherical inserts was used for the optimisation and validation of the algorithm, and data from 5 patients treated with Selective internal radiation therapy were used as proof of clinical relevance of the method. Results: The results suggest a maximum improvement of 56% for region of interest mean recovery coefficient at fixed coefficient of variation and better identification of the hot volumes in the NEMA phantom. Similar improvements were achieved with patient data, showing 47% mean value improvement over the gold standard used in hospitals. Conclusions: Such quantitative improvements could facilitate improved dosimetry calculations with SPECT when treating patients with Selective internal radiation therapy, as well as provide a more visible position of the cancerous lesions in the liver.

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“…In recent years some validation of electromagnetic processes in Geant4 has been performed at small and intermediate energies [17]. In this work Bremsstrahlung description for very high energetic electrons is analyzed.…”

Section: Validationmentioning

confidence: 99%

Improved description of Bremsstrahlung for high-energy electrons in Geant4

Schälicke

Ivanchenko

Maire

et al. 2008

2008 IEEE Nuclear Science Symposium Conference Record

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Abstract-Geant4[1] provides a software toolkit for the simulation of particles through matter. It has wide range of applicability, ranging from high-energy particle physics to space science.The physics description of Geant4 is in a constant process of improvement and validation. In this work a new relativistic Bremsstrahlung model is introduced. The key feature is a consistent description of matter effects, esp. the Landau-PomeranchukMigdal (LPM) effect. The LPM effect will be of paramount importance for experiments at modern high-energy colliders, esp. the LHC, as well as in astroparticle physics applications.

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Validation of Geant4 Bremsstrahlung models: first results

Cited by 9 publications

References 12 publications

Pion photoproduction cross section at large momentum transfer

Pion photoproduction cross section at large momentum transfer

Frozen Hybrid Kernelised Expectation Maximisation For Bremsstrahlung SPECT Reconstruction

Improved description of Bremsstrahlung for high-energy electrons in Geant4

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