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Prototype system for proton beam range measurement based on gamma electron vertex imaging
Prototype system for proton beam range measurement based on gamma electron vertex imaging
- Source :
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 857:82-97
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- In proton therapy, for both therapeutic effectiveness and patient safety, it is very important to accurately measure the proton dose distribution, especially the range of the proton beam. For this purpose, recently we proposed a new imaging method named gamma electron vertex imaging (GEVI), in which the prompt gammas emitting from the nuclear reactions of the proton beam in the patient are converted to electrons, and then the converted electrons are tracked to determine the vertices of the prompt gammas, thereby producing a 2D image of the vertices. In the present study, we developed a prototype GEVI system, including dedicated signal processing and data acquisition systems, which consists of a beryllium plate (= electron converter) to convert the prompt gammas to electrons, two double-sided silicon strip detectors (= hodoscopes) to determine the trajectories of those converted electrons, and a plastic scintillation detector (= calorimeter) to measure their kinetic energies. The system uses triple coincidence logic and multiple energy windows to select only the events from prompt gammas. The detectors of the prototype GEVI system were evaluated for electronic noise level, energy resolution, and time resolution. Finally, the imaging capability of the GEVI system was tested by imaging a 90 Sr beta source, a 60 Co gamma source, and a 45-MeV proton beam in a PMMA phantom. The overall results of the present study generally show that the prototype GEVI system can image the vertices of the prompt gammas produced by the proton nuclear interactions.
- Subjects :
- Nuclear reaction
Nuclear and High Energy Physics
Physics::Instrumentation and Detectors
Astrophysics::High Energy Astrophysical Phenomena
chemistry.chemical_element
Electron
01 natural sciences
Imaging phantom
030218 nuclear medicine & medical imaging
Nuclear physics
03 medical and health sciences
0302 clinical medicine
Data acquisition
Optics
0103 physical sciences
Nuclear Experiment
Instrumentation
Proton therapy
010302 applied physics
Physics
Signal processing
business.industry
Detector
chemistry
Beryllium
business
Subjects
Details
- ISSN :
- 01689002
- Volume :
- 857
- Database :
- OpenAIRE
- Journal :
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- Accession number :
- edsair.doi...........1ad3092433864bf4f87cb7cc29f6ce2e
- Full Text :
- https://doi.org/10.1016/j.nima.2017.03.022