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A cost-effective monitoring technique in particle therapy via uncollimated prompt gamma peak integration
- Source :
- Applied Physics Letters, Applied Physics Letters, American Institute of Physics, 2017, 110 (15), pp.154102. ⟨10.1063/1.4980103⟩, Applied Physics Letters, 2017, 110 (15), pp.154102. ⟨10.1063/1.4980103⟩
- Publication Year :
- 2017
- Publisher :
- HAL CCSD, 2017.
-
Abstract
- International audience; For the purpose of detecting deviations from the prescribed treatment during particle therapy, the integrals of uncollimated prompt gamma-ray timing distributions are investigated. The intention is to provide information, with a simple and cost-effective setup, independent from monitoring devices of the beamline. Measurements have been performed with 65 MeV protons at a clinical cyclotron. Prompt gamma-rays emitted from the target are identified by means of time-of-flight. The proton range inside the PMMA target has been varied via a modulator wheel. The measured variation of the prompt gamma peak integrals as a function of the modulator position is consistent with simulations. With detectors covering a solid angle of 25 msr (corresponding to a diameter of 3–4 in. at a distance of 50 cm from the beam axis) and 108 incident protons, deviations of a few per cent in the prompt gamma-ray count rate can be detected. For the present configuration, this change in the count rate corresponds to a 3 mm change in the proton range in a PMMA target. Furthermore, simulation studies show that a combination of the signals from multiple detectors may be used to detect a misplacement of the target. A different combination of these signals results in a precise number of the detected prompt gamma rays, which is independent on the actual target position.
- Subjects :
- Physics and Astronomy (miscellaneous)
Proton
medicine.medical_treatment
Astrophysics::High Energy Astrophysical Phenomena
Cyclotron
[SDV.IB.MN]Life Sciences [q-bio]/Bioengineering/Nuclear medicine
Modulators
Position sensitive detectors
030218 nuclear medicine & medical imaging
law.invention
[SDV.IB.MN] Life Sciences [q-bio]/Bioengineering/Nuclear medicine
03 medical and health sciences
0302 clinical medicine
Optics
law
medicine
[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
Particle beam detectors
Physics
Range (particle radiation)
Particle therapy
[PHYS.PHYS.PHYS-MED-PH] Physics [physics]/Physics [physics]/Medical Physics [physics.med-ph]
business.industry
Detector
Gamma rays
Gamma ray
Solid angle
3. Good health
Beamline
[PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
030220 oncology & carcinogenesis
[PHYS.PHYS.PHYS-MED-PH]Physics [physics]/Physics [physics]/Medical Physics [physics.med-ph]
Protons
business
Subjects
Details
- Language :
- English
- ISSN :
- 00036951
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters, Applied Physics Letters, American Institute of Physics, 2017, 110 (15), pp.154102. ⟨10.1063/1.4980103⟩, Applied Physics Letters, 2017, 110 (15), pp.154102. ⟨10.1063/1.4980103⟩
- Accession number :
- edsair.doi.dedup.....8ce7ce88159a3e18323c5bb7f249b8be