ExperimentalStudy_VNwadeyi2.pdf (743.34 kB)
Download file

Experimental Study of Using a 3-D Position Sensitive CdZnTe Detector for Proton Beam Range Verification

Download (743.34 kB)
posted on 2021-03-22, 20:00 authored by Valerie NwadeyiValerie Nwadeyi, Paul maggi, Zhong He, Jerimy Polf

Position sensitive CdZnTe Compton imaging cameras are currently being studied for their use of proton beam range verification for radiotherapy applications. This work presents the use of an experimental large volume CdZnTe detector for the detection of prompt gamma rays that are emitted from proton-nuclei interaction within plastic (C2H4) targets. Two experiments were conducted where the incident angle and the dose profile of the beam were varied. The energy spectra from these experiments show that the angle at which the beam enters the target can influence the photopeak to Compton continuum ratios, resulting in more than 18% increase at 718 keV when the beam is parallel to the detector. Images of the 718 keV and 4.44 MeV characteristic prompt gamma ray emission from carbon-proton interactions are reconstructed using list-mode maximum likelihood expectation maximization (MLEM). Images from these prompt gamma emissions line up well with the expected location of the proton beam within the plastic targets.


Prompt Gamma Imaging for the in-vivo range verification during proton radiotherapy

National Cancer Institute

Find out more...


Email Address of Submitting Author

ORCID of Submitting Author


Submitting Author's Institution

University of Michigan

Submitting Author's Country

  • United States of America

Usage metrics