Performance prediction of gamma electron vertex imaging (GEVI) system for interfractional range shift detection in spot scanning proton therapyopen access
- Authors
- Kim, Sung Hun; Jeong, Jong Hwi; Ku, Youngmo; Jung, Jaerin; Kim, Chan Hyeong
- Issue Date
- Jun-2022
- Publisher
- Korean Nuclear Society
- Keywords
- Beam range verification; Gamma electron vertex imaging; Prompt gamma; Proton therapy
- Citation
- Nuclear Engineering and Technology, v.54, no.6, pp.1 - 8
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- Nuclear Engineering and Technology
- Volume
- 54
- Number
- 6
- Start Page
- 1
- End Page
- 8
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/170166
- DOI
- 10.1016/j.net.2021.12.027
- ISSN
- 1738-5733
- Abstract
- The maximum dose delivery at the end of the beam range provides the main advantage of using proton therapy. The range of the proton beam, however, is subject to uncertainties, which limit the clinical benefits of proton therapy and, therefore, accurate in vivo verification of the beam range is desirable. For the beam range verification in spot scanning proton therapy, a prompt gamma detection system, called as gamma electron vertex imaging (GEVI) system, is under development and, in the present study, the performance of the GEVI system in spot scanning proton therapy was predicted with Geant4 Monte Carlo simulations in terms of shift detection sensitivity, accuracy and precision. The simulation results indicated that the GEVI system can detect the interfractional range shifts down to 1 mm shift for the cases considered in the present study. The results also showed that both the evaluated accuracy and precision were less than 1–2 mm, except for the scenarios where we consider all spots in the energy layer for a local shifting. It was very encouraging results that the accuracy and precision satisfied the smallest distal safety margin of the investigated beam energy (i.e., 4.88 mm for 134.9 MeV).
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