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Upgrade of gamma electron vertex imaging system for high-performance range verification in pencil beam scanning proton therapy

  • Kim, Sung Hun (Center for Proton Therapy, National Cancer Center) ;
  • Jeong, Jong Hwi (Center for Proton Therapy, National Cancer Center) ;
  • Ku, Youngmo (Department of Nuclear Engineering, Hanyang University) ;
  • Jung, Jaerin (Department of Nuclear Engineering, Hanyang University) ;
  • Cho, Sungkoo (Radiation Oncology, Samsung Medical Center) ;
  • Jo, Kwanghyun (Radiation Oncology, Samsung Medical Center) ;
  • Kim, Chan Hyeong (Department of Nuclear Engineering, Hanyang University)
  • Received : 2021.04.19
  • Accepted : 2021.09.02
  • Published : 2022.03.25

Abstract

In proton therapy, a highly conformal proton dose can be delivered to the tumor by means of the steep distal dose penumbra at the end of the beam range. The proton beam range, however, is highly sensitive to range uncertainty, which makes accurately locating the proton range in the patient difficult. In-vivo range verification is a method to manage range uncertainty, one of the promising techniques being prompt gamma imaging (PGI). In earlier studies, we proposed gamma electron vertex imaging (GEVI), and constructed a proof-of-principle system. The system successfully demonstrated the GEVI imaging principle for therapeutic proton pencil beams without scanning, but showed some limitations under clinical conditions, particularly for pencil beam scanning proton therapy. In the present study, we upgraded the GEVI system in several aspects and tested the performance improvements such as for range-shift verification in the context of line scanning proton treatment. Specifically, the system showed better performance in obtaining accurate prompt gamma (PG) distributions in the clinical environment. Furthermore, high shift-detection sensitivity and accuracy were shown under various range-shift conditions using line scanning proton beams.

Keywords

Acknowledgement

This research was supported by the National Cancer Center Grants (NCC-2110390-1), Korea.

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