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Multi-slit prompt-gamma camera for locating of distal dose falloff in proton therapy

Multi-slit prompt-gamma camera for locating of distal dose falloff in proton therapy

Authors :
Chan Hyeong Kim
Youngmo Ku
Jong Hoon Park
Se Byeong Lee
Sung Hun Kim
Han Rim Lee
Dong Ho Shin
Jong Hwi Jeong
Source :
Nuclear Engineering and Technology, Vol 51, Iss 5, Pp 1406-1416 (2019)
Publication Year :
2019
Publisher :
Elsevier BV, 2019.

Abstract

In this research, a multi-slit prompt-gamma camera was developed to locate the distal dose falloff of the proton beam spots in spot scanning proton therapy. To see the performance of the developed camera, therapeutic proton beams were delivered to a solid plate phantom and then the prompt gammas from the phantom were measured using the camera. Our results show that the camera locates the 90% distal dose falloff (= d90%), within about 2–3 mm of error for the spots which are composed 3.8 × 108 protons or more. The measured location of d90% is not very sensitive to the irradiation depth of the proton beam (i.e., the depth of proton beam from the phantom surface toward which the camera is located). Considering the number of protons per spot for the most distal spots in typical treatment cases (i.e., 2 Gy dose divided in 2 fields), the camera can locate d90% only for a fraction of the spots depending on the treatment cases. However, the information of those spots is still valuable in that, in the multi-slit prompt-gamma camera, the distal dose falloff of the spots is located solely based on prompt gamma measurement, i.e., not referring to Monte Carlo simulation. Keywords: Proton therapy, Prompt gamma, Beam range verification, Distal dose falloff

Details

ISSN :
17385733
Volume :
51
Database :
OpenAIRE
Journal :
Nuclear Engineering and Technology
Accession number :
edsair.doi.dedup.....eb97c48f5322dc49c108cbb56eb7f23d
Full Text :
https://doi.org/10.1016/j.net.2019.03.008