High-energy photon depth of interaction calculation based on light-sharing-window method
10.7687/j.issn1003-8868.2018.05.022
- VernacularTitle:基于分光窗口法的高能光子反应深度计算
- Author:
Ming-Ming YANG
1
;
Si-Wei XIE
;
Gao-Yang YING
;
Qiu HUANG
;
Zhi-Xiang ZHAO
;
Qiong YAN
;
Zhi-Hong SU
;
Jian-Feng XU
;
Qi-Yu PENG
Author Information
1. 华中科技大学机械科学与工程学院
- Keywords:
light-sharing-window method;
high-energy photon;
depth of interaction(DOI);
position decoding;
PET;
crystal array
- From:
Chinese Medical Equipment Journal
2018;39(5):22-28,63
- CountryChina
- Language:Chinese
-
Abstract:
Objective To propose a method for high-energy photon 3D decoding of PET detector to decode reactive crystal position and calculate γ ray depth in the scintillating crystal. Methods Light transmitting windows were set between the crystal arrays, visible photon groups were guided to distribute in the photoelectric sensor array during a single event, and sensor signal intensity was regulated to realize position and depth decoding of the high-energy photon.Monte Carlo method was used to compare the designs of different light transmitting windows to determine the effects of the crystal surface treatment mode on the results. Experiments were executed for further verification. Results The experimental results had consistency with simulation ones;the signal received through the reaction crystal was always stronger than that through the adjacent, which could decode the reaction crystals; the relations between the depth of interaction (DOI) and energy differences of the photo sensors were monotonic with the changes of DOI,and thus could be used to calculate the DOI;when using single window,the DOI vs.Diff.Energy curves had two segments which were not desired for DOI measurement;crystals with rough surfaces were more desired since the qualities of their DOI vs.Diff.Energy curves were better;the dual window method had the best DOI vs.Diff.Energy curves in term of linearity.Conclusion The method can realize 3D decoding of the discrete crystal array,which improves the energy resolution of the PET system. [Chinese Medical Equipment Journal, 2018,39(5):22-28,63]
