Conditions for the determination of intrinsic uniformity and intrinsic spatial linearity of SPECT
10.13491/j.issn.1004-714X.2023.06.012
- VernacularTitle:SPECT设备固有均匀性和固有空间线性检测条件的探讨
- Author:
Pei YU
1
;
Hui LIU
1
;
Ying SONG
1
;
Xiaoliang LI
1
;
Jinsheng CHENG
1
;
Quanfu SUN
1
Author Information
1. National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088 China.
- Publication Type:OriginalArticles
- Keywords:
SPECT;
Intrinsic uniformity;
Intrinsic spatial linearity;
Quality control
- From:
Chinese Journal of Radiological Health
2023;32(6):661-667
- CountryChina
- Language:Chinese
-
Abstract:
Objective To address the absence of matrix specified for the determination of intrinsic uniformity in the current standard, and to investigate the effect of source distances on intrinsic spatial linearity, the intrinsic uniformity and intrinsic spatial linearity of 16 probes in eight SPECT devices were measured and analyzed with different matrices and source distances, in order to determine the optimal measurement conditions. Methods According to the standard Specification for Testing of Quality Control in Gamma Cameras and Single Photon Emission Computed Tomograph (SPECT) (WS 523—2019), the intrinsic uniformity was measured using 64 × 64 and 256 × 256 matrices and the intrinsic spatial linearity was measured using of 1.7 and 3 m source distances. Results When intrinsic uniformity was measured with the 64 × 64 matrix, more than 50% of the probes showed lower values. When intrinsic spatial linearity was measured with the 3 m source distance, more probes showed lower values. Conclusion The 64 × 64 matrix is recommended for the determination of intrinsic uniformity and a source distance of ＞5 FOV is recommended for the measurement of intrinsic spatial linearity.
