中国医学装备Issue(12)：52-54,55,4.DOI:10.3969/J.ISSN.1672-8270.2015.12.016
点源活度对SPECT固有均匀性测试结果的影响评价
The influence of point source activity on intrinsic uniformity test of single photon emission computed tomography
任超 1霍力 1巴建涛 1王俊清 1王正华 1刘宇1
作者信息
- 1. 中国医学科学院北京协和医院核医学科 北京 100730
- 折叠
摘要
Abstract
Objective:To guide the daily quality control (QC) test, the aim of this study is to analyze the influences of various point source activities on the intrinsic uniformity test of Single Photon Emission Computed Tomography(SPECT).Methods: Siemens SPECT system with double head was used in this study. The activities of point source were ranged from 555 KBq to 20.35 MBq. Serial static images were collected (10000k counts/head for three times). Two different uniformity parameters, including integral uniformity(IU) and differential uniformity(DU), were calculated for both the central field of view(CFOV) and useful field of view(UFOV). Pearson correlation analysis was applied in statistical study to compare experimental data (mean value) with those on the basis of operation manual.Results:When the activities of point source were within 3.7 MBq(including 3.7 MBq), the intrinsic uniformity tests of two head passed smoothly and thoroughly. No correlation was found between activities and uniformities. While the point source activities were more than 3.7 MBq, failures of intrinsic uniformity test raised up with activities increasing. The activities and the data of uniformities showed significantly correlation.Conclusion: Depending on the operation manual, the point source activity can fluctuate in a certain range, which is convenient for point source preparation and passed the intrinsic uniformity test efficiently. The range should be acquired after measuring in different SPECT system and is guarantee to fulfill the daily quality control demanding.关键词
单光子发射计算机断层成像术/固有均匀性/放射性活度Key words
Single photon emission computed tomography/Intrinsic uniformity/Activity分类
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任超,霍力,巴建涛,王俊清,王正华,刘宇..点源活度对SPECT固有均匀性测试结果的影响评价[J].中国医学装备,2015,(12):52-54,55,4.
