NEMA NU 2 Performance Tests for Scanners with Intrinsic Radioactivity

Journal of Nuclear Medicine

Michael E. Casey¹  Bernard Bendriem¹  Doug Adams¹  Tim Mulnix¹  Charles C. Watson¹  Lars Eriksson¹ 

[1] CPS Innovations, Knoxville, Tennessee CPS Innovations, Knoxville, Tennessee CPS Innovations, Knoxville, Tennessee

关键词: background;    intrinsic radioactivity;    lutetium oxyorthosilicate;    National Electrical Manufacturers Association;    NU 2;    PET;   

DOI  :  

学科分类：医学（综合）

来源: Society of Nuclear Medicine

【 摘 要 】

Performance tests on lutetium oxyorthosilicate (LSO)–based PET scanners cannot be conducted strictly according to the National Electrical Manufacturers Association (NEMA) NU 2 standards because of the presence of intrinsic radioactivity within the LSO crystal scintillator material. This background radiation gives rise mainly to random coincidence events but also to a small number of true coincidences, which cannot be eliminated from measurements on such scanners and must therefore be corrected for in the data analysis. The current NU 2 standards do not take account of these backgrounds and hence can lead to erroneous results on LSO-based machines. Nevertheless, the intent of the standards can be met with appropriate modifications to the acquisition and processing procedures. In this paper, we propose certain changes to the NEMA specifications to accommodate this class of scanners. These changes affect mainly the estimation of sensitivity, scatter, randoms, and count losses. Using these modified procedures, the NU 2 performance of LSO-based systems can accurately be measured.

【 授权许可】

Unknown