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PET performance measurements for an LSO-based combined PET/CT scanner using the National Electrical Manufacturers
Yusuf E Erdi1, Sadek A Nehmeh, Tim Mulnix
1Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA. erdiy@mskcc.org
Unlabelled:
Results of performance measurements for a lutetium oxyorthosilicate (LSO)-based PET/CT scanner using new National Electrical Manufacturers Association (NEMA) NU 2-2001 standards are reported.
Methods:
Performance measurements following the NU 2-2001 standards were performed on an LSO-based PET/CT scanner. In addition, issues associated with the application of the NEMA standard to LSO-based tomographs in the presence of intrinsic radiation are discussed.
Results:
We report on some difficulties experienced in following the suggested NEMA measurement techniques and describe alternative approaches. Measurements with the new standard (as compared with NU-1994) incorporate the effects of activity outside the scanner and facilitate measurements of the entire axial field of view. Realistic clinical conditions are also simulated in image quality measurements of a torso phantom.
Conclusion:
We find that, with appropriate modifications, NU 2-2001 can be successfully applied to LSO-based scanners.
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