The National Electrical Manufacturers Association (NEMA) published NEMA NU 1-2012 Performance Measurements of Gamma Cameras.
NEMA NU 1 establishes definitions, quantitative
measurements of performance characteristics, and reporting techniques for the specification of various gamma camera parameters. Amendments include:
Intrinsic count rate performance in air. Amended to include details for an alternative method called the “copper plates method.”
- Detectors. Amended to include very high count rate performance (i.e., low dead-time losses, typical of pixelated detectors) instead of reporting observed count rate at maximum and 20% loss. Alternatively, the maximum count rate tested and percentage count loss at that rate may be reported.
- Intrinsic energy resolution. Amended to allow an isotope other than Co-57 to determine the keV per channel calibration factor and intrinsic flood field uniformity was amended for clarity and to include measurements of defective pixels and pixel clusters for discrete pixel detectors. Additionally, the term “defective pixel” was added to the list of defined terms.
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NEMA is the association of electrical equipment and medical imaging manufacturers, founded in 1926 and headquartered in Arlington, Virginia. Its 400-plus member companies manufacture a diverse set of products including power transmission and distribution equipment, lighting systems, factory automation and control systems, and medical diagnostic imaging systems. Total U.S. shipments for electroindustry products exceeds $100 billion annually.
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