title: PET performance measurements for an LSO-based combined PET/CT scanner using the National Electrical Manufacturers Association NU 2-2001 standard.
abstract: 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.
  
  
  CONCLUSIONS
  We find that, with appropriate modifications, NU 2-2001 can be successfully applied to LSO-based scanners.
authors.affiliation: Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA. erdiy@mskcc.org
authors.forename: Yusuf E
authors.initials: YE
authors.lastname: Erdi
authors.forename: Sadek A
authors.initials: SA
authors.lastname: Nehmeh
authors.forename: Tim
authors.initials: T
authors.lastname: Mulnix
authors.forename: John L
authors.initials: JL
authors.lastname: Humm
authors.forename: Charles C
authors.initials: CC
authors.lastname: Watson
mesh_terms: D015902:Gamma Cameras / Q000592:standards*; D006801:Humans; D008187:Lutetium; D019047:Phantoms, Imaging; D011877:Radionuclide Imaging / Q000295:instrumentation / Q000592:standards; D017640:Silicates; D015898:Tomography Scanners, X-Ray Computed / Q000592:standards*; D014055:Tomography, Emission-Computed / Q000295:instrumentation* / Q000592:standards; D014057:Tomography, X-Ray Computed
chemical_list: D017640:Silicates; C477682:lutetium orthosilicate; D008187:Lutetium