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FDG-PET/CT Technical Committee

FDG-PET/CT Technical Committee. Quality Control Subcommittee. Goals. Bridge the gap between PET/CT scanner acceptance/qualification/certification and routine (daily) quality control Summarize methods and parameters for evaluating daily PET and CT QC on each vendor’s PET/CT scanner

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FDG-PET/CT Technical Committee

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  1. FDG-PET/CT Technical Committee Quality Control Subcommittee

  2. Goals • Bridge the gap between PET/CT scanner acceptance/qualification/certification and routine (daily) quality control • Summarize methods and parameters for evaluating daily PET and CT QC on each vendor’s PET/CT scanner • Long term goal: Establish common standards for recording and distributing QC parameters for individual patient scans (e.g. extended DICOM tags)

  3. Process • Identify the daily quality control tests that are performed on each vendor’s PET/CT scanners • Specify the range of acceptable parameters for each test as recommended by the vendor • Describe the methods for obtaining QC parameters and the output format for each vendor • Ideally, develop standard for daily QC output that could be exported with individual patient scan, e.g. extended DICOM tags or standard file format (CSV, XML)

  4. CT Quality Control • Siemens – automated test (pass/fail) • Check HU value of water. • Check pixel noise • Check tube voltages • GE – manual test with acceptable range • Check mean CT value of water (range: 0 ±3 HU) in 3 ROIs of uniform section. • Check variance of water (range: 3 ±0.4) in 3 ROIs of uniform section

  5. Siemens PET Quality Control • Ge-68 cylinder compared to normalization standard • Visually inspect sinograms and fansums. • If a sinogram shows a dark or bright streak or a “fansum” block is not uniform, notify physicist • If Chi-square > 2.5, notify physicist. (Original limit, adopted as DFCI threshold.) • If Chi-square > 10, call Service. Notify physicist

  6. GE PET Quality Control • Ge-68 pin source compare daily tests to baseline with color coded results (green/yellow/red) • Coincidence mean (sensitivity test: Average of coincidences for all crystals) • Coincidence variance • Singles mean (Average of singles for all crystals). • Singles variance • Mean deadtime (Average deadtime of all blocks). • Timing mean (Average timing adjustment of all crystals) • Energy shift (Average difference in energy peak location)

  7. QC Output formats • Mostly based on visual display • Siemens has some files available in html format on local folder • GE results can be printed as postscript

  8. Resources Needed • Information about Philips Daily QC from end users and vendor • Additional clarifications from GE and Siemens • Feedback from RSNA QIBA members • Potential interactions with DICOM working group to discuss inclusion of QC results

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