Introduction: While the functional data of gated SPECT is valuable, its collection should not compromise the perfusion data. Failure to detect patient motion or gating errors may result in the generation of a perfusion artefact. This possibility was thought to be more likely when the perfusion data was generated by summation of the reconstructed gated slices. Methods: This study was a retrospective cross sectional study of 35 patients undergoing gated myocardial perfusion SPECT. The rotating cinematic display and sinograms for the gated and ungated datasets were visually assessed for the presence or absence of patient motion and/or gating errors. In three normal studies, a variety of motions were artificially introduced to produce 18 studies for random evaluation with 12 motion free studies. Results: Only 51.1% and 34.9% of studies identified on ungated data as having gating errors and patient motions respectively demonstrated a corresponding finding on the gated data. Motion correction software effectively corrected for patient motion in 80% of the ungated data sets and 0% of the gated data sets. In detecting introduced motion, ungated data provided an accuracy of 100% compared to just 80% for the gated data. The ROC analysis provided evidence that visual assessment of the ungated sinogram is preferable to the gated sinogram for detecting patient motion. Conclusion: Producing the ungated perfusion data set for qualitative assessment from a summation of previously reconstructed gated slices means routine post acquisition quality assurance is performed on a single count deficient gate interval. All gated myocardial perfusion SPECT studies should be ungated to ensure the efficacy of post acquisition quality control.
|Number of pages||29|
|Journal||The Internet Journal of Cardiology|
|Publication status||Published - 2007|