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METHOD AND APPARATUS FOR SCATTER CORRECTION IN POSITRON EMISSION TOMOGRAPHY (PET) IMAGING BY PERFORMING A SHORT PET SCAN IN AN EXTENDED REGION TO ESTIMATE SCATTER COMING FROM OUTSIDE OF THE FIELD OF VIEW (FOV)
METHOD AND APPARATUS FOR SCATTER CORRECTION IN POSITRON EMISSION TOMOGRAPHY (PET) IMAGING BY PERFORMING A SHORT PET SCAN IN AN EXTENDED REGION TO ESTIMATE SCATTER COMING FROM OUTSIDE OF THE FIELD OF VIEW (FOV)
A method and apparatus is provided to correct for scatter in a positron emission tomography (PET) scanner, the scatter coming from both within and without a field of view (FOV) for true coincidences. For a region of interest (ROI), the outside-the-FOV scatter correction are based on attenuation maps and activity distributions estimated from short PET scans of extended regions adjacent to the ROI. Further, in a PET/CT scanner, these short PET scans can be accompanied by low-dose X-ray computed tomography (CT) scans in the extended regions. The use of short PET scans, rather than full PET scans, provides sufficient accuracy for outside-the-FOV scatter corrections with the advantages of a lower radiation dose (e.g., low-dose CT) and requiring less time. In the absence of low-dose CT scans, an atlas of attenuation maps or a joint-estimation method can be used to estimate the attenuation maps for the extended regions.
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