Reduction of truncation artifacts in fan beam transmission by using parallel beam emission data
- Univ. of Massachusetts Medical Center, Worcester, MA (United States)
- Univ. of Chicago, IL (United States). Dept. of Radiology
- Yale Univ., New Haven, CT (United States). Dept. of Psychiatry
Transmission imaging has been demonstrated to be a promising technique to provide a patient specific attenuation map for attenuation correction of SPECT cardiac perfusion images. The authors describe a method which uses the measurement of both photopeak and Compton scatter energy window images from a parallel beam collimation to augment the truncated attenuation map reconstruction in a fan beam transmission system. The method first estimates the body and lung outlines from the reconstructed emission data and truncated attenuation map. Based on the outline information, an assigned attenuation map is created and reprojected to estimate the missed projection data, which are then combined with the truncated projection data for the set of complete data without truncation. Finally, a reconstruction using the combined complete data is performed to obtain the attenuation map with no truncation. The authors demonstrate that this method can significantly reduce the truncation artifacts in two phantom studies and one patient study. When some portion of the heart walls stays outside the densely sampled region (defined as the region of the object that has no truncation in any projection angle), the attenuation map estimated from this method can more effectively correct for the attenuation in the emission data than the truncated attenuation map.
- OSTI ID:
- 148083
- Report Number(s):
- CONF-941061--
- Journal Information:
- IEEE Transactions on Nuclear Science, Journal Name: IEEE Transactions on Nuclear Science Journal Issue: 4Pt1 Vol. 42; ISSN 0018-9499; ISSN IETNAE
- Country of Publication:
- United States
- Language:
- English
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