Local threshold for segmented attenuation correction of PET imaging of the thorax
- 1 August 1994
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Nuclear Science
- Vol. 41 (4) , 1532-1537
- https://doi.org/10.1109/23.322944
Abstract
A local threshold for segmented attenuation correction technique has been developed for positron emission tomography using short (2-3 minutes) post-injection transmission scans. The technique implements an optimal threshold method on localized histograms to get pseudo-anatomic segmentation on transmission images. Theoretical values of attenuation coefficients are assigned to corresponding anatomic regions. Emission images are reconstructed using attenuation correction factors computed by forward-projecting segmented transmission images. Phantoms and clinical cardiac images are studied using this technique. The technique corrects emission images with accuracy similar to the standard, pre-injection method, reduces noise in the corrected emission images, and offers the potential for increased patient throughput by enabling shorter, post-injection data acquisition.<>Keywords
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