Segmentation of the body and lungs from Compton scatter and photopeak window data in SPECT: A Monte-Carlo investigation
Journal Article
·
· IEEE Transactions on Medical Imaging
OSTI ID:207907
- Univ. of Massachusetts Medical Center, Worcester, MA (United States). Dept. of Nuclear Medicine
- Univ. of Lund (Sweden). Dept. of Radiation Physics
In SPECT imaging of the chest, nonuniform attenuation correction requires use of a patient specific attenuation ({mu}) map. Such a map can be obtained by estimating the regions of (1) the lungs and (2) the soft tissues and bones, and then assigning an appropriate value of attenuation coefficient ({mu}) to each region. The authors proposed a method to segment such regions from the Compton scatter and photopeak window SPECT slices of Tc-99m Sestamibi studies. The Compton scatter slices are used to segment the body outline and to estimate the regions of the lungs. Locations of the back bone and sternum are estimated from the photopeak window slices to assist in the segmentation. To investigate the accuracy of using Compton scatter slices in estimating the regions of the body and the lungs, a Monte-Carlo SPECT simulation of an anthropomorphic phantom with an activity distribution and noise characteristics similar to patient data was conducted. Energy windows of various widths were simulated for use in locating a suitable Compton scatter window for imaging. The effects of attenuation correction using a {mu} map based on segmentation were also studied.
- OSTI ID:
- 207907
- Journal Information:
- IEEE Transactions on Medical Imaging, Journal Name: IEEE Transactions on Medical Imaging Journal Issue: 1 Vol. 15; ISSN 0278-0062; ISSN ITMID4
- Country of Publication:
- United States
- Language:
- English
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