Evaluation of a pinhole collimator for I-131 SPECT head imaging
- Duke Univ. Medical Center, Durham, NC (United States). Dept. of Radiology
The performance of a pinhole collimator for I-131 SPECT of the head was evaluated. The evaluation included planar and SPECT spatial resolution, sensitivity in air and in water, septal penetration, reconstructed image quality, and activity quantitation within a simple phantom that models tumor uptake in the head. The pinhole collimator was compared to medium and high energy parallel hole collimators. The pinhole collimator demonstrated improved resolution/sensitivity trade-off compared with the parallel hole collimators over the range of distances relevant to head imaging. In planar point source images the pinhole collimator showed reduced penetration effects although in reconstructed images penetration effects were not apparent for either pinhole or high energy parallel hole collimators. Comparable activity quantitation accuracy was observed with all collimators. The accuracy was dependent on the segmentation threshold and calibration procedure. These results indicate that the pinhole collimator can provide improved performance over conventional parallel hole collimators for I-131 imaging in the head.
- DOE Contract Number:
- FG05-89ER60894
- OSTI ID:
- 379762
- Report Number(s):
- CONF-951073-; ISSN 0018-9499; TRN: 96:025268
- Journal Information:
- IEEE Transactions on Nuclear Science, Vol. 43, Issue 4Pt1; Conference: IEEE nuclear science symposium and medical imaging conference, San Francisco, CA (United States), 21-28 Oct 1995; Other Information: PBD: Aug 1996
- Country of Publication:
- United States
- Language:
- English
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