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Single-Photon Emission Tomography with a 12-Pinhole Collimator

Bruce Hasegawa^*, Dennis Kirch, David Stern, Michael Adams, Joel Sklar, Timothy Johnson and Peter Steele

Veterans Administration Medical Center and University of Colorado Health Sciences Center, Denver, Colorado

Correspondence: For reprints contact: Dennis L. Kirch, MSEE, Veterans Administration Medical Center, Div. of Cardiology (111B), 1055 Clermont St., Denver, CO 80220.

ABSTRACT

To assess the advantages of more complete angular sampling and of more views in the tomographic reconstruction process, tomographic imaging with a 12-pinhole (12PH) collimator has been compared with 7-pinhole tomography (7PH). The 12PH system gives a 50% Increase in sensitivity but resolution degrades more rapidly with depth. The 7PH and 12PH systems provide similar accuracy of detection of lesions in a myocardial ring phantom. The 7PH images, however, demonstrated more noise and "ripple" artifacts. The 12PH system offers a larger reconstruction volume and generates fewer artifacts when the collimator is misaligned with the myocardial long-axis, thus making patient positioning less critical than with 7PH. A disadvantage is that individual views are minified by the 12PH collimator, and a 256 x 256 image matrix should be used during image acquisition to limit digital sampling errors.

FOOTNOTES

^* Current address: Dept. of Radiology, Univ. of Wisconsin Clinical Sciences Center (E3/376), Madison, WI 53792.

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