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Biplanar Cardiac Blood-Pool Tomography

Veterans Administration Wadsworth Medical Center and University of California at Los Angeles, Los Angeles, California

Correspondence: For reprints contact: Dr. Stuart G. Mirell (691/115), Nuclear Medicine Service, VA Wadsworth Medical Center, Los Angeles, CA 90073.

ABSTRACT

Dynamic transverse axial wall tomograms of the left ventricle (LV) are reconstructed by a new technique from anterior and LAO views acquired with a conventional scintillation camera imaging the distribution of in-vivo Tc-99m-labeled red blood cells. By confining reconstruction to the singular contiguous uniform concentration of activity in the LV, the requisite angular samplings for a given level of accuracy are substantially reduced in this restricted form of emission computed tomography (ECT).

Static phantom studies using a series of volumes having various cross-sectional dimensions demonstrate tomographic edge reconstruction with 12% rms radial error. The dynamic cardiac ECT is demonstrated in a series of representative patient studies by reconstruction of wall tomograms in the end-diastolic and end-systolic phases of the 28-frame cardiac cycle. In contrast to the conventional dual multiframe projection views, the motion tomograms derived from the reconstructions clearly show the complete three-dimensional perspective of wall displacement.