Nuclear Cardiology: Nuclear Cardiology:

200 Nuclear Cardiology, The BasicsFig. 14-69. Quantification of the images in Figs. 14-67 and 14-68. The circumferentialprofiles show an inferior defect that is reversible at rest. Because ofintense adjacent liver uptake, one should be concerned about the possibility ofa filtered backprojection artifact. It is conceivable that the filter suppressedimage data in the inferior wall of the heart in the presence of the hot liver.Fig. 14-70. (Top right) Rotating projection images of the same patient as in Figs.14-66–14-69. Since the first study was considered potentially artifactual,adenosine stress test was repeated with simultaneous low-level (Bruce 1) treadmillexercise. On the repeat stress images, liver uptake is markedly less comparedto that in Fig. 14-66.Fig. 14-71. (Bottom right) Reconstructed tomographic slices of the images inFig. 14-70. The stress images are of much better quality than those in Fig. 14-67.A small inferior myocardial perfusion defect is present after stress and at rest.