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Figure 9 First-pass, adenosine-augmented multidetector computed tomography (MDCT) myocardial perfusion imaging in a patient referred for invasive angiography after single-photon emission computed tomography showed a fixed perfusion deficit in the inferior and inferolateral territories. Panels A and C demonstrate an inferior and inferolateral subendocardial perfusion deficit in the mid and distal left ventricle, respectively (arrows). Using semi-automated function/perfusion software, myocardium meeting the perfusion deficit signal density threshold of one standard deviation below the remote myocardial signal density is designated in blue in panels B and D. Invasive angiography shows a chronically occluded distal right coronary artery with left to right collaterals filling the posterior descending (arrows) and posterolateral branches (E). (F) 17-segment polar plot of MDCT-derived myocardial signal densities. Note the hypoperfused inferior and inferolateral regions displayed in blue.
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