57-year-old man who underwent coronary CTA using two-breath-hold subtraction technique to assess patency of coronary artery stent. (IMAGE)

American Roentgen Ray Society

57-year-old man who underwent coronary CTA using two-breath-hold subtraction technique to assess patency of coronary artery stent.

Caption

A. Conventional HIR image and B. conventional DLR image show blurred appearance of proximal aspect of stent (arrow). C. Subtraction HIR image and D. subtraction DLR image show discrete region of hypoattenuation at proximal aspect of stent (arrow). Both readers provided a diagnosis of in-stent restenosis only for subtraction HIR and subtraction DLR. Diagnostic confidence score for the four methods for reader 1 was 2, 2, 3, and 4, respectively, and for reader 2 was 1, 2, 3, and 3, respectively. Patient subsequently underwent invasive catheter angiography. Fluoroscopic imagines obtained (E) before and (F) after contrast media injection demonstrate in-stent restenosis of proximal aspect of stent (arrow).

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