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Optimal scan time for single-phase myocardial computed tomography perfusion to detect myocardial ischemia

Publication
Philips CT Clinical Science Philips Healthcare • USA

Tanabe Y, Kido T, Kurata A, Uetani T, Fukuyama N, Yokoi T, Nishiyama H, Kido T, Miyagawa M, Mochizuki T.

* This article originally appeared in the November 2016 edition of Circulation Journal.
Background
Single-phase myocardial computed tomography perfusion (CTP) is useful for detecting myocardial ischemia, but determining the optimal scan time is difficult. The present study evaluated this by analyzing dynamic CTP data.

Methods and Results
We retrospectively selected 32 patients, all of whom had undergone stress dynamic CTP and magnetic resonance myocardial perfusion imaging (MR-MPI). Myocardial ischemia was assessed by MR-MPI using the 16-segment model. Whole-heart dynamic CTP data were acquired for 30 consecutive heartbeats without spatial or temporal gaps using a wide-detector CT, and redistributed into 11 series of single-phase CTP acquired from –2s to 8s from the time of maximal enhancement (Tmax) in the ascending aorta. Single-phase CTP images were visually assessed at the segment level, and diagnostic performance of single-phase CTP images for detecting myocardial ischemia was compared with dynamic CTP. Of 512 segments, 177 segments (35%) were diagnosed as ischemic by MR-MPI. The diagnostic accuracy of single-phase CTP acquired at 2–6s from Tmax in the ascending aorta (median 86%, range 84–87%) was comparable to that of dynamic CTP.

Conclusions
The optimal scan time for detecting myocardial ischemia with single-phase CTP was at 2–6s from Tmax in the ascending aorta.
For more information about this publication, check out the PubMed listing for this article.


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Publication
iCT
aorta, Cardiac, LAD, myocardial perfusion, retrospective, stenosis, stress test, Vascular
 

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