title: Optimal Scan Time for Single-Phase Myocardial Computed Tomography Perfusion to Detect Myocardial Ischemia　- Derivation Cohort From Dynamic Myocardial Computed Tomography Perfusion.
abstract: 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.
  
  
  
  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 -2 s to 8 s 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 2-6 s from Tmax in the ascending aorta (median 86%, range 84-87%) was comparable to that of dynamic CTP.
  
  
  
  The optimal scan time for detecting myocardial ischemia with single-phase CTP was at 2-6 s from Tmax in the ascending aorta. (Circ J 2016; 80: 2506-2512).
authors: Department of Radiology, Ehime University Graduate School of Medicine.
authors: Yuki
authors: Y
authors: Tanabe
authors: Teruhito
authors: T
authors: Kido
authors: Akira
authors: A
authors: Kurata
authors: Teruyoshi
authors: T
authors: Uetani
authors: Naoki
authors: N
authors: Fukuyama
authors: Takahiro
authors: T
authors: Yokoi
authors: Hikaru
authors: H
authors: Nishiyama
authors: Tomoyuki
authors: T
authors: Kido
authors: Masao
authors: M
authors: Miyagawa
authors: Teruhito
authors: T
authors: Mochizuki
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000000981:diagnostic imaging* / Q000503:physiopathology; D009206:Myocardium; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed