title: Influence of the motion correction algorithm on the quality and interpretability of images of single-source 64-detector coronary CT angiography among patients grouped by heart rate.
abstract: OBJECTIVE
  We retrospectively investigated the effect of the motion correction algorithm (MCA) on image quality and interpretability by heart rate (HR) in coronary CT angiography (CCTA).
  
  
  METHODS
  For 105 patients (6 HR groups) undergoing CCTA, 2 readers independently graded the image quality of the 4 major coronary arteries reconstructed with and without MCA at diastole with HR ≤64 bpm and at systole and diastole ≥65 bpm using a 5-point scale. For each HR group and cardiac phase, we compared per-vessel and per-segment image quality using Wilcoxon signed rank test and percentages of interpretable image quality (scores 3-5) among without MCA at diastole with HR ≤64 bpm, as a reference, with MCA at diastole ≤69 bpm and at systole 70-79 bpm using the chi-square test.
  
  
  RESULTS
  The motion correction algorithm reconstruction provided similar or better image quality and interpretability in all groups, with 96-100 % per-vessel (P = 0.008 for the right coronary artery; otherwise, P > 0.05) and 99 % per-segment interpretable image quality (P = 0.0002) at diastole with HR ≤69 bpm and at systole 70-79 bpm compared to the reference (88-100 and 97 %, respectively).
  
  
  CONCLUSIONS
  MCA reconstruction preserved image quality and interpretability of CCTA with HR ≤79 bpm.
authors.affiliation: Department of Radiology, Tokyo Women's Medical University Medical Center East, 2-1-10 Nishiogu, Arakawa-Ku, Tokyo, 116-8567, Japan, machira@dnh.twmu.ac.jp.
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Machida
authors.forename: Xiao-Zhu
authors.initials: XZ
authors.lastname: Lin
authors.forename: Rika
authors.initials: R
authors.lastname: Fukui
authors.forename: Yun
authors.initials: Y
authors.lastname: Shen
authors.forename: Shigeru
authors.initials: S
authors.lastname: Suzuki
authors.forename: Isao
authors.initials: I
authors.lastname: Tanaka
authors.forename: Takuya
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Etsuko
authors.initials: E
authors.lastname: Tate
authors.forename: Eiko
authors.initials: E
authors.lastname: Ueno
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D016477:Artifacts; D017023:Coronary Angiography / Q000379:methods*; D003324:Coronary Artery Disease / Q000000981:diagnostic imaging* / Q000503:physiopathology; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009038:Motion; D015588:Observer Variation; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000379:methods*; D055815:Young Adult