Multidetector-row computed tomography coronary angiography: optimization of image reconstruction phase according to the heart rate.
BACKGROUND
To optimize the image reconstruction phase of multidetector-row computed tomography (MDCT) coronary angiography according to the heart rate is crucial.


RESULTS
Scan data were reconstructed for 10 different phases in 58 sequential patients who underwent 8-row cardiac MDCT. The obtained images were scored and compared in terms of motion artifacts and visibility of the vessels, and moreover, ECG record-based evaluations were added for clarification of the temporal relationships among these 10 phases. In the cases with lower heart rates (<65 beats/min), the best quality images were obtained when the end of the image reconstruction phase was positioned at the peak of the P wave. In some cases with higher heart rates (>65 beats/min), they were obtained in the late systolic period.


CONCLUSIONS
As the heart rate increased, the optimal image reconstruction phase changed from mid diastole to late systole. However, it is recommended to try to decrease the heart rate of patients before data acquisition.
Nagatani
Yukihiro
Y
Department of Radiology, Shiga University of Medical Science, Otsu, Japan. yatsushi@belle.shiga-med.ac.jp
Takahashi
Masashi
M
Takazakura
Ryutaro
R
Nitta
Norihisa
N
Murata
Kiyoshi
K
Ushio
Noritoshi
N
Matsuo
Shinro
S
Yamamoto
Takashi
T
Horie
Minoru
M
D000368:Aged; D000369:Aged, 80 and over; D017023:Coronary Angiography / Q000379:methods*; D003331:Coronary Vessels / Q000473:pathology / Q000502:physiology; D004562:Electrocardiography; D005260:Female; D006339:Heart Rate; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012189:Retrospective Studies; D013599:Systole / Q000502:physiology; D036542:Tomography, Spiral Computed / Q000379:methods*