Title: Coronary artery imaging in patients with sinus tachycardia using dual-source CT:Optimal reconstruction phase and the effect of heart rate and heart rate variability on image quality
Abstract: Objective To explore the optimal reconstruction phase of coronary artery imaging in patients with sinus tachycardia (100 beat per minute, bpm) by dual-source CT coronary angiography (CTCA), and to assess the effect of average heart rate (aHR) and heart rate variability on coronary artery image quality. Methods Forty-seven patients with sinus tachycardia underwent CTCA. Best systolic and diastolic coronary arteries were reconstructed with a dedicated automatic software and then CT data was reconstructed with the R-R interval of 5%; image quality was assessed using four-score method. Coronary arteries were segmented according to the guideline of American Heart Association. The phase with optimal image quality was computed; the effect of aHR and heart rate variability on image quality was analyzed. Results aHR in the 47 patients was (110.15±7.95) bpm. The optimal reconstruction window for phase reconstruction technique was at the automatic optimal systolic phase (86%) and the 45% of R-R interval (83%) and 40% of R-R interval (83%). But there was not significant difference in image quality among 40%, 45% of R-R interval and automatic best systolic phase (P0.05). The optimal image quality of right coronary artery (RCA) was acquired at the 45% of R-R interval (95%), left anterior descending artery (LAD) at 35% (85%), left circumflex artery (LCX) at 40% (77%). aHR had no correlation with image quality of coronary angiography. Negative correlation was found between aHR and image quality of LCX (r=-0.420, P=0.003). Heart rate variability had no correlation with image quality of coronary angiography; positive correlation was found between heart rate variability and image quality of LAD (r=0.400, P=0.005). Conclusion The Optimal image quality of CTCA was acquired at the 40%-45% of R-R interval and automatic best systolic phase for patients with sinus tachycardia. Various reconstruction windows should be used for each coronary artery because of non-optimal image quality in a single reconstruction phase.aHR had no correlation with image quality of coronary angiography with DSCT; as well, heart rate variability had no correlation with average image quality of coronary angiography.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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Cited By Count: 1
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