Title: Cardiac electrical mechanical coupling and flash dual-source CT coronary angiography in patients with high heart rates
Abstract:Objective To assess the image quality and effective radiation dose of prospectively electrocardiogram-triggered high-pitch spiral acquisition (flash spiral mode)dual-source CT coronary angiography in ...Objective To assess the image quality and effective radiation dose of prospectively electrocardiogram-triggered high-pitch spiral acquisition (flash spiral mode)dual-source CT coronary angiography in patients with high heart rate(HR).Methods From 1321 consecutive patients,seventy patients with HR≥70 bpm (group A) and seventy patients with HR70 bpm (group B) underwent CT angiography and were prospectively included in this study.The start phase for image acquisition of the most cranial slice was selected at 20%-30% of the R-R interval for group A and at 60% of the RR interval for group B.Assessed the image quality and effective radiation dose of two group.Results (1)There were no significant differences in age,sex,BMI and scan time between the two groups.(2)Image qualities:The segments with non-diagnostic image quality occurred (i.e.score 3) had no significant difference between group A and group B (2.1% vs.1.5%,P=0.48).Non-diagnostic image quality was most often found in the RCA and LCX in both groups.(3)The estimated radiation dose was on average (1.00±0.15) mSv(0.7-1.82 mSv) in group A and (1.01±0.16)mSv (0.65-1.82 mSv) in group B.Conclusions Patients with high heart rates can be performed CTCA with high-pitch spiral acquisition mode.20%-30% of the R-R interval window for data acquisition for high-pitch dual-source CTCA may probably obtain good image quality with low doses.The highest HRs are 100 bpm with good image quality.HR variability is a great effect factor of image quality.The estimated radiation dose is about 1 mSv.Read More
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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