Objective To explore the feasibility of multi-row spiral CT coronary angiography in high heart rate patients through analyzing the imaging quality.Methods 205 cases of coronary artery CT angiography(CCTA)were retrospec-tively analyzed,and the data were collected by retrospective electrocardiogram gating combined with automatic pitch-heart rate matching.They were divided into two groups according to heart rate,group A 110 cases,heart rate and＜80 bpm;Group B,95cases and heart rate ≥80 bpm.The imaging quality of selected enhanced original imaging and CPR in both groups and the CT values of right coronary artery(RCA),left main trunk(LM),left anterior descending branch(LAD)and left circum-flex(LCX)were measured,noise-signal ratio(SNR)and noise level in aortic root were counted.The relationship between pitch and imaging quality and radiation dose between the two groups was recorded and further analyzed.The observed data of both groups were statistically treated and compared.Results Reconstruct the phases were situated 66％-80％RR inter-val in 90％patients(99/1 10 cases)in A group as well as reconstruct the phases were situated 35％-49％RR interval in 75.78％patients(72/95 cases)in B group which had significant difference(P＜0.05).The imaging quality grade and sec-tion number with artifacts in RCA,LAD,left anterior descending branch and LCX hadn't all significant difference between A and B group(P＞0.05).In A and B group,noise level in aortic root were 21.99±4.05 and 22.25±3.25 respectively,noise-signal ratio were 23.11±5.60 and 22.07±5.04 respectively that hadn't all significant difference between A and B group(P＞0.05).The CT values of All coronary arteries were over 300 HU in both groups.In A group,the CT values of right coronary artery,left main trunk,left anterior descending branch and left circumflex were respectively 430.18±78.92,497.41±87.46,416.42±78.95 and 391.16±87.74 which were higher than B group(384.57±81.18,386.33±74.63,375.27±84.12 and 356.06±87.21 in order)and there was significant difference between both group(P＜0.05).The automatic pitch-heart rate matching technology was used in the two groups of image acquisition data.The auto-matic pitch-heart rate matching pitch of group A was 0.18,and the automatic pitch-heart rate matching pitch of group B was 0.16,and the pitch of the two groups was different.There was no significant difference in CTDIvol(mGy)、DLP(mGy/cm)and ED between both group(P＞0.05).Conclusion Multi-row(256 layer)spiral CT selecting smaller pitch combined with end-systole reconstruction has better effect for coronary CT angiography in high heart rate patients and the imaging quality is able to meet demand of diagnosing,which indicates that our way is feasibility and is worth promoting in clinics.
Coronary CTAHigh heart ratePhases selectingReconstruction intervalImaging qualityComparing and analyzing
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