本文選題：冠狀動脈成像 + 體層攝影術(shù)�。� 參考：《中國醫(yī)學計算機成像雜志》2015年06期

【摘要】：目的:探討320排CT冠狀動脈造影中調(diào)整臨界心率采集方案后的圖像質(zhì)量及輻射劑量分析。方法:選取屏氣訓練時心率為66~68次/分患者40例,80~82次/分患者10例。66~68次/分心率系統(tǒng)自動設(shè)定的采集方案為2個beat,RR間期30%~80%時相(對照組B1),方案修改為1個beat,RR間期70%~80%時相(研究組A1)。80~82次/分心率方案由3個beat采集,RR間期30%~80%時相(對照組B2)修改為2個beat采集,RR間期30%~80%時相(研究組A2)。A1、A2組輻射劑量值由CT機自動計算得出,B1、B2組輻射劑量值以A1、A2組相同曝光參數(shù)輸入CT機后模擬獲得。分析A1、A2組圖像質(zhì)量及A1、A2與B1、B2組輻射劑量。結(jié)果:A1、A2組可評估和不可評估冠狀動脈節(jié)段分別為96.47%(579/600)、3.53%(21/600),及95.36%(143/150)、4.31%(17/150)。在可評估冠狀動脈節(jié)段中,A1組的1分、2分、3分及4分圖像分別占98.82%(572/579)、0.9%(5/579)、0.28%(2/579)及0,A2組的1分、2分、3分及4分圖像分別占96.86%(138/143)、1.2%(2/143)、1.94%(3/143)及0。A1、A2組平均輻射劑量為(2.36±0.21)m Sv、(4.36±0.81)m Sv。B1、B2組平均輻射劑量為(4.31±0.5)m Sv、(6.35±1.81)m Sv。A組和B組的平均輻射劑量差異有明顯統(tǒng)計學意義(P0.001)。結(jié)論:基于320排CT冠狀動脈造影掃描中,心率有不同程度下降的基礎(chǔ),優(yōu)化臨界心率采集方案,能保證冠狀動脈圖像的診斷需求,同時能有效降低患者吸收劑量,值得推廣。
[Abstract]:Objective: to investigate the image quality and radiation dose analysis of 320-slice CT coronary angiography after adjusting critical heart rate acquisition. Methods: 40 patients with heart rate of 660.68 beats / min during breath holding training were selected. 10 patients (10 patients, 10 patients) and 10 patients with heart rate system (HRS) were automatically set up as two batter RR intervals of 30 ~ 80 hours (control group B1, modified to 1 Beat RR interval). The heart rate scheme was revised from three beat acquisition RR intervals (control group B2) to two beat acquisition RR intervals from 30 to 80 timescences (study group A _ (2) 路A _ (1) A _ (2) group radiation dose values were calculated by CT machine automatically to get the radiation of B _ (1) B _ (2) group (A _ (2) + A _ (1) A _ (2) A _ (1) A _ 2 group radiation dose values were calculated automatically by CT machine. The dose values were simulated with A _ 1 A _ 2 group after the same exposure parameters were inputted into CT machine. The image quality of A 1 A 2 group and radiation dose of A 1 A 2 and B 1 B 2 group were analyzed. Results in the 2 groups, there were 96.4747 / 600 / 579 / 300 / 3.53 and 95.3636 / 143 / 150 / 4.31 / 150, respectively, in the assessable and unassessable segments of the coronary artery (n = 96.479 / 600 / 3.53) and 95.3636 / 153 / 150 / 4.31 / 150 / 50 respectively. In the assessable coronary artery segment, the images of 1, 2, 3 and 4 points in A1 group were 98.822 / 572 / 579 / 0.9 and 0.28 / 2 / 579 in group A 2, respectively, and in group A 2, 2, 3 and 4 in 96. 8686 / 13883 / 1 / 1 / 2 / 1 / 2 / 1 / 1 / 1 / 1 / 1 / 1 / 1 of 1.94 / 143) and 0.A1A\ + A\ + 1 / A\ + A\ + 1 / A\% A\ + A\ {1}\ {1}\} 2\%? There was significant difference in average radiation dose between group B and group B (P 0.001). Conclusion: based on 320 slice CT coronary angiography, the heart rate is decreased in varying degrees. Optimizing the critical heart rate acquisition scheme can ensure the diagnostic requirements of coronary artery images, and can effectively reduce the absorbed dose of patients, which is worth popularizing.
【作者單位】： 浙江省麗水市人民醫(yī)院放射科;
【分類號】：R816.2

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