【摘要】：目的探討多時相前瞻性冠狀動脈CTA顯示竇性心動過速患者各支冠狀動脈的最佳時相,以提高前瞻性冠狀動脈CTA在竇性心動過速患者中的應(yīng)用價值。方法應(yīng)用Flex Padding技術(shù)對46例臨床懷疑冠心病的竇性心動過速患者行多時相前瞻性冠狀動脈CTA檢查。數(shù)據(jù)采集中心時相設(shè)為40%,以相對時相40%重組圖像后,在180~320 ms間期內(nèi)再以10 ms的間隔重組15個絕對時相。選擇顯示各支冠狀動脈的最佳時相并進行后處理。分析直徑≥1.5 mm的冠狀動脈節(jié)段的圖像質(zhì)量(1~4分),比較單時相和多時相重組的圖像質(zhì)量,并記錄輻射劑量。結(jié)果 46例竇性心動過速患者的右冠狀動脈(RCA)、左前降支(LAD)、左回旋支(LCX)最佳重組時相不一致。71.7%的RCA最佳重組時相位于280~300 ms;52.2%的LAD最佳重組時相位于210~230 ms,82.6%的LAD最佳重組時相位于200~250 ms;63.1%的LCX最佳重組時相位于240~260 ms。40%的單時相重組圖像質(zhì)量評分平均為2.81±0.62,合格率為57.6%;經(jīng)過多時相重組后,圖像質(zhì)量評分平均達到3.57±0.55,合格圖像達到92.6%。單時相與多時相重組的RCA、LAD、LCX圖像質(zhì)量評分存在統(tǒng)計學差異(P0.05)。平均有效輻射劑量(ED)為(2.46±0.55)m Sv。結(jié)論竇性心動過速患者RCA、LAD、LCX的最佳重組時相不一定相同,單時相重組難以獲得滿意的圖像,多時相重組可以提高竇性心動過速患者前瞻性冠狀動脈CTA的圖像質(zhì)量,同時顯著降低輻射劑量。
[Abstract]:Objective to investigate the optimal time phase of multiphase prospective coronary CTA in displaying coronary arteries in patients with sinus tachycardia, and to improve the value of prospective coronary CTA in sinus tachycardia. Methods 46 patients with sinus tachycardia suspected of coronary heart disease were examined with multiphase prospective coronary CTA with Flex Padding technique. The time of data acquisition center was set to 40%. After the image was reconstructed with 40% relative phase, 15 absolute phases were reconstructed at an interval of 10 ms within 180 ~ 320 ms interval. Select the optimal phase for displaying each coronary artery and conduct post-processing. The image quality of coronary artery segment with diameter 鈮，

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