【摘要】：目的探討多時(shí)相前瞻性冠狀動(dòng)脈CTA顯示竇性心動(dòng)過速患者各支冠狀動(dòng)脈的最佳時(shí)相,以提高前瞻性冠狀動(dòng)脈CTA在竇性心動(dòng)過速患者中的應(yīng)用價(jià)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(dòng)過速患者行多時(shí)相前瞻性冠狀動(dòng)脈CTA檢查。數(shù)據(jù)采集中心時(shí)相設(shè)為40%,以相對時(shí)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(gè)絕對時(shí)相。選擇顯示各支冠狀動(dòng)脈的最佳時(shí)相并進(jìn)行后處理。分析直徑≥1.5 mm的冠狀動(dòng)脈節(jié)段的圖像質(zhì)量(1~4分),比較單時(shí)相和多時(shí)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(dòng)過速患者的右冠狀動(dòng)脈(RCA)、左前降支(LAD)、左回旋支(LCX)最佳重組時(shí)相不一致。71.7%的RCA最佳重組時(shí)相位于280~300 ms;52.2%的LAD最佳重組時(shí)相位于210~230 ms,82.6%的LAD最佳重組時(shí)相位于200~250 ms;63.1%的LCX最佳重組時(shí)相位于240~260 ms。40%的單時(shí)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(shí)相重組后,圖像質(zhì)量評分平均達(dá)到3.57±0.55,合格圖像達(dá)到92.6%。單時(shí)相與多時(shí)相重組的RCA、LAD、LCX圖像質(zhì)量評分存在統(tǒng)計(jì)學(xué)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(dòng)過速患者RCA、LAD、LCX的最佳重組時(shí)相不一定相同,單時(shí)相重組難以獲得滿意的圖像,多時(shí)相重組可以提高竇性心動(dòng)過速患者前瞻性冠狀動(dòng)脈CTA的圖像質(zhì)量,同時(shí)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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