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目的 量化評(píng)估16層螺旋CT冠狀動(dòng)脈各分支圖像質(zhì)量,探討冠狀動(dòng)脈CT成像的臨床應(yīng)用效果.方法 采用16層螺旋CT對102例患者行回顧性心電門控冠狀動(dòng)脈成像,男60例,女42例,平均年齡(57.8±9.4)歲,平均心率(62.8±10.2)次/min.心率<60次/min(n=40)為Ⅰ組,60～70次/min(n=35)為Ⅱ組,>70次/min(n=27)為Ⅲ組.4條冠狀動(dòng)脈分支(左主干、左前降支、左回旋支、右冠狀動(dòng)脈)分別用于圖像質(zhì)量分析.掃描原始數(shù)據(jù)以間隔10%在20%～80%時(shí)相分別回顧性重建冠狀動(dòng)脈圖像,用橫斷面、曲面重建、容積再現(xiàn)等方法對冠狀動(dòng)脈顯示率評(píng)估.用曲面重建方法測量冠狀動(dòng)脈各分支長度及近段和遠(yuǎn)段對比噪聲比.結(jié)果 ①冠狀動(dòng)脈各分支平均顯示長度:左主干(10.9±3.0)mm,左前降支(130.3±29.7)mm,左回旋支(82.8±19.8)mm,右冠狀動(dòng)脈(150.5±27.5)mm;②Ⅰ組60%和70%為最佳時(shí)相圖像質(zhì)量優(yōu),Ⅱ組60%時(shí)相為最佳時(shí)相圖像質(zhì)量優(yōu),Ⅲ組RCA較優(yōu)的時(shí)相為40%,LM、LAD、LCX較優(yōu)時(shí)相為60%.③所有冠狀動(dòng)脈分支平均對比噪聲比10.9±3.2.結(jié)論 16層螺旋CT有較好質(zhì)量的冠狀動(dòng)脈圖像,心率和時(shí)相影響冠狀動(dòng)脈的成像質(zhì)量.

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