呼吸导航3D B-TFE序列磁共振冠状动脉成像

Imaging Quality Evaluation of Respiratory Navigator 3D BTFE Coronary MR Angiography Techniques

目的评价呼吸导航3D B-TFE序列在冠状动脉成像中的图像质量。方法用三维(3D)B-TFE(balanced turbo fieldecho)序列,呼吸导航门控技术,心电向量(VCG)R波触发门控技术,对41例受检者进行磁共振冠状动脉造影(MRCA)检查。对图像质量进行评分,测量冠状动脉主干及其分支的显示长度,并计算成像信噪比(SNR)、对比噪声比(CNR)。结果评分≥2的病例共计38例,左主干(LM)、左前降支(LAD)、左回旋支(LCX)及右冠状动脉(RCA)的血管长度分别为15.34±6.60mm、52.50±16.37mm、50.92±21.14mm、97.38±29.16mm;SNR和CNR分别为108.86±86.11、67.77±53.14。RCA远段显示率为75%,其余节段的显示率为91.66%～100%。结论呼吸导航3D BTFE序列具有较高的图像信噪比;可在自由呼吸的情况下得到冠状动脉的影像;对冠状动脉主干的显示率较高,RCA和LCX远段显示率相对较低。

Objective To investigate the quality of coronary arteries imaging made by 3D B-TFE sequence.Methods On 41 examiner,coronary arteries were imaged using 3D B-TFE sequence with respiratory navigator trigger gate and VCG(vectorcardiogram) R peak trigger gate to grade the quality of the acquired imaging.The length of the visualized coronary arteries stem and branch was measured.The SNR(single to noise ratio) and the CNR(contrast noise ratio) on acquired imaging was analyzed.Results The scores among 38 examiners ...