光梭各向同性扫描在肝脏磁共振灌注加权血管成像中的价值

The value of isotropic scanning during hepatic MR perfusion weighted angiography

目的:探讨光梭各向同性扫描在肝脏磁共振灌注加权血管成像中的应用价值。方法:选取2020年9月-2021年2月本院30例患者均实施肝脏磁共振灌注加权成像,15例患者利用动脉期多时相扫描方法行灌注成像,为常规组;15例患者利用光梭各向同性扫描方法行灌注成像,为ISO组。评估肝脏边缘锐利度、血管清晰度、形变和伪影在内的主观图像质量指标,同时比较包含信噪比、对比噪声比在内的客观图像质量指标。结果:主观评分结果显示轴面图像上ISO组图像伪影明显<常规组(P<0.05),而在肝脏边缘的锐利度、血管清晰度、形变上,两组无显著性差异(P>0.05)。重建冠状面和矢状面上ISO组的主观评分质量明显高于常规组,两组在肝脏边缘的锐利度、血管清晰度、伪影和形变上均存在显著性差异(P<0.0001)。客观评分结果显示在动脉期、门脉期两组图像SNR和CNR均存在显著性差异(P<0.05)。结论:光梭各向同性扫描应用于肝脏磁共振灌注加权成像中具有明显优势,实现了任一平面/斜面高分辨三维重建,在肝脏疾病诊断和肝脏外科手术实施中具有不可替代的优势。

Objective:To probe application value of the isotropic scanning technology during hepatic MR perfusion weighted imaging.Methods:The image data of thirty patients who were performed hepatic MR perfusion weighted imaging in our hospital from September 2020 to February 2021 were collected.15 patients which were performed with multi-arterial phase perfusion weighted imaging were set as the conventional group.15 patients which were performed with isotropic scan during hepatic MR perfusion weighted imaging were set as ISO group.The subjective image quality indicators included the sharpness of hepatic edge,the clarity of blood vessel,distortion and artifacts.The objective image quality indicators included spatial resolution,signal-to-noise ratio,and contrast-to-noise ratio.The image quality of conventional group and ISO group were compared.Results:The artifacts on axis image of isotropic group was significantly less than the control group(P<0.05).There were no significant difference in the objective image quality score including the sharpness of hepatic edges,the clarity blood vessels and distortion on axis image between the conventional group and ISO groups(P>0.05).The conventional group subjective image quality score including the sharpness of hepatic edges,clarity of blood vessels,distortion,and artifacts on the sagittal and coronal images are higher than which of ISO group(P<0.05).There are significant difference in the objective image quality score including SNR and CNR at arterial phase and venous phase between the conventional group and ISO group(P<0.05).Conclusions:The isotropic scan technology shows an obviously advantage during hepatic MR perfusion weighted imaging.It can carry out any plane high-resolution 3D reconstruction.It may be useful for hepatic disease diagnosis and hepatic surgery.