1.5T磁共振插入有限脉冲响应技术肾血管成像

Renal vascular angiography with interpolated finite impulse response with 1.5T MR

目的探讨1.5T采用轴位插入有限脉冲响应(IFIR)序列进行肾血管成像的可行性。方法对122例受试者进行IFIR序列扫描,在ADW4.3工作站上行最大密度投影(MIP)重建,对肾动脉各分支显示程度进行评分,并与肾动脉的信噪比(SNR)、呼吸运动伪影的有无、年龄高低等因素对比分析。结果112例(91.80%)可显示肾脏段血管,其中78例(63.93%)能清晰观察到肾脏段血管,54例(44.26%)可清晰显示到段后血管,22例(18.03%)可清晰显示到段后血管的分支。不同年龄组间血管评分不同,<60岁组及≥60岁组血管评分平均秩次为67.48及49.25(P=0.006)。呼吸运动影响肾血管评分,有无呼吸伪影组评分平均秩次分别为43.35及66.66(P=0.002)。SNR与肾血管评分无关(P=0.177)。结论1.5TMRIFIR序列用于肾脏血管成像简便、安全,可清晰显示各级肾血管。

Objective To evaluate the feasibility of renal artery angiography with interpolated finite impulse response （IR- FR） sequence on 1.5T MR. Methods A total of 122 subjects underwent MR scan with IFIR sequence. On axial image of IFIR, bilateral signal-to-noise ratio （SNR） and breath artifact of renal artery were measured and 3D maximum intensity projection （MIP） images were reconstructed on workstation ADW 4.3, and each branch was scored according to its displaying quality. Influence of SNR, age and breath artifact on the displaying of renal artery were compared and analyzed. Results Renal segmental artery could be seen in 112 subjects （91.80%）. Among them, segmental artery was showed clearly in 78 subjects （63.93%）, posvsegmental artery was showed in 54 subjects （44.26 %） and branches of post-segmental artery was showed in 22 subjects （18. 03%）. There was statistical difference of renal artery scores mean rank between ≥60 years group and 〈60 years group （49.25 vs 67.48, P=0. 006）, as well as between the group without and with breath artifact （66.66 vs 43.35, P=0. 002）. No statistical difference of SNR was found among renal artery scores from 1-5 （P=0. 177）. Conclusion IFIR sequence is simple and safe for renal artery angiography on 1.5T MR, and different grades of renal artery branch can be showed clearly,