【摘要】 目的:探讨磁共振三维平衡式快速场梯度回波(B-TFE)技术非对比剂血管成像在肾动脉成像中的临床应用价值。方法:选择17例临床怀疑有肾动脉狭窄的患者行B-TFE和CE-MRA检查;B-TFE组并行采集加速因子取值为1和2。B-TFE组在横轴面图像上测量双侧肾动脉在不同加速因子时的信号噪声比(SNR)、肾动脉与肾周脂肪的对比噪声比(CNR),CE-MRA组在冠状面图像上分别测量肾动脉的SNR和CNR。所有原始数据经三维MIP重组后由两位放射科医师对肾动脉三维图像质量、肾动脉狭窄程度、肾动脉分支显示及肾静脉伪影等情况进行评分。测量数据和图像评分进行统计学处理。结果:B-TFE组加速因子为1时图像的SNR为118.0±25.1(左)和105.9±29.1(右),CNR为103.7±33.5(左)和93.1±26.5(右);B-TFE组加速因子为2时SNR为93.5±23.1(左)和81.5±31.7(右),CNR为83.1±34.5(左)和69.8±28.8(右)。CE-MRA组肾动脉的SNR为103.8±31.5(左)和93.1±40.8(右),CNR为88.7±30.1(左)和79.7±38.6(右)。组内和组间SNR及CNR差异均无统计学意义(P>0.05)。B-TFE图像上肾动脉分支的显示情况好、肾静脉伪影较CE-MRA小,2组间肾动脉三维图像质量、狭窄程度的显示无明显差异。结论:3DB-TFE肾动脉成像技术具有较高的图像信噪比和对比噪声比,可以作为一种新的无创性磁共振血管成像技术应用于肾动脉成像。更多还原

【Abstract】 Objective:To study the clinical application and value of 3D B-TFE non-enhanced MR angiography technique in renal artery imaging.Methods:3D B-TFE non-enhanced MR angiography (MRA) and contrast enhanced MRA (CE-MRA) were performed in 17 patients with suspected renal artery stenosis.The values for 3D B-TFE sense accelerated factor were 1/2.The signal-noise ratio (SNR) with different accelerated factors of bilateral renal arteries on axial plane images,contrast-noise ratio (CNR) of renal arteries and peri-renal fat were measured.Also the SNR,CNR of renal arteries on coronal plane of CE-MRA were measured respectively.All of the raw data were post-processed with 3D MIP technique,and the 3D image quality,degree of renal artery narrowing,demonstration of the branches of renal arteries and artifact of renal vein were evaluated by two radiologists.Statistical analysis of the measured data and image scores were performed.Results:When the 3D B-TFE accelerated factor was 1,the SNR were 118.0±25.1 (left renal artery,LRA)、105.9±29.1 (right renal artery,RRA);and the CNR were 103.7±33.5 (LRA)、93.1±26.5 (RRA) respectively.When the B-TFE accelerated factor was 2,the SNR were 118.0±25.1 (LRA)、105.9±29.1 (RRA);and the CNR were 103.7±33.5 (LRA)、93.1±26.5 (RRA) respectively.Of the CE-MRA group,the SNR of renal arteries were 103.8±31.5 (LRA) and 93.1±40.8 (RRA) respectively;the CNR were 7±30.1 (LRA)、79.7±38.6 (RRA) respectively.No statistic differences were existed in SNR as well as CNR within the same group and between different groups (P>0.05).Demonstration of the renal artery branches and renal vein artifact on B-TFE group were less than that of CE-MRA group.No statistic differences were showed on the 3D image quality and displaying the degree of renal artery narrowing.Conclusions:3D B-TFE technique of the renal artery imaging showed high SNR and CNR,which can be used as a new non-invasive MRA technique for renal artery imaging.更多还原