MR无对比剂肾动脉血管成像的参数优化及其与年龄的关系

发布时间：2018-12-11 20:50

【摘要】：目的探讨利用时间—空间双重标记翻转恢复(Time-SLIP)技术进行MR无对比剂肾动脉血管成像的可行性,得出最佳反转时间(TI)值,并分析其与年龄的关系。方法将61名健康志愿者按年龄分为22~50岁组(n=32)及51~80岁组(n=29),分别于6个不同TI值(1 200、1 300、1 400、1 500、1 600、1 700ms)水平下行MR扫描。分别测量及分析肾血管—肾实质信号强度比(VKR)、肾动脉分支显示评分及肾动脉图像质量评分。结果左侧及右侧肾的VKR值均在TI值为1 500ms时最高。肾动脉分支显示评分在TI值为1 200~1 400ms水平逐渐上升,之后趋于平缓。全部受试者中,TI值为1 500ms时图像质量评分最高;22~50岁组中,TI值为1 500ms时肾动脉图像质量评分最高;51~80岁组中,TI值为1 600ms时肾动脉图像质量评分最高。22~50岁组各部分肾动脉图像质量评分均高于51~80岁组(P均0.05)。结论利用Time-SLIP技术可在不使用对比剂的情况下完成MR肾动脉成像,最佳TI值为1 500ms。年龄是影响TI值选择的重要因素之一。
[Abstract]:Objective to explore the feasibility of using time-space double-label reversal recovery (Time-SLIP) technique to perform MR renal artery angiography without contrast agent, and to obtain the best inversion time (TI) value, and to analyze its relationship with age. Methods 61 healthy volunteers were divided into two groups according to their age: 22 ~ 50 years group (n = 32) and 51 ~ 80 years old group (n = 29). MR scanning was performed at 6 different TI values (1 200 ~ 1 300 ~ 1 400 ~ 1 500 ~ 1 600 ~ 1 700ms). Renal vascular-renal parenchymal signal intensity ratio (VKR),) and renal artery image quality score were measured and analyzed respectively. Results the VKR values of left and right kidneys were highest when TI was 1 500ms. The renal artery branch showed that the TI value of 1 200 min 1 400ms increased gradually, and then tended to flatten. In all subjects, the image quality score of renal artery was the highest when TI value was 1 500ms, and the renal artery image quality score was highest when TI value was 1 500ms in 22 ~ 50 years old group. The renal artery image quality score was the highest when the TI value was 1 600ms, and the image quality score of all parts of renal artery in 22 ~ 50 years old group was higher than that in 51 ~ 80 years old group (P < 0. 05). Conclusion MR renal artery imaging can be performed without contrast medium by using Time-SLIP technique. The best TI value is 1 500 Ms. Age is one of the important factors that influence the choice of TI value.
【作者单位】：中国医科大学附属第一医院放射科;
【分类号】：R692;R816.7

【参考文献】