比较基于屏气梯度和自旋回波(BH-GRASE)技术的3DMRU与常规3D呼吸触发FSE(RT-FSE)序列在尿路扩张患者中的性能。
我们前瞻性纳入了90例尿道扩张患者,这些患者在3T时同时接受了3DBH-GRASE和RT-FSEMRU。记录两个MRU序列的采集时间。三名读者对协议视而不见,使用五点量表审查了图像质量,并评估了与尿路扩张相关的诊断性能。定量测量泌尿道与邻近区域之间的相对对比度(CR)。
BH-GRASEMRU采集时间为14.8s,RT-FSEMRU采集时间为213.6±52.2s。定性图像分析证明了两种MRU协议之间的显着等效性。3DBH-GRASEMRU比RT-FSEMRU更好地描绘了双侧肾盏(p<0.05)。与RT-FSEMRU相比,BH-GRASEMRU的尿路CR值较低(p<0.05)。BH-GRASE和RT-FSEMRU在尿路扩张评估方面有很好的一致性,包括扩张程度,阻塞性水平,和阻塞性影像学特征(序列间κ=0.924-1)。
3DBH-GRASEMRU显着缩短了采集时间,并实现了可比的图像质量,尿路可视化,和传统3DRT-FSEMRU的诊断性能。带有GRASE的屏气3DMRU可以提供可行的尿路扩张评估。
To compare the performance of 3D MRU based on a breath-hold gradient- and spin-echo (BH-
GRASE) technique with conventional 3D respiratory-triggered FSE (RT-FSE) sequence in patients with urinary tract dilation.
We prospectively included 90 patients with urinary tract dilation who underwent both 3D BH-
GRASE and RT-FSE MRU at 3T. The acquisition time of two MRU sequences was recorded. Three readers blinded to the protocols reviewed the image quality using a five-point scale and assessed the diagnostic performance related to urinary tract dilation. The relative contrast ratio (CR) between the urinary tract and adjacent area was measured quantitatively.
Acquisition time was 14.8 s for BH-
GRASE MRU and 213.6 ± 52.2 s for RT-FSE MRU. The qualitative image analysis demonstrated significant equivalence between the two MRU protocols. 3D BH-GRASE MRU better depicted bilateral renal calyces than RT-FSE MRU (p < 0.05). The CR values of the urinary tract were lower on BH-
GRASE MRU compared with RT-FSE MRU (p < 0.05). There were excellent agreements in the assessment of urinary tract dilation between BH-GRASE and RT-FSE MRU, including the dilated degree, obstructive level, and obstructive imaging features (inter-sequence κ = 0.924-1).
3D BH-GRASE MRU significantly decreased the acquisition time and achieved comparable image quality, urinary tract visualization, and diagnostic performance with conventional 3D RT-FSE MRU. Breath-hold 3D MRU with
GRASE may provide a feasible evaluation of urinary tract dilation.