Sigmund G, Stoever B, Zimmerhackl L B, Frankenschmidt A, Nitzsche E, Leititis J U, Struwe F E, Hennig J
Department of Diagnostic Radiology, University of Freiburg, FRG.
Pediatr Radiol. 1991;21(6):416-20. doi: 10.1007/BF02026676.
RARE-MR-urography (Rapid Acquisition with Relaxation Enhancement) is a fast MR imaging technique (6.4 s/acquisition) that selectively depicts fluid by heavy T2-weighting. From 9/1989 to 11/1990, RARE-MR urograms were prospectively evaluated in the diagnosis of upper urinary tract abnormalities in 55 children. The method is performed in several planes and combined with a coronal, T1-weighted spin-echo sequence. Forty out of 42 kidneys with dilated renal pelvis, and 21 out of 24 dilated ureters were identified, only the mildly dilated ones were missed. Even in non-functioning kidneys the urinary tract was clearly depicted by RARE-MR-urography. However, no differentiation could be made with this technique between vesicoureteral reflux and non-refluxing dilatation of ureter and/or renal pelvis. All 19 pelviureteric obstructions and all eight renal duplications with a dilated segment were identified. RARE-MR-urography is a new tool for diagnosing urinary tract abnormalities in children without having to employ ionizing radiation, contrast media, or general anesthesia. A dilated urinary tract can be shown in one image displaying the entire urinary system, similar to excretory urography. The technique is presently not able to provide the information of voiding cystourethrography or renal scintigraphy, nor is it as easy to perform as ultrasound. However, in certain cases it may replace excretory urography.
快速采集弛豫增强磁共振尿路造影（RARE-MR-urography）是一种快速磁共振成像技术（每次采集6.4秒），通过重T2加权选择性显示液体。1989年9月至1990年11月，对55例儿童进行了RARE-MR尿路造影，前瞻性评估其在上尿路异常诊断中的应用。该方法在多个平面进行，并与冠状面T1加权自旋回波序列相结合。42例肾盂扩张的肾脏中，有40例被识别出来；24例输尿管扩张的病例中，有21例被识别出来，只有轻度扩张的病例被漏诊。即使是无功能肾，RARE-MR尿路造影也能清晰显示尿路。然而，该技术无法区分膀胱输尿管反流与输尿管和/或肾盂的非反流性扩张。所有19例肾盂输尿管梗阻以及所有8例伴有扩张节段的重复肾均被识别出来。RARE-MR尿路造影是一种诊断儿童尿路异常的新工具，无需使用电离辐射、造影剂或全身麻醉。一张显示整个泌尿系统的图像就能显示扩张的尿路，类似于排泄性尿路造影。目前该技术无法提供排尿性膀胱尿道造影或肾闪烁显像的信息，操作也不像超声那么简便。然而，在某些情况下，它可能会取代排泄性尿路造影。
