College of Veterinary Medicine, Kyungpook National University, Daegu, South Korea.
College of Veterinary Medicine and BK21 Plus Project Team, Chonnam National University, Gwangju, South Korea.
Am J Vet Res. 2021 Dec 21;83(3):229-238. doi: 10.2460/ajvr.21.03.0041.
To assess the usefulness of magnetic resonance urography (MRU) for the visualization of nondilated renal pelvises and ureters in dogs and to compare our findings for MRU versus CT urography (CTU).
9 healthy Beagles.
Dogs underwent CTU, static-fluid MRU, and excretory MRU, with ≥ 7 days between procedures. Contrast medium was administered IV during CTU and excretory MRU, whereas urine in the urinary tract was an intrinsic contrast medium for static-fluid MRU. For each procedure, furosemide (1 mg/kg, IV) was administered, and reconstructed dorsal plane images were acquired 3 minutes (n = 2) and 7 minutes (2) later. Images were scored for visualization of those structures and for image quality, diameters of renal pelvises and ureters were measured, and results were compared across imaging techniques.
Excretory MRU and CTU allowed good visualization of the renal pelvises and ureters, whereas static-fluid MRU provided lower visualization of the ureters. Distention of the renal pelvises and ureters was good in excretory MRU and CTU. Distention of the ureters in static-fluid MRU was insufficient compared with that in CTU and excretory MRU. Distinct artifacts were not observed in CTU and excretory MRU images. Static-fluid MRU images had several mild motion artifacts.
Our findings indicated that excretory MRU with furosemide administration was useful for visualizing nondilated renal pelvises and ureters of dogs in the present study. When performing MRU for the evaluation of dogs without urinary tract dilation, excretory MRU may be more suitable than static-fluid MRU.
评估磁共振尿路成像（MRU）在显示犬非扩张肾盂和输尿管方面的作用，并比较 MRU 与 CT 尿路成像（CTU）的结果。
9 只健康比格犬。
犬接受 CTU、静态液体 MRU 和排泄性 MRU 检查，两次检查之间至少间隔 7 天。CTU 和排泄性 MRU 时经静脉注射对比剂，而静态液体 MRU 时尿路内尿液为内在对比剂。两种检查时均静脉注射呋塞米（1mg/kg），之后 3 分钟（n=2）和 7 分钟（2 次）时采集背侧位重建图像。对各检查技术显示结构和图像质量进行评分，测量肾盂和输尿管直径，并比较检查结果。
排泄性 MRU 和 CTU 可很好地显示肾盂和输尿管，而静态液体 MRU 对输尿管的显示效果较差。排泄性 MRU 和 CTU 可很好地扩张肾盂和输尿管。与 CTU 和排泄性 MRU 相比，静态液体 MRU 中输尿管扩张不足。CTU 和排泄性 MRU 图像中未观察到明显伪影。静态液体 MRU 图像有一些轻微运动伪影。
本研究结果表明，在本研究中，给予呋塞米的排泄性 MRU 可用于显示犬非扩张的肾盂和输尿管。在评估无尿路扩张的犬时，MRU 检查中排泄性 MRU 可能比静态液体 MRU 更适用。
