الفهرس 
ANATOMY OF THE URINARY SYSTEMOnly 14 pages are availabe for public view
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Abstract
MRU has intrinsic high soft tissue contrast resolution and multiplanar 3D reconstruction capabilities, without the use of radiation. Additionally, MRU allows quantification of numerous renal functional parameters including transit times, an index of glomerular filtration rate (GFR), and differential renal functions. To date, MRU may serve as the most comprehensive and definitive study in the evaluation of urinary tract obstruction, complex genitourinary anomalies, and infection.
Although existance of few limitations in MRI such as the need of sedation for young children, inability of sedated patients to completely empty their bladder, small renal calculi may be not seen in MR so CT remains the gold standard for the detection of small urinary tract calculi and new recommendations of making every effort to avoid administering gadolinium based contrast material in patients with moderate to severe renal insufficiency (GFR <30 mL/min)to avoid linkage between the disorder nephrogenic systemic fibrosis (NSF) to gadolinium administration, there has been great expectation that dynamic contrast enhanced MRI would be able to substitute to both renal ultrasonography and scintigraphy. It has the ability to provide very detailed anatomical description combined with a functional evaluation and identifying other pathology that could influence prognosis.
Finally, MR urography represents the next step in the evolution of uroradiology in children by combining superb anatomic imaging with quantitative functional evaluation in a single examination that does not use ionizing radiation.MR imaging has inherently greater soft-tissue contrast than other imaging techniques.