Diagnostic Value of Low-field Magnetic Resonance Urography in Obstructive Diseases of Urinary Tract

Objective:To evaluate the diagnostic value of low-field magnetic resonance urography(MRU) in obstructive diseases of urinary tract.Methods:Sixty cases with obstructive diseases in urinary tract were examined with MRU and conventional MR,including 12 cases with uretal tumors,19 cases with uretal calculus,9 cases with inflammatory stricture of urinary tract,4 cases with strictures of ureteropelvic junction,6 cases with uretal malformation,9 cases with uretal obstruction caused by the pressure of pelvic tumors and 1 case with neuropathic bladder.The results were compared with those obtained by using ultrasonography(US),intravenous urography(IVU) and computed tomography(CT).Results:MRU could clearly show the obstructive locations in the urinary tract.The accuracy of the location diagnosis was 100%.If combined with conventional MRI,the diagnostic rating of the obstructive etiology was 86.7%.MRU was superior to US,IVU and CT.Conclusion:MRU has higher value in the diagnosis of obstructive diseases of urinary tract.It should become the first choice for those patients who cannot bear intravenous pyelography,such as children,elderly people and pregnant women.