Comparative analysis of MR urography and CT in Calculus of urinary system

Abstract

Objective To research the imaging of urinary system of CT Urography and MR Urography.Evaluate the advantage and disadvantage of the two kind of examinational methods. In order to improve the diagnostic accurate of urinary system, and reduce the cost of examination. Methods To examine the urinary system of patients through multi-slice CT and(or) MR. Then process the images of CT or MR at workstation. The postprocessed images analyzed by two radiologists respectively. Results 78 cases with calculus of urinary system examined through CT were collected in our investigation, 60 cases among of them examined through MR. The sensitivity and specificity of calculus detection of CT were 100% and 100.0% respectively,while those of MR urography were 96% and 90%,There was significant difference between section widths of 2.5 mm of reconstructed images and 5.0 mm with regard to the number of detected microlith (P=0.000), All microlith failed to manifestate on MR images. There was no significant difference between the pictures quality of CT and MRU images (P=0.53). Thick slab MRU had superior image quality to multisection MIP MRU (P=0.041). Conclusion CT plain scan lamellar reconstruction has an advantage to demonstrate microlith of urinary system. MR urography allows the evaluation of pediatricand pregnant patients without the use of ionizing radiation. The large scan range of MSCT and MRU provide only one examination on patients with multi-focus. Combined with conventional images to provide a comprehensive evaluation of the urinary tract diseases of patients. Key words: Urinary system; Calculus; CT; MR Urography