Üriner sistemde taş şüphesinde spiral bilgisayarlı tomografi ne zaman kullanılmalı?

The aim: The purpose of this study is comparing the sensitivity of ultrasonography (US) and the helical computed tomography (CT) for cases who have stone in urinary tract in the primary diagnose. Material-Method: The research includes 116 cases. US and CT examinations are performed by different radiologists. Hitachi Pronto SE was used for CT examination. Contrast agents did not used in CT examinations. Sensitivity, spesivity, positive and negative predictivity values of US calculated in the basis of CT results. Results: Renal calculi determined in 78 of 116 cases both in CT and US examinations. Renal calculi was determined in 48 of 78 cases, ureter calculi was determined 34 cases with CT. The sensitivity, spesivity, positive and negative predictivity values of US in renal calculi was calculated as respectively 87,5 %; 95 %; 95 % and %87,5. The sensitivity, spesivity, positive and negative predictivity values of US in ureterial calculi was calculated as respectively 58 %; 98 %; 94 % and %84. Conclusion: Because of the high sensitivity of determining the urinary system calculi of US, the direct urinary system graph/US combination should be the first chosen radiologic modality. However in non diagnosed symptomatic patients or ureter calculi suspicion low dose non-contrast helical CT examination should be the chosen modality. [ABSTRACT FROM AUTHOR]