Study of Renal Calculi using Computed Tomography

Abstract

The objective of this study is to evaluate renal calculi using non-contrast computed tomography kidney, ureter and bladder (KUB). A prospective cross-sectional study was executed and data were collected On October 2015 from Alamal hospital, included fifty subject,45 identified renal stone the included subjects were diagnosed to have < 2mm nephrolithiasis with non-contrast helical CT scan and KUB X-ray, which were carried out on the same day. Nephrolithiasis characteristics such as stone location, stone size, CT attenuation value,number of slice thickness, CT-scout film and KUB radiograph appearance were recorded independently. The cases were included. 25 out of 27 CT-scout film detected nephrolithiasis were identified on plain radiograph and determined as radio-opaque with sensitivity 92%. The determined value of HU utilized for prediction of radiographic characteristics was 617 HU at which urinary calculi were not seen at CT-scout film and were KUB X-ray radio-opaque According to graph ( 4:1) and equation demonstrated that the density increased by 11 density/mm of stone thickness starting from 617HU