Computed Tomography is an important technique for imaging the urinary calculi using cross sectional images. The size and site of the calculi are significant aspect that are necessary for treatment. Therefore, present study aims to compare diameters of calculi measured using bone and soft tissue window settings in CT and also determinesmost frequent site for occurrence of calculi in urinary system. This is a retrospective study including total of 126 patients (91 males, 35 females, age range: 20-50 years). The patients who had undergone non contrast enhanced computed tomography of Kidney Ureter and Bladder (NCCT KUB) and diagnosed with urinary calculi were included in study. For each calculus found on CT image, two diameters such as maximum diameter and perpendicular diameter was measured on coronal plane using soft tissue and bone window settings. Site of calculi was also noted.To compare diameters measured using soft tissue and bone window settings Wilcoxon signed ranks test was used.Mean of maximum diameter and perpendicular diameter of the calculi measured by soft tissue and bone window settings in CT was 0.74±0.5, 0.82 ±1.8 and 0.79 ± 0.5,0.67 ± 0.49 respectively. It was found that there was significant difference in diameters of calculi measured using soft tissue and bone window setting (p<0.0001). The study concludes that there was mean difference of0.08 cms and 0.12 cms for maximum axial diameter and perpendicular diameter respectively measured using soft tissue and bone window settings in CT. Calculi in kidneys was most common site in our study population.
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