Study On The Relationship Between CT-attenuation Values And The Composition Of Urinary Stones & The Therapeutic Effect Of ESWL

Objectives: Studies suggest that HU values on noncontrast computerized tomography(NCCT) may predict the ability to fragment urinary calculi. In our study, we sought to determine whether the NCCT could be used to predict the composition of urinary stones and could be used to predict the therapeutic effect of extracorporeal shock wave lithotripsy.Methods: We evaluated 34 patients who underwent extracorporeal shock wave lithotripsy for 15 to 23 mm upper urinary tract stones. Chemical analyses and HU calculations were performed for each stone, and one month later posttreatment ultrasonography were used to assess and categorize patients into a stone-free or a residual stone group. We also measured the maximal length after ESWL in ultrasonography. Statistical analysis was performed using the Student t test to compare mean HU values in the 2 groups and the mean maximal length after ESWL in the 2 groups.Results: Chemical analysis revealed that most calculi is calcium oxalate and calcium phosphate stones in residual stone group, while uric acid stone often been found in stone-free group. Of the patients...