Estimation of Size of Distal Ureteral Stones: Noncontrast CT Scan Versus Actual Size

Urinary stone size estimation: a new segmentation algorithm-based CT method

“…A phantom study would have had the advantage of objective reference size estimation, but would suffer from the problem of generalisation to clinical examinations. As demonstrated by Kishore et al, a correlation between a 'true' stone size in vivo and an apparent stone size in CT is difficult [10]. Although a recent study [11] has reported that the bone window is more accurate in stone size estimation, the soft tissue window has been used historically [12].…”

Making renal stones change size—impact of CT image post processing and reader variability

“…However there does not seem to be a standard procedure for measuring a renal stone and review of the previous studies in which measurements of renal stones have been reported indicated that the techniques vary [1,3,[7][8][9][10][11].…”

“…Some of the parameters that differ in previous studies are reformat planes, slice thickness, slice increment and window settings [1,3,[7][8][9][10][11]. Modern CT equipment allows a large number of different image postprocessing techniques that change the image presented.…”

How effective is extracorporeal shock wave lithotripsy of ureteral stones with Dornier Lithotripter S EMSE 220F-XXP? A prospective and preliminary assessment

“…Follow-up was carried out 6 weeks after treatment by means of KUB film and ultrasound, or helical CT, the choice being based upon stone radiodensity, patient age, and obstruction degree. In fact, routine use of noncontrast CT to detect ureteral stones is still subject to debate, as collimation thickness and the arbitrary choice of multiplying reconstruction may affect outcomes [12,13]. Given these limitations, we believe that the tools and the timing we applied can be considered an adequate choice to detect residual or persisting stones and/ or their signs.…”