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• ELLIPSOID VOLUME CALCULATOR SOFTWARE

We recommend that research looking at stone clearance rates should use 3D-reconstructed stone volumes when available, followed by prolate, oblate, or scalene ellipsoid formulas depending on the maximum stone diameter.ĬT X-ray algebra kidney stone volume urolithiasis. As the maximum diameter increases, calculated stone volume becomes less accurate, suggesting that larger stones have more asymmetric shapes. If we chop it in half to get a circle, then the volume is the area of the circle times 2/3rd of the major. There was no difference in stone shape by location within the kidney.Īs the average shape of renal stones changes with diameter, no single equation for estimating stone volume can be recommended. In such case it is called a prolate ellipsoid. Smaller stones (15 mm towards scalene ellipsoids. The maximum stone diameter on X-ray was 3-25 mm and on CT was 3-36 mm, with a reasonable correlation (r = 0.77). Stone volumes were analysed to determine the average 'shape' of the stones. Correlation coefficients among all measured outcomes were compared. Find Volume of Ellipsoid or Find volume of different shapes and objects like Barrel, Cone, Cube, Cylinder, Capsule, Half Capsule, Ellipsoid, Elliptical Tank.

ELLIPSOID VOLUME CALCULATOR SOFTWARE

Stone volume was calculated using software designed to measure tissue density of a certain range within a specified region of interest. In all, 100 stones with both X-ray and CT (1-2-mm slices) were reviewed. Therefore, maximum diameters as measured by either X-ray or CT are used in the calculation of stone volume based on a scalene ellipsoid formula, as recommended by the European Association of Urology. While the precise measurement of stone volume by 3D reconstruction can be accomplished using modern computer tomography (CT) scanning software, this technique is not available in all hospitals or with routine acute colic scanning protocols. If all three have different lengths, the ellipsoid is commonly described as tri-axial. Kidney stone volume may be helpful in predicting treatment outcome for renal stones. To determine the optimal method for assessing stone volume, and thus stone burden, by comparing the accuracy of scalene, oblate, and prolate ellipsoid volume equations with three-dimensional (3D)-reconstructed stone volume.