The ellipsoid formula, the prolate ellipse formula, and the three-dimensional (3D) volume measuring method are all ways for calculating bladder volume on ultrasound.
The ellipsoid formula, which assumes the bladder has an ellipsoidal shape, is the most widely employed approach. The formula is as follows: Bladder volume = /6 x Length x Width x Height
where Length denotes the longitudinal diameter, Width denotes the transverse diameter, and Height denotes the bladder’s anterior-posterior diameter. The bladder’s transverse and longitudinal images are used to acquire the measures.
The prolate ellipse formula assumes that the bladder is shaped like a prolate ellipse. The formula is as follows: Bladder volume = 4 x Length x Width x Height
where Length, Width, and Height are equal In the ellipsoid formula.
Three-dimensional (3D) volume measuring method: This method obtains a 3D image of the bladder and then uses computer algorithms to calculate the bladder volume. Although this method is more accurate than the ellipsoid or prolate ellipse formulas, it necessitates the use of specialized equipment and software.
It’s vital to note that bladder shape, filling status, and measurement errors can all affect the accuracy of these approaches. As a result, these approaches are typically utilized as approximations rather than precise measurements of bladder volume. Other procedures, including as catheterization or a bladder scanner, may be employed in some circumstances for more accurate measures.