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Radiology Volume Calculator

Radiology Volume Calculator

Measured in the longitudinal plane, represents the largest longitudinal section of the organ. Measured in the transverse plane at the level of the renal hilum, perpendicular to the longitudinal axis of the organ. Measured in the same transverse plane as the width, orthogonally.

Last updated: 01-01-2024

Notes

  • 3- dimensional volume measurements are far superior to 2- dimensional measurements as anatomical and pathological structures can have one dimension skewed. For example, a tumor can be small in the axial dimensions but oblong, giving rise to a larger volume than what would have been estimated using two dimensions. These volume measurements are also ideal for the follow-up of tumors post-treatment as these tend to have irregular shapes.

  • Although direct volumetric measurements are ideal, this may not be feasible in all cases as it is time-consuming. Volume calculations are a good alternative. That said, the volume may not be feasible in all conditions a single dimension can also be useful.

  • The generic formula for calculating volume on ultrasound / CT / MRI is length x breadth x height x 0.523, which assumes that most structures are ellipsoid (like an ellipsoid). Cc and ml are used interchangeably, especially for prostate. I like to use cc as that is the true measurement. A few modifications of these formulae have been developed and integrated into the above formula