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BackTable / VI / Tool
Ellipsoid Volume Calculator
An ellipsoid volume calculator is a dedicated mathematical tool designed to determine the volume of an ellipsoid-shaped item, such as a prostate. To utilize this instrument, you must have the prostate's dimensions in terms of length, width, and height (measured in centimeters). The ellipsoid volume estimator can also be applied to the bladder and ellipsoidal lesions. This computation offers an approximate value.
Upon entering the measurements into the ellipsoid volume estimator, it will compute both the ellipsoid and bullet volumes. If the prostate gland measures less than 55 mL, the bullet volume might provide a more precise assessment of the prostate's volume. If you possess the prostate-specific antigen (PSA) in ng/mL, the ellipsoid volume estimator will additionally function as a PSA density calculator, supplying you with a PSA density figure.
Ellipsoid Volume Calculator
Prostate Length (cm):
Prostate Width (cm):
Prostate Height (cm):
PSA Value (ng/mL):
Value
Value
Value
Value
Value
Ellipsoid Size Measurements
• Length (L): Can be obtained by measuring the longitudinal diameter. For a prostate, this is between the urinary bladder and the proximal external sphincter.
• Width (W): Can be obtained by calculating the maximal transverse diameter. For a prostate, this is at the midgland level.
• Height (H): Is the ellipsoid’s anteroposterior diameter. For a prostate, this can be found on either the axial or sagittal planes.
• PSA: A prostate-specific antigen test can measure the level of PSA in the blood.
Volume & Density Equations
The ellipsoid volume & density calculator uses different equations for an ellipsoid and bullet:
• Ellipsoid volume: L x W x H x 𝜋/6
• Ellipsoid PSA density: PSA / Ellipsoid Volume
• Bullet volume: L x W x H x 5𝜋/24
• Bullet PSA density: PSA / Bullet Volume
Ellipsoid Volume Calculator Clinical Applications
Calculating the volume of an ellipsoid shape, like a prostate, can be helpful when diagnosing and managing benign prostatic hyperplasia (BPH) and adenocarcinoma. PSA density can help distinguish between BPH and prostate cancer, and is often used to determine the need for prostate biopsy. Prostate volume can be used along with the Gleason Score to prognosticate prostate cancer recurrence.
Learn more on the BackTable VI Podcast
BackTable is a knowledge resource for physicians by physicians. Get practical advice on the Ellipsoid Volume Calculator and how to build your practice by listening to the BackTable VI Podcast, reading exclusing BackTable Articles, and following the work of our Contributors.
Disclaimer: The Materials available on BackTable.com are for informational and educational purposes only and are not a substitute for the professional judgment of a healthcare professional in diagnosing and treating patients. The opinions expressed by participants of the BackTable Podcast belong solely to the participants, and do not necessarily reflect the views of BackTable.
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