Disclaimer: The author makes no claims of the accuracy of the information contained herein; this information is for educational purposes only and is not a substitute for clinical judgment.
Ellipsoid volume = L x W x H x
π/6
"Bullet" (cylinder + half ellipsoid) volume = L x W x H x
5π/24
The "bullet" volume may be a better representation of prostate volume for prostate glands smaller than 55 mL.
MacMahon PJ, Kennedy A-M, Murphy DT, et al. Modified prostate volume algorithm improves transrectal US volume estimation in men presenting for prostate brachytherapy. Radiology 2009; 250:273-280
The PSA density calculation assumes that the length, width, and height are provided in centimeters, and the PSA in ng/mL.
The "bullet" volume may be a better representation of prostate volume for prostate glands smaller than 55 mL.
MacMahon PJ, Kennedy A-M, Murphy DT, et al. Modified prostate volume algorithm improves transrectal US volume estimation in men presenting for prostate brachytherapy. Radiology 2009; 250:273-280
The PSA density calculation assumes that the length, width, and height are provided in centimeters, and the PSA in ng/mL.