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Improving ultrasound-based prostate volume estimation.

Saro Aprikian1, Murilo Luz1,2, Fadi Brimo1,3

  • 1Urologic Oncology Research Group, Cancer Research Program, Research Institute (RI) of McGill University Health Center (MUHC), Glen Campus, E M2.2210, 1001 Blvd Décarie, Montréal, Qc, H4A 3J1, Canada.

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|July 26, 2019
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Summary
This summary is machine-generated.

A new coefficient (0.66) improves prostate volume estimation using transrectal ultrasound (TRUS) dimensions. This refined formula offers a more accurate assessment compared to existing methods, aiding in clinical decisions.

Keywords:
BulletCoefficientEllipsoidFormulaProstate volumeTrans-rectal ultrasound

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Area of Science:

  • Urology
  • Medical Imaging
  • Prostate Health

Background:

  • Accurate prostate volume estimation is crucial for diagnosis and treatment planning.
  • Current methods using transrectal ultrasound (TRUS) have limitations in precision.
  • A need exists for improved formulas utilizing fresh prostate dimensions.

Purpose of the Study:

  • To define a novel coefficient for a simplified prostate volume formula (L x H x W x Coefficient).
  • To enhance the accuracy of prostate volume estimation from TRUS imaging.
  • To compare the performance of the new formula against existing ellipsoid and bullet-shaped formulas.

Main Methods:

  • Prostate glands (n=153) were measured (L, H, W) and weighed immediately post-surgery.
  • Prostate density and volume were determined via water displacement.
  • TRUS data were correlated with physical measurements using linear regression analysis.

Main Results:

  • A coefficient of 0.66 provided the best fit for the L x H x W formula, yielding an R² of 0.64.
  • The new formula demonstrated improved accuracy, with only 5.7% overestimation compared to 18% for the ellipsoid formula.
  • TRUS overestimated prostate length and height but not width, indicating dimensional biases in imaging.

Conclusions:

  • A new, empirically derived coefficient (0.66) significantly enhances prostate volume accuracy from TRUS.
  • The findings support a bullet-shaped model over an ellipsoid for prostate morphology.
  • This improved formula offers a more precise estimation of true prostate volume in clinical practice.