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Related Concept Videos

Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

67
Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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Related Experiment Video

Updated: Oct 3, 2025

Use of MRI-ultrasound Fusion to Achieve Targeted Prostate Biopsy
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Prostate volume prediction on MRI: tools, accuracy and variability.

Dimitri Hamzaoui1, Sarah Montagne2,3,4, Benjamin Granger5,6

  • 1Inria, Epione Team, Sophia Antipolis, Université Côte d'Azur, Nice, France.

European Radiology
|February 16, 2022
PubMed
Summary
This summary is machine-generated.

Manual planimetry offers the most reliable prostate volume estimation with the lowest variability. Ellipsoid formulas are reproducible but show higher reader variability and potential overestimation of prostate cancer volume.

Keywords:
Magnetic resonance imagingPSAProstateSegmentationVolume

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Area of Science:

  • Radiology
  • Medical Imaging
  • Prostate Cancer Management

Background:

  • Accurate prostate volume (PV) estimation is crucial for prostate cancer management.
  • Variability in PV measurements can impact treatment decisions and PSA density (PSAd) calculations.

Purpose of the Study:

  • To compare the intra- and inter-rater variability of prostate volume measurements using manual planimetry (MPM) and two ellipsoid formulas (traditional - TEF, biproximate - BPEF).
  • To assess the impact of different PV estimation methods on PSA density classification.

Main Methods:

  • A multi-rater study involving 7 radiologists assessing prostate MRI from 40 treatment-naive patients.
  • PV and PSAd were calculated using TEF, BPEF, and MPM (ground truth).
  • Intra- and inter-rater variability were quantified using intraclass correlation coefficients (ICC).

Main Results:

  • All methods demonstrated excellent reproducibility (ICC > 0.90).
  • MPM showed the highest inter-rater reproducibility (ICC = 0.999).
  • TEF and BPEF overestimated PV compared to MPM, with TEF showing significant overestimation (+1.91 cm³).
  • Inter-rater variability led to PSAd classification discrepancies in 5% (MPM), 17.5% (TEF), and 22.5% (BPEF) of patients.

Conclusions:

  • Manual planimetry is a robust and reproducible method for prostate volume assessment with minimal reader variability.
  • Ellipsoid formulas provide accurate and reproducible PV estimates but exhibit higher inter-rater variability.
  • The traditional ellipsoid formula may overestimate prostate volume, potentially affecting PSAd-based clinical criteria.