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Related Concept Videos

Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

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: Jun 29, 2026

Use of MRI-ultrasound Fusion to Achieve Targeted Prostate Biopsy
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Quantitative MRI: Defining repeatability, reproducibility and accuracy for prostate cancer imaging biomarker

Y Wang1, S Tadimalla2, R Rai3

  • 1Institute of Medical Physics, School of Physics, Faculty of Science, The University of Sydney, Sydney, NSW, Australia; Ingham Institute for Applied Medical Research, Liverpool, NSW, Australia.

Magnetic Resonance Imaging
|January 3, 2021
PubMed
Summary

Quantitative MRI (qMRI) parameters like ADC, T1, and R2* show high repeatability and reproducibility, crucial for monitoring prostate cancer treatment response after radiotherapy.

Keywords:
AccuracyBiomarkerPhantomRepeatabilityReproducibilityqMRI

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Area of Science:

  • Medical Imaging
  • Oncology
  • Radiotherapy

Background:

  • Quantitative MRI (qMRI) parameters are vital for monitoring prostate cancer treatment response post-radiotherapy.
  • High repeatability and reproducibility of qMRI parameters are essential for accurate predictive models.

Purpose of the Study:

  • To measure uncertainties in qMRI parameters using commercial and in-house phantoms.
  • To guide the development of robust predictive models for prostate cancer treatment monitoring.

Main Methods:

  • Acquired ADC, T1, and R2* values on three 3T scanners using prostate-specific qMRI protocol and phantoms.
  • Assessed within-session and between-session repeatability, and accuracy of qMRI parameters.
  • Utilized B1 field mapping for T1 correction and evaluated parameter uncertainties.

Main Results:

  • Repeatability CV for ADC was <2.40%, reproducibility <3.98%, with accuracy between -8.0% to 2.7%.
  • B1 correction improved T1 repeatability/reproducibility (p<0.05) but increased accuracy error (p<0.001).
  • R2* repeatability was <4.5% and reproducibility <7.3% in the system phantom.

Conclusions:

  • This study quantified repeatability, reproducibility, and accuracy of qMRI parameters for prostate cancer.
  • Findings will identify robust qMRI parameters for predictive models in clinical trials.
  • Results support longitudinal monitoring of prostate cancer treatment response.