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Related Concept Videos

Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

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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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Reproducibility of MRI Radiomics Measurements in Men with Prostate Cancer Undergoing Active Surveillance.

Himanshu Sharma1, Haitham Al-Mubarak2, Juan Lloret Del Hoyo1

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Radiomics from T2-weighted imaging shows better prostate cancer measurement reproducibility than diffusion-weighted imaging. Larger prostate volumes and older age improve radiomics stability, but diffusion-based features need optimization for clinical use.

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Area of Science:

  • Radiology and Medical Imaging
  • Oncology
  • Quantitative Imaging

Background:

  • Magnetic resonance imaging (MRI)-based radiomics shows potential for prostate cancer (PCa) management.
  • Clinical application of radiomics requires reproducible measurements.
  • Bi-parametric MRI (bpMRI) is increasingly used for PCa assessment.

Purpose of the Study:

  • To assess the reproducibility of radiomics features from bpMRI in prostate cancer lesions and normal tissue.
  • To evaluate radiomics reproducibility across different MRI platforms, vendors, and observers.
  • To identify factors influencing radiomics reproducibility in men on active surveillance (AS).

Main Methods:

  • Retrospective analysis of 47 men with PCa undergoing AS, with two bpMRI scans approximately 12 months apart.
  • Radiomics features (shape, 1st/2nd order) extracted from T2-weighted imaging (T2-WI), diffusion-weighted imaging (DWI), and apparent diffusion coefficient (ADC) maps.
  • Reproducibility assessed using intraclass correlation coefficient (ICC) and coefficient of variation (CV) across intra-platform, inter-platform, and inter-observer settings.

Main Results:

  • T2-WI radiomics features demonstrated higher reproducibility (good/moderate ICCs) compared to DWI/ADC features for both lesions and non-tumoral tissue.
  • Intra- and inter-platform coefficients of variation (CVs) were lowest for T2-WI lesion features and background tissue.
  • Higher reproducibility was associated with larger prostate volume and older patient age; inter-observer analyses showed good/moderate ICCs across all sequences.

Conclusions:

  • T2-WI radiomics offer superior intra- and inter-platform reproducibility over DWI/ADC in prostate cancer assessment.
  • Patient factors like prostate volume and age significantly influence radiomics stability.
  • Optimization of diffusion-based radiomics features is crucial for enhancing reproducibility and clinical utility in prostate MRI.