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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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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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Diffusion-weighted Imaging Distortion in Prostate MRI: A Cross-sectional Study Comparing Supine and Prone

Kang-Lung Lee, Andrew B Gill, Dimitri A Kessler

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    Summary
    This summary is machine-generated.

    Prone positioning in prostate MRI reduces rectal air and diffusion-weighted imaging (DWI) distortion, particularly when air is present. However, it degrades T2-weighted imaging (T2WI) quality, impacting diagnostic accuracy.

    Keywords:
    MRIcancerdiffusion-weighted imagingimage distortionpatient positioningprostate

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    Area of Science:

    • Radiology
    • Medical Imaging
    • Prostate Cancer Diagnostics

    Background:

    • Diffusion-weighted imaging (DWI) is crucial for multiparametric (mp) prostate MRI.
    • Echo-planar DWI techniques are prone to distortion near the recto-prostatic air-tissue interface.

    Purpose of the Study:

    • To evaluate if prone patient positioning minimizes rectal air and DWI distortion compared to supine positioning.
    • To assess the impact of prone positioning on overall image quality.

    Main Methods:

    • Prospective study of patients undergoing mpMRI for suspected prostate cancer.
    • Quantitative measurement of DWI distortion and rectal air volume.
    • Qualitative assessment of DWI and T2-weighted imaging (T2WI) using PI-QUAL and Likert scales.

    Main Results:

    • Prone positioning significantly reduced rectal air volume and improved qualitative DWI quality.
    • T2WI quality was significantly inferior in the prone position.
    • DWI distortion was reduced in prone positioning for patients with significant rectal air (>4 cm³).
    • Prone imaging added an average of 8 minutes 18 seconds to scan time.

    Conclusions:

    • Prone positioning effectively reduces DWI distortion and rectal air in prostate MRI.
    • The benefit of reduced DWI distortion must be weighed against the degradation of T2WI quality.
    • Prone positioning is beneficial for DWI quality when rectal air is a concern, but may compromise T2WI assessment.