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Technical artifacts in magnetic resonance imaging.

W S Yamanashi, K K Wheatley, P D Lester

    Physiological Chemistry and Physics and Medical NMR
    |January 1, 1984
    PubMed
    Summary
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    This study details Magnetic Resonance Imaging (MRI) artifacts from imaging techniques like projection reconstruction and 2D-FT. It explains instrument and patient-related causes and minimization strategies for clearer MRI scans.

    Area of Science:

    • Medical Imaging
    • Radiology
    • Biophysics

    Background:

    • Magnetic Resonance Imaging (MRI) is a crucial diagnostic tool.
    • Artifacts can compromise image quality and diagnostic accuracy.
    • Understanding artifact sources is vital for image optimization.

    Purpose of the Study:

    • To describe and illustrate common artifacts in MRI.
    • To differentiate between instrument-related and patient-related artifacts.
    • To discuss the causes and potential mitigation of these artifacts.

    Main Methods:

    • Utilized MRI imaging at 0.15 Tesla (projection reconstruction) and 0.27 Tesla (2D-FT).
    • Acquired images using a superconducting magnet system.
    • Systematically documented various artifact types.

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    Main Results:

    • Instrument artifacts identified include DC, projection, gradient offset, shimming, phase encoding, and pulse sequencing.
    • Patient-related artifacts observed were motion, ferromagnetic effects, and tissue content variations.
    • Demonstrated specific examples of these artifacts at different field strengths and imaging methods.

    Conclusions:

    • Comprehensive understanding of MRI artifacts is essential for radiologists and technicians.
    • Identifying artifact sources aids in implementing corrective measures.
    • Minimizing artifacts improves the reliability and diagnostic value of MRI examinations.