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Related Experiment Videos

Boundary artifact due to truncation errors in MR imaging.

R B Lufkin, E Pusey, D D Stark

    AJR. American Journal of Roentgenology
    |December 1, 1986
    PubMed
    Summary
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    Boundary artifacts in Magnetic Resonance (MR) images are caused by truncating the Fourier series used to represent tissue edges. Recognizing this common MR imaging artifact prevents misdiagnosis of patient motion or disease.

    Area of Science:

    • Medical Imaging
    • Biophysics

    Background:

    • Magnetic Resonance (MR) imaging utilizes Fourier transforms to reconstruct images.
    • Tissue discontinuities and edges require an infinite Fourier series for accurate encoding.

    Purpose of the Study:

    • To investigate the nature and characteristics of boundary artifacts in MR images.
    • To differentiate boundary artifacts from other common MR artifacts like motion and chemical shift errors.

    Main Methods:

    • Utilized doped water phantoms and normal volunteers for MR imaging.
    • Acquired images on 0.3-T and 0.6-T MR imagers with varied sampling rates.
    • Analyzed artifact appearance in phase and frequency encoding directions.

    Main Results:

    • Boundary artifacts manifest as parallel lines or ringing near tissue discontinuities.

    Related Experiment Videos

  • Artifacts appeared in both phase and frequency encoding directions.
  • Increased sampling frequency led to higher frequency ringing; low-pass filtering reduced ringing but also fine detail.

    • Conclusions:

    • Boundary artifacts result from truncating the Fourier series in MR imaging.
    • It is crucial to distinguish these artifacts from patient motion or pathological findings.
    • Understanding boundary artifacts improves diagnostic accuracy in MR imaging.