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Rapid three-dimensional angiography with undersampled MR imaging.

V J Wedeen, Y S Chao

    Journal of Computer Assisted Tomography
    |January 1, 1987
    PubMed
    Summary
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    This study presents a novel magnetic resonance angiography method to significantly reduce scan times. The technique achieves high-resolution 3D vascular imaging by undersampling data and correcting aliasing artifacts.

    Area of Science:

    • Medical Imaging
    • Cardiovascular Imaging
    • Magnetic Resonance Imaging

    Background:

    • Subtraction angiography using magnetic resonance imaging (MRI) has advanced to 3D.
    • Traditional 3D MRI angiography requires extensive data acquisition time.

    Purpose of the Study:

    • To present a novel method for 3D MRI subtraction angiography that drastically reduces data acquisition time.
    • To demonstrate the feasibility of this technique for visualizing the vascular tree, specifically the abdominal aorta.

    Main Methods:

    • Acquisition of electrocardiogram-gated 3D MRI images using Fourier transform techniques.
    • Generation of flow contrast by subtracting image pairs acquired at different cardiac cycle phases.
    • Significant data acquisition time reduction by acquiring only 1/64 of the standard phase-encoding steps.

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  • Rectification of aliasing artifacts through a two-stage process involving image reassembly and surface detection.

    • Main Results:

    • Achieved a reduction in data acquisition time by at least an order of magnitude.
    • Maintained spatial resolution despite data undersampling.
    • Successfully visualized the vascular tree in 3D perspective using surface detection and 3D display.
    • Demonstrated the method's application in studies of the abdominal aorta.

    Conclusions:

    • The novel undersampling and artifact correction method enables rapid, high-resolution 3D MRI angiography.
    • This technique holds promise for efficient and detailed vascular imaging, particularly in cardiovascular applications.