Reduction of Artifacts Arising From Non-Ideal Gradients in Fast Magnetic Resonance Imaging

TL;DRAbstract

This project focuses on the development and validation of techniques to reduce two image artifacts arising from gradient system imperfections in fast magnetic resonance imaging (MRI). These artifacts can severely compromise image quality and adversely affect clinical diagnoses.\n\n\nThe first artifact is a wrap-around artifact called the cusp artifact in a pulse sequence called fast spin echo (FSE). This artifact arises from gradient non-linearity away from the magnet isocenter, and appears as a line or ‘feather’ on non-axial FSE images of the spine or knee. To reduce this artifact, an FSE pulse sequence was modified to slightly tilt the slice selected by the radiofrequency (RF) excitation pulse away from the slice selected by the RF refocusing pulses. As a result, the signals from the artifact-prone region are reduced, while the signals from within the field of view are largely retained. This technique reduced the artifact intensity by 50~90% on phantom and volunteer images, and can b

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