Keywords: Joint, Acquisition Methods, Metallic Implant Imaging, Low SAR Imaging, Variable Flip Angle
Motivation: Metal artifact reduction sequences suffer from SAR resulting in longer scans.
Goal(s): Our goal was to reduce the sequence SAR without compromising image contrast and image quality.
Approach: We propose an optimization framework to design variable refocusing flip angles to minimize SAR while maintaining image quality comparable to clinical sequence. The prototype sequence was tested on a cohort of patients with metallic implants at 1.5T.
Results: The variable flip angle sequence generates images of comparable quality as conventional clinical acquisition while allowing savings in SAR and acquisition time.
Impact: Metal artifact reduction sequences that utilize the proposed variable flip angle framework result in lower SAR and scan time without any loss in image quality.
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