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Abstract #3089

Time and SAR efficiency in Imaging of Metal Orthopedic Hardware Utilizing Optimized Turbo Spin Echo Sequences

Mahesh Bharath Keerthivasan1, Mary Bruno2, Jan Fritz2, and Iman Khodarahmi2
1MR R&D Collaborations, Siemens Medical Solutions USA Inc, New York, NY, United States, 2Department of Radiology, , New York University Langone School of Medicine, New York, NY, United States

Synopsis

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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Keywords