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Abstract #4965

Robust T2 Mapping in the Presence of Large B1+ Inhomogeneities

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: Other Musculoskeletal, Relaxometry, T2 Mapping, B1+ Mapping, Metallic Implant Imaging

Motivation: Large B1+ variations near metallic implants results in errors in quantitative measurements.

Goal(s): We propose a robust T2 relaxometry technique that accounts for large B1+ inhomogeneities near metallic implants.

Approach: We developed a multi-echo TSE sequence that uses variable excite and refocusing flip angles to sensitize the sequence to both T2 and B1+ variations. We propose the use of two fitting algorithms to estimate B1+ robust T2 estimates.

Results: In the presence of metallic implants, the proposed technique allows improved estimation of the B1+ variations which in turn improves the T2 estimation.

Impact: The use of a B1+ sensitized TSE sequence to estimate T2 relaxometry can improve estimation performance in areas of large B1+ inhomogeneities near metallic implants. This would allow quantitative assessment and characterization of bone pathology near the arthroplastic implant interface.

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Keywords