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Abstract #0076

Externally Calibrated Parallel Imaging in the Presence of Metallic Implants

Curtis N Wiens 1 , Nathan S Artz 1,2 , Hyungseok Jang 1 , Alan B McMillan 1 , and Scott B Reeder 1,3

1 Department of Radiology, University of Wisconsin, Madison, Wisconsin, United States, 2 Department of Radiological Sciences, St. Jude Children's Research Hospital, Memphis, Tennessee, United States, 3 Department of Medical Physics, University of Wisconsin, Madison, Wisconsin, United States

3D multi-spectral imaging (3D-MSI) acquires multiple acquisitions at different frequency offsets, in order to excite signal over a wide range of off-resonance induced by metallic implants. Self-calibrated parallel imaging approaches can accelerate 3D-MSI techniques but a substantial amount of time is required to acquire calibration data for each offset. In this work we developed a method for exter-nally calibrated parallel imaging near metallic implants, and demonstrated feasibility using a hip prosthesis phantom and a volunteer with a cobalt/chromium/molybdenum alloy hip head placed posterior to the knee. Comparisons to self-calibrated parallel imaging showed significant reductions in acquisition time, particularly for SR-FPE with ~25% reductions in scan time.

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