Abstract #0955

Near Metal MRI with Compressed Sensing PETRA

Serhat Ilbey¹, Michael Bock¹, Matthias Jung², Lukas Konstantinidis³, and Ali Özen¹

¹Dept. of Radiology, Medical Physics, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany, ²Department of Diagnostic and Interventional Radiology, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany, ³Department of Orthopaedics and Trauma Surgery, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany

Synopsis

MRI near metallic implants require high bandwidth excitation and acquisition to minimize signal void and pile-up artefacts. In this work, compressed sensing PETRA (csPETRA) was modified to have intentionally a longer TE, so that the phase-encoding part of the k-space is extended. To prevent extremely long scan times, SPI points in csPETRA sequence are pseudo-randomly undersampled to reduce the scan time below 6 minutes. csPETRA reduced artifacts near metal significantly while preserving the anatomical details. Isotropic 3D MRI of two volunteers with mouth and knee prostheses was performed with csPETRA and the artifacts are significantly reduced compared to T1w-WARP sequence.

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