Abstract #1405

Evaluation of Metal-Artifact Reduction Techniques at 7T: Hardware adaption, phantom study, and preliminary in vivo results

Oliver Kraff¹, Niklas Deuermeier^1,2, Markus W May^1,3, Viktor Pfaffenrot¹, Jana Theisejans⁴, Jens M Theysohn⁵, and Harald H Quick^1,3

¹Erwin L. Hahn Institute for MRI, University Duisburg-Essen, Essen, Germany, ²Westphalian University of Applied Sciences, Gelsenkirchen, Germany, ³High-Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany, ⁴General Psychology: Cognition and Center for Behavioral Addiction Research (CeBAR), University Duisburg-Essen, Duisburg, Germany, ⁵Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen, Germany

Synopsis

Keywords: High-Field MRI, High-Field MRI, artifacts, MSK

Motivation: Advanced metal-artifact reduction sequences (MARS) are currently only available in parallel transmission (pTx) research mode at 7T, while clinically approved RF coils are single-channel transmit (sTx) coils.

Goal(s): Our goal was to build an adapter to connect a sTx knee coil to a pTx system, and to evaluate MARS techniques in phantom and in vivo scans.

Approach: An evaluation of artifact reduction using advanced MARS techniques was performed in a phantom study. Knees of three volunteers with metallic suture plates were imaged.

Results: Optimized bandwidth and view-angle-tilting (VAT) effectively reduced metal artifacts while keeping acquisition time and SAR load acceptable.

Impact: A hardware adaption for connecting a sTx coil to a pTx system was evaluated for safe in vivo usage. The application of MARS was demonstrated for the first time at 7T in volunteers with metallic suture plates after ACL reconstruction.

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