Abstract #4119

Z-shim with Parallel-Transmit Methods (pTX) in MR Neuro Applications

Lukas Mario Gottwald¹, Rainer Schneider¹, and Josef Pfeuffer¹

¹MR Application Development, Siemens Healthcare, Erlangen, Germany

In clinical 3T imaging, gradient-echo-based sequences often suffer from signal loss induced by patient-specific susceptibility artifacts. To tackle this problem, a proposed local signal recovery z-shim method using parallel transmission was implemented for a clinical setup. The approach was further extended by an automated slice-specific delay-time calculation to ensure user-friendly operation as well as maximal signal gain in artifact regions. Studies in humans were carried out using commonly used GRE and EPI sequences. Signals could be nearly fully recovered in artifact regions; tSNR gain maps for EPI time series showed an increase up to 148%.

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