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Abstract #2495

Semi-automatic quantification of long-term stability and image quality of a parallel transmit system at 7T

Marcel Gratz 1,2 , Maximilian Vlker 2 , Sren Johst 2 , Mark E Ladd 2,3 , and Harald H Quick 1,2

1 High Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany, 2 Erwin L. Hahn Institute for Magnetic Resonance Imaging, University of Duisburg-Essen, Essen, Germany, 3 Medical Physics in Radiology, German Cancer Research Center, Heidelberg, Germany

An image-based approach to quantify the performance and long-term stability of parallel transmit (pTx) MR systems is presented that uses a specific target excitation. Semi-automatic analysis is performed with a custom-written Matlab software that automatically segments the acquired image and aims to obtain reference points as well as characteristic image properties that are compared to target parameters. Thus, the system performance can be tracked with multiple parameters quantitatively over time and compared to other pTx systems without further requirements. Moreover, fluctuations and drifts of the transmit power as well as timing problems may be detected.

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