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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