Simon Bauer1, Michael Markl1, Bernd Andre Jung1
1Department of Diagnostic Radiology, Medical Physics, University Hospital Freiburg, Freiburg, Germany
Many parallel imaging methods measure additional phase encoding lines for autocalibration of the reconstruction parameters to the coil sensitivities. This leads to a reduction of the net acceleration of the measurement. The aim of this work was to systematically evaluate trade-offs between undersampling factor and number of calibration lines for a given net acceleration for GRAPPA and PEAK-GRAPPA. Analysis was performed for in-vivo cardiac imaging and using a specially designed moving phantom. Optimal results regarding RMSE and noise were provided by the reconstructions using the smallest possible undersampling factor and number of calibration lines.