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Abstract #1394

Noise Reduction of Impulse Response Function of the Encoding Fields Calculation

Frederik Testud 1 , Johanna S. Vannesj 2 , Christoph Barmet 2,3 , Klaas P. Pruessmann 2 , Jrgen Hennig 1 , and Maxim Zaitsev 1

1 Medical Physics, Department of Radiology, University Medical Center, Freiburg, Germany, 2 Institute for Biomedical Engineering, University and ETH Zrich, Zrich, Switzerland, 3 Skope Magnetic Resonance Technologies, Zrich, Switzerland

The Impulse Response function of the scanners Encoding Fields (IREFs) allows improving the scanners preemphasis or the image reconstruction by predicting the encoding trajectory. The impulse response function was assessed by mean of magnetic field monitoring where the field evolution of triangular-shaped waveforms were used as inputs. The IREFs need to be low-pass filtered to reduce high-frequency noise. We propose to achieve this by obtaining the field probes phase derivative using the Savitzky-Golay filter and to use the discrete test waveform for IREF calculation. The repetition number can be potentially reduced by the proposed improvements in the impulse response calculation.

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