4 channel gradient power amplifier for low field MRI with currents up to 10 A
This GPA originated from a collaboration with Jason Stockmann (MGH Harvard). The device can drive up to 4 channels with max 10 A. It is controlled via a single SPI galvanically isolated connection that is also used to read information from the current sensors. Sample code for an Arduino is given that shows how to perform a calibration, set the output current and read current sensor information. The current nonlinearity (INL) is very small (<1%), because the integrated current sensor enables an efficient automatic software calibration. The GPA has been tested with the gradient coils of the TabletopMRI. A detailed documentation is available in the github documentation directory.
1University of Applied Sciences and Arts, Dortmund, Germany
2A.A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, Massachusetts, USA
3Department of Physics, Harvard University, Cambridge, Massachusetts, USA