Abstract #4821
Design of multi-channel switching system for matrix coils
Huijun Yu 1 , Frank Huethe 2 , Sebastian Littin 1 , Feng Jia 1 , Jrgen Hennig 1 , and Maxim Zaitsev 1
1
Dept. of Radiology, Medical Physics,
University Medical Center Freiburg, Freiburg, Germany,
2
Dept.
of Clinical Neurology and Neurophysiology, University of
Freiburg, Germany
We present a hardware design of multi-channel switches
for a dedicated matrix gradient coil. The switching
system is used to control the combination of the matrix
coil elements. The system consists of a controller and a
number of analog switches. The analog switches are
designed to be placed in the immediate vicinity of the
matrix coil elements inside the magnet bore. A timer
circuit in combination with a current source charges the
bootstrap capacitor periodically and generates the power
supply for the floating driver output circuit. The
realized setup for switching high currents switched
correctly following the coil setting code. Due to its
modular design, the number of channels can be customized
in future systems by choosing the appropriate number of
analog switches.
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