Abstract #4846
Experimental Investigations on Gradient Coil Induced Magnet Heating in MRI System
Longzhi Jiang 1 , Yihe Hua 2 , Liya Ma 3 , Sung Moon 1 , Jun Li 2 , Kishore Mogatadakala 1 , and Tim Havens 1
1
Global MRI, GE Healthcare, Florence, SC,
United States,
2
GE
Global Research, Shanghai, China,
3
GE
Healthcare, Beijing, China
The dynamic coupling between gradient coil and magnet
has generated image quality issues at low frequencies
and limited operational duty cycle at medium and high
frequencies due to induced magnet Joule heating. With
the combined demand for high patient through-put and
high performance gradient coils in high field MRI
systems, numerous researchers have attempted to develop
both improved simulation capability and experimental
apparatus to understand the Joule heating induced helium
boil-off. However, to the authors best knowledge, the
effects of dynamic coupling induced Joule heating is not
yet fully understood. In this study, a novel
experimental apparatus was devised to understand
gradient coil induced magnet heating under different
gradient coil mounting conditions. The apparatus
included a whole body magnet with hermetically sealed
cooling system having very limited helium volume and a
gradient coil with minimum interaction. This paper
demonstrates consistent correlation between the full
mechanical-electro-magnetic coupling model and the
experimental results. Furthermore, 100% operational duty
cycle has been achieved for clinical protocols.
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