RF breakdown in vacuum layers for MRI noise reduction
Nistler J, Renz W, Stark H, Rausch M
Siemens Medical Solutions
Vacuum layers can be used very effectively to reduce noise in mri systems. The integration of rf coils into the vacuum is limited by a decrease in breakdown voltage. We investigated a setup with an rf shield inside the vacuum and the rf coil outside the vacuum. In this setup it was possible to operate the rf coil with a B1 field strength of 50&[micro]T without arcing in the vacuum area.