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Higher strength main magnets and more demanding pulse sequences have driven interest in parallel excitation systems. Parallel transmit array coils need to be decoupled to be used effectively. Ultra-low output impedance power amplifiers have been proposed as a possible solution for this. They provide decoupling in a manner analogous to low input impedance preamplifiers. Chu et al suggest a tuning method...
Multiple channel radiofrequency (RF) transmitters are being used in magnetic resonance imaging to investigate a number of active research topics, including transmit SENSE and B shimming. Presently, the cost and availability of multiple channel transmitters restricts their use to relatively few sites. This paper describes the development and testing of a relatively inexpensive transmit system that...
The use of high-field MRI has introduced problems with full wave effects. Complex RF transmit pulses show promise as a viable solution to these problems. These RF pulses have driven a need for multi-channel transmit systems that are useable with techniques like Transmit SENSE. We have constructed an eight channel parallel transmit system that meets the requirements to be used for Transmit SENSE. Additionally,...
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