RF coils are key components in MRI because they generate a B1 magnetic field and receive spin relaxation signals. Our team's role at the Neuroscience Research Institute is the development and optimization of RF coil geometry and the interface for high resolution images.
1. Multi-channel phased array coils
We currently use phased array coils as our mainstream coils because they provide higher SNR compared to volume coils, while also allowing the use of parallel imaging applications. The receiver array coil generally consists of a number of mutually decoupled surface coils that simultaneously receive MR signals. These coils provide a higher sensitivity than a volume coil. Mutual coupling between coils by overlapping adjacent coils and all array coils are minimized by decoupling schemes. The following are typical examples of the various multichannel Rx and TR/Rx coils developed for the 7.0T MRI.
Fig. 1. Neuroscience Research Institute's 8-channel array coil
Fig. 2. Neuroscience Research Institute's 12-channel array coil
Fig. 3. Comparison of uniformity along the S-I direction of 8-channel and 12-channel array coils
Fig. 4. An example of a 16-channel array coil
Fig. 5. An example of a 32-channel array coil
• Multichannel TR/Rx coils with Passive Dividers
The TR switch and power divider are key components needed to connect the coils to the MRI system.
Fig. 6. TR switch and power divider used for the multichannel TR/Rx coil
Fig. 7. Multichannel Tx/Rx coil using the passive divider network: 8-channel and 16-channel
• Research Interests
Multichannel Tx/Rx coil
Multichannel phased array coil