Abstract #4283

Improved transmit efficiency with Slotted Microstrip Transmission Line RF Coil Element for Ultra-high magnetic field MR Imaging

Vijayaraghavan Panda¹, Siva Sai Krishna Puranam¹, Lance Delabarre², Gregor Adriany^1,2, and Anand Gopinath¹

¹Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN, United States, ²Radiology, Center for Magnetic Resonance Research, Minneapolis, MN, United States

Slots are introduced to the standard microstrip transmission line RF coil element, to enhance the current density and obtain better improved transmit efficiency. A prototype of such a slotted microstrip element is compared with the standard microstrip element at 297.25 MHz for 7T MR scanner to show the feasibility of the design at higher magnetic fields. A 60% improvement in the transmit efficiency and increased penetration of field into the phantom are observed experimentally. The B₁⁺ field distribution in both transverse and sagittal plane are shown for the comparison.

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