(ISMRM 2024) Effect of the RF shield-to-coil distance on coil efficiency for a 46 mT Halbach-based point-of-care MRI system
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Abstract #2839

Effect of the RF shield-to-coil distance on coil efficiency for a 46 mT Halbach-based point-of-care MRI system

Javad Parsa1 and Andrew Webb2
1Leiden University Medical Center, Leiden, Netherlands, 2Radiology, Leiden University Medical Center, Leiden, Netherlands

Synopsis

Keywords: Low-Field MRI, Simulations

Motivation: Inner-Shield in Halbach-array magnet effect RF coil transmit efficiency and signal-to-noise ratio(SNR). With this, finding a good trade of between magnet diameter and SNR is important.

Goal(s): Find the proper magnet diameter with respect to the RF coil transmit efficiency.

Approach: Simulations of the transmit efficiency of three RF coils used for neuroimaging on a 46 mT Halbach-array point-of-care MRI system have been performed in terms of analyzing the coil to RF shield distance located inside the magnet.

Results: Results show that a distance of 1 cm results in a 50% lower transmit/receive efficiency than a 3 cm gap.

Impact: This means that slightly larger magnets may have higher signal-to-noise even though the B0 field is lower.

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