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000180528 1001_ $$00000-0001-7608-0869$$aAvdievich, Nikolai I$$b0
000180528 245__ $$aA 32-element loop/dipole hybrid array for human head imaging at 7 T.
000180528 260__ $$aNew York, NY [u.a.]$$bWiley-Liss$$c2022
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000180528 500__ $$a2022 Oct;88(4):1912-1926
000180528 520__ $$aTo improve whole-brain SNR at 7 Tesla, a novel 32-element hybrid human head array coil was developed, constructed, and tested.Our general design strategy is based on 2 major ideas: Firstly, following suggestions of previous works based on the ultimate intrinsic SNR theory, we combined loops and dipoles for improvement of SNR near the head center. Secondly, we minimized the total number of array elements by using a hybrid combination of transceive (TxRx) and receive (Rx) elements. The new hybrid array consisted of 8 folded-end TxRx-dipole antennas and 3 rows of 24 Rx-loops all placed in a single layer on the surface of a tight-fit helmet.The developed array significantly improved SNR in vivo both near the center (∼20%) and at the periphery (∼20% to 80%) in comparison to a common commercial array coil with 8 transmit (Tx) and 32 Rx-elements. Whereas 24 loops alone delivered central SNR very similar to that of the commercial coil, the addition of complementary dipole structures provided further improvement. The new array also provided ∼15% higher Tx efficiency and better longitudinal coverage than that of the commercial array.The developed array coil demonstrated advantages in combining complementary TxRx and Rx resonant structures, that is, TxRx-dipoles and Rx-loops all placed in a single layer at the same distance to the head. This strategy improved both SNR and Tx-performance, as well as simplified the total head coil design, making it more robust.
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000180528 650_7 $$2Other$$acentral SNR enhancement
000180528 650_7 $$2Other$$afolded-end dipole
000180528 650_7 $$2Other$$ahuman head array
000180528 650_7 $$2Other$$ahybrid array coil
000180528 650_7 $$2Other$$aultimate intrinsic SNR
000180528 650_7 $$2Other$$aultrahigh field MRI
000180528 7001_ $$aNikulin, Anton V$$b1
000180528 7001_ $$aRuhm, Loreen$$b2
000180528 7001_ $$0P:(DE-He78)5ceba3ebae6ecd5e27fa39a0365ff08e$$aMagill, Arthur W$$b3$$udkfz
000180528 7001_ $$00000-0003-3506-4947$$aGlang, Felix$$b4
000180528 7001_ $$aHenning, Anke$$b5
000180528 7001_ $$00000-0001-6316-8773$$aScheffler, Klaus$$b6
000180528 773__ $$0PERI:(DE-600)1493786-4$$a10.1002/mrm.29347$$gp. mrm.29347$$n4$$p1912-1926$$tMagnetic resonance in medicine$$v88$$x0740-3194$$y2022
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