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Abstract #4400

Densely-Populated Transceiver Surface Coil Array for the Human Brain Studies at 7 T.

Nikolai I. Avdievich1, Jullie W. Pan1, Hoby P. Hetherington1

1Neurosurgery, Yale University, New Haven, CT, United States

Transceiver surface coil arrays improve transmit performance and B1 homogeneity for head imaging up to 9.4T. Arrays with larger number of smaller elements further improve SNR and parallel imaging. Overlapping adjacent elements optimizes both the loading and the penetration depth, but complicates the decoupling. First, the adjacent coils generate substantial mutual resistance and cannot be decoupled using common methods, which compensate only for the mutual reactance. Second, in a densely-populated overlapped array, coupling exists between non-adjacent elements. We have developed a single-row (1x16) overlapped surface coil transceiver head array with decoupling of both the adjacent and the next-to-one neighboring elements.

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Keywords

adjacent amplitude array arrays away axial better brain capacitive circumscribing coil coils combination common compensate compensated complicates components compromise concept consisted consisting constructed coupling decoupled decoupling decrease demonstrating densely depth developed deviation direct drive elements entire evaluated evenly excellent exists facilitate generate good haven head height helps homogeneity human impedance improve indicating individual inductive length limited loaded loading located losses maintain maps measured mutual neighboring neurosurgery next novel overlap overlapped overlapping parallel partially penetration performance phantom populated previously prove radiation reactive reasonable rectangular reduced residual resistance resistive resonant shield shielded slice spaced strong studies substantial surface system transceiver transmit unloaded width