Meeting Banner
Abstract #0350

Butler matrix transmit channel compression in pTx: a SAR-aware study.

Mihir Rajendra Pendse1, Riccardo Stara1,2,3, Gianluigi Tiberi4, Alessandra Retico2, Michela Tosetti5, and Brian Rutt1

1Stanford University, Stanford, CA, United States, 2Istituto Nazionale di Fisica Nucleare (Pisa), Pisa, Italy, 3Universita' di Pisa, Pisa, Italy, 4IMAGO7, Pisa, Italy, 5ISRCC Stella maris, Calambrone (Pisa), Italy

The use of a Butler matrix in pTx is thought to allow transmit channel compression by a factor of 2 or more compared to direct drive, while maintaining similar flip angle control. However, the SAR-related consequences of this compression strategy are relatively unexplored. Using a SAR-aware pTx design method (IMPULSE), we demonstrate that excellent flip angle uniformity is indeed possible using only 2 or 4 Butler modes compared to 8 direct drive channels; however, this comes at the expense of increased SAR. We also present a generalized strategy for selecting the optimal subset of Butler modes, i.e. the subset that provides adequate flip angle control at minimum SAR.

This abstract and the presentation materials are available to members only; a login is required.

Join Here