B < sub > 1 < /sub > < sup > + < /sup > phase retrieval for non-quadrature radio frequency excitation and its preliminary application in MR-EPT.

In this study, we propose a simple method to acquire the absolute transmit phase in non-quadrature excitation with an eight channel transceiver TEM array for 3 T. The proposed method requires the application of a single additional quadrature drive in order to get the receive phases of the individual channels of the transceiver coil. These receive phases are then subtracted from the transceive phase of the non-quadrature drive experiment to acquire its transmit phase. The developed ideas are tested in the framework of simulations and MRI experiments with the use of four different non-quadrature drive configurations. It has been observed that the simulated and experimentally acquired transmit phase distributions tend to have a strong consensus which supports the validity of the proposed method. Finally, the estimated transmit phase distribution of non-quadrature drive is used in the standard MR-EPT study to get the conductivity reconstructions in order for the validation of its eligibility in MR-EPT studies.
PMID: 30537691 [PubMed - as supplied by publisher]

Source: Physics in Medicine and Biology - December 11, 2018 Category: Physics Authors: Ariturk G, Ider YZ Tags: Phys Med Biol Source Type: research