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A fast, analytically-based method to optimize local transmit efficiency for a transmit array

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Title: A fast, analytically-based method to optimize local transmit efficiency for a transmit array
Author(s): Carluccio, Giuseppe; Collins, Cristopher; Erricolo, Danilo
Subject(s): Radiofrequency magnetic resonance imaging shimming power specific absorption rate spectroscopy
Abstract: Purpose: to develop an analytically-based algorithm for rapid optimization of the local RF magnetic (B_1^+) field intensity for a given RF power through a transmit array. The analytical nature of the method will yield insight to optimization requirements and provides a valuable reference for numerically-based searches. Materials and Methods: with knowledge of the B_1^+ field distribution generated by each single coil of the array, both the phases and the amplitudes of each coil current are optimized to maximize the magnitude of the B_1^+ field in a specific location of the body per unit of power transmitted through the array and, consequently, minimizing the whole body SAR for a given pulse sequence. Results: simulations considering the human body show that the proposed method can reduce the whole body SAR for a given B1+ magnitude at the location of interest by a factor of about 6.3 compared to the classic birdcage current configuration, and by a factor of 3.2 compared to phase only shimming in a case with significant coupling between the elements of the array. Conclusion: the proposed method can rapidly provide valuable information pertinent to the optimization of field distributions from transmit arrays.
Issue Date: 2013-02-14
Publisher: Wiley Periodicals Inc.
Citation Info: Carluccio, Giuseppe, Cristopher Collins, and Danilo Erricolo. "A fast, analytically-based method to optimize local transmit efficiency for a transmit array." Magnetic Resonance in Medicine. 71.1 (2013): 432-439. doi: 10.1002/mrm.24653
Type: Article
Description: The definitive version is available at www3.interscience.wiley.com doi:10.1002/mrm.24653
URI: http://hdl.handle.net/10027/11017
ISSN: 0740-3194
Date Available in INDIGO: 2014-01-09
 

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