Medical College of Wisconsin
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Radiofrequency pulse design with numerical optimization in the Fourier domain. MAGMA 2016 Jun;29(3):313-7

Date

02/24/2016

Pubmed ID

26902919

DOI

10.1007/s10334-016-0530-y

Scopus ID

2-s2.0-84959146076 (requires institutional sign-in at Scopus site)   1 Citation

Abstract

OBJECTIVE AND METHODS: A radiofrequency (RF) pulse design technique is presented that uses iterative constrained minimization to determine Fourier domain coefficients for an optimal time domain RF pulse. The design of new RF pulses is especially beneficial for field strengths of 7.0 T and above, where challenges pertaining to specific absorption rate (SAR) are exacerbated.

RESULTS AND CONCLUSION: A pair of 90° and 180° spin-echo pulses was designed to lower SAR without the need for a variable slice gradient. The optimized pulses were deployed to a 7.0 T human scanner to demonstrate a reduction in SAR while retaining signal-to-noise (SNR) ratio.

Author List

Huettner AM, Nencka AS

Author

Andrew S. Nencka PhD Center Director, Professor in the Radiology department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Algorithms
Brain
Echo-Planar Imaging
Fourier Analysis
Humans
Image Enhancement
Image Interpretation, Computer-Assisted
Magnetic Resonance Imaging
Models, Theoretical
Radio Waves
Signal-To-Noise Ratio
Software