A specific absorption rate reduction method for simultaneous multislice magnetic resonance imaging

This study proposes a modified Shinnar–Le Roux method to synthesize the excitation radio frequency (RF) pulse for a 2D gradient echo (GRE) based simultaneous multi-slice (SMS) magnetic resonance imaging (MRI) with features of low specific absorption rate (SAR) and small out-of-slice ripple. This syn...

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Veröffentlicht in:Review of scientific instruments 2017-04, Vol.88 (4), p.043701-043701
Hauptverfasser: Wu, Fu-Hsing, Wu, Edzer L., Tung, Yi-Hang, Cheng, Po-Wei, Chiueh, Tzi-Dar, Chen, Jyh-Horng
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container_end_page 043701
container_issue 4
container_start_page 043701
container_title Review of scientific instruments
container_volume 88
creator Wu, Fu-Hsing
Wu, Edzer L.
Tung, Yi-Hang
Cheng, Po-Wei
Chiueh, Tzi-Dar
Chen, Jyh-Horng
description This study proposes a modified Shinnar–Le Roux method to synthesize the excitation radio frequency (RF) pulse for a 2D gradient echo (GRE) based simultaneous multi-slice (SMS) magnetic resonance imaging (MRI) with features of low specific absorption rate (SAR) and small out-of-slice ripple. This synthesis method for SMS RF pulses employs thinner slice bandwidth and lower multislice offset frequencies to reduce SAR values and adopts a weighted Parks–McClellan algorithm to reduce sidelobes. Formulas for estimating relative SAR values of the SMS pulses are also introduced. Relative SAR values and out-of-slice ripples of the proposed and typical RF pulses with different parameters are presented. In simultaneous 5-slice phantom and 3-slice human brain imaging, SMS pulses synthesized with the proposed method achieve 32% and 28% SAR values of standard pulses while providing similar image qualities. Typical RF pulses such as sinc x cos can also take advantage of the proposed method and offer lower SAR values for SMS imaging. The RF pulse synthesized using the proposed method features low SAR, small sidelobes, and consistent image quality for 2D GRE-based SMS MRI. This method is applicable to the synthesis of typical SMS RF pulses for significant SAR reduction.
doi_str_mv 10.1063/1.4979861
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Absorption
Brain
Image quality
Magnetic resonance imaging
Medical imaging
NMR
Nuclear magnetic resonance
Radio frequency
Scientific apparatus & instruments
Sidelobe reduction
Sidelobes
Synthesis
title A specific absorption rate reduction method for simultaneous multislice magnetic resonance imaging
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