Sinusoidal echo-planar imaging with parallel acquisition technique for reduced acoustic noise in auditory fMRI

Journal of Magnetic Resonance Imaging : JMRI
Jascha ZappLothar R Schad

Abstract

To extend the parameter restrictions of a silent echo-planar imaging (sEPI) sequence using sinusoidal readout (RO) gradients, in particular with increased spatial resolution. The sound pressure level (SPL) of the most feasible configurations is compared to conventional EPI having trapezoidal RO gradients. We enhanced the sEPI sequence by integrating a parallel acquisition technique (PAT) on a 3 T magnetic resonance imaging (MRI) system. The SPL was measured for matrix sizes of 64 × 64 and 128 × 128 pixels, without and with PAT (R = 2). The signal-to-noise ratio (SNR) was examined for both sinusoidal and trapezoidal RO gradients. Compared to EPI PAT, the SPL could be reduced by up to 11.1 dB and 5.1 dB for matrix sizes of 64 × 64 and 128 × 128 pixels, respectively. The SNR of sinusoidal RO gradients is lower by a factor of 0.96 on average compared to trapezoidal RO gradients. The sEPI PAT sequence allows for 1) increased resolution, 2) expanded RO frequency range toward lower frequencies, which is in general beneficial for SPL, or 3) shortened TE, TR, and RO train length. At the same time, it generates lower SPL compared to conventional EPI for a wide range of RO frequencies while having the same imaging parameters.

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Citations

Jun 21, 2015·Magma·Martin OttPeter M Jakob
Aug 12, 2014·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Federico De MartinoEssa Yacoub
Jan 11, 2017·Nature Communications·Ben DeenRebecca Saxe
Feb 20, 2020·Journal of Magnetic Resonance Imaging : JMRI·Beatriz Dionisio-ParraAna Beatriz Solana
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Jun 28, 2017·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Jana HutterJoseph V Hajnal
Feb 26, 2021·Journal of Magnetic Resonance Imaging : JMRI·Mark J McJury

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