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A silent echo-planar spectroscopic imaging readout with high spectral bandwidth MRSI using an ultrasonic gradient axis.
Versteeg, Edwin; Nam, Kyung Min; Klomp, Dennis W J; Bhogal, Alex A; Siero, Jeroen C W; Wijnen, Jannie P.
Afiliação
  • Versteeg E; Center for Image Sciences, Department of Radiology, University Medical Center Utrecht, Utrecht, The Netherlands.
  • Nam KM; Center for Image Sciences, Department of Radiology, University Medical Center Utrecht, Utrecht, The Netherlands.
  • Klomp DWJ; Center for Image Sciences, Department of Radiology, University Medical Center Utrecht, Utrecht, The Netherlands.
  • Bhogal AA; Center for Image Sciences, Department of Radiology, University Medical Center Utrecht, Utrecht, The Netherlands.
  • Siero JCW; Center for Image Sciences, Department of Radiology, University Medical Center Utrecht, Utrecht, The Netherlands.
  • Wijnen JP; Spinoza Centre for Neuroimaging, Amsterdam, Netherlands.
Magn Reson Med ; 91(6): 2247-2256, 2024 Jun.
Article em En | MEDLINE | ID: mdl-38205917
ABSTRACT

PURPOSE:

We present a novel silent echo-planar spectroscopic imaging (EPSI) readout, which uses an ultrasonic gradient insert to accelerate MRSI while producing a high spectral bandwidth (20 kHz) and a low sound level.

METHODS:

The ultrasonic gradient insert consisted of a single-axis (z-direction) plug-and-play gradient coil, powered by an audio amplifier, and produced 40 mT/m at 20 kHz. The silent EPSI readout was implemented in a phase-encoded MRSI acquisition. Here, the additional spatial encoding provided by this silent EPSI readout was used to reduce the number of phase-encoding steps. Spectroscopic acquisitions using phase-encoded MRSI, a conventional EPSI-readout, and the silent EPSI readout were performed on a phantom containing metabolites with resonance frequencies in the ppm range of brain metabolites (0-4 ppm). These acquisitions were used to determine sound levels, showcase the high spectral bandwidth of the silent EPSI readout, and determine the SNR efficiency and the scan efficiency.

RESULTS:

The silent EPSI readout featured a 19-dB lower sound level than a conventional EPSI readout while featuring a high spectral bandwidth of 20 kHz without spectral ghosting artifacts. Compared with phase-encoded MRSI, the silent EPSI readout provided a 4.5-fold reduction in scan time. In addition, the scan efficiency of the silent EPSI readout was higher (82.5% vs. 51.5%) than the conventional EPSI readout.

CONCLUSIONS:

We have for the first time demonstrated a silent spectroscopic imaging readout with a high spectral bandwidth and low sound level. This sound reduction provided by the silent readout is expected to have applications in sound-sensitive patient groups, whereas the high spectral bandwidth could benefit ultrahigh-field MR systems.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Ultrassom / Processamento de Imagem Assistida por Computador Limite: Humans Idioma: En Revista: Magn Reson Med Assunto da revista: DIAGNOSTICO POR IMAGEM Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Holanda

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Ultrassom / Processamento de Imagem Assistida por Computador Limite: Humans Idioma: En Revista: Magn Reson Med Assunto da revista: DIAGNOSTICO POR IMAGEM Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Holanda