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Acoustic noise transfer function in clinical MRI a multicenter analysis.

Takashi Hamaguchi1, Tosiaki Miyati, Naoki Ohno

  • 1Kanazawa University, Kodatsuno, Ishikawa, Japan.

Academic Radiology
|December 15, 2010
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Magnetic resonance imaging (MRI) acoustic noise characteristics were analyzed using a gradient-pulse-to-acoustic-noise transfer function (GPAN-TF). Higher frequencies and 3.0-T MRI scanners exhibited greater GPAN-TF, offering detailed noise insights.

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Area of Science:

  • Medical Imaging Physics
  • Acoustics
  • Biomedical Engineering

Background:

  • Acoustic noise in Magnetic Resonance Imaging (MRI) is influenced by imaging parameters, pulse sequences, scanner hardware, and magnetic field strength.
  • Understanding MRI acoustic noise is crucial for patient comfort and safety, as well as for optimizing imaging protocols.
  • Previous studies have focused on overall noise levels, but detailed frequency-dependent characteristics remain less explored.

Purpose of the Study:

  • To characterize acoustic noise independent of specific MRI scan protocols.
  • To evaluate the gradient-pulse-to-acoustic-noise transfer function (GPAN-TF) across various MRI systems.
  • To investigate the relationship between magnetic field strength and acoustic noise properties.

Main Methods:

  • Measurements of sound pressure levels in the frequency domain were conducted on MRI systems with static magnetic field strengths of 0.4-T, 1.5-T, and 3.0-T.
  • A simple trapezoidal gradient pulse was applied to each system.
  • The GPAN-TF was calculated for each gradient coil (X, Y, Z axes) using deconvolution.

Main Results:

  • The GPAN-TF was significantly higher in the high-frequency range (1000-10,000 Hz) compared to low frequencies across most MRI scanners.
  • Higher static magnetic field strengths (3.0-T) demonstrated a larger GPAN-TF at high frequencies (>1000 Hz) than 0.4-T and 1.5-T systems.
  • Vacuum chambers in MRI scanners reduced GPAN-TF at lower frequencies, but this effect diminished at higher frequencies.

Conclusions:

  • GPAN-TF analysis provides a detailed method for assessing acoustic noise properties in MRI scanners.
  • The findings highlight the impact of magnetic field strength and frequency on MRI-generated noise.
  • This approach can aid in developing strategies to mitigate acoustic noise in MRI environments.