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Keywords:
Safety, MR, MR physics, Quality assurance
Authors:
T. Hamaguchi1, T. Miyati1, T. Matsushita2, N. Ohno1; 1Kanazawa/JP, 2Kyoto/JP
DOI:
10.1594/ecr2014/C-1988
Aims and objectives
Acoustic noise during magnetic resonance imaging (MRI) scan can not only cause anxiety,
stress,
and annoyance but also cause a temporary or permanent shift in the hearing threshold [1].
Studies have described that this sound affects the results of functional MRI [2].
In addition,
the noise interferes with verbal communication and pediatric imaging.
The noise is primarily caused by Lorenz forces (F) induced in the scanner while electric currents (I) are switched in the gradient coils within the static magnetic field (B0) (figure 1).
![](https://epos.myesr.org/posterimage/esr/ecr2014/120906/media/549003?maxheight=300&maxwidth=300)
Fig. 1: Acoustic noise during MRI scan is primarily caused by Lorenz forces (F) induced in the scanner while electric currents (I) are switched in the gradient coils within the static magnetic field (B0).
Acoustic noise transfer function can evaluate the noise properties of an MRI system itself,
independently of pulse sequences and imaging parameters [3].
The acoustic noise transfer function may vary depending on the measurement positions (corresponding to the patient positions) as well as the MRI systems.
Therefore,
the present study aimed to evaluate the spatial dependence of gradient-pulse-to-acoustic-noise transfer function (GPAN-TF) among different MRI systems.