Measurement of acoustic noise effect due to the gradient pulsing in functional magnetic resonance imaging (fMRI)

SungTaek Chung; Inchang Song; Hyun Wook Park

doi:10.1117/12.349531

28 May 1999 Measurement of acoustic noise effect due to the gradient pulsing in functional magnetic resonance imaging (fMRI)

SungTaek Chung, Inchang Song, Hyun Wook Park

Author Affiliations +

Proceedings Volume 3659, Medical Imaging 1999: Physics of Medical Imaging; (1999) https://doi.org/10.1117/12.349531
Event: Medical Imaging '99, 1999, San Diego, CA, United States

Abstract

In MRI, gradient magnetic fields are used to obtain the spatial information by frequency modulation of the received signal. The gradient fields are generated by switching currents on the gradient coils, which generates acoustic noise due to Lorentzian force. In particular, fast imaging methods, which are usually used for fMRI, require fast switching of the gradient pulse, thereby generating large acoustic noise. The intensity of the acoustic noise depends on the imaging method and the pulse sequences. The acoustic noise induced by gradient pulsing may interfere for signal enhancement of brain areas with the presentation of auditory stimuli during fMRI. In this paper, the gradient pulsing effects on fMRI are analyzed for different combinations of gradients. The experimental results show that total activations by visual stimulation are slightly larger for a combination of Z readout and Y phase-encoding gradients than those for a combination of Y readout and Z phase-encoding gradients when sagittal-view fMRI is performed.

Citation Download Citation

SungTaek Chung, Inchang Song, and Hyun Wook Park "Measurement of acoustic noise effect due to the gradient pulsing in functional magnetic resonance imaging (fMRI)", Proc. SPIE 3659, Medical Imaging 1999: Physics of Medical Imaging, (28 May 1999); https://doi.org/10.1117/12.349531

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