Abstract #5457

Spatial analysis of acoustic noise transfer function: is the noise level increased by the presence of a patient inside the imager bore during MRI?

Takashi Hamaguchi¹, Tosiaki Miyati², Naoki Ohno², Tatsuhiko Matsushita³, Masanori Ozaki⁴, Tetsuya Minami⁵, Wataru Kouda⁵, and Toshifumi Gabata⁵

¹Department of Radiology, Kanazawa University Hospital, Kanazawa, Japan, ²Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan, ³Department of Radiology, Kyoto University Hospital, Kyoto, Japan, ⁴MR Engineering, GE Healthcare Japan, Hino, Japan, ⁵Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan

The purpose of our study was to evaluate the spatial distribution of a gradient-pulse-to-acoustic-noise transfer function (GPAN-TF) with and without a phantom inside the bore. This study showed that the spatial distribution of GPAN-TFs with a phantom in the bore was significantly larger than that with an empty imager. The GPAN-TF spectrum for high frequency range were increased by the phantom. Therefore, the patient would be exposed to a more unpleasant sound than conventional evaluation in an empty scanner. The multipoint analysis using GPAN-TFs revealed structural differences in respective gradient coils under a situation similar to actual MR examination.

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