An Active Noise Cancellation System for fMRI

Author

Cho, Kuan-Hung ; Chiueh, Tzi-Dar ; Lin, Ching-Po ; Chen, Casper K. ; Chen, Jyh-Horng

Author_Institution

Nat. Taiwan Univ., Taipei

fYear

2007

fDate

12-14 Oct. 2007

Firstpage

265

Lastpage

267

Abstract

MRI acoustic noise could be high up to 120 dB while acquiring images with high speed echo planar imaging (EPI). It reaches the hearing limit of human and also impedes the research of functional MRI. In this research, an active noise cancellation (ANC) system was implemented using a filtered-x recursive least-square (FXRLS) filter and combined with passive noise cancellation to reduce the noise from EPI. Further, the visual fMRI experiments were performed with and without the ANC system. Our results showed extra 9.4 dB reduction was obtained by active noise cancellation at the main frequency of EPI noise. Besides, the fMRI results showed 140% activated pixel numbers increased.

Keywords

biomedical MRI; image denoising; least squares approximations; medical image processing; active noise cancellation; echo planar imaging; fMRI; filtered-x recursive least-square filter; Acoustic imaging; Acoustic noise; Active noise reduction; Auditory system; Frequency; Humans; Impedance; Magnetic resonance imaging; Noise cancellation; Passive filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Noninvasive Functional Source Imaging of the Brain and Heart and the International Conference on Functional Biomedical Imaging, 2007. NFSI-ICFBI 2007. Joint Meeting of the 6th International Symposium on

Conference_Location

Hangzhou

Print_ISBN

978-1-4244-0949-5

Electronic_ISBN

978-1-4244-0949-5

Type

conf

DOI

10.1109/NFSI-ICFBI.2007.4387747

Filename

4387747