The suppression of selected acoustic frequencies in MRI

Shou, Xingxian; Chen, Xin; Derakhshan, Jamal J.; Eagan, T. P.; Baig, Tanvir; Shvartsman, S. M.; Duerk, Jeffrey L.; Brown, Robert W.

doi:10.1016/j.apacoust.2009.08.005

Cited by 13 publications

(6 citation statements)

References 16 publications

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“…The ANC system offers an effective technique for reducing MRI noise. The application of ANC to MRI noise has been reported in [237][238][239][240][241][242][243][244][245][246], and an approximately 15-30 dB noise reduction has been achieved. However, these studies have some limitations.…”

Section: C) Mri Anc Systemsmentioning

confidence: 99%

Recent advances on active noise control: open issues and innovative applications

Kajikawa

Gan

Kuo

2012

SIP

296

113

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The problem of acoustic noise is becoming increasingly serious with the growing use of industrial and medical equipment, appliances, and consumer electronics. Active noise control (ANC), based on the principle of superposition, was developed in the early 20th century to help reduce noise. However, ANC is still not widely used owing to the effectiveness of control algorithms, and to the physical and economical constraints of practical applications. In this paper, we briefly introduce some fundamental ANC algorithms and theoretical analyses, and focus on recent advances on signal processing algorithms, implementation techniques, challenges for innovative applications, and open issues for further research and development of ANC systems.

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Section: C) Mri Anc Systemsmentioning

confidence: 99%

Recent advances on active noise control: open issues and innovative applications

Kajikawa

Gan

Kuo

2012

SIP

296

113

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“…In practice, follow‐on gradient pulses would generally aim to reduce the impact of a small set of dominant gradient modes and some of their harmonics. Initial results based on canceling three gradients modes, resulted in modest acoustic noise attenuation of 13 dB 66 …”

Section: Acoustic Noise Control Techniquesmentioning

confidence: 99%

Acoustic Noise and Magnetic Resonance Imaging: A Narrative/Descriptive Review

McJury

2021

Magnetic Resonance Imaging

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“…x n e (6) where N FFT represents the number of the points processed by FFT for calculation of the shorttime spectrum X(f, n). The enhanced speech spectrum can be obtained by subtracting the noise magnitude spectrum (recorded by the microphone Mic.…”

Section: Two-channel Noise Reduction Based On Spectral Subtractionmentioning

confidence: 99%

“…There exist several approaches to reduce the acoustic noise produced during MRI scanning [5][6][7]. In our case, the tested person is lying and articulating in the scanning area of the MRI equipment while the scanning MR sequence is running to obtain an MR image of the human vocal tract.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Acoustic Noise and its Suppression in Speech Recorded During Scanning in the Open-Air MRI

Přibil¹,

Přibilová²,

Frollo³

2016

Advances in Noise Analysis, Mitigation and Control

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The paper focuses on describing three methods of noise reduction in the speech signal recorded in an open-air magnetic resonance imager (MRI) working in a weak magnetic field during human phonation for the vocal tract modelling. This paper also analyses and compares spectral properties of the acoustic noise produced by mechanical vibration of the MRI device gradient coils. Then, the experiment with mapping of noise sound pressure level (SPL) in the MRI neighbourhood is described. The changes in acoustic noise spectral properties caused by loading of the holder of the lower gradient coils by the weight of the examined person lying in the scanning area of the MRI device is evaluated too. The influence of setting of the basic scan parameters of the used MR sequence (TR and TE times) on the spectral properties of the generated acoustic noise is also analysed. The results achieved are used to create a database of initial MR scan parameters such as the filter bank for noise signal pre-processing and to design a correction filter for noise suppression in the speech signal recorded simultaneously with three-dimensional (3D) human vocal tract scanning.

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The suppression of selected acoustic frequencies in MRI

Cited by 13 publications

References 16 publications

Recent advances on active noise control: open issues and innovative applications

Recent advances on active noise control: open issues and innovative applications

Acoustic Noise and Magnetic Resonance Imaging: A Narrative/Descriptive Review

Analysis of Acoustic Noise and its Suppression in Speech Recorded During Scanning in the Open-Air MRI

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