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Could Image Processing Enable Reduced Acoustic Noise during MRI Scans?


Jackson, JM and Forbes, LK and While, PT and Brideson, MA, Could Image Processing Enable Reduced Acoustic Noise during MRI Scans?, Concepts in Magnetic Resonance. Part B: Magentic Resonance Engineering, 39B, (4) pp. 191-205. ISSN 1552-504X (2011) [Refereed Article]

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DOI: doi:10.1002/cmr.b.20208


Magnetic resonance imaging (MRI) coils are typically associated with high acoustic noise levels, which can pose problems for the patient and attending medical staff. Lorentz forces are generated by gradient coils, which are switched rapidly. The Lorentz forces displace the coil former and promote a pressure wave that is responsible for acoustic noise up to 130 dB. The high noise levels are an unavoidable consequence of requiring the gradient coils to generate highly homogeneous linear magnetic fields. However, in this article, we present a mathematical method for designing coils that achieve a drastic reduction in noise level by deliberately sacrificing field linearity. We show that useful images can nevertheless be obtained from the nonlinear fields associated with these quiet coils. Examples are given that demonstrate the robustness of the method.

Item Details

Item Type:Refereed Article
Keywords:gradient coil; acoustic noise reduction; Tikhonov regularization; image processing
Research Division:Mathematical Sciences
Research Group:Applied mathematics
Research Field:Applied mathematics not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the mathematical sciences
UTAS Author:Jackson, JM (Mr James Jackson)
UTAS Author:Forbes, LK (Professor Larry Forbes)
UTAS Author:While, PT (Dr Peter While)
UTAS Author:Brideson, MA (Dr Michael Brideson)
ID Code:74280
Year Published:2011
Web of Science® Times Cited:3
Deposited By:Mathematics and Physics
Deposited On:2011-11-17
Last Modified:2012-05-15

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