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MRI SCANNER VIBRATION PATH ANALYSIS
Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
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2013 (English)In: Machinery Noise and Vibration, 2013, 725Conference paper, (Other academic)
Abstract [en]

Magnetic Resonance Imaging (MRI) scanner is one of the most important tools in clinical diagnostics. MRI scanners are associated by strong vibration which results in unpleasant and disturbing acoustic noise. The primary source of this vibration is the Lorentz force produced by fast switching of the currents inside the gradient coils of MRI scanners under a strong static magnetic field. During an MR-imaging scan the switching is controlled in order to spatially code the hydrogen nuclei that will generate the signal, which is reconstructed into anatomical images. Faster switching of the currents allows for shorter scan times and/or higher image resolutions. Consequently, the clinical quality has motivated the drive for shorter switching time and higher currents. This development, however, has also caused an undesired increase of MRI vibrations. The overall vibration phenomenon of an installed fully functional MRI scanner system becomes unique because of the installed location and ambiance. This vibration can potentially degrade the image quality and hence the diagnosis. Apart from the vibration produced, the associated annoying acoustic noise may not only affect the patients under examination and the clinical staff, but may also be transmitted to other parts of the building and causing discomfort for the personnel working there. In order to devise an effective isolation plan or improve an existing one both for vibration and acoustic noise it is important to study the noise and vibration transfer paths. This paper concerns an investigation of vibration transfer paths for vibration excited by an installed functional MRI scanner at a medical facility. The vibration transfer paths have been investigated experimentally. The obtained results are presented and discussed.

Place, publisher, year, edition, pages
2013. 725
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:bth-13808OAI: oai:DiVA.org:bth-13808DiVA: diva2:1067618
Conference
The 20th International Congress on Sound and Vibration (ICSV20), Bangkok
Available from: 2017-01-22 Created: 2017-01-22 Last updated: 2017-01-31Bibliographically approved
In thesis
1. Measurements, Analysis Techniques and Experiments in Sound and Vibration: Applied to Operational MRI Scanners and in Remote Laboratories.
Open this publication in new window or tab >>Measurements, Analysis Techniques and Experiments in Sound and Vibration: Applied to Operational MRI Scanners and in Remote Laboratories.
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

High quality noise and vibration measurements outside of a laboratory environment on real life structures and applications are not trivial. True boundary and operating conditions enforce unique challenges on the measurements. Measurements in hazardous situations such as high magnetic fields, and high temperature environments, etc., where ordinary measurement equipment and methods may not be employed, require further precautions. Post measurements objectives such as analysis, design and strategic decisions, e.g., control, rely heavily on the quality and integrity of the measurements (data).

The quality of the experimental data is highly correlated with the on-field expertise. Practical or hands-on experience with measurements can be imparted to prospective students, researchers and technicians in the form of laboratory experiments involving real equipment and practical applications. However, achieving expertise in the field of sound and vibration measurements in general and their active control in particular is a time consuming and expensive process. Consequently most institutions can only afford a single setup, resulting in the compromise of the quality of expertise.

In this thesis, the challenges in the field of sound and vibration measurements in high magnetic field are addressed. The analysis and measurement of vibration transferred from an operational magnetic resonance imaging (MRI) scanner to adjacent floors is taken as an example. Improvised experimental measurement methods and custom-made frequency analysis techniques are proposed in order to address the challenges and study the vibration transfer. The methods may be extended to other operational industrial machinery and hazardous environments. To encourage and develop expertise in the field of acoustic/vibration measurements and active noise control on practical test beds, remotely controlled laboratory setups are introduced. The developed laboratory setup, which is accessed and controlled via the Internet, is the first of its kind in the active noise control and acoustic measurements area. The laboratory setup can be shared and utilized 24/7 globally, thus reducing the associated costs and eliminating time restrictions.

Place, publisher, year, edition, pages
Blekinge Tekniska Högskola, 2017. 251 p.
Series
Blekinge Institute of Technology Doctoral Dissertation Series, ISSN 1653-2090 ; 3
Keyword
Active Noise Control, Remote Laboratories, Sound and Vibration Measurements, Vibration Analysis, Vibration Transmission
National Category
Signal Processing
Identifiers
urn:nbn:se:bth-13821 (URN)978-91-7295-336-9 (ISBN)
Public defence
2017-02-22, 10:00 (English)
Opponent
Supervisors
Available from: 2017-02-01 Created: 2017-01-24 Last updated: 2017-03-08Bibliographically approved

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