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Magnetic Resonance Imaging

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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Magnetic Resonance Elastography Methodology for the Evaluation of Tissue Engineered Construct Growth

Magnetic Resonance Elastography Methodology for the Evaluation of Tissue Engineered Construct Growth

Published on: February 9, 2012

Magnetic resonance elastography using an air ball-actuator.

Tomokazu Numano¹, Yoshihiko Kawabata, Kazuyuki Mizuhara

¹Department of Radiological Science, Graduate School of Human Health Science, Tokyo Metropolitan University, Higashiogu, Arakawa-ku, Tokyo, Japan. t-numano@hs.tmu.ac.jp

Magnetic Resonance Imaging

|April 23, 2013

Summary

A novel pneumatic ball-vibrator actuator was developed for magnetic resonance elastography (MRE). This compact, MRI-compatible device generates adjustable vibrations, proving feasible for creating MR elastograms.

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Area of Science:

Biomedical Engineering
Medical Imaging
Physics

Background:

Magnetic Resonance Elastography (MRE) requires effective mechanical actuators to generate and detect tissue vibrations.
Existing MRE actuators can be bulky or complex, limiting their practical application.
MRI compatibility is crucial for actuators used in MRE to avoid image artifacts.

Purpose of the Study:

To develop a new, powerful, and compact actuator for MRE using a pneumatic ball-vibrator.
To ensure the actuator is MRI-compatible and easy to handle.
To validate the actuator's performance and feasibility in generating MR elastograms.

Main Methods:

A pneumatic ball-vibrator actuator was designed using non-ferromagnetic materials for MRI compatibility.
Vibration frequency and amplitude were controlled via air pressure and internal ball replacement.
Optical laser displacement sensors measured vibration amplitudes.
A four-channel optical-fiber sensor provided MRI trigger signals synchronized to vibration phase offsets.
The actuator was tested on an agarose gel phantom to generate an MR elastogram.

Main Results:

The actuator demonstrated consistent displacement across increasing vibration frequencies.
Vibration frequency and force were freely adjustable.
The system successfully generated an MR elastogram in an agarose gel phantom.
The optical-fiber sensor effectively provided MRI trigger signals.

Conclusions:

The developed pneumatic ball-vibrator is a feasible and effective actuator for MRE.
Its compact size, MRI compatibility, and adjustable parameters offer advantages for MRE applications.
This technology can advance the development of practical MRE systems.