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Piezoelectric actuator design for MR elastography: implementation and vibration issues.

Zion Tsz Ho Tse¹, Yum Ji Chan, Henning Janssen

¹Harvard Medical School, Radiology Department, Brigham and Women's Hospital, 221 Longwood Avenue, LM-010, Boston, MA 02115, USA. ziontse@bwh.harvard.edu.

The International Journal of Medical Robotics + Computer Assisted Surgery : MRCAS

|July 28, 2011

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A novel piezoelectric actuator for MR elastography (MRE) enables precise tumor diagnosis. This compact, inexpensive device demonstrates accurate vibration performance and MRI compatibility, crucial for advanced medical imaging.

Area of Science:

Biomedical Engineering
Medical Imaging Physics

Background:

MR elastography (MRE) is an advanced technique for tumor diagnosis.
MRE actuation devices require sophisticated mechanical and radiofrequency engineering for optimal performance and MR compatibility.

Purpose of the Study:

To present a design method for a general-purpose, compact, and cost-effective MRE actuator.
To analyze the vibration characteristics of the proposed actuator.

Main Methods:

Utilized piezoelectric bimorphs in a resonant structure for maximum vibration amplitude at resonant frequency.
Developed an analytical model to predict device vibration characteristics.
Validated model predictions through experimental testing.

Main Results:

Keywords:

MR compatible MR elastography device control vibration

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The analytical model accurately predicted actuator resonant frequency with <4% error.
The actuator exhibited minimal interference with a 1.5T MRI scanner.
Maximum signal-to-noise ratio reduction was 7.8%, with image artifacts measuring 7.9 mm.

Conclusions:

A piezoelectric MRE actuator was successfully designed and implemented.
The study discussed vibration characteristics and potential future research directions.