Int J Med Robot - Piezoelectric actuator design for MR elastography: implementation and vibration issues.

Tópicos

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Resumo

CKGROUND: MR elastography (MRE) is an emerging technique for tumor diagnosis. MRE actuation devices require precise mechanical design and radiofrequency engineering to achieve the required mechanical vibration performance and MR compatibility.METHOD: A method of designing a general-purpose, compact and inexpensive MRE actuator is presented. It comprises piezoelectric bimorphs arranged in a resonant structure designed to operate at its resonant frequency for maximum vibration amplitude. An analytical model was established to understand the device vibration characteristics.RESULTS: The model-predicted performance was validated in experiments, showing its accuracy in predicting the actuator resonant frequency with an error < 4%. The device MRI compatibility was shown to cause minimal interference to a 1.5 tesla MRI scanner, with maximum signal-to-noise ratio reduction of 7.8% and generated artefact of 7.9 mm in MR images.CONCLUSIONS: A piezoelectric MRE actuator is proposed, and its implementation, vibration issues and future work are discussed.

Resumo Limpo

ckground mr elastographi mre emerg techniqu tumor diagnosi mre actuat devic requir precis mechan design radiofrequ engin achiev requir mechan vibrat perform mr compatibilitymethod method design generalpurpos compact inexpens mre actuat present compris piezoelectr bimorph arrang reson structur design oper reson frequenc maximum vibrat amplitud analyt model establish understand devic vibrat characteristicsresult modelpredict perform valid experi show accuraci predict actuat reson frequenc error devic mri compat shown caus minim interfer tesla mri scanner maximum signaltonois ratio reduct generat artefact mm mr imagesconclus piezoelectr mre actuat propos implement vibrat issu futur work discuss

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