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Actuators 2017, 6(2), 20;

Measuring the Temperature Increase of an Ultrasonic Motor in a 3-Tesla Magnetic Resonance Imaging System

Institute of Biomaterials and Biomedical Engineering, University of Toronto, Rosebrugh Building, 164 College Street, Room 407, Toronto, ON M5S3G9, Canada
Division of Neurosurgery, The Hospital for Sick Children, 555 University Avenue, Room 1504, Toronto, ON M5G1X8, Canada
Department of Mechanical and Industrial Engineering, University of Toronto, 5 King’s College Road, Room 106, Toronto, ON M5S3G8, Canada
Author to whom correspondence should be addressed.
Academic Editor: Delbert Tesar
Received: 18 January 2017 / Revised: 29 May 2017 / Accepted: 29 May 2017 / Published: 6 June 2017
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This paper aims to evaluate the temperature increase caused by a 3.0-T magnetic resonance imaging (MRI) system on an ultrasonic motor (USM) used to actuate surgical robots in the MRI environment. Four fiber-optic temperature sensors were attached to the USM. Temperature was monitored outside the five-Gauss boundary and then inside the bore for 20 min while the USM was powered on. The USM temperature was tested for two states of the scanner, “off” and “on”, by employing common clinical imaging sequences and echo planar imaging sequences. The USM showed a slight temperature increase while operating in the static field of the MRI. A considerable temperature increase (~10 °C) was observed when the scanner was on. The temperature increased to 60 °C, which is beyond the acceptable safe temperature and can result in thermal burns. Most of the temperature increase (80%) was due to effects of the static field on the motion of the rotating parts of the motor, while the remainder (20%) derived from heat deposited in the conductive components of the USM due to radiofrequency pulses and gradient field changes. To solve the temperature increase, the metal components of the USM’s case can be replaced by silicon carbide. View Full-Text
Keywords: MRI-compatibility; ultrasonic motor; temperature increase; safety; robotic surgery MRI-compatibility; ultrasonic motor; temperature increase; safety; robotic surgery

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Shokrollahi, P.; Drake, J.M.; Goldenberg, A.A. Measuring the Temperature Increase of an Ultrasonic Motor in a 3-Tesla Magnetic Resonance Imaging System. Actuators 2017, 6, 20.

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