A MR compatible mechatronic system to facilitate magic angle experiments in vivo

Elhawary, Haytham and Zivanovic, Aleksandar and Rea, Marc and Tse, Zion Tsz Ho and McRobbie, Donald and Young, Ian and Paley, Martyn and Davies, Brian L. and Lampérth, Michael (2007) A MR compatible mechatronic system to facilitate magic angle experiments in vivo. Lecture Notes in Computer Science, 4792 . pp. 604-611. ISSN 0302-9743

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Official URL: http://dx.doi.org/10.1007/978-3-540-75759-7_73

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Abstract

When imaging tendons and cartilage in a MRI scanner, an increase in signal intensity is observed when they are oriented at 55 degrees with respect to Bo (the “magic angle”). There is a clear clinical importance for considering this effect as part of the diagnosis of orthopaedic and other injury. Experimental studies of this phenomenon have been made harder by practical difficulties of tissue positioning and orientation in the confined environment of cylindrical scanners. An MRI compatible mechatronic system has been developed to position a variety of limbs inside the field of view of the scanner, to be used as a diagnostic and research tool. It is actuated with a novel pneumatic motor comprised of a heavily geared down air turbine, and is controlled in a closed loop using standard optical encoders. MR compatibility is demonstrated as well as the results of preliminary trials used to image the Achilles tendon of human volunteers at different orientations. A 4 to 13 fold increase in signal at the tendon is observed at the magic angle.

Item Type:Article
Additional Information:

Originally presented at the 10th international conference of Medical Image Computing and Computer-Assisted Intervention – MICCAI 2007 held in Brisbane October, 2007.

Research Areas:Middlesex University Schools and Centres > School of Science and Technology > Design Engineering and Mathematics
Citations on ISI Web of Science:1
ID Code:7990
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Deposited On:11 Jul 2011 13:20
Last Modified:04 Dec 2014 17:36

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