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Application of Ultrasound to Guide Pedicle Screw Insertion during Scoliosis Surgery: a Feasibility Study Open Access


Other title
Bone Imaging
Scoliosis Surgery
Type of item
Degree grantor
University of Alberta
Author or creator
Zhang, Chan
Supervisor and department
Le, Lawrence H. (Radiology and Diagnostic Imaging)
Lou, Edmond(Electronic and Computer Engineering)
Examining committee member and department
Lou, Edmond(Electronic and Computer Engineering)
Filipow, Larry (Radiology and Diagnostic Imaging)
Le, Lawrence (Radiology and Diagnostic Imaging)
Radiology and Diagnostic Imaging

Date accepted
Graduation date
Master of Science
Degree level
This thesis presents an experimental study of a bovine vertebra using transmission and pulse-echo methods and a preliminary investigation to guide a screw insertion into a pedicle using TomoScan phased array unit. The results show the cancellous bone has higher attenuation than the cortical bone for 1.0-5.0 MHz. The optimal frequencies for imaging are found to be 3.5 and 5.0 MHz. When the sample is filled with water with the cancellous core removed, all reflections from the layers and screw are visible; however when the core is present, only reflections from the top cortex are identifiable. For the preliminary study, size and placement of the transducer array are important. When the ultrasound beam is normal to the pedicle surface, echoes from the pedicle layers and the steel bit are strong; otherwise, signals are weak and not even identifiable. Larger aperture size will enhance the signal-to-noise ratio but deteriorate lateral resolution.
License granted by chan zhang ( on 2010-10-21T21:08:18Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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