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.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:AEU.10048/1607 |
| Date | 06 1900 |
| Creators | Zhang, Chan |
| Contributors | Le, Lawrence H. (Radiology and Diagnostic Imaging), Lou, Edmond(Electronic and Computer Engineering), Le, Lawrence (Radiology and Diagnostic Imaging), Lou, Edmond(Electronic and Computer Engineering), Filipow, Larry (Radiology and Diagnostic Imaging) |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | 7687761 bytes, application/pdf |
| Relation | Edmond, Lou (2010).Research into Spinal Deformities 7, Studies in Health Technology and Informatics (IOS press, USA), Lawrence, H. Le (2010). 3rd international conference on the Development of Biomedical Engineering. Proceedings. Vietnam |
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