Imaging of the osseous structures of the temporomandibular joint is best accomplished using computed tomography (CT). Cone beam CT offers a reduced radiation dose and improved spatial resolution compared to multislice helical CT. This study evaluates comparative dosimetry for temporomandibular joint imaging using two different cone beam CT systems, the Hitachi CB MercuRay and Kodak 9000 3D. These systems demonstrate differing properties with respect to field-of view sizes, operational technique factors, and spatial resolution. The Kodak 9000 3D unit offers an effective radiation dose reduction of greater than ten-fold compared with the Hitachi CB MercuRay, depending on kVp and mA. A subsequent clinical study evaluating the effect of spatial resolution on the ability to detect osseous changes related to temporomandibular joint degenerative disease found no significant difference in diagnostic efficacy between high and low spatial resolution images, however, observers consistently associated high spatial resolution with superior image quality.
| Identifer | oai:union.ndltd.org:TORONTO/oai:tspace.library.utoronto.ca:1807/43096 |
| Date | 05 December 2013 |
| Creators | Lukat, Tricia |
| Contributors | Lam, Ernest W. |
| Source Sets | University of Toronto |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
Page generated in 0.0018 seconds