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Variability In Selecting Lateral Cephalometric Landmarks In Two Cbct Image Modes, Dana Nguyen
Variability In Selecting Lateral Cephalometric Landmarks In Two Cbct Image Modes, Dana Nguyen
Loma Linda University Electronic Theses, Dissertations & Projects
Purpose: The purpose of this study was to determine the variability of lateral cephalometric landmark selection in two cone beam computed tomography (CBCT) lateral cephalometric simulations: 1) a mean projection image (MPI) and 2) a serial sagittal slice image (SSSI).
Methods: A MPI is a two-dimensional (2D) image obtained from the NewTom 3GTM CBCT that resembles the conventional lateral cephalogram. A SSSI is a 2D image also obtained from CBCT data, but is created by superimposing a series of selected thin sagittal slices containing the required cephalometric landmarks. This study compared the Ricketts and Steiner analysis of the MPI …
Influence Of Common Orthodontic Appliances On Magnetic Resonance Imaging, Joseph Matthew Elison
Influence Of Common Orthodontic Appliances On Magnetic Resonance Imaging, Joseph Matthew Elison
Loma Linda University Electronic Theses, Dissertations & Projects
Magnetic resonance imaging (MRI) is an essential diagnostic tool in modern medicine. Conditions such as cerebral vascular accidents, epilepsy and other seizure disorders, autism, cancer, migraine and cluster headaches benefit from its use. It has been discovered that 4-10% of all children and adolescents will experience a seizure at some point (Hauser, 1994) and MRI is one of the most common imaging modalities for seizure and epilepsy diagnosis. Unfortunately, some orthodontic materials cause distortion on MR images. Radiologists would probably require the removal of any distortion-causing orthodontic appliance prior to MR imaging. It is questionable whether radiologists would be comfortable …