Influence of anatomical location on CT numbers in cone beam computed tomography

• Autor(a) principal: Oliveira, Matheus L.
• Data de Publicação: 2013
• Outros Autores: Tosoni, Guilherme Monteiro [UNESP], Lindsey, David H., Mendoza, Kristopher, Tetradis, Sotirios, Mallya, Sanjay M.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.oooo.2013.01.021; http://hdl.handle.net/11449/74937
• topic: hydroxyapatite; phosphate; potassium derivative; potassium dihydrogen phosphate; chemistry; comparative study; cone beam computed tomography; equipment; human; image processing; image quality; incisor; molar tooth; premolar tooth; radiation dose; radiation scattering; radiography; statistics; three dimensional imaging; tooth arch; tooth socket; X ray; Bicuspid; Cone-Beam Computed Tomography; Dental Arch; Durapatite; Humans; Image Processing, Computer-Assisted; Imaging, Three-Dimensional; Incisor; Molar; Phantoms, Imaging; Phosphates; Potassium Compounds; Radiation Dosage; Scattering, Radiation; Tooth Socket; X-Rays

Objective: To assess the influence of anatomical location on computed tomography (CT) numbers in mid- and full field of view (FOV) cone beam computed tomography (CBCT) scans. Study Design: Polypropylene tubes with varying concentrations of dipotassium hydrogen phosphate (K2HPO4) solutions (50-1200 mg/mL) were imaged within the incisor, premolar, and molar dental sockets of a human skull phantom. CBCT scans were acquired using the NewTom 3G and NewTom 5G units. The CT numbers of the K2HPO 4 phantoms were measured, and the relationship between CT numbers and K2HPO4 concentration was examined. The measured CT numbers of the K2HPO4 phantoms were compared between anatomical sites. Results: At all six anatomical locations, there was a strong linear relationship between CT numbers and K2HPO4 concentration (R 2 > 0.93). However, the absolute CT numbers varied considerably with the anatomical location. Conclusion: The relationship between CT numbers and object density is not uniform through the dental arch on CBCT scans. © 2013 Elsevier Inc.