SciELO - Scientific Electronic Library Online

 
vol.15 número5Imagens em 2D e 3D geradas pela TC Cone-Beam e radiografias convencionais: qual a mais confiável?Medidas lineares dos estágios de desenvolvimento da dentição permanente humana usando Tomografia Computadorizada de Feixe Cônico: um estudo preliminar índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Dental Press Journal of Orthodontics

versão impressa ISSN 2176-9451

Resumo

TORRES, Marianna Guanaes Gomes et al. Evaluation of referential dosages obtained by Cone-Beam Computed Tomography examinations acquired with different voxel sizes. Dental Press J. Orthod. [online]. 2010, vol.15, n.5, pp.42-43. ISSN 2176-9451.  http://dx.doi.org/10.1590/S2176-94512010000500008.

Objectives: The aim of this study was to evaluate the dose-area product (DAP) and the entrance skin dose (ESD), using protocols with different voxel sizes, obtained with i-CAT Cone-Beam Computed Tomography (CBCT), to determine the best parameters based on radioprotection principles. METHODS: A pencil-type ionization chamber was used to measure the ESD and a PTW device was used to measure the DAP. Four protocols were tested: (1) 40s, 0.2 mm voxel and 46.72 mAs; (2) 40s, 0.25 mm voxel and 46.72 mAs; (3) 20s, 0.3 mm voxel and 23.87 mAs; (4) 20s, 0.4 mm voxel and 23.87 mAs. The kilovoltage remained constant (120kVp). RESULTS: A significant statistical difference (p<0.001) was found among the four protocols for both methods of radiation dosage evaluation (DAP and ESD). For DAP evaluation, protocols 2 and 3 presented a statistically significant difference, and it was not possible to detect which of the protocols for ESD evaluation promoted this result. CONCLUSIONS: DAP and ESD are evaluation methods for radiation dose for Cone-Beam Computed Tomography, and more studies are necessary to explain such result. The voxel size alone does not affect the radiation dose in CBCT (i-CAT) examinations. The radiation dose for CBCT (i-CAT) examinations is directly related to the exposure time and milliamperes.

Palavras-chave : Cone-Beam Computed Tomography; Radiation; Voxel.

        · resumo em Português     · texto em Português | Inglês     · Português ( pdf epdf ) | Inglês ( pdf epdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons