10.6084/m9.figshare.5669074.v1
Helena Aguiar Ribeiro Nascimento
Helena Aguiar Ribeiro
Nascimento
Marcos Ely Almeida Andrade
Marcos Ely Almeida
Andrade
Marco Antonio Gomes Frazão
Marco Antonio Gomes
Frazão
Eduarda Helena Leandro Nascimento
Eduarda Helena Leandro
Nascimento
Flavia Maria Moraes Ramos-Perez
Flavia Maria Moraes
Ramos-Perez
Deborah Queiroz Freitas
Deborah Queiroz
Freitas
Dosimetry in CBCT with Different Protocols: Emphasis on Small FOVs Including Exams for TMJ
SciELO journals
2017
cone-beam computed tomography
dosimetry
radiation exposure
temporomandibular joint.
2017-12-05 09:57:17
Dataset
https://scielo.figshare.com/articles/dataset/Dosimetry_in_CBCT_with_Different_Protocols_Emphasis_on_Small_FOVs_Including_Exams_for_TMJ/5669074
<div><p>Abstract This study aimed to estimate the absorbed dose in cone beam computed tomography (CBCT) exams according to different exposure parameters and size and position of the field of view (FOV). In addition was compared the absorbed dose of two smaller FOV scans with that of a larger FOV scan for evaluation of temporomandibular joint (TMJ), as it is a bilateral structure. CBCT scans were obtained on OP300 Maxio unit varying scanning mode (standard, high and endo) as well as size (5x5, 6x8 and 8x15 cm) and positioning of FOV. With a small FOV, different areas were scanned (maxilla or mandible, anterior or posterior and TMJ). Absorbed doses were determined using thermoluminescent dosimeters on the skin surface of sensitive organs of an anthropomorphic phantom. Endo mode showed the highest dose, followed by the high and standard modes in all FOV positions. With small FOV, doses were higher in the posterior region, especially in the mandible. Dose reduction occurred when small FOVs were used, but it was not proportional to FOV size reduction. For TMJ, the dose in a single acquisition with large FOV was greater than two acquisitions with small FOV, but lower than two acquisitions with medium FOV (6x8 cm). In conclusion, scanning mode, size and FOV position have great influence on the absorbed dose. Small FOV decreases the dose, but there is no linear relation between FOV size and dose. For bilateral exams of TMJ, double acquisition with small FOVs produces decrease in absorbed dose relative to a large FOV.</p></div>