title: Dosimetric study of mandible examinations performed with three cone-beam computed tomography scanners.
abstract: The objective of this work was to evaluate the air kerma-area product (PKA) and the skin absorbed dose in the region of the eyes, salivary glands and thyroid of the patient from mandible examinations performed with three cone-beam computed tomography (CBCT) scanners, i.e. i-CAT classic, Gendex CB-500 and PreXion 3D. For the dosimetric evaluation, an anthropomorphic head phantom (model RS-250) was used to simulate an adult patient. The CBCT examinations were performed using standard and high-resolution protocols for mandible acquisitions for adult patients. During the phantom's exposure, the PKA was measured using an ionising chamber and the absorbed doses to the skin in the region of the eyes, thyroid and salivary glands were estimated using thermoluminescence dosemeters (TLDs) positioned on the phantom's surface. The PKA values estimated with the CBCT scanners varied from 26 to 138 µGy m(2). Skin absorbed doses in the region of the eyes varied from 0.07 to 0.34 mGy; at the parotid glands, from 1.31 to 5.93 mGy; at the submandibular glands, from 1.41 to 6.86 mGy; and at the thyroid, from 0.18 to 2.45 mGy. PKA and absorbed doses showed the highest values for the PreXion 3D scanner due to the use of the continuous exposure mode and a high current-time product.
authors.affiliation: Departament of Nuclear Energy, Federal University of Pernambuco, Recife, PE, Brazil hjkhoury@gmail.com.
authors.forename: Helen J
authors.initials: HJ
authors.lastname: Khoury
authors.affiliation: Departament of Nuclear Energy, Federal University of Pernambuco, Recife, PE, Brazil.
authors.forename: Marcos E
authors.initials: ME
authors.lastname: Andrade
authors.affiliation: Departament of Nuclear Energy, Federal University of Pernambuco, Recife, PE, Brazil.
authors.forename: Max Well
authors.initials: MW
authors.lastname: Araujo
authors.affiliation: Departament of Nuclear Energy, Federal University of Pernambuco, Recife, PE, Brazil.
authors.forename: Izabela V
authors.initials: IV
authors.lastname: Brasileiro
authors.affiliation: Departament of Nuclear Energy, Federal University of Pernambuco, Recife, PE, Brazil.
authors.forename: Richard
authors.initials: R
authors.lastname: Kramer
authors.affiliation: California State University, Fresno, CA, USA.
authors.forename: Amir
authors.initials: A
authors.lastname: Huda
mesh_terms: D000388:Air; D000886:Anthropometry; D054893:Cone-Beam Computed Tomography / Q000379:methods / Q000592:standards*; D004867:Equipment Design; D005123:Eye / Q000528:radiation effects; D006257:Head / Q000528:radiation effects; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D008334:Mandible / Q000000981:diagnostic imaging*; D010306:Parotid Gland / Q000000981:diagnostic imaging; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011874:Radiometry / Q000592:standards*; D012867:Skin / Q000528:radiation effects; D013363:Submandibular Gland / Q000000981:diagnostic imaging; D013819:Thermoluminescent Dosimetry / Q000379:methods; D013961:Thyroid Gland / Q000000981:diagnostic imaging; D015898:Tomography Scanners, X-Ray Computed