Skin Doses on the Lens for Temporomandibular Joint Exam in Cone Beam Computed Tomography

Brazilian Archives of Biology and Technology

Marcus Vinicius Linhares De Oliveira¹  Marcos Ely Almeida Andrade¹  Wilson Otto Batista¹  Paulo Sergio Flores Campos¹ 

关键词: cone beam computed tomography;    temporomandibular joint;    radiation dosimetry;   

DOI  :  10.1590/S1516-89132015060233

来源: SciELO

【 摘 要 】

ABSTRACT The aim of this study was to evaluate the kerma at the surface of the lens in TMJ CBCT and to derive the equivalent dose. An anthropomorphic phantom of the head and neck manufactured by Radiation Support Devices (model RS-230) was used. The dosimetric measurements were obtained by using fourteen thermoluminescent dosimetry (TLD) dosimeters (LiF: Mg, Ti), divided in two pairs (one pair for each eye) and positioned on the surface of the phantom, per scanner evaluated. The tomographic images were acquired in three types of CBCT equipment (CS 9000, Gendex GXCB 500 and i-CAT). Values of equivalent dose obtained were: 5.82 mSv (CS 9000); 5.38 mSv (Gendex GXCB 500) and 7.98 mSv (i-CAT), which varied in accordance with the scanner and the exposure factors used in the image acquisition. The Gendex GXCB 500 used larger FOV and higher kV, resulting in levels close to those obtained on the CS 9000, while larger doses were associated with the i-CAT. The dose values associated with TMJ radiological procedures should be performed with awareness and appropriateness due to sensitivity of the lens.

【 授权许可】

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