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Comparison of Cbct and Ct in Terms of Dose Value of Organs at Risk in Paranasal Sinus Imaging Publisher Pubmed



Pak F1 ; Hosseini Pooya SM2 ; Shabani H1 ; Baradaran S2 ; Salim Sadeq U1
Authors
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Authors Affiliations
  1. 1. Radiation Sciences Department, School of Allied Medical Sciences, Tehran University of Medical Sciences, Tehran, 14177-44361, Iran
  2. 2. Nuclear Science and Technology Research Institute, Tehran, 14395-836, Iran

Source: Radiation Protection Dosimetry Published:2022


Abstract

Irradiated dose to the organs at risk surrounding the paranasal sinuses was compared in cone beam computed tomography (CBCT) and multi spiral computed tomography with respect to the organs' relative positions to the imaging field. A head and neck Alderson-Rando phantom equipped with thermoluminescence dosemeters pellets was irradiated according to three routine CBCT protocols and one protocol in multi spiral computed tomography. Dose value of organs outside the imaging field as well as those measured dose of organs inside the field were assessed. The highest measured doses were obtained from CT scan for most of the organs investigated in this study, whereas the lowest one was associated with the low-resolution mode of CBCT. Also, statistical analysis showed no significant differences between the dose values of out-of-field organs in all CBCT modes, whereas significant differences were observed between the radiation doses of CT and CBCT modes for all organs at risk inside and outside of the imaging field. CBCT is recommended on the basis of having a lower dose; however, the image qualities were the same in the two employed modalities, so the approach of lower dose can be made. © 2022 The Author(s).
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