Abstract
The variety of cone-beam computed tomography (CBCT) machines and their applications has rapidly increased in recent years, making the dose evaluation of individual devices an important issue. Patient doses from CBCT were assessed with two different methods: optically stimulated luminescence dosimeter (OSLD) measurements and Monte Carlo (MC) simulations, in four different examination modes. Based on an analysis of the measurement process and the obtained values, a recommendation is made regarding which method is more practical and efficient for acquiring the effective dose of CBCT. Twenty-two OSLDs were calibrated and equipped in human phantoms of head and neck organs. They were exposed to radiation from two CBCT units—CS9300 (Carestream Dental LLC, Atlanta, Georgia) and RAYSCAN α+ (Ray Co. Ltd, Hwaseong-si, Korea)—using two different examination modes. The dose recorded using the OSLDs was used to calculate the organ dose and the effective dose for each unit in each examination mode. These values were also calculated using MC software, PCXMC (STUK, Helsinki, Finland). The organ doses and effective doses obtained using both methods were compared for each examination mode of the individual units. The OSLD-measured effective dose value was higher than that obtained using the MC method for each examination mode, except the dual jaw mode of CS9300. The percent difference of the effective dose between the two methods ranged from 4.0% to 14.3%. The dose difference between the methods decreased as the field of view became smaller. The organ dose values varied according to the method, although the overall trend was similar for both methods. The organs showing high doses were mostly consistent for both methods. In this study, the effective dose obtained by OSLD measurements and MC simulations were compared, and both methods were described in detail. As a relatively efficient and easy-to-perform method, we cautiously suggest using MC simulations for dose evaluations in the future.
Highlights
The radiation doses of dental diagnostic examinations are relatively low compared to those of medical examinations [1, 2]
Dose assessment in dental cone-beam computed tomography (CBCT): Comparison of optically stimulated luminescence dosimetry (OSLD) with Monte Carlo (MC) method efficient and easy-to-perform method, we cautiously suggest using MC simulations for dose evaluations in the future
As cone-beam computed tomography (CBCT) has become widely performed for various purposes in dental clinics, it is no longer valid to state that the radiation dose in dentistry is very low
Summary
The radiation doses of dental diagnostic examinations are relatively low compared to those of medical examinations [1, 2]. As cone-beam computed tomography (CBCT) has become widely performed for various purposes in dental clinics, it is no longer valid to state that the radiation dose in dentistry is very low. Thermoluminescent dosimetry (TLD) is the traditional method of dose measurement, and most studies of dental radiation doses were based on this method [3]. MOSFET provides a fast reading of the dosage, as it connects directly to an electronic probe. It has generally been considered acceptable for dosimetry in radiotherapy, due to its suitability for high dose ranges [6]
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