TLD measurements and Monte Carlo calculations of head and neck organ and effective doses for cone beam computed tomography using 3D Accuitomo 170

Ernst, Marina; Manser, Peter; Dula, Karl; Volken, W.; Stampanoni, Marco; Fix, M.K.

doi:10.1259/dmfr.20170047

Cited by 20 publications

(19 citation statements)

References 16 publications

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“…few previous studies have used the ICRP reference phantoms, while others used computed tomographic scan data of the Rando-Alderson phantom [11,23,24]. In present study, the Cristy and Eckerman phantom contained in the software was used.…”

Section: Plos Onementioning

confidence: 99%

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Dose assessment in dental cone-beam computed tomography: Comparison of optically stimulated luminescence dosimetry with Monte Carlo method

et al. 2020

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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

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Section: Plos Onementioning

confidence: 99%

“…Both OSLD measurements and the MC simulation method are relatively new techniques in dental X-ray equipment at the present [10,11]. More research on these newly introduced methods (OSLD or MC calculations) compared to traditional dosimetry should be performed to prove the efficiency of these methods.…”

Section: Introductionmentioning

confidence: 99%

Dose assessment in dental cone-beam computed tomography: Comparison of optically stimulated luminescence dosimetry with Monte Carlo method

et al. 2020

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“…Limitations of this work may include the uncertainties from errors in the TLD readings 28 the sensitivity of the TLDs used in this study were 0.028. The experimental room did not fully account for a true interventional radiology environment, as the use of phantoms were employed for this study.…”

Section: Discussionmentioning

confidence: 99%

Radiation protection value to the operator from augmented reality smart glasses in interventional fluoroscopy procedures using phantoms

et al. 2019

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Introduction: Smart glasses can be adapted to display radiographic images to allow clinician's gaze not to be directionally fixed or predetermined by computer monitor location. This study presents an analysis of eye lens dose during interventional fluoroscopy guided procedures, comparing fixed monitor positions against the use of smart glasses.Methods: Using a head phantom (simulating the clinician), thermoluminescent dosimeters and lead shielded glasses, the dose to the eye was measured for different head 'rotations and tilts' for: gaze directed towards the main scattering source (patient / primary beam) to represent potential gaze direction if smart glasses are used; gaze directed to a range of potential computer monitor positions. An anthropomorphic pelvis phantom was utilised to simulate the patient. Accumulated dose rates (µGy.sˉ¹) from five 10-second exposures at 75 kV 25.2 mAs were recorded.Results: An average DAP reading of 758.84 cGy.cm 2 was measured during each 10 second exposure. Whilst wearing lead shielded glasses a 6.10fold reduction in dose rate to the lens is possible (p<0.05). Influence of the direction of gaze by the clinician demonstrated a wide range of dose rate reduction from 3.13% (p=0.16) to 143.69% (p<0.05) when the clinician's gaze was towards the main scattering source. Increased dose rate to the clinician's eyes was received despite wearing lead shielded glasses, as the angle of gaze moved 45º and 90º from 0º.Conclusion: If the clinician's gaze is directed towards the main scattering source a potential exists for reducing eye lens dose compared with fixed location computer monitors. Introduction of lead lined smart glasses into interventional radiology may lead to improvements in patient care, reducing the need for the clinician to look away from the patient to observe a radiographic image.

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“…In 2009, ICRP introduced reference phantom of female and male adult which is based on the actual computed tomographic data of adult human [22]. Among previous studies, only one adopted ICRP reference phantom and others used computed tomographic scan data of Rando-alderson phantom [11, 23]. In present study, the Cristy and Eckerman phantom facilitated in software was used without any modification.…”

Section: Discussionmentioning

confidence: 99%

“…Both OSLD measurement and MC simulation method are the short of data reported in dental x-ray equipment at present [10. 11]. More research on the newly introduced method, OSLD or MC calculation, compared to the traditional dosimetry should be performed to prove efficiency of these methods.…”

Section: Introductionmentioning

confidence: 99%

Dose assessment in dental cone beam computed tomography: comparison of optically stimulated luminescence dosimetry with the Monte Carlo method

Lee

Yoon

Han

et al. 2019

Preprint

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AbstractThe usage and the model variety of CBCT machine has been rapidly increasing, the dose evaluation of individual devices became an important issue. Patient dose from CBCT was assessed with two different methods, optically stimulated luminescence dosimeter (OSLD) measured and monte carlo (MC) simulation, in four different examination modes. Through the measurement process and obtained value, more practical and efficient method in acquiring CBCT effective dose would be suggested. Twenty-five OSLD were calibrated and equipped in human phantom of head and neck organs. This was exposed on 2 CBCT units, CS9300 (Carestream Dental LLC, Atlanta, Georgia) and RAYSCAN α+ (Ray Co. Ltd, Hwaseong-si, Korea) with 2 different examination modes. Dose recorded in dosimetry was obtained and organ dose as well as an effective dose were obtained in each units of examination modes. Those values were also calculated using MC software, PCXMC (STUK, Helsinki, Finland). The organ doses and effective doses from both methods were compared by each examination mode of individual unit. OSLD measured effective dose value was higher than that obtained with MC method in each examination mode, except dual jaw mode of CS9300. The percent difference of effective dose between the two methods were ranged from 4.0 to 14.3 %. The dose difference between the methods was decreased as the examination FOV decreased. Organ dose values were varied according to the method, while overall trend was similar in both methods. The organs showing high dose were mostly consistent in both methods. In this study, the effective dose obtained by OSLD measurement and MC simulation were compared and both methods were described in detail. Consequently, as relatively efficient and easy-handling method, we carefully suggest MC simulation for further dose evaluation.

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TLD measurements and Monte Carlo calculations of head and neck organ and effective doses for cone beam computed tomography using 3D Accuitomo 170

Cited by 20 publications

References 16 publications

Dose assessment in dental cone-beam computed tomography: Comparison of optically stimulated luminescence dosimetry with Monte Carlo method

Dose assessment in dental cone-beam computed tomography: Comparison of optically stimulated luminescence dosimetry with Monte Carlo method

Radiation protection value to the operator from augmented reality smart glasses in interventional fluoroscopy procedures using phantoms

Dose assessment in dental cone beam computed tomography: comparison of optically stimulated luminescence dosimetry with the Monte Carlo method

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