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

Lee, Chena; Yoon, Jeongmin; Han, Sang-Sun; Na, Ji Yeon; Lee, Jeong-Hee; Kim, Young Hyun; Hwang, Jae Joon

doi:10.1371/journal.pone.0219103

Cited by 9 publications

(6 citation statements)

References 24 publications

(38 reference statements)

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“…In literature, only few studies have examined side differences in dentomaxillofacial imaging, especially for the parotid and lens region, describing that the size and position of the FOV and the rotation arc may lead to dose asymmetry [ 7 ]. There are studies in which dose measurements were performed on both sides of paired organs, but side differences have not been discussed [ 14 ]. Especially in dentistry, where CBCT is a rising frequently used imaging method, our results according side differences may improve the diagnostic work-up in clinical and practice settings in order to lower the radiation exposure [ 15 ].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of skin doses for cone-beam computed tomography in dentomaxillofacial imaging: A preclinical study

et al. 2021

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Purpose Evaluation of skin organ doses in six different cone-beam computed tomography scanners (CBCT) dedicated to dentomaxillofacial imaging. Our hypothesis is that the dose varies between different devices, protocols and skin areas. Materials and methods An anthropomorphic adult head and neck phantom was used to which a dosimeter (Waterproof Farmer® Chamber, PTW, Freiburg, Germany) was attached to anatomic landmarks of both parotid glands, both ocular lenses, the thyroid gland and the neurocranium. CBCT examinations were performed on six different CBCT devices dedicated to dentomaxillofacial imaging with standard settings and, if available, also in high dose settings. Measurements were repeated five times each. Results The measured mean skin doses ranged from 0.48 to 2.21 mGy. The comparison of the region based dose evaluation showed a high correlation between the single measurements. Furthermore, the distribution of doses between regions was similar in all devices, except that four devices showed side differences for the dose of the parotid region and one device showed side differences for the lens region. The directly exposed regions, such as the parotid glands, showed significant higher values than the more distant regions like the neurocranium. When comparing examination protocols, a significant difference between the standard dose and the high dose acquisitions could be detected. But also a significant dose difference between the different CBCTs could be shown. 3D Accuitomo 170 (Morita, Osaka, Japan) showed the highest absorbed mean dose value for standard settings with 2.21 mGy, especially at the directly exposed regions and their adjacent organs. The lowest mean value for standard settings was achieved with VGi evo (NewTom, Verona, Italy) with 0.48 mGy. Conclusion Repeated measurements of skin organ doses in six different CBCT scanners using a surface dosimeter showed side differences in distribution of dose in five devices for the parotid and lens region. Additionally, significant dose differences between the devices could be detected. Further studies should be performed to confirm these results.

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Section: Discussionmentioning

confidence: 99%

Evaluation of skin doses for cone-beam computed tomography in dentomaxillofacial imaging: A preclinical study

et al. 2021

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“…Thus, the effective doses of scanned organs could be calculated precisely. The considerable advantages such as reducing the uncertainties caused by type, location, and the limited number of the dosimeters, make the MC simulation to be a very useful tool in radiation dose calculation [13,15,16].…”

Section: Jinst 16 P10011mentioning

confidence: 99%

“…Generally, the effective dose measurement which is calculated using absorbed dose can be performed using thermoluminescent dosimeters (TLDs) or optically stimulated luminescent (OSL) dosimeters in physical anthropomorphic phantoms [8][9][10][11][12][13][14]. Nowadays, The SEDENTEXCT guidelines strongly recommend the use of the Monte Carlo (MC) simulation in virtual phantoms for the evaluation of the effective doses in CBCT examinations [6].…”

Section: Introductionmentioning

confidence: 99%

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Patient-specific dose assessment using CBCT images and Monte Carlo calculations

et al. 2021

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Today, the use of Cone-Beam Computed Tomography (CBCT) is increasing rapidly in medical diagnosis, therefore evaluation of patient's dose is a very important issue in radiation protection of patients. This study aimed to evaluate the patient-specific dose using CBCT images. Since CBCT images only showed a part of the head and while, the total anatomical specification of the head should be defined for dose assessment, therefore the whole parts of the head were generated using the data of the Extended Cardiac-Torso (XCAT) reference phantoms and pseudo-images were created. Tissue densities were calculated by the voxel values of pseudo-images and were used as the input file of Gate8.2 Monte Carlo (MC) code. Also, the GIANO CBCT unit was simulated and the absorbed dose was calculated by the code. For verification of this method, Rando phantom with embedded thermoluminescence dosimeters (TLD) with different protocols was used. The results of MC calculations and TLD measurements were compared and statistical analysis was performed using IBM SPSS Statistics. The calculated effective dose values determined by CBCT images for three different Temporomandibular joint, Single-Arch, and Both-Arch protocols were found to be 87 ± 3 μSv, 64 ± 1 μSv, and 66 ± 2 μSv, and the results of thermoluminescence dosimetry were 86 ± 2 μSv, 57 ± 1 μSv, and 63 ± 3 μSv, respectively. There were no significant differences (P-Value>0.05) between the results of MC calculations using CBCT images and the results of TLD dosimeters. In this study, a method for patient-specific dose assessment using CBCT images was introduced. It was shown that the dose of patients with its specification can be evaluated by CBCT images with acceptable accuracy.

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“…Cone-beam computed tomography (CBCT) is widely used in the dental field for purposes ranging from disease diagnosis to preoperative simulation and surgical guide construction [ 1 , 2 ]. CBCT can provide three-dimensional (3D) images of the targeted area with the advantage of lower dosage than multidetector computed tomography (MDCT) [ 3 , 4 ]. However, in CBCT, due to the cone-shaped geometry of the X-ray source and the absence of post-patient collimation, more scattering rays deteriorate the image quality than is the case with MDCT.…”

Section: Introductionmentioning

confidence: 99%

Multi-planar 2.5D U-Net for image quality enhancement of dental cone-beam CT

et al. 2023

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Cone-beam computed tomography (CBCT) can provide 3D images of a targeted area with the advantage of lower dosage than multidetector computed tomography (MDCT; also simply referred to as CT). However, in CBCT, due to the cone-shaped geometry of the X-ray source and the absence of post-patient collimation, the presence of more scattering rays deteriorates the image quality compared with MDCT. CBCT is commonly used in dental clinics, and image artifacts negatively affect the radiology workflow and diagnosis. Studies have attempted to eliminate image artifacts and improve image quality; however, a vast majority of that work sacrificed structural details of the image. The current study presents a novel approach to reduce image artifacts while preserving details and sharpness in the original CBCT image for precise diagnostic purposes. We used MDCT images as reference high-quality images. Pairs of CBCT and MDCT scans were collected retrospectively at a university hospital, followed by co-registration between the CBCT and MDCT images. A contextual loss-optimized multi-planar 2.5D U-Net was proposed. Images corrected using this model were evaluated quantitatively and qualitatively by dental clinicians. The quantitative metrics showed superior quality in output images compared to the original CBCT. In the qualitative evaluation, the generated images presented significantly higher scores for artifacts, noise, resolution, and overall image quality. This proposed novel approach for noise and artifact reduction with sharpness preservation in CBCT suggests the potential of this method for diagnostic imaging.

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

Cited by 9 publications

References 24 publications

Evaluation of skin doses for cone-beam computed tomography in dentomaxillofacial imaging: A preclinical study

Evaluation of skin doses for cone-beam computed tomography in dentomaxillofacial imaging: A preclinical study

Patient-specific dose assessment using CBCT images and Monte Carlo calculations

Multi-planar 2.5D U-Net for image quality enhancement of dental cone-beam CT

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