Study of effective dose of various protocols in equipment cone beam CT

Soares, Maria Rosangela; Batista, Wilson Otto; Antonio, Patrícia de Lara; Caldas, Linda V.E.; Maia, Ana F.

doi:10.1016/j.apradiso.2015.01.012

Cited by 14 publications

(6 citation statements)

References 15 publications

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“…There are several techniques to evaluate the effective dose quantity by using dosimeters inserted in anthropomorphic phantoms, such as thermoluminescent dosimeter (TLD) [ 11 , 12 ] and optically stimulated luminescent dosimeter [ 10 , 13 ] . Also, the use of radiochromic film [ 14 ] and metal-oxide semiconductor field-effect transistor dosimeter [ 15 ] offers a very fast readout possibility compared with very time-consuming dosimeter; however, these methods require several steps for data acquisition and also have significant associated uncertainties [ 16 , 17 ] .…”

Section: Introductionmentioning

confidence: 99%

Estimated radiation risk of cancer from dental cone-beam computed tomography imaging in orthodontics patients

Yeh¹,

Chen

2018

BMC Oral Health

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BackgroundRadiation dose evaluation is important to cone-beam computed tomography (CBCT) for routine orthodontic treatment planning, especially for a significant proportion of children in orthodontic patients. This study evaluated the patient radiation dose and estimated the radiation cancer risk on dental CBCT according to the calculations by the Monte Carlo simulation method.MethodsThe dental CBCT scanner evaluated in this project was the i- CAT® (Imaging Sciences International Inc., PA, U.S.A.) device. Organ doses and effective doses were calculated by using personal computer-based Monte Carlo simulation (PCXMC 2.0 Rotation) software. The cancer risk resulting from the exposure to ionizing radiation was estimated by using the BEIR VII (Biologic Effects of Ionizing Radiation VII) report model, and the risk of exposure-induced death (REID) was assessed by PCXMC 2.0 Rotation software.ResultsThe largest contribution to the organ dose and effective dose at Zref 83 cm positioned in the dental CBCT x-ray beam centerline was from the salivary glands (738.29μGy, 7.38 μSv). The different organ doses showed the maximum values at the different Zref locations, and the largest contribution to the organ dose and effective dose of all simulated positions was from the thyroid (928.77μGy, 37.5 μSv). The REID values in the 10-year olds (22.6 × 10− 7, female; 19 × 10− 7, male) were approximately double than those in 30-year olds (10.4 × 10− 7, female; 8.88 × 10− 7, male) for all cancers. The highest change during age range from 10 to 30 was shown in breast cancer of females.ConclusionsAlthough individual cancer risk estimates as a function of gender and age are small, the concern about the risks from dental CBCT is related to the rapid increase in its use for orthodontic practice, especially in children patients.

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Section: Introductionmentioning

confidence: 99%

Estimated radiation risk of cancer from dental cone-beam computed tomography imaging in orthodontics patients

Yeh¹,

Chen

2018

BMC Oral Health

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“…The effective dose values presented below in table 3 were compared with the studies conducted with TLD for the same protocols [6,7]. The maximum and minimum differences found were: (20% to 6%); (37% to 20%) and (21% to 3%) for protocols P2; P3 and P6 respectively.…”

Section: Resultsmentioning

confidence: 99%

“…A specific objective was to demonstrate the usefulness of this implementation for educational purposes. The results will be compared with values obtained using dosimeters (TLD) inserted in an anthropomorphic phantom in previously published studies [6,7].…”

Section: Introductionmentioning

confidence: 99%

Organ dose estimates for six dental cone beam CT scan protocols using Monte Carlo simulations

Batista¹

2019

Biomed. Phys. Eng. Express

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This study aimed to develop geometry of irradiation applicable to the software PCXMC for organs dose estimate and the consequent calculation of effective dose in applications of Cone Beam Computed Tomography (CBCT). Three different CBCT scanners for dental applications were evaluated: CareStream CS 9000 3D; i-CAT, and Gendex GXCB-500. Initially, each image protocol was characterized dosimetrically, measuring the incident air kerma, K i and the product of air kerma-area product, P KA . A Radcal solid state detector and a PTW transmission chamber were used for this purpose. Then the technical parameters, dosimetric parameters, and geometric conditions of each preset protocol were input in the PCXMC™ software to calculate the values of effective dose. The dose values in organs and tissues vary according to the protocol used and the centering of the x-ray beam. The calculated effective dose was within the range of (15.7 to 18.7 μSv)/(41.9 to 55.7 μSv) for CS 9000 3D, (70.6 to 72.6 μSv)/(76.6 to 83.2 μSv) for the GXCB-500, and (85.9 to 120 μSv)/(114.0 to 141.1 μSv) for the Classical i-CAT. These values were compared with results obtained from dosimetric data using a thermoluminescent dosimeter, TLD, implanted in an anthropomorphic phantom. The comparison between the values obtained by PCXMC and TLD data was considered consistent. The effective dose results were very sensitive to the geometry of radiation (beam position in the mathematical stylized phantom). This factor indicated the limitations of the software used. However, the software used is very useful as a tool in the optimization process for image protocols and the awareness of professionals. It can be concluded that the use of the PCXMC Monte Carlo simulation software was useful for the assessment protocols for CBCT dental applications.

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“…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]. Many researchers estimate effective doses in dental CBCT scanners using MC simulation [1,9,13,[15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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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Study of effective dose of various protocols in equipment cone beam CT

Cited by 14 publications

References 15 publications

Estimated radiation risk of cancer from dental cone-beam computed tomography imaging in orthodontics patients

Estimated radiation risk of cancer from dental cone-beam computed tomography imaging in orthodontics patients

Organ dose estimates for six dental cone beam CT scan protocols using Monte Carlo simulations

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

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