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Ito M, Chida K, Onodera S, Kojima I, Iikubo M, Kato T, Fujisawa M, Zuguchi M. Evaluation of radiation dose and image quality for dental cone-beam computed tomography in pediatric patients. JOURNAL OF RADIOLOGICAL PROTECTION : OFFICIAL JOURNAL OF THE SOCIETY FOR RADIOLOGICAL PROTECTION 2023; 43:031518. [PMID: 37696261 DOI: 10.1088/1361-6498/acf868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 09/11/2023] [Indexed: 09/13/2023]
Abstract
Children are sensitive to radiation; therefore, it is necessary to reduce radiation dose as much as possible in pediatric patients. In addition, it is crucial to investigate the optimal imaging conditions as they considerably affect the radiation dose. In this study, we investigated the effect of different imaging conditions on image quality and optimized the imaging conditions for dental cone-beam computed tomography (CBCT) examinations to diagnose ectopic eruptions and impacted teeth in children. To achieve our aims, we evaluated radiation doses and subjective and objective image quality. The CBCT scans were performed using 3D Accuitomo F17. All combinations of a tube voltage (90 kV), tube currents (1, 2, 3 mA), fields of view (FOVs) (4 × 4, 6 × 6 cm), and rotation angles (360°, 180°) were used. Dose-area product values were measured. SedentexCT IQ cylindrical phantom was used to physically evaluate the image quality. We used the modulation transfer function as an index of resolution, the noise power spectrum as an index of noise characteristics, and the system performance function as an overall evaluation index of the image. Five dentists visually evaluated the images from the head-neck phantom. The results showed that the image quality tended to worsen, and scores for visual evaluation decreased as tube currents, FOVs and rotation angles decreased. In particular, image noise negatively affected the delineation of the periodontal ligament space. The optimal imaging conditions were 90 kV, 2 mA, 4 × 4 cm FOV and 180° rotation. These results suggest that CBCT radiation doses can be significantly reduced by optimizing the imaging conditions.
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Affiliation(s)
- Misaki Ito
- Department of Radiology, Tohoku University Hospital, 1-1 Seiryo-machi, Aoba-ku, Sendai 980-8574, Japan
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
| | - Koichi Chida
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
- Division of Disaster Medical Science, International Research Institute of Disaster Science, Tohoku University, 468-1 Aoba, Aramaki, Aoba-ku, Sendai 980-8572, Japan
| | - Shu Onodera
- Department of Radiology, Tohoku University Hospital, 1-1 Seiryo-machi, Aoba-ku, Sendai 980-8574, Japan
| | - Ikuho Kojima
- Division of Oral and Maxillofacial Radiology, Tohoku University Hospital, 1-1 Seiryo-machi, Aoba-ku, Sendai 980-8574, Japan
- Division of Dental Informatics and Radiology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
| | - Masahiro Iikubo
- Division of Oral and Maxillofacial Radiology, Tohoku University Hospital, 1-1 Seiryo-machi, Aoba-ku, Sendai 980-8574, Japan
- Division of Dental Informatics and Radiology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
| | - Toshiki Kato
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
| | - Masaki Fujisawa
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
| | - Masayuki Zuguchi
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
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Nomura Y, Watanabe H, Tomisato H, Kawashima S, Miura M. Gumbel distribution-based technique enables quantitative comparison between streak metal artifacts of multidetector row CT and cone-beam CT: a phantom study. Phys Eng Sci Med 2023; 46:801-812. [PMID: 37052806 DOI: 10.1007/s13246-023-01252-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 03/27/2023] [Indexed: 04/14/2023]
Abstract
Cone-beam computed tomography (CBCT), derived from multidetector row CT (MDCT), has a high spatial resolution and has recently been applied to various organs. One of the severe limitations common to CBCT and MDCT is metal artifacts. In particular, streak metal artifacts (SMAs) between multiple metal materials often hinder diagnosis. However, no studies have quantitatively compared the strength of SMAs in MDCT and CBCT. Nomura et al. reported an evaluation method specialized in SMAs of CBCT using the Gumbel distribution (GD), which can also be applied to SMAs of MDCT (Oral Surg Oral Med Oral Pathol Oral Radiol 131: 494-502, 2021, https://doi.org/10.1016/J.OOOO.2020.08.031 ). This study aimed to quantitatively compare SMAs occurring between titanium materials on MDCT and CBCT images using the GD-based method. The SMAs were investigated as follows: A hydroxyapatite block was sandwiched between two titanium rods to generate an SMA. They were placed in an acrylic phantom, simulating a human head, and scanned using an MDCT scanner and two CBCT scanners. The obtained images were analyzed using Gumbel plots and location parameters, and the SMA strength was calculated. The results showed that the SMAs on the MDCT images were significantly weaker than those on the CBCT images. In the CBCT scans, a smaller volume CT dose index value caused stronger SMAs. These results indicate that MDCT is more advantageous than CBCT in terms of SMA reduction when bone morphology between titanium materials must be evaluated. The characteristic should be considered in clinical cases.
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Affiliation(s)
- Yoshikazu Nomura
- Department of Dental Radiology and Radiation Oncology, Graduate School, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8549, Japan.
| | - Hiroshi Watanabe
- Department of Dental Radiology and Radiation Oncology, Graduate School, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8549, Japan
| | - Hiroshi Tomisato
- Radiology Center, Division of Integrated Facilities, Tokyo Medical and Dental University Hospital, Tokyo, Japan
| | - Sakurako Kawashima
- Department of Dental Radiology and Radiation Oncology, Graduate School, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8549, Japan
| | - Masahiko Miura
- Department of Dental Radiology and Radiation Oncology, Graduate School, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8549, Japan
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Montanha-Andrade K, Crusoé-Rebello IM, Barreto M, Neves FS, Santos JND, Cury PR. Assessment of the relationship between tooth inclination and gingival and alveolar bone dimensions using computed tomography of the maxillary anterior teeth: a cross-sectional study. Dental Press J Orthod 2022; 27:e222136. [PMID: 36169497 PMCID: PMC9507018 DOI: 10.1590/2177-6709.27.4.e222136.oar] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Accepted: 07/14/2021] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVE The present study aimed to investigate the relationship between tooth inclination and gingival and bone dimensions in maxillary anterior teeth. METHODS This cross-sectional study included cone-beam computed tomography (CBCT) images of 160 maxillary anterior teeth (30 individuals). Tooth inclination, gingival and bone thickness, and distances from cementoenamel junction to alveolar bone crest and gingival margin were measured in the labial surface. The correlations were analyzed using Pearson and partial correlation tests (p≤0.05). RESULTS In the central incisors, tooth inclination was positively and significantly related to apical bone thickness (R = 0.34, p= 0.001). In the canines, tooth inclination was negatively and significantly related to cervical bone thickness (R = - 0.34, p= 0.01) and positively associated to apical bone thickness (R = 0.36, p= 0.01) and to gingival margin-cementoenamel junction distance (R = 0.31, p= 0.03). In the lateral incisors, tooth inclination was not associated with gingival or bone dimensions. CONCLUSIONS In the central incisors, the greater the labial tooth inclination, the greater is the apical bone thickness. In the canines, the greater the labial tooth inclination, the smallest is the cervical bone thickness, the greater is the apical bone thickness, and the greater is the gingival margin. Gingival and bone dimensions should be assessed when planning orthodontic treatment involving buccal movement of central incisors and canines.
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Affiliation(s)
| | - Ieda Margarida Crusoé-Rebello
- Universidade Federal da Bahia, Faculdade de Odontologia, Departamento de Radiologia Dentomaxilofacial (Salvador/BA, Brazil)
| | - Mauricio Barreto
- Escola Bahiana de Medicina e Saúde Pública, Departamento de Implantologia (Salvador/BA, Brazil)
| | - Frederico Sampaio Neves
- Universidade Federal da Bahia, Faculdade de Odontologia, Departamento de Radiologia Dentomaxilofacial (Salvador/BA, Brazil)
| | - Jean Nunes Dos Santos
- Universidade Federal da Bahia, Faculdade de Odontologia, Departamento de Patologia Oral (Salvador/BA, Brazil)
| | - Patricia Ramos Cury
- Universidade Federal da Bahia, Faculdade de Odontologia, Departamento de Periodontia (Salvador/BA, Brazil)
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Pak F, Hosseini Pooya SM, Shabani H, Baradaran S, Salim Sadeq U. COMPARISON OF CBCT AND CT IN TERMS OF DOSE VALUE OF ORGANS AT RISK IN PARANASAL SINUS IMAGING. RADIATION PROTECTION DOSIMETRY 2022; 198:208-213. [PMID: 35253875 DOI: 10.1093/rpd/ncac013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2021] [Revised: 11/16/2021] [Accepted: 11/19/2021] [Indexed: 06/14/2023]
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.
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Affiliation(s)
- Farideh Pak
- Radiation Sciences Department, School of Allied Medical Sciences, Tehran University of Medical Sciences, 14177-44361 Tehran, Iran
| | | | - Hamed Shabani
- Radiation Sciences Department, School of Allied Medical Sciences, Tehran University of Medical Sciences, 14177-44361 Tehran, Iran
| | - Samaneh Baradaran
- Nuclear Science & Technology Research Institute, 14395-836 Tehran, Iran
| | - Ula Salim Sadeq
- Radiation Sciences Department, School of Allied Medical Sciences, Tehran University of Medical Sciences, 14177-44361 Tehran, Iran
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Li Y, Huang B, Cao J, Fang T, Liu G, Li X, Wu J. ESTIMATING RADIATION DOSE TO MAJOR ORGANS IN DENTAL X-RAY EXAMINATIONS: A PHANTOM STUDY. RADIATION PROTECTION DOSIMETRY 2020; 192:328-334. [PMID: 33320946 DOI: 10.1093/rpd/ncaa196] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 09/30/2020] [Accepted: 11/05/2020] [Indexed: 06/12/2023]
Abstract
The radiation doses absorbed by major organs of males and females were studied from three types of dental X-ray devices. The absorbed doses from cone-beam computed tomography (CBCT), panoramic and intraoral X-ray machines were in the range of 0.23-1314.85 μGy, and were observed to be high in organs and tissues located in or adjacent to the irradiated area, there were discrepancies in organ doses between male and female. Thyroid, salivary gland, eye lens and brain were the organs that received higher absorbed doses. The organ absorbed doses were considerably lower than the diagnostic reference level for dental radiography in China. The calculated effective radiation doses for males and females were 56.63, 8.15, 2.56 μSv and 55.18, 8.99, 2.39 μSv, respectively, when using CBCT, the panoramic X-ray machine and intraoral X-ray machine. The effective radiation dose caused by CBCT was much higher than those of panoramic and intraoral X-ray machines.
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Affiliation(s)
- Yong Li
- Department of Nuclear Science and Technology, School of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Bingsheng Huang
- Medical AI Lab, School of Biomedical Engineering, Health Science Center, Shenzhen University, Shenzhen 518071, China
| | - Jun Cao
- Department of Stomatology, Shenzhen University General Hospital, Shenzhen 518055, China
| | - Tianqi Fang
- Medical AI Lab, School of Biomedical Engineering, Health Science Center, Shenzhen University, Shenzhen 518071, China
- Shenzhen University General Hospital Clinical Research Center for Neurological Diseases, Shenzhen 518071, China
| | - Guoqing Liu
- Department of Nuclear Science and Technology, School of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Xuguang Li
- Department of Stomatology, Shenzhen University General Hospital, Shenzhen 518055, China
| | - Jiabao Wu
- Department of Nuclear Science and Technology, School of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
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Scatter-to-primary ratio in cone beam computed tomography with extended source to image-receptor distance for image-guided proton beam therapy system. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2019.108667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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2D vs. 3D Radiological Methods for Dental Age Determination around 18 Years: A Systematic Review. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10093094] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The age of a living human being can be determined by applying a number of different methods; the most diffused are skeletal and dental methods, both principally based on X-rays examinations. This systematic review assesses the current evidence regarding the accuracy and reliability of Cone Beam Computed Tomography (CBCT) vs. Orthopantomography (OPG) in age determination. A computerized systematic literature search of studies published up to January 2020 was conducted without language restrictions in order to identify articles comparing CBCT vs. OPG in dental anatomy evaluation, articles evaluating the accuracy of dental methods for age estimation, both with CT and OPG exams, and articles comparing CBCT vs. OPG in terms of radiation dose. CBCT was found to be more accurate compared to OPG in dental anatomy evaluation. When analyzing young adults, an estimation error of two years is considered forensically acceptable. The radiation dose of a CBCT exam is higher compared to an OPG exam. However, the difference is not as marked with small Fields Of View (FOV) and low-resolution protocols. Final conclusion was that a small FOV CBCT centered on the mandibular angle of a young patient is an accurate and safe method for dental age estimation around the age of 18.
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Jiang Y, Yang C, Yang P, Hu X, Luo C, Xue Y, Xu L, Hu X, Zhang L, Wang J, Sheng K, Niu T. Scatter correction of cone-beam CT using a deep residual convolution neural network (DRCNN). ACTA ACUST UNITED AC 2019; 64:145003. [DOI: 10.1088/1361-6560/ab23a6] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Benouaich V, Hitzel A, Armand S. Relevance of functional imaging in dental implantology. J Clin Exp Dent 2018; 10:e1011-e1016. [PMID: 30386508 PMCID: PMC6203899 DOI: 10.4317/jced.54816] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 04/26/2018] [Indexed: 01/16/2023] Open
Abstract
Background Despite it is widely used in many medicine fields, the use of functional imaging to examine dental implants has not been reported in the literature. This work aimed to evaluate the relevance of functional medical imaging in oral implantology. Material and Methods This single-center observational study was conducted for 6 months at the Toulouse University Hospital, France. All patients who underwent positron emission tomography with 18-fluorodeoxyglucose integrated with X-ray computed tomography (FDG PET/CT) and had dental implants were included. Metabolic activity of the peri-implant tissues was assessed qualitatively and quantitatively jointly by a nuclear physician and a dental surgeon. Results In 31 patients (121 implants), peri-implant metabolic activity was normal. In 3 patients (4 implants), localized peri-implant hypermetabolism was observed. In all the patients presenting abnormal peri-implant activity, the implants with normal activity were clinicaly and radiogicaly normal, whereas those with hypermetabolism presented peri-implantitis. Conclusions This study assess of the relevance of FDG PET/CT in oral implantology. It shows a link between peri-implant hypermetabolism and peri-implantitis. Therefore, FDG PET/CT could become a new tool for the assessment of peri-implant diseases. Key words:Dental implantation, dental implants, peri-implantitis, diagnostic imaging , imaging, three-dimensional, imaging processing, computer-assisted.
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Affiliation(s)
- Vincent Benouaich
- Doctor of Dental Surgery, Department of Odontology, Toulouse University Hospital, France
| | - Anne Hitzel
- Doctor of Medicine, Department of Nuclear Medicine, Toulouse University Hospital, France
| | - Serge Armand
- Doctor of Dental Surgery, University Professor, Department of Odontology, Toulouse University Hospital, France
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Li CL, Thakur Y, Ford NL. Comparison of the CTDI and AAPM report No. 111 methodology in adult, adolescent, and child head phantoms for MSCT and dental CBCT scanners. J Med Imaging (Bellingham) 2017; 4:031212. [PMID: 28983492 PMCID: PMC5621782 DOI: 10.1117/1.jmi.4.3.031212] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 09/18/2017] [Indexed: 11/30/2022] Open
Abstract
This study investigates the dosimetry methodology proposed by the American Association of Physicists in Medicine (AAPM) task group 111 and compares with the computed tomography dose index (CTDI) method and the SEDENTEXCT DI method on one clinical multislice CT and two dental cone beam CT (CBCT) scanners using adult, adolescent, and child head phantoms. Following the AAPM method, the normalized (100 mAs) equilibrium doses ([Formula: see text]) for Toshiba Aquilion One MSCT computed using dose measurements from the central hole of the phantom ([Formula: see text]), the peripheral hole of the phantom, ([Formula: see text]), and by the [Formula: see text] equation ([Formula: see text]) are in the range from 20 to 25 mGy. For i-CAT Next Generation dental CBCT, the normalized [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] by the two SEDENTEXCT DI methods are in the range from 12 to 15 mGy. Fitting the AAPM equation is not possible for the limited scan lengths available on the CS 9300 dental CBCT. This study offers a simple CTDI-like measurement that can approximate the AAPM [Formula: see text] in clinical CBCT scanners capable of providing four or more scan lengths.
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Affiliation(s)
- Celina L. Li
- University of British Columbia, Faculty of Science, Department of Physics and Astronomy, Vancouver, British Columbia, Canada
| | - Yogesh Thakur
- University of British Columbia, Faculty of Science, Department of Physics and Astronomy, Vancouver, British Columbia, Canada
- Lower Mainland Medical Imaging Services, Vancouver Coastal Health Authority, Vancouver, British Columbia, Canada
- University of British Columbia, Faculty of Medicine, Department of Radiology, Vancouver, British Columbia, Canada
| | - Nancy L. Ford
- University of British Columbia, Faculty of Science, Department of Physics and Astronomy, Vancouver, British Columbia, Canada
- University of British Columbia, Faculty of Dentistry, Department of Oral Biological and Medical Sciences, Vancouver, British Columbia, Canada
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Dau M, Marciak P, Al-Nawas B, Staedt H, Alshiri A, Frerich B, Kämmerer PW. Evaluation of symptomatic maxillary sinus pathologies using panoramic radiography and cone beam computed tomography-influence of professional training. Int J Implant Dent 2017; 3:13. [PMID: 28382560 PMCID: PMC5382121 DOI: 10.1186/s40729-017-0075-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Accepted: 03/12/2017] [Indexed: 11/23/2022] Open
Abstract
Background A comparison of panoramic radiography (PAN) alone and PAN together with small field of view cone beam computed tomography (sFOV-CBCT) for diagnosis of symptomatic pathologies of the maxillary sinus was carried out by clinicians of different experience. Methods Corresponding radiographic images (PAN/sFOV-CBCT) of 28 patients with symptomatic maxillary sinus pathologies were chosen and analyzed by two general practitioners (GP), two junior maxillofacial surgeons (MS1), and three senior maxillofacial surgeons (MS2) via questionnaire. Results Visibility of maxillary pathologies in PAN was significantly different between the groups (GP 39%, MS1 48%, MS2 61%; p < 0.05). The number of incidental findings varied within examiner groups in PAN with a significant increase in MS2 (p = 0.027). The majority of examiners rated an additional sFOV-CBCT as “reasonable”/“required” with a significant influence of the examining groups (GP 98.2%, MS1 94.6%, MS2 80.9%; p = 0.008). In 58% of cases, an additional sFOV-CBCT was seen as “affecting therapy” with significant differences between the groups (GP 68%, MS1 50%, MS2 55%; p < 0.001). Conclusions PAN alone is not sufficient for the evaluation of pathologies of the maxillary sinus. But, depending on the examiners’ clinical experience, it remains a useful diagnostic tool. Along with the observers’ training, significant benefits of an additional sFOV-CBCT for evaluation of symptomatic maxillary sinus pathologies were detected.
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Affiliation(s)
- Michael Dau
- Department of Oral, Maxillofacial and Plastic Surgery, University Medical Center, Schillingallee 35, 18057, Rostock, Germany.
| | - Paul Marciak
- Department of Oral and Maxillofacial Surgery, Plastic Surgery, University Medical Centre, Mainz, Germany
| | - Bial Al-Nawas
- Department of Oral and Maxillofacial Surgery, Plastic Surgery, University Medical Centre, Mainz, Germany
| | | | - Abdulmonem Alshiri
- Department of Biomaterial and Prosthetic Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Bernhard Frerich
- Department of Oral, Maxillofacial and Plastic Surgery, University Medical Center, Schillingallee 35, 18057, Rostock, Germany
| | - Peer Wolfgang Kämmerer
- Department of Oral, Maxillofacial and Plastic Surgery, University Medical Center, Schillingallee 35, 18057, Rostock, Germany
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Wahid MA, Choi E, MacDonald DS, Ford NL. Dosimetry analysis of panoramic-imaging devices in different-sized phantoms. J Appl Clin Med Phys 2017; 18:197-205. [PMID: 28300383 PMCID: PMC5689944 DOI: 10.1002/acm2.12059] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Revised: 01/17/2017] [Accepted: 01/19/2017] [Indexed: 11/12/2022] Open
Abstract
The aim of this study is to measure the radiographic dose in adult, adolescent, and child head-sized PMMA phantoms for three panoramic-imaging devices: the panoramic mode on two CBCT machines (Carestream 9300 and i-CAT NG) and the Planmeca ProMax 2D. A SEDENTEXCT dose index adult phantom and custom-built adolescent and pediatric PMMA dosimetry phantoms were used. Panoramic radiographs were performed using a Planmeca ProMax 2D and the panoramic mode on a Carestream 9300 CBCT and an i-CAT NG using the protocols used clinically. Point dose measurements were performed at the center, around the periphery and on the surface of each phantom using a thimble ionization chamber. Five repeat measurements were taken at each location. For each machine, single-factor ANOVA was conducted to determine dose differences between protocols in each phantom, as well as determine the differences in absorbed dose when the same protocol was used for different-sized phantoms. For any individual phantom, using protocols with lower kVp, mA, or acquisition times resulted in statistically significant dose savings, as expected. When the same protocol was used for different-sized phantoms, the smaller phantom had a higher radiation dose due to less attenuation of x-rays by the smaller phantom and differences in the positioning of the ion chamber relative to the focal trough. The panoramic-mode on the CBCT machines produce images suitable for clinical use with similar dose levels to the stand-alone panoramic device. Significant dose savings may result by selecting age- and size- appropriate protocols for pediatric patients, but a wider range of protocols for children and adolescents may be beneficial.
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Affiliation(s)
- Muizz A. Wahid
- Oral Biological and Medical SciencesThe University of British ColumbiaVancouverBCCanada
| | - Ella Choi
- Oral Biological and Medical SciencesThe University of British ColumbiaVancouverBCCanada
| | - David S. MacDonald
- Oral Biological and Medical SciencesThe University of British ColumbiaVancouverBCCanada
| | - Nancy L. Ford
- Oral Biological and Medical SciencesThe University of British ColumbiaVancouverBCCanada
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Dau M, Edalatpour A, Schulze R, Al-Nawas B, Alshihri A, Kämmerer PW. Presurgical evaluation of bony implant sites using panoramic radiography and cone beam computed tomography-influence of medical education. Dentomaxillofac Radiol 2016; 46:20160081. [PMID: 27759998 DOI: 10.1259/dmfr.20160081] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
OBJECTIVES The aim of this study was to compare the subjective quality rating of panoramic radiography (PAN) and CBCT in the planning of dental implant procedures by clinicians with different educational backgrounds. METHODS Radiographic images (PAN and CBCT) of 42 patients were examined as follows: the maxillary (MX) anterior region of patients, the MX posterior region of 16 patients and the mandibular (MD) posterior region of 16 patients. These sites were used for planning of dental implant insertion. Data sets were analyzed by examiners with different training backgrounds: three general practitioners (GP), three oral surgeons (OS) and three maxillofacial surgeons (MS). A standardized questionnaire in a standardized setting was answered by participants. RESULTS The majority of participants rated an additional CBCT as "required" (14.0%) or "reasonable" (56.1%). These ratings depended strongly on the area of interest (MX anterior region: 31.1 and 58.9%; MX posterior region: 14.6 and 62.5%; and MD posterior region: 2.8% and 47.9%). MS classified CBCT as required more often than GP and OS (23.8 vs 10.3 and 7.9%; p < 0.001). With the additional information of CBCT, "therapy affecting" ratings were stated high in all groups. CONCLUSIONS Especially in the anterior and posterior MX, significant subjective benefits for an additional CBCT were seen for planning of dental implant procedures. Participants with fundamental medical education asked for CBCT more often. The results indicate that an improved education in three-dimensional dental radiology is necessary.
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Affiliation(s)
- Michael Dau
- 1 Department of Oral, Maxillofacial and Plastic Facial Surgery, University Medical Centre, University of Rostock, Germany
| | - Amir Edalatpour
- 2 Department of Oral and Maxillofacial Surgery and Plastic Surgery, University Medical Centre, Johannes Gutenberg University of Mainz, Mainz, Germany
| | - Ralf Schulze
- 3 Department of Oral Surgery, University Medical Centre, Johannes Gutenberg University of Mainz, Mainz, Germany
| | - Bilal Al-Nawas
- 2 Department of Oral and Maxillofacial Surgery and Plastic Surgery, University Medical Centre, Johannes Gutenberg University of Mainz, Mainz, Germany
| | - Abdulmonem Alshihri
- 4 Department of Prosthetic and Biomaterial Sciences, King Saud University, Riyadh, Saudi Arabia.,5 Harvard School of Dental Medicine, Harvard University, Boston, MA, USA
| | - Peer W Kämmerer
- 1 Department of Oral, Maxillofacial and Plastic Facial Surgery, University Medical Centre, University of Rostock, Germany
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Choi E, Ford NL. Measuring absorbed dose for i-CAT CBCT examinations in child, adolescent and adult phantoms. Dentomaxillofac Radiol 2015; 44:20150018. [PMID: 25785822 DOI: 10.1259/dmfr.20150018] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES Design and construct child and adolescent head phantoms to measure the absorbed doses imparted during dental CBCT and compare with the absorbed dose measured in an adult phantom. METHODS A child phantom was developed to represent the smallest patients receiving CBCT, usually for craniofacial developmental concerns, and an adolescent phantom was developed to represent healthy orthodontic patients. Absorbed doses were measured using a thimble ionization chamber for the custom-built child and adolescent phantoms and compared with measurements using a commercially available adult phantom. Imaging was performed with an i-CAT Next Generation (Imaging Sciences International, Hatfield, PA) CBCT using two different fields of view covering the craniofacial complex (130 mm high) or maxilla/mandible (60 mm high). RESULTS Measured absorbed doses varied depending on the location of the ionization chamber within the phantoms. For CBCT images obtained using the same protocol for all phantoms, the highest absorbed dose was measured in all locations of the small child phantom. The lowest absorbed dose was measured in the adult phantom. CONCLUSIONS Images were obtained with the same protocol for the adult, adolescent and child phantoms. A consistent trend was observed with the highest absorbed dose being measured in the smallest phantom (child), while the lowest absorbed dose was measured in the largest phantom (adult). This study demonstrates the importance of child-sizing the dose by using dedicated paediatric protocols optimized for the imaging task, which is critical as children are more sensitive to harmful effects of radiation and have a longer life-span post-irradiation for radiation-induced symptoms to develop than do adults.
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Affiliation(s)
- E Choi
- Department of Oral Biological and Medical Sciences, The University of British Columbia, Vancouver, BC, Canada
| | - N L Ford
- Department of Oral Biological and Medical Sciences, The University of British Columbia, Vancouver, BC, Canada
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