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Madi M, Alsaad SS, AlAssiry N, Attia D, AlAssiry M, Zakaria O. Multilevel Modeling Analysis of Odontogenic Risk Factors and Nasal Septum Deviation Associated with Maxillary Sinus Mucosal Thickening: A Cone-Beam Computed Tomography Study. Dent J (Basel) 2024; 12:74. [PMID: 38534298 DOI: 10.3390/dj12030074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 02/29/2024] [Accepted: 03/07/2024] [Indexed: 03/28/2024] Open
Abstract
(1) Background: In this study, the impact of odontogenic risk factors with nasal septum deviation on maxillary sinus mucosal thickening was assessed using Cone-beam computed tomography CBCT. (2) Methods: A total of 328 maxillary sinus regions from 164 patients (85 males and 79 females) were examined. Images were interpreted by dental specialists and Otolaryngologists. Coronal and sagittal sections were examined to assess the proximity of the root tips of posterior maxillary teeth (RPMT) to the maxillary sinus. The periodontal bone loss for all maxillary posterior teeth was also assessed. Consequently, maxillary sinus mucosal thickening (MT) was further classified into three gradings. Multilevel modeling regression analysis was used due to the hierarchical structuring of the data. Four models were developed, a null model with no factors, a model with tooth-level factors (RPMT, PBL, tooth condition, and root length), a model with patient-level factors (gender and nasal septum deviation), and a model with combined patient- and tooth-level factors. Regression estimates (AOR) and 95% confidence intervals (CIs) of individual and tooth factors were calculated. (3) Results: Multilevel regression analysis showed that RPMT was significantly associated with MT of maxillary sinus (p < 0.001), where patients who had RPMT > 0 had higher odds of MT of maxillary sinus. Tooth condition was also found to be significantly associated with MT of maxillary sinus, where teeth with failed RCT (p < 0.001) and teeth with restorations (p < 0.008) had higher odds of MT of maxillary sinus (AOR = 2.87, 95%CI 1.65, 4.42, AOR = 1.64, 95%CI 1.14, 2.36, respectively). (4) Conclusions: In order to plan preoperative treatment for maxillary posterior teeth, it is important to assess the anatomical relationship between the sinus floor and the root tips of the maxillary posterior teeth. Additionally, we establish a better understanding of the clinician before surgical intervention is conducted.
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Affiliation(s)
- Marwa Madi
- Department of Preventive Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia
| | - Sara S Alsaad
- Department of Preventive Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia
| | - Nada AlAssiry
- Department of Preventive Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia
| | - Dina Attia
- Department of Pediatric Dentistry and Dental Public Health, Faculty of Dentistry, Alexandria University, Alexandria 21527, Egypt
| | - Mansour AlAssiry
- Department of Otolaryngology, King Fahad Specialist Hospital, Dammam 32253, Saudi Arabia
| | - Osama Zakaria
- Department of Biomedical Dental Science, College of Dentistry, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia
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Lam M, Dekel E, Nucci L, Grassia V, Naoumova J, Pacheco-Pereira C, Perillo L, Chaushu S, Flores-Mir C. The effect of the dental follicle volume of palatally impacted canines on the relative position of the adjacent teeth. Eur J Orthod 2024; 46:cjad071. [PMID: 38001047 DOI: 10.1093/ejo/cjad071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2023]
Abstract
OBJECTIVE To assess if the dental follicle volume of palatally impacted canines (PICs) affects the relative root position of the adjacent lateral incisors (LIs) and first premolars (FPs). MATERIALS AND METHODS A retrospective cross-sectional study of 49 patients with unilaterally PICs with dental follicles who had CBCT imaging previously taken. Four orthodontic centers in different countries provided the sample. A mean difference of 5° between the angular measurements (mesiodistal tip, buccolingual inclination, or mesiodistal rotation) of the LI and FP adjacent to the PIC and the controls was considered clinically relevant. A value of 0.05 was set for significance level and a power of 80%. The minimum sample size was determined to be 26 patients. These patients were further assigned to an LI sample (n = 49) and an FP sample (n = 23), dependent on the direct contact of the dental follicle to that adjacent tooth. A manual segmentation technique was used to obtain the volumetric measurements of the dental follicle. Angular measurements of adjacent teeth were then compared to the contralateral nonimpacted side, which acted as the control. A multivariant regression analysis was performed using IBM SPSS software, and statistical significance was set at α = 0.05. RESULTS Adequate intra-rater reliability was accomplished. The multivariant regression analysis implied that there is no difference in the mean change in the tip, torque, and rotation of the LI and FP between the impacted and control sides when dental follicle volumes are considered (P = .509 for the LI sample and P = .804 for the FP sample). LIMITATIONS CBCT imaging of dental follicle border delimitations, partial volume effect, and scattering are limitations. This is a convenience sample where the FP subsample is small. CONCLUSION The dental follicle volume of the PICs does not seem to influence the relative position of the adjacent LI and FP mesiodistal tip, buccolingual inclination, and mesiodistal rotation. Early intervention could have been suggested to avoid certain malocclusion traits if significant displacements were demonstrated.
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Affiliation(s)
- Michael Lam
- Private Practice in Orthodontics, Saskatoon, SK, Canada
| | - Eyal Dekel
- Department of Orthodontics, Hebrew University of Jerusalem, Hadassah Medical Center, Jerusalem, Israel
| | - Ludovica Nucci
- Multidisciplinary Department of Medical-Surgical and Dental Specialties, Universita degli Studi della Campania Luigi Vanvitelli, Naples, Italy
| | - Vicenzo Grassia
- Multidisciplinary Department of Medical-Surgical and Dental Specialties, Universita degli Studi della Campania Luigi Vanvitelli, Naples, Italy
| | - Julia Naoumova
- Institute of Odontology at Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | | | - Letizia Perillo
- Multidisciplinary Department of Medical-Surgical and Dental Specialties, Universita degli Studi della Campania Luigi Vanvitelli, Naples, Italy
| | - Stella Chaushu
- Department of Orthodontics, Hebrew University of Jerusalem, Hadassah Medical Center, Jerusalem, Israel
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Lin ST, Foote AK, Bolas NM, Peter VG, Pokora R, Patrick H, Sargan DR, Murray RC. Three-Dimensional Imaging and Histopathological Features of Third Metacarpal/Tarsal Parasagittal Groove and Proximal Phalanx Sagittal Groove Fissures in Thoroughbred Horses. Animals (Basel) 2023; 13:2912. [PMID: 37760312 PMCID: PMC10525482 DOI: 10.3390/ani13182912] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 09/11/2023] [Accepted: 09/12/2023] [Indexed: 09/29/2023] Open
Abstract
Fissure in the third metacarpal/tarsal parasagittal groove and proximal phalanx sagittal groove is a potential prodromal pathology of fracture; therefore, early identification and characterisation of fissures using non-invasive imaging could be of clinical value. Thirty-three equine cadaver limbs underwent standing cone-beam (CB) computed tomography (CT), fan-beam (FB) CT, low-field magnetic resonance imaging (MRI), and macro/histo-pathological examination. Imaging diagnoses of fissures were compared to microscopic examination. Imaging features of fissures were described. Histopathological findings were scored and compared between locations with and without fissures on CT. Microscopic examination identified 114/291 locations with fissures. The diagnostic sensitivity and specificity were 88.5% and 61.3% for CBCT, 84.1% and 72.3% for FBCT, and 43.6% and 85.2% for MRI. Four types of imaging features of fissures were characterised on CT: (1) CBCT/FBCT hypoattenuating linear defects, (2) CBCT/FBCT striated hypoattenuated lines, (3) CBCT/FBCT subchondral irregularity, and (4) CBCT striated hypoattenuating lines and FBCT subchondral irregularity. Fissures on MRI appeared as subchondral bone hypo-/hyperintense defects. Microscopic scores of subchondral bone sclerosis, microcracks, and collapse were significantly higher in locations with CT-identified fissures. All imaging modalities were able to identify fissures. Fissures identified on CT were associated with histopathology of fatigue injuries.
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Affiliation(s)
- Szu-Ting Lin
- Department of Veterinary Medicine, University of Cambridge, Madingley Rd., Cambridge CB3 0ES, UK;
| | - Alastair K. Foote
- Rossdales Veterinary Surgeons, Cotton End Rd., Exning, Newmarket CB8 7NN, UK; (A.K.F.); (V.G.P.); (R.P.); (R.C.M.)
| | - Nicholas M. Bolas
- Hallmarq Veterinary Imaging, Unit 5 Bridge Park, Merrow Lane, Guildford GU4 7BF, UK;
| | - Vanessa G. Peter
- Rossdales Veterinary Surgeons, Cotton End Rd., Exning, Newmarket CB8 7NN, UK; (A.K.F.); (V.G.P.); (R.P.); (R.C.M.)
| | - Rachel Pokora
- Rossdales Veterinary Surgeons, Cotton End Rd., Exning, Newmarket CB8 7NN, UK; (A.K.F.); (V.G.P.); (R.P.); (R.C.M.)
| | - Hayley Patrick
- Swayne and Partners Veterinary Surgeons, Western Way, Bury St Edmunds IP33 3SP, UK;
| | - David R. Sargan
- Department of Veterinary Medicine, University of Cambridge, Madingley Rd., Cambridge CB3 0ES, UK;
| | - Rachel C. Murray
- Rossdales Veterinary Surgeons, Cotton End Rd., Exning, Newmarket CB8 7NN, UK; (A.K.F.); (V.G.P.); (R.P.); (R.C.M.)
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Ierardi AM, Carnevale A, Stellato E, De Lorenzis E, Uccelli L, Dionigi G, Giganti M, Montanari E, Carrafiello G. Cone Beam Computed Tomography Image Fusion with Cross Sectional Images for Percutaneous Renal Tumor Ablation: Preliminary Data. Technol Cancer Res Treat 2023; 22:15330338231154994. [PMID: 36991549 PMCID: PMC10064458 DOI: 10.1177/15330338231154994] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023] Open
Abstract
PURPOSE Percutaneous ablative treatments in the kidney are now standard options for local cancer therapy. Multimodality image guidance, combining two 3D image sets, may improve procedural images and interventional strategies. We aimed to assess the value of intra-procedural cone beam computed tomography (CBCT) with magnetic resonance (MR) or CT imaging fusion technique in the guidance of percutaneous microwave ablation (MWA) of renal neoplasms. MATERIALS AND METHODS Fifteen patients (eight males, seven females, median age 65 years, median lesion size 20 mm) underwent percutaneous MWA for 15 renal tumors. All the procedures were performed in a dedicated angiography room setting; CBCT ablation planning capabilities included multimodality image fusion. Preoperative contrast-enhanced CT was available in 12 patients, whereas magnetic resonance imaging in the remaining. All patients were considered inoperable due to comorbidities, advanced age, and/or refusal to undergo surgery. Exclusion criteria were: tumors visible at unenhanced CBCT, metastatic disease, and uncorrected coagulopathy. Technical success and technical effectiveness were calculated. Procedural time, complications and recurrences were registered. RESULTS MWA under CBCT-guidance with fusion technique was technically successful in 14 out of 15 cases (93%). The median procedural time was 45 min. No procedure-related complications were reported. No enhancing tissue was visualized in the area of ablation at 1-month follow-up. All 15 cases were recurrence-free at last follow-up assessment (median follow-up of 12 months); no cancer-specific deaths were registered. CONCLUSION CBCT-CT/MR image fusion is technically feasible and safe in achieving correct targeting and complete ablation of renal lesions. This approach bears the potential to overcome most of the limitations of unenhanced CBCT guidance alone; larger series are needed to validate this technique.
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Affiliation(s)
- Anna Maria Ierardi
- Radiology Unit, 9339Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Aldo Carnevale
- Radiology Unit, Department of Translational Medicine, 9299University of Ferrara, Ferrara, Italy
| | - Elvira Stellato
- Postgraduate School of Radiodiagnostics, 9304University of Milan, Milan, Italy
| | - Elisa De Lorenzis
- Urology Unit, 9339Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Licia Uccelli
- Radiology Unit, Department of Translational Medicine, 9299University of Ferrara, Ferrara, Italy
| | - Gianlorenzo Dionigi
- Department of Pathophysiology and Transplantation, 9304University of Milan, Milan, Italy
| | - Melchiore Giganti
- Radiology Unit, Department of Translational Medicine, 9299University of Ferrara, Ferrara, Italy
| | - Emanuele Montanari
- Urology Unit, 9339Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
- Department of Clinical Sciences and Community Health, 9304University of Milan, Milan, Italy
| | - Gianpaolo Carrafiello
- Radiology Unit, 9339Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
- Department of Health Sciences, 9304University of Milan, Milan, Italy
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Chaves LLV, Lopes Rosado LP, Piccolo SM, Ferreira LM, Kamburoglu K, Junqueira RB, Aquino de Castro MA, Verner FS. Evaluation of the Maxillary Sinus of Patients with Maxillary Posterior Implants: A CBCT Cross-Sectional Study. Diagnostics (Basel) 2022; 12:diagnostics12123169. [PMID: 36553176 PMCID: PMC9777801 DOI: 10.3390/diagnostics12123169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 12/09/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND During oral rehabilitation, dental implants in the posterior maxilla can penetrate the maxillary sinus. The aim was to evaluate the presence of maxillary sinus abnormalities in patients with dental implants in the posterior maxillary region using cone-beam computed tomography (CBCT) images. MATERIALS AND METHODS This was a retrospective cross-sectional study, and CBCT scans of 199 patients (459 dental implants) were evaluated. Implants were assessed according to their relative location to the maxillary sinus floor (up to 2 mm from the maxillary sinus cortex, within 2 mm to intimate contact with the maxillary sinus cortex, apical third inside the maxillary sinus, two-thirds or more inside the maxillary sinus) and bone-fixation tissue (Alveolar ridge or Bone graft). Maxillary sinus abnormalities were classified. Kappa and Weighted Kappa and the Kruskal-Wallis test were applied. RESULTS A higher prevalence of mucosal thickening and non-specific opacification were observed in implants located within 2 mm to intimate contact with the cortex of the maxillary sinus floor. Of the 66 implants with apical thirds located inside the maxillary sinus, 31 (46.7%) were associated with sinus abnormalities and of all implants (n = 5) with two-thirds or more located inside the maxillary sinus, all of these were associated with sinus abnormalities. No association was observed in relation to implant bone-fixation tissue. CONCLUSIONS This study found a significant association between dental implant placement near or within the sinus and sinus abnormalities, mainly mucosal thickening and non-specific opacification.
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Affiliation(s)
- Lucas Lenyn Vieira Chaves
- Department of Dentistry, Governador Valadares Campus, Federal University of Juiz de Fora, Governador Valadares 35010-180, Brazil
| | - Lucas P. Lopes Rosado
- Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, State University of Campinas, Piracicaba 13414-903, Brazil
| | - Saulo Machado Piccolo
- School of Dentistry of Ribeirão Preto, Department of Dental Materials and Prosthesis, University of São Paulo, Ribeirão Preto 14040-904, Brazil
| | | | - Kivanç Kamburoglu
- Departament of Dentomaxillofacial Radiology, Faculty of Dentistry, Ankara University, Ankar 06560, Turkey
| | - Rafael Binato Junqueira
- Department of Dentistry, Governador Valadares Campus, Federal University of Juiz de Fora, Governador Valadares 35010-180, Brazil
| | | | - Francielle Silestre Verner
- Department of Dentistry, Governador Valadares Campus, Federal University of Juiz de Fora, Governador Valadares 35010-180, Brazil
- Correspondence:
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Jolivet G, Huck O, Petit C. Evaluation of furcation involvement with diagnostic imaging methods: a systematic review. Dentomaxillofac Radiol 2022; 51:20210529. [PMID: 35787071 PMCID: PMC9717400 DOI: 10.1259/dmfr.20210529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 06/09/2022] [Accepted: 07/01/2022] [Indexed: 12/15/2022] Open
Abstract
OBJECTIVE Multirooted teeth respond less favorably to non-surgical periodontal treatment and long-term tooth prognosis is influenced by the degree of furcation involvement (FI). Therapeutic strategy for multirooted teeth is essentially based on accurate diagnosis of the FI. The aim of this systematic review is to evaluate the accuracy of the different furcation assessment methods and to determine if radiographic help is needed to determine early stage of FI. METHODS Electronic databases were searched up to March 2021. Comparative studies describing the reliability of different clinical and/or radiological furcation assessment methods were identified. RESULTS A total of 22 studies comparing at least 2 furcation assessment methods, among which 15 retrospective studies, 5 prospective studies, 1 randomized controlled trial and 1 case series, were included in this review. The reliability of cone beam CT (CBCT), intraoral radiographs (IOs), orthopantomograms (OPGs) and MRI to identify FI was evaluated. Using OFS as a reference for FI detection and diagnosis, agreement ranged from 43.3 to 63% for OPG, 38.7 to 83.1% for IO and 82.4 to 84% for CBCT. The validity of the measurements was mainly influenced by the location of the furcation entrance. For radiological diagnosis, CBCT displayed the closest agreement with OFS while the accuracy of IO and OPG showed modest agreement and were influenced by the examiner's experience. CONCLUSION Altogether, it appears that the use of IO, OPG or CBCT allows detection of FI but could not be considered as gold-standard techniques.
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Faragó T, Gasilov S, Emslie I, Zuber M, Helfen L, Vogelgesang M, Baumbach T. Tofu: a fast, versatile and user-friendly image processing toolkit for computed tomography. J Synchrotron Radiat 2022; 29:916-927. [PMID: 35511025 PMCID: PMC9070706 DOI: 10.1107/s160057752200282x] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 03/14/2022] [Indexed: 06/01/2023]
Abstract
Tofu is a toolkit for processing large amounts of images and for tomographic reconstruction. Complex image processing tasks are organized as workflows of individual processing steps. The toolkit is able to reconstruct parallel and cone beam as well as tomographic and laminographic geometries. Many pre- and post-processing algorithms needed for high-quality 3D reconstruction are available, e.g. phase retrieval, ring removal and de-noising. Tofu is optimized for stand-alone GPU workstations on which it achieves reconstruction speed comparable with costly CPU clusters. It automatically utilizes all GPUs in the system and generates 3D reconstruction code with minimal number of instructions given the input geometry (parallel/cone beam, tomography/laminography), hence yielding optimal run-time performance. In order to improve accessibility for researchers with no previous knowledge of programming, tofu contains graphical user interfaces for both optimization of 3D reconstruction parameters and batch processing of data with pre-configured workflows for typical computed tomography reconstruction. The toolkit is open source and extensive documentation is available for both end-users and developers. Thanks to the mentioned features, tofu is suitable for both expert users with specialized image processing needs (e.g. when dealing with data from custom-built computed tomography scanners) and for application-specific end-users who just need to reconstruct their data on off-the-shelf hardware.
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Affiliation(s)
- Tomáš Faragó
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology (KIT), Herrmann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Sergey Gasilov
- Canadian Light Source, 44 Innovation Blvd, Saskatoon, Canada S7N 2V3
| | - Iain Emslie
- Canadian Light Source, 44 Innovation Blvd, Saskatoon, Canada S7N 2V3
| | - Marcus Zuber
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology (KIT), Herrmann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, Kaiserstrasse 12, 76131 Karlsruhe, Germany
| | - Lukas Helfen
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology (KIT), Herrmann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
| | - Matthias Vogelgesang
- Institute for Data Processing and Electronics, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Tilo Baumbach
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology (KIT), Herrmann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, Kaiserstrasse 12, 76131 Karlsruhe, Germany
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Chang S, Lee SC. A Comparative Study on the Voxel Values in Alveolar Bones Acquired by MDCT and Newly Developed Dental Dual-Energy CBCT. Sensors (Basel) 2021; 21:7552. [PMID: 34833629 DOI: 10.3390/s21227552] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 11/02/2021] [Accepted: 11/10/2021] [Indexed: 01/23/2023]
Abstract
The purpose of this study was to analyze the effectiveness of newly developed dental dual-energy (DE) cone-beam computed tomography (CBCT) to compare both the voxel values in hard bone tissue of DE-CBCT and multidetector computed tomography (MDCT) images, collected in a clinical trial conducted at Seoul National University Dental Hospital. A software implemented as a scripted module of a three-dimensional (3D) slicer was developed to register the volume data from the MDCT space to DE-CBCT, locate the same 3D regions of interest (ROIs) in each image space, and extract the statistics of the ROIs. The mean values were paired and used as representative values of the ROIs. A scatter plot with the line of equality and Bland–Altman (BA) plot of difference for a pair of measured means were used for statistical analysis. Of the ROI pairs, 96% were within ±15% from the identity line, and more than 95% of the measured ROI pairs were within the limits of agreement of the 95% confidence intervals (CIs), with the CI of the limits in BA plots. The newly developed dental DE-CBCT showed a level of voxel value accuracy similar to that of MDCT.
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Ito M, Hayashi Y, Matsumoto K, Arai Y, Honda K. Evaluation of cone-beam computed tomography over a small field of view in a water bath based on the modulation transfer function with repeating-edge oversampling. J Oral Sci 2020; 63:87-91. [PMID: 33311013 DOI: 10.2334/josnusd.20-0479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
PURPOSE The spatial resolution of cone-beam computed tomography (CBCT) in small fields of view (FOVs) is important for clinical applications. However, it is difficult to measure spatial resolution reliably due to error factors such as noise. The aim of this study was to obtain a modulation transfer function (MTF) more accurately. METHODS A CBCT apparatus was used with small FOV. An aluminum pipe slightly tilted at an inclination ratio of 77/3 (25.7) was used as the measurement phantom. The MTF was calculated from the edge image of the phantom. The actual oversampling ratio was determined by regression analysis. The experiment was repeated 16 times and the edge-spread function (ESF) was approximated by the least-square method. Furthermore, a low-pass filter (LPF) was applied to eliminate the component at frequencies above the Nyquist frequency. Finally, the MTF was calculated from the pre-processed ESF. RESULTS Results showed that pre-processing reduced the noise of the ESF. The MTFs at frequencies of 1.0 and 2.0 LP/mm were 0.59 and 0.18, respectively, in air and 0.52 and 0.16, respectively, in water. CONCLUSION The repeating-edge oversampling method combined with ESF pre-processing improved the accuracy of the MTF under clinically relevant conditions with a phantom.
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Affiliation(s)
- Motohiro Ito
- Department of Oral and Maxillofacial Radiology, Nihon University School of Dentistry
| | - Yusuke Hayashi
- Department of Oral and Maxillofacial Radiology, Nihon University School of Dentistry
| | - Kunihito Matsumoto
- Department of Oral and Maxillofacial Radiology, Nihon University School of Dentistry.,Division of Advanced Dental Treatment, Dental Research Center, Nihon University School of Dentistry
| | - Yoshinori Arai
- Department of Oral and Maxillofacial Radiology, Nihon University School of Dentistry.,Division of Advanced Dental Treatment, Dental Research Center, Nihon University School of Dentistry
| | - Kazuya Honda
- Department of Oral and Maxillofacial Radiology, Nihon University School of Dentistry.,Division of Advanced Dental Treatment, Dental Research Center, Nihon University School of Dentistry
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Assouline SL, Meyer C, Weber E, Chatelain B, Barrabe A, Sigaux N, Louvrier A. How useful is intraoperative cone beam computed tomography in maxillofacial surgery? An overview of the current literature. Int J Oral Maxillofac Surg 2020; 50:198-204. [PMID: 32605822 DOI: 10.1016/j.ijom.2020.05.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2019] [Revised: 03/29/2020] [Accepted: 05/12/2020] [Indexed: 10/24/2022]
Abstract
Intraoperative imaging is increasingly used by surgeons and has become an integral part of many surgical procedures. This study was performed to provide an overview of the current literature on the intraoperative use of cone beam computed tomography (CBCT) imaging in maxillofacial surgery. A bibliographic search of PubMed was conducted in March 2020, without time limitation, using "intraoperative imaging" AND "maxillofacial surgery" AND "cone beam computed tomography" as key words. Ninety-one articles were found; after complete reading, 16 articles met the eligibility criteria and were analysed. The results showed that the majority of the indications were related to maxillofacial trauma, particularly zygomaticomaxillary complex fractures. Final verification with intraoperative CBCT before wound closure was the most common use of this device. However, innovative uses of intraoperative CBCT are expanding, such as CBCT coupling with mirror computational planning, and even the combined use of initial intraoperative CBCT acquisition with navigation. Immediate, fast, and easy evaluation of bone repositioning to avoid the need for further surgical revision is the main advantage of this technique. Imaging quality is comparable to that of multi-slice computed tomography, but with lower radiation exposure. Nevertheless, CBCT is still not widely available in maxillofacial centres, probably because of its cost, and perhaps because not everyone is aware of its advantages and versatility, which are reported in this review.
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Affiliation(s)
- S L Assouline
- Department of Oral and Maxillofacial Surgery, University Hospital of Besançon, Besançon, France; Department of Oral and Maxillofacial Surgery, University Hospital of Strasbourg, Strasbourg, France.
| | - C Meyer
- Department of Oral and Maxillofacial Surgery, University Hospital of Besançon, Besançon, France; University of Bourgogne Franche- Comté, UFR SMP, Besançon, France; NanomedicineLab, Imagery and Therapeutics, EA 4662, Medical Faculty, University of Franche-Comté, Besançon, France
| | - E Weber
- Department of Oral and Maxillofacial Surgery, University Hospital of Besançon, Besançon, France
| | - B Chatelain
- Department of Oral and Maxillofacial Surgery, University Hospital of Besançon, Besançon, France
| | - A Barrabe
- Department of Oral and Maxillofacial Surgery, University Hospital of Besançon, Besançon, France; University of Bourgogne Franche- Comté, UFR SMP, Besançon, France
| | - N Sigaux
- Department of Maxillofacial and Facial Plastic Surgery, Lyon Sud Hospital, Hospices Civils de Lyon, Claude-Bernard Lyon 1 University, Pierre-Bénite, France; 3d.FAB platform, ICBMS, CNRS 5246 Claude-Bernard Lyon 1 University, Villeurbanne, France
| | - A Louvrier
- Department of Oral and Maxillofacial Surgery, University Hospital of Besançon, Besançon, France; University of Bourgogne Franche- Comté, UFR SMP, Besançon, France; University of Bourgogne Franche- Comté, INSERM, EFS BFC, UMR1098, Interactions Hôte-Greffon- Tumeur/Ingénierie Cellulaire et Génique, Besançon, France
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11
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Sghaireen MG. Thickening of Schneiderian membrane secondary to periapical lesions: A retrospective radiographic analysis. J Int Soc Prev Community Dent 2020; 10:316-322. [PMID: 32802778 PMCID: PMC7402264 DOI: 10.4103/jispcd.jispcd_101_20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Revised: 03/23/2020] [Accepted: 03/26/2020] [Indexed: 12/18/2022] Open
Abstract
Aim: The aim of this study was to investigate the possible correlation between adjacent periapical lesions of maxillary teeth and Schneiderian membrane thickness (SMT). Materials and Methods: An analytical study of case-control study design was conducted. From the archives, cone beam computed tomography (CBCT) images of 83 patients with periapical lesion in any of the maxillary posterior teeth were randomly selected as the case group. The normal, contralateral teeth in the same patient were considered in the control group. Eighty-eight teeth were considered in each group, comprising a total sample of 176. For each sample in case group, the distance from the border of the periapical lesion to the cortical bone of the bony floor of the maxillary sinus and SMT were measured. SMT on the contralateral side adjacent to the healthy (control) teeth was also measured. Data were presented in mean ± standard deviation and inferential statistics was performed using independent t test and analysis of variance (ANOVA). Later Pearson correlation and multiple linear logistic regression were carried out using Statistical Package for the Social Sciences software program, version 21.0 at 95% confidence interval. Results: Teeth with periapical lesion were found to have significantly (P < 0.001) increased SMT when compared with that of adjacent to healthy teeth. On the contrary, nonsignificant differences were found in SMT when genders and age groups were compared (P = 0.295 and 0.060, respectively). A strong negative correlation was observed between distance of the lesion to the sinus and SMT (P = 0.003). Conclusion: Neighboring periapical lesions of maxillary teeth are associated with SMT that is worsened when the lesion is close to the sinus.
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Affiliation(s)
- Mohammed G Sghaireen
- Department of Prosthetic Dental Sciences, College of Dentistry, Jouf University, Sakaka, Kingdom of Saudi Arabia
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Bernasconi A, De Franco C, Improta G, Verrazzo R, Balato G, Rizzo M, Lenzi M, Smeraglia F. Foot and ankle measurements on cone beam weightbearing computed tomography. J BIOL REG HOMEOS AG 2020; 34:23-32. ADVANCES IN MUSCULOSKELETAL DISEASES AND INFECTIONS-SOTIMI 2019. [PMID: 32856436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Over the last years, an increased number of studies have reported the use of cone beam weightbearing computed tomography (WBCT) in the assessment of foot and ankle pathology. This new technology has enabled to overcome the limits inherently related to two-dimensional radiographs (superimposition bias, operator-related bias, rotation bias) and to obtain images reproducing the bones and joints anatomy during physiological standing with a low radiation dose. We performed a review of the current literature to summarize the evidence about the use of 2D or 3D measurements on WBCT images in various foot and ankle conditions. Our aims were to describe measurements proposed so far and to report data on reliability and validity from primary authors.
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Affiliation(s)
- A Bernasconi
- Department of Public Health, Section of Orthopaedic Surgery, "Federico II" University, Naples Italy
| | - C De Franco
- Department of Public Health, Section of Orthopaedic Surgery, "Federico II" University, Naples Italy
| | - G Improta
- Department of Public Health, Section of Orthopaedic Surgery, "Federico II" University, Naples Italy
| | - R Verrazzo
- Department of Public Health, Section of Orthopaedic Surgery, "Federico II" University, Naples Italy
| | - G Balato
- Department of Public Health, Section of Orthopaedic Surgery, "Federico II" University, Naples Italy
| | - M Rizzo
- Department of Public Health, Section of Orthopaedic Surgery, "Federico II" University, Naples Italy
| | - M Lenzi
- Department of Public Health, Section of Orthopaedic Surgery, "Federico II" University, Naples Italy
| | - F Smeraglia
- Department of Public Health, Section of Orthopaedic Surgery, "Federico II" University, Naples Italy
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Lintz F, Bernasconi A, Baschet L, Fernando C, Mehdi N, de Cesar Netto C. Relationship Between Chronic Lateral Ankle Instability and Hindfoot Varus Using Weight-Bearing Cone Beam Computed Tomography. Foot Ankle Int 2019; 40:1175-1181. [PMID: 31253045 DOI: 10.1177/1071100719858309] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND Varus hindfoot deformity may increase the risk of chronic lateral ankle instability (CLAI). Our aim was to analyze hindfoot alignment (HFA) in patients with CLAI using weight-bearing cone beam computed tomography (WBCT) to assess this risk. METHODS This retrospective, comparative analysis was carried out using an existing WBCT database (Talas, CurveBeam LLC), including data sets for 370 consecutive feet (189 patients) obtained between July 2016 and October 2018 at a single institution. The software provided semiautomated measurement of HFA, given as foot ankle offset (FAO). Univariate analysis was conducted to compare feet with and without CLAI against sex, age, body mass index, and FAO. Significant variables were included in a multivariable logistic model with random effects to take into account correlation between feet of the same patient. RESULTS Forty-three feet had CLAI (34 patients). FAO (P = .0009) was significant for CLAI by univariate analysis. Mean FAO was -2.2% ± 5.5% (varus) and + 2.6% ± 4.7% (valgus) with and without CLAI history, respectively. Multivariable logistic regression adjusted for sex and age demonstrated a 35% increased odds ratio (OR) of CLAI per 1% reduction in FAO value (varus) (adjusted OR=0.64, 95% confidence interval [CI]: 0.49-0.84; P = .001) and no significant effect of sex (adjusted OR=0.52; P = .617) or age (adjusted OR=0.94; P = .165) after adjustment for FAO. CONCLUSION A positive relationship was found between varus HFA and the risk to have CLAI. Systematic recording of FAO measurements from WBCT images along with clinical data regarding CLAI history proved successful at quantifying the risk of CLAI. LEVEL OF EVIDENCE Level III, retrospective cohort study.
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Affiliation(s)
- François Lintz
- Ramsay Générale de Santé, Foot and Ankle Surgery Center, Clinique de l'Union, Saint-Jean, France
| | - Alessio Bernasconi
- Foot and Ankle Unit, Royal National Orthopaedic Hospital, Stanmore, United Kingdom.,Department of Public Health, Orthopaedic and Traumatology Unit, University of Napoli "Federico II," Napoli, Italy
| | - Louise Baschet
- Centre Hospitalier Universitaire de Bordeaux, Bordeaux, France
| | - Céline Fernando
- Ramsay Générale de Santé, Foot and Ankle Surgery Center, Clinique de l'Union, Saint-Jean, France
| | - Nazim Mehdi
- Ramsay Générale de Santé, Foot and Ankle Surgery Center, Clinique de l'Union, Saint-Jean, France
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Thakkar AN, Chinnadurai P, Breinholt JP, Lin CH. Transcatheter closure of a sinus venosus atrial septal defect using 3D printing and image fusion guidance. Catheter Cardiovasc Interv 2018; 92:353-357. [PMID: 29897667 PMCID: PMC6175141 DOI: 10.1002/ccd.27645] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 03/23/2018] [Accepted: 04/02/2018] [Indexed: 11/10/2022]
Abstract
A 63‐year‐old man with cirrhosis, hepatocellular carcinoma, and coagulopathy was diagnosed with a sinus venosus atrial septal defect (ASD) and partial anomalous pulmonary venous return (PAPVR) of the right upper pulmonary vein (RUPV). Transcatheter repair by positioning a stent graft in the superior vena cava was planned. Based on three‐dimensional (3D) reconstruction of gated cardiac CTA, a 28 mm × 7 cm Endurant II® aortic extension stent graft (Medtronic, MN) was chosen. A 3D model printed from the CTA was used to simulate device deployment, demonstrating successful exclusion of the sinus venosus ASD with return of the RUPV to the left atrium (LA). Post simulation, the 3D model was used for informed consent. The patient was then taken to the hybrid operating room. On‐table cone beam CT was performed and registered with the CTA images. This enabled overlay of 3D regions of interest to live 2D fluoroscopy. The stent graft was then deployed using 3D regions of interest for guidance. Hemodynamics and angiography demonstrated successful exclusion of the sinus venosus ASD and unobstructed return of RUPV to the LA. This is the first report of comprehensive use of contemporary imaging for planning, simulation, patient consent, and procedural guidance for patient‐centered complex structural intervention in repair of sinus venosus ASD with PAPVR. We propose this as a process model for continued innovation in structural interventions.
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Affiliation(s)
- Akanksha N Thakkar
- Houston Methodist DeBakey Heart & Vascular Center, Houston Methodist Hospital, Houston, Texas
| | | | - John P Breinholt
- Department of Pediatrics, University of Texas Health Science Center at Houston, Houston, Texas
| | - C Huie Lin
- Houston Methodist DeBakey Heart & Vascular Center, Houston Methodist Hospital, Houston, Texas
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Abstract
The 3D anatomical complexity of the foot and ankle and the importance of weight-bearing in diagnosis have required the combination of conventional radiographs and medical CT. Conventional plain radiographs (XR) have demonstrated substantial limitations such as perspective, rotational and fan distortion, as well as poor reproducibility of radiographic installations. Conventional CT produces high levels of radiation exposure and does not offer weight-bearing capabilities. The literature investigating biometrics based on 2D XR has inherent limitations due to the technology itself and thereby can focus only on whether measurements are reproducible, when the real question is whether the radiographs are. Low dose weight-bearing cone beam CT (WBCT) combines 3D and weight-bearing as well as ‘built in’ reliability validated through industry-standardized processes during production and clinical use (quality assurance testing). Research is accumulating to validate measurements based on traditional 2D techniques, and new 3D biometrics are being described and tested. Time- and cost-efficient use in medical imaging will require the use of automatic measurements. Merging WBCT and clinical data will offer new perspectives in terms of research with the help of modern data analysis techniques.
Cite this article: EFORT Open Rev 2018;3 DOI: 10.1302/2058-5241.3.170066
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Affiliation(s)
- François Lintz
- Centre de Chirurgie de la Cheville et du Pied, Clinique de l'Union, France
| | - Cesar de Cesar Netto
- Foot and Ankle Surgery Department, Hospital for Special Surgery, New York City, USA
| | - Alexeij Barg
- Foot and Ankle Surgery Department, University of Utah, USA
| | - Arne Burssens
- Foot and Ankle Surgery Department, University of Ghent, Belgium
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Li H, Hong W, Mou X, Liu Y. A novel method of micro-tomography geometric angle calibration with random phantom. J Xray Sci Technol 2017; 25:XST16178. [PMID: 28234269 DOI: 10.3233/xst-16178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The objective of this study is to develop and test the feasibility of applying a machine learning method for geometry calibration of angles in micro-tomography systems. Increasing importance of micro-tomography systems are manifested with escalating applications in various scenarios including but not limited to oral and maxillofacial surgery, vascular and intervention radiology, among other specific applications for purposes of diagnosis and treatments planning. There is possibility, however, actual pathology is confused by artifact of tissue structures after volume reconstruction as a result of CT construction errors. A Kernel Ridge Regression algorithm for micro-tomography geometry estimation and its corresponding phantom is developed and tested in this study. Several projection images of a rotating Random Phantom of some steel ball bearings in an unknown geometry with gantry angle information were utilized to calibrate both in-plane and out-plane rotation of the detector. The described method can also be expanded to calibrate other parameters of CT construction effortlessly. Using computer simulation, the study results validated that geometry parameters of micro-tomography system were accurately calibrated.
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Affiliation(s)
- Haocheng Li
- Institute of Image Processing and Pattern Recognition, School of Electronic and Information Engineering, Xi'an Jiaotong University, China
- Department of Computer Science and Engineering, The Chinese University of Hong Kong, China
| | - Wei Hong
- Institute of Image Processing and Pattern Recognition, School of Electronic and Information Engineering, Xi'an Jiaotong University, China
| | - Xuanqin Mou
- Institute of Image Processing and Pattern Recognition, School of Electronic and Information Engineering, Xi'an Jiaotong University, China
| | - Yu Liu
- Institute of Image Processing and Pattern Recognition, School of Electronic and Information Engineering, Xi'an Jiaotong University, China
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Abstract
OBJECTIVE The aim of this study was to investigate the noise power properties of a micro-computed tomography (micro-CT) system under different operating conditions. METHODS A commercial micro-CT was used in the study that used a flat panel detector with a 127-μm-pixel pitch and a micro-focus x-ray tube. Conical tubes of various diameters were used under different acquisition conditions. Multidimensional noise power spectrums were used as a metric to investigate the noise properties of the system. Noise power spectrum was calculated from the difference data generated by subtraction of 2 identical scans. The noise properties with respect to various parameters that include the impact of number of projections, x-ray spectra, milliampere-second, slice location, object diameter, voxel size, geometric magnification (M), back-projection filters, and reconstruction magnification (Mrecon) were studied. RESULTS At a same isocentric exposure rate of 270 mR/s, the noise power was much lower for the image reconstructed with 3672 views (122 seconds) as compared with the 511 views (17 seconds), whereas at a fixed isocentric exposure of 4600 mR, the noise power levels were almost similar. Image noise with a 50-kV beam was higher as compared with the 90-kV beam at a same isocentric exposure. Image noise from a 16-mm-diameter conical tube was much lower as compared with the 28- and 56-mm tubes under identical isocentric exposures. The choice of back-projection filter influences noise power spectrum curves in terms of width and amplitudes. Reconstruction magnification applied during the reconstruction process increased the noise power at lower spatial frequencies but reduced the noise power at higher spatial frequencies. It can be established that, for small details corresponding to high spatial frequencies, reconstruction magnification can provide an improved signal-to-noise ratio. At all spatial frequencies, the in-plane images had lower noise power levels as compared with the z-plane images. CONCLUSIONS The noise power properties investigated in this study provide important image quality references for refined cone beam system development, optimization, and operations.
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Affiliation(s)
- Muhammad U Ghani
- From the *Center for Biomedical Engineering and School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK; †Department of Imaging Physics, The University of Texas MD Anderson Cancer Center, Houston, TX; and ‡Department of Radiation, Massachusetts General Hospital, Boston, MA
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Li W, Bootsma G, Von Schultz O, Carlsson P, Laperriere N, Millar BA, Jaffray D, Chung C. Preliminary Evaluation of a Novel Thermoplastic Mask System with Intra-fraction Motion Monitoring for Future Use with Image-Guided Gamma Knife. Cureus 2016; 8:e531. [PMID: 27081592 PMCID: PMC4829406 DOI: 10.7759/cureus.531] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Objectives A non-invasive immobilization system consisting of a thermoplastic mask with image-guidance using cone-beam CT (CBCT) and infrared (IR) tracking has been developed to ensure minimal inter- and intra-fractional movement during Gamma Knife radiosurgery. Prior to clinical use for patients on a Gamma Knife, this study clinically evaluates the accuracy and stability of this novel immobilization system with image-guidance in patients treated with standard fractionated radiation therapy on a linear accelerator. Materials & methods This prospective cohort study evaluated adult patients planned for fractionated brain radiotherapy. Patients were immobilized with a thermoplastic mask (with the nose cut out) and customized head cushion. A reflective marker was placed on the patient’s nose tip and tracked with a stereoscopic IR camera throughout treatment. For each fraction, a pre-treatment, verification (after any translational correction for inter-fraction set-up variation), and post-treatment CBCT was acquired to evaluate inter- and intra-fraction movement of the target and nose. Intra-fraction motion of the nose tip measured on CBCT and IR tracking were compared. Results Corresponding data from 123 CBCT and IR datasets from six patients are summarized. The mean ± standard deviation (SD) intra-fraction motion of the nose tip was 0.41±0.36 mm based on pre- and post-treatment CBCT data compared with 0.56±0.51 mm using IR tracking. The maximum intra-fraction motion of the nose tip was 1.7 mm using CBCT and 3.2 mm using IR tracking. The mean ± SD intra-fraction motion of the target was 0.34±0.25 mm, and the maximum intra-fraction motion was 1.5 mm. Conclusions: This initial clinical evaluation of the thermoplastic mask immobilization system using both IR tracking and CBCT demonstrate that mean intra-fraction motion of the nose and target is small. The presence of isolated measures of larger intra-fraction motion supports the need for image-guidance and intra-fraction motion management when using this mask-based immobilization system for radiosurgery.
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Affiliation(s)
- Winnie Li
- Department of Radiation Oncology, Princess Margaret Cancer Centre, Toronto, ON
| | - Gregory Bootsma
- Radiation Medicine Program, Princess Margaret Cancer Centre, Toronto, ON / University Health Network, Toronto, ON
| | - Oscar Von Schultz
- Elekta Research & Development, Elekta Instruments AB, Stockholm, Sweden
| | - Per Carlsson
- Elekta Research & Development, Elekta Instruments AB, Stockholm, Sweden
| | - Normand Laperriere
- Department of Radiation Oncology, Princess Margaret Cancer Centre, Toronto, ON
| | - Barbara-Ann Millar
- Department of Radiation Oncology, Princess Margaret Cancer Centre, Toronto, ON
| | - David Jaffray
- Department of Radiation Oncology, Princess Margaret Cancer Centre, Toronto, ON
| | - Caroline Chung
- Radiation Medicine Program, Princess Margaret Cancer Centre, Toronto, ON / University Health Network, Toronto, ON
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Abstract
OBJECTIVE The aim of the present study was to clarify the occurrence, diameter, and location of the accessory mental foramen (AMF) using cone-beam computed tomography (CBCT) images from a sample of Turkish children. STUDY DESIGN This retrospective was carried out using a total of 275 CBCT images from child and adolescent patients were randomly selected from existing records in the Department of Oral and Maxillofacial Radiology at the University of Erciyes, Kayseri, Turkey. The mental foramen (MF) and AMF were assessed on axial, sagittal, and coronal CBCT slices. RESULTS The mean age was 10.51 ± 3.32 years, consisting of 139 males (mean age 10.64 ± 3.42) and 126 females (mean age 10.38 ± 3.18). Twenty-one AMFs were observed in 18 of 275 patients (6.5%, 10 boys and eight girls). There was no significant difference in gender in relation to the prevalence of AMF (p = 0.65). The mean area of the 21 AMFs and the MF on the side with the AMF were 0.7 mm² (SD ± 0.5) and 3.8 mm² (SD ± 2.2), respectively. CONCLUSION It is important to stress that detecting the AMN using CBCT with 3D reconstructions may reduce the risk of paralysis, hemorrhage, and postoperative pain in this region. Our study presents the first report assessing the occurrence, diameter, and location of the AMF in the pediatric population using CBCT images. In this respect, not surprisingly, the mean size of the AMF of our population is smaller than other reports in the literature that involve adult populations.
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Brown LF, Monsour P. The growth of Medicare rebatable cone beam computed tomography and panoramic radiography in Australia. Aust Dent J 2014; 60:511-9. [PMID: 25366248 DOI: 10.1111/adj.12250] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/29/2014] [Indexed: 11/29/2022]
Abstract
BACKGROUND There is a lack of objective data documenting the growth of cone beam radiology in Australia. Medicare rebates for cone beam computed tomography (CBCT) scans have been available since 1 July 2011. The aim of this study was to examine the Medicare data on the use of CBCT in order to quantify the growth of this technology over a three-year period and to assess if the growth of CBCT was impacting upon the use of dental panoramic radiology. METHODS The Medicare dataset was accessed, and data relating to the number and distribution of CBCTs and panoramic radiographs (PRs) were extracted. The data were broken down by state and territory, as well as by age group and gender of the patient, for the financial year periods July 2011 to June 2012, July 2012 to June 2013 and July 2013 to June 2014. Items relating to PRs were also extracted for the periods 2005-2008 and 2008-2011. RESULTS In the period July 2011 to June 2014, a total of 226 232 CBCTs and 2 881 351 PRs were rebated through Medicare. The rate of CBCT services provided per 100 000 population increased by 42.3% over the three-year period, whereas the rate of PRs remained fairly constant. From the age group 5-14 years through to 55-64 years, females received more CBCTs and PRs than males. The total number of PRs rebated through Medicare increased slightly over each previous three-year period (2005-2008 and 2008-2011). CONCLUSIONS There has been rapid growth of the use of CBCT over a three-year period, most marked in the State of Victoria. The higher number of CBCT examinations in females across almost all age groups, but most notably in the 15-24 years age group, raises questions about clinical decision making in the selection of cone beam imaging. There was little evidence that CBCTs were being used as a substitute for PRs, except for a small but consistent drop in the number of PRs being requested for diagnosis of surgically related dental conditions.
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Affiliation(s)
- L F Brown
- School of Dentistry, The University of Queensland, Brisbane
| | - P Monsour
- School of Dentistry, The University of Queensland, Brisbane
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Arisan V, Karabuda ZC, Avsever H, Özdemir T. Conventional multi-slice computed tomography (CT) and cone-beam CT (CBCT) for computer-assisted implant placement. Part I: relationship of radiographic gray density and implant stability. Clin Implant Dent Relat Res 2012; 15:893-906. [PMID: 22251553 DOI: 10.1111/j.1708-8208.2011.00436.x] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
PURPOSE The relationship of conventional multi-slice computed tomography (CT)- and cone beam CT (CBCT)-based gray density values and the primary stability parameters of implants that were placed by stereolithographic surgical guides were analyzed in this study. MATERIALS AND METHODS Eighteen edentulous jaws were randomly scanned by a CT (CT group) or a CBCT scanner (CBCT group) and radiographic gray density was measured from the planned implants. A total of 108 implants were placed, and primary stability parameters were measured by insertion torque value (ITV) and resonance frequency analysis (RFA). Radiographic and subjective bone quality classification (BQC) was also classified. Results were analyzed by correlation tests and multiple regressions (p < .05). RESULTS CBCT-based gray density values (765 ± 97.32 voxel value) outside the implants were significantly higher than those of CT-based values (668.4 ± 110 Hounsfield unit, p < .001). Significant relations were found among the gray density values outside the implants, ITV (adjusted r(2) = 0.6142, p = .001 and adjusted r(2) = 0.5166, p = .0021), and RFA (adjusted r(2) = 0.5642, p = .0017 and adjusted r(2) = 0.5423, p = .0031 for CT and CBCT groups, respectively). Data from radiographic and subjective BQC were also in agreement. CONCLUSIONS Similar to the gray density values of CT, that of CBCT could also be predictive for the subjective BQC and primary implant stability. Results should be confirmed on different CBCT scanners.
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Affiliation(s)
- Volkan Arisan
- Research fellow, Department of Oral Implantology, Faculty of Dentistry, Istanbul University, Istanbul, Turkey; professor, Department of Oral Implantology, Faculty of Dentistry, Istanbul University, Istanbul, Turkey; assistant professor, Department of Oral Diagnosis and Radiology, Gülhane Military Medical Academy (GATA), Center of Dental Sciences, Ankara, Turkey; professor, Department of Oral Implantology, Faculty of Dentistry, Istanbul University, Istanbul, Turkey
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Abstract
OBJECTIVE The purpose of this study was to evaluate the reliability of pixel value in CBCT, especially with regard to the effect of surrounding objects that are presented outside the field of view (FOV). MATERIALS AND METHODS This experiment used the GE Hi-Speed QXi, a multidetector helical computed tomography (MDCT) scanner, and the 3D Accuitomo FPD 8, a cone beam computed tomography (CBCT) scanner. Two types of phantoms were used, both of which contained Lipiodol Ultra Fluid (Lipiodol UF). The type A phantom was a target phantom for pixel value measurement while type B was used for the surrounding environment. For CBCT, the type A phantom was placed in a water bath, and 4 types of surrounding environmental conditions were created: (1) no other phantom present, (2) phantom type B also within the FOV, (3) half of phantom type B within the FOV, (4) phantom type B entirely outside the FOV but within the path of x-rays aimed at phantom A. RESULTS In MDCT, pixel value (CT number) showed an almost linear correlation with the concentration of Lipiodol UF. In CBCT, on the other hand, pixel value was not linearly correlated with Lipiodol UF concentration. The position of the type B phantom affected pixel values in images of the type A phantom. CONCLUSIONS Pixel value in CBCT may be affected by various conditions such as beam hardening and surrounding materials, and is therefore not reliable. Caution is essential when pixel values in CBCT are used to estimate bone density at potential implant sites.
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Affiliation(s)
- Kazuyuki Araki
- Department of Radiology, Showa University School of Dentistry, Tokyo 145-8515, Japan.
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Pachon JH, Shah J, Tornai MP. Characterization of Image Quality for 3D Scatter Corrected Breast CT Images. Proc SPIE Int Soc Opt Eng 2011; 7961:10.1117/12.878808. [PMID: 24236221 PMCID: PMC3824267 DOI: 10.1117/12.878808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The goal of this study was to characterize the image quality of our dedicated, quasi-monochromatic spectrum, cone beam breast imaging system under scatter corrected and non-scatter corrected conditions for a variety of breast compositions. CT projections were acquired of a breast phantom containing two concentric sets of acrylic spheres that varied in size (1-8mm) based on their polar position. The breast phantom was filled with 3 different concentrations of methanol and water, simulating a range of breast densities (0.79-1.0g/cc); acrylic yarn was sometimes included to simulate connective tissue of a breast. For each phantom condition, 2D scatter was measured for all projection angles. Scatter-corrected and uncorrected projections were then reconstructed with an iterative ordered subsets convex algorithm. Reconstructed image quality was characterized using SNR and contrast analysis, and followed by a human observer detection task for the spheres in the different concentric rings. Results show that scatter correction effectively reduces the cupping artifact and improves image contrast and SNR. Results from the observer study indicate that there was no statistical difference in the number or sizes of lesions observed in the scatter versus non-scatter corrected images for all densities. Nonetheless, applying scatter correction for differing breast conditions improves overall image quality.
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Affiliation(s)
- Jan H Pachon
- Department of Biomedical Engineering, Duke University, Durham, NC 27708 ; Department of Radiology, Duke University Medical Center, Durham, NC 27710 ; Medical Physics Graduate Program, Duke University Medical Center, Durham, NC 27705
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