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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 60 for “"Cone beam computed tomography (CBCT)"”.
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CONE BEAM COMPUTED TOMOGRAPHY (CBCT) DOSIMETRY: MEASUREMENTS AND MONTE CARLO SIMULATIONS
<p>Cone beam computed tomography (CBCT) is a 3D x-ray imaging technique in which the x-ray beam is transmitted to an object with wide beam geometry producing a 2D image per projection. Due to its faster image acquisition time, wide coverage length per scan, and fewer motion artifacts, the CBCT …
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Comparison of Cone-Beam Computed Tomography (CBCT), Fan-Beam Computed Tomography (FBCT), and Low-Field Magnetic Resonance Imaging (MRI) for Detection of Equine Fetlock Lesions
Computed tomography (CT) and magnetic resonance imaging (MRI) have been increasingly applied to diagnosing lameness localised to the fetlock region in standing horses. A full understanding of the benefits and limitations of CT and MRI for detection of bone and soft tissue lesions is essential for …
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Evaluating Dimensional Accuracy and Reliability of "Stitched" Small Field of View (SSFOV) Cone Beam Computed Tomography (CBCT) Datasets for Use in Proprietary Dental Implant Guided Surgery Software
… a "stitched" small field of view (SSFOV) cone beam computed tomography (CBCT) extraoral imaging system (Kodak 9000D, Carestream Health Inc, Kodak Dental Systems, Marne‑la‑Vallee, France) has been released. The benefits of the 3D stitching module of stitched SFOV CBCT may include: broader …
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X-ray Scatter Computation and Simulation in Cone Beam Computed Tomography
In cone beam computed tomography (CBCT) with a large subject volume within the x-ray field, the measured signal can be contaminated by a large amount of scattered photons due to x-ray interactions with the irradiated object. The photon scatter can severely degrade the quality of the reconstructed …
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Three-dimensional Surface Changes in the Mandible during Growth and Development
… Nine pairs of pre- and post-orthodontic cone-beam computed tomography (CBCT) scans were used to generate mandibular surfaces. Surfaces were superimposed on trabecular bone in the anterior mandible using a mutual information algorithm, and topographical changes were visualized and …
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Fascial Spaces and Communicating Apertures Found in the Neck. A Visual Learning Module of The Retropharyngeal Space
… the learning module. We collected a series of cone-beam computed tomography (CBCT) images following injection of radiopaque materials into the RPS. This will lay the foundation of this learning module for the RPS. With appropriate data, a more detailed perspective of fascial spaces could be …
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A CBCT Study of Pharyngeal Airway Changes Due to Fixed Functional Appliances
… of this retrospective study, using head and neck Cone-Beam Computed Tomography (CBCT) images, was to measure and compare volumetric, area, and linear changes of the pharyngeal airway space in patients treated with a MARA or Herbst Class II correction appliances. Materials and Methods: Twenty-six …
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Comparison between Ceph Analysis on Lateral Cephs, CBCT Scans, and MRI Scans
… measurements obtained from lateral cephs, cone beam computed tomography (CBCT) scans, and MR scans. Methods: Lateral cephs, CBCTs, and MRIs were taken on 22 patients. 3 separate readers traced the images and the data was analyzed using Bland-Altman plots. Results: The Bland-Altman plots …
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Spatial Resolution Analysis of a Variable Resolution X-ray Cone-beam Computed Tomography System
<p>A new cone-beam computed tomography (CBCT) system is designed and implemented that can adaptively provide high resolution CT images for objects of different sizes. The new system, called Variable Resolution X-ray Cone-beam CT (VRX-CBCT) uses a CsI-based amorphous silicon flat panel detector …
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Correlation of Tooth Length Measurements made on CBCT and 3T MR Images
… study compared tooth length measurements made on cone beam computed tomography (CBCT) scans and 3-Tesla (3T) magnetic resonance (MR) scans performed with and without an alginate bite registration surrounding the crowns of the teeth. Materials and Methods. One CBCT scan, one MR scan with alginate …
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Evaluation of Apical, Coronal and Occlusal Form Diffrences with Conventional Orthodontic Treatment
Introduction: Cone-beam computed tomography (CBCT) can be used to accurately identify dental landmarks in order to detect changes in dental arch forms. Purpose: The objective of this study was to determine how apical, coronal and occlusal arch forms change following orthodontic treatment with fixed …
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Assessment of Human Alveolar Bone Density by Using Volumetric CT Machine
… bone density in designated implants sites using cone-beam computed tomography (CBCT) and compared the measurements to those of quantitative computed tomography (QCT) and subjective bone density evaluation. Sixty-two designated implant sites in 9 human cadavers jaws were used. Indicator rods, 2 mm …
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Automated AI Classification of Midpalatal Suture Maturation Stages Using Deep Learning Framework
… of the midpalatal suture include evaluation of cone beam computed tomography (CBCT) imaging, which can provide valuable insights into the anatomy of the suture. However, diagnosis of midpalatal suture maturation remains a tedious task that has poor reproducibility among evaluators. Artificial …
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Effect of Mini-implant Diameters on Primary Stability and Viscoelastic Migration of Mini-implants under Orthodontic Loading
… density (BMD) were obtained using histogram of cone-beam computed tomography (CBCT) attenuation values surrounding the mini-implant hole. The cortical thickness along with the miniscrew hole was also measured using the CBCT image. Results The mini-implant diameters did not have an effect on …
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Peri-Radicular Healing Following Endodontic Microsurgery Grafted with Leukocyte and Platelet Rich Fibrin (L-PRF): One Year Evaluation with Cone Beam Computed Tomography
… (L-PRF) using 2D periapical radiographs and 3D cone-beam computed tomography (CBCT). Methods: Seventy patients (77 surgical sites) were enrolled, of whom 51 cases met the inclusion criteria for analysis and comparison with a historical clinical standard group. Healing outcomes were assessed at …
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Gender differences in mandibular bone mineral distribution with aging
… purposes of this study were to determine 1) if cone beam computed tomography (CBCT) can determine relative differences in bone mineral density distribution using clinical images of patients’ mandibular bone and 2) if the relative differences can be used to detect the effects of gender and age on …
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Accuracy of Unsegmented CBCT in Mesial-Distal Tooth Measurements
Introduction: Cone-beam computed tomography (CBCT) scans may be used to measure mesial-distal (MD) tooth width for orthodontic diagnosis and treatment planning. Purpose: The objective of this study was to determine if MD tooth measurements from unsegemented CBCT scans in the axial, sagittal, and …
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Multimedia Educational Resource of the Temporomandibular Joint for Dental Students
… studying the TMJ. The Planmeca Promax 3D Mid Cone Beam Computed Tomography (CBCT) was used to demonstrate coronal, sagittal and axial planes of TMJ structures. To view and capture CBCT images the InVivoDental Viewer 5.1 was used. Dry skull specimens, Netters Head and Neck Anatomy textbook …
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The study on treatment duration for traction of impacted maxillary canine by elastics derived from skeletal anchorage
… 견치 견인을 완료한 환자 27명의 치아 31개를 대상으로 연구를 시행하였다. 환자의 Cone-beam computed tomography (CBCT) 영상을 CT 분석 프로그램인 Simplant로 계측점, 계측선, 계측평면을 설정한 후 견치 높이, 절치 치축과의 각도, 소구치 치축과의 각도, 교합평면과의 각도, 이동 거리, 인접 절치와의 수평 관계, 인접 절치와의 수직 관계를 분석하였다. 그 후 다중 회귀 분석을 통해 매복 견치를 인접치의 절단연 혹은 교합면 높이까지 견인하는 동안 걸린 총 기간과 응급 내원을 포함한 내원 …
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Comparison of Bone- and Tooth-Anchored, Bone-Anchored, and Surgically Assisted Bone-Anchored Rapid Palatal Expansion: a Pilot Retrospective CBCT Study
… and Methods: Pre- (T1) and post-expansion (T2) Cone Beam Computed Tomography (CBCT) radiographs from 12 patients treated with BAME (median age = 15.5, 95% CI 14.0-18.1), 7 patients treated with BTAME (median age = 19, 95% CI 14.8-26.9), and 5 patients treated with SRBAME (median age = 38, 95% CI …
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