Cone-beam Computed Tomography (CBCT) is widely used in dental imaging, small animal imaging, radiotherapy, and non-destructive industrial inspection. The quality of CBCT images depends on the precise knowledge of the CBCT system's alignment. We introduce a distinct procedure, "precision alignment loop (PAL)", to calibrate any CBCT system with a circular trajectory. We describe the calibration procedure by using a line-beads phantom, and how PAL determines the misalignments from a CBCT system. PAL also yields the uncertainties in the simulated calibration to give an estimate of the errors in the misalignments. From the analytical simulations, PAL can precisely obtain the source-to-rotation axis distance (SRD), and the geometric center G, "the point in z-axis meets the detector", where the z-axis is coincident with the line from the X-ray source that intersects the axis of the rotation (AOR) orthogonally. The uncertainties of three misalignment angles of the detector are within ±0.05°, which is close to ±0.04° for the results of Yang et al. [18], but our method is easy and simple to implement. Our distinct procedure, on the other hand, yields the calibration of a micro-CT system and an example of reconstructed images, showing our calibration method for the CBCT system to be simple, precise, and accurate.
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http://dx.doi.org/10.1088/1361-6560/ad29b8 | DOI Listing |
Diagnostics (Basel)
December 2024
Department of Bio Health Convergency Open Sharing System, Dan-Kook University, Cheonan 31116, Republic of Korea.
This study aims to investigate the three-dimensional morphological differences of the sphenoid sinus according to sex in the Korean adult population and conduct an exploratory study based on the findings. The sphenoid sinus, located deep within the skull, plays a crucial role in forensic identification due to its relative protection from external damage and its unique anatomical characteristics. Using cone-beam computed tomography (CBCT) data from 120 patients (60 males and 60 females) aged 20-29, the sphenoid sinus was visualized and measured in three dimensions using Mimics software (version 22.
View Article and Find Full Text PDFDiagnostics (Basel)
December 2024
Department of Orthodontics, Faculty of Dental Medicine, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania.
The finite element method (FEM) is an advanced numerical technique that can be applied in orthodontics to study tooth movements, stresses, and deformations that occur during orthodontic treatment. It is also useful for simulating and visualizing the biomechanical behavior of teeth, tissues, and orthodontic appliances in various clinical scenarios. The objective of this research was to analyze the mechanical behavior of teeth, tissues, and orthodontic appliances in various clinical scenarios.
View Article and Find Full Text PDFCureus
December 2024
Radiation Oncology, Washington University School of Medicine, Saint Louis, USA.
CT-guided adaptive radiotherapy (ART) for the treatment of pancreatic adenocarcinoma is rapidly increasing and has been shown to provide advanced treatment tools comparable to magnetic resonance imaging (MRI)-guided adaptive therapy. Here, we provide the first case report of a local pancreatic recurrence treatment after definitive resection using cone beam computed tomography (CBCT)-guided ART (CT-guided ART) enabled by HyperSight imaging (Varian Medical Systems, Inc., Palo Alto, CA, USA) for daily delineation of organs-at-risk (OARs) and target to improve the quality of online ART.
View Article and Find Full Text PDFRestor Dent Endod
January 2025
Research Department COC-CICO, Institución Universitaria Colegios de Colombia (UNICOC), Bogotá, Colombia.
Pulp chamber and root canal obliteration (PCO/RCO) presents a challenge for clinicians when nonsurgical endodontic treatment is indicated. Guided endodontics (GE) aims to precisely locate the root canal (RC) system while preserving as much pericervical dentin as possible. GE involves integrating cone-beam computed tomography (CBCT) of the affected tooth with a digital impression of the maxillary/mandibular arch, allowing for careful planning of the drilling path to the RC system through a three-dimensional (3D) static guide.
View Article and Find Full Text PDFJ Stomatol Oral Maxillofac Surg
January 2025
Center for Oral and Maxillofacial Surgery, Faculty of Medicine/Dental Medicine, Danube Private University, Krems, Austria. Electronic address:
Precise volumetric measurement of newly formed bone after maxillary sinus floor augmentation (MSFA) can help clinicians in planning for dental implants. This study aimed to introduce a novel modular framework to facilitate volumetric calculations based on manually drawn segmentations of user-defined areas of interest on cone-beam computed tomography (CBCT) images MATERIAL & METHODS: Two interconnected networks for manual segmentation of a defined volume of interest and dental implant volume calculation, respectively, were used in parallel. The volume data of dental implant manufacturers were used for reference.
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