Purpose: Compressed sensing (CS)-based iterative reconstruction (IR) techniques are able to reconstruct cone-beam CT (CBCT) images from undersampled noisy data, allowing for imaging dose reduction. However, there are a few practical concerns preventing the clinical implementation of these techniques. On the image quality side, data truncation along the superior-inferior direction under the cone-beam geometry produces severe cone artifacts in the reconstructed images. Ring artifacts are also seen in the half-fan scan mode. On the reconstruction efficiency side, the long computation time hinders clinical use in image-guided radiation therapy (IGRT). Methods: Image quality improvement methods are proposed to mitigate the cone and ring image artifacts in IR. The basic idea is to use weighting factors in the IR data fidelity term to improve projection data consistency with the reconstructed volume. In order to improve the computational efficiency, a multiple graphics processing units (GPUs)-based ...
Purpose: Due to the limited number of projections at each phase, the image quality of a four-dimensional cone-beam CT (4D-CBCT) is often degraded, which decreases the accuracy of subsequent motion modeling. One of the promising methods is the simultaneous motion estimation and image reconstruction (SMEIR) approach. The objective of this work is to enhance the computational speed of the SMEIR algorithm using adaptive feature-based tetrahedral meshing and GPU-based parallelization. Methods: The first step is to generate the tetrahedral mesh based on the features of a reference phase 4D-CBCT, so that the deformation can be well captured and accurately diffused from the mesh vertices to voxels of the image volume. After the mesh generation, the updated motion model and other phases of 4D-CBCT can be obtained by matching the 4D-CBCT projection images at each phase with the corresponding forward projections of the deformed reference phase of 4D-CBCT. The entire process of this 4D-CBCT reconstruction ...
DOI: 10.11607/jomi.3524 Purpose: To evaluate the influence of the milliamperage settings on cone beam computed tomography (CBCT) images for qualitative and quantitative preoperative implant planning. Materials and Methods: Eight dry mandibles were scanned under different milliamperage values (2, 4, 6.3, 8, 10, 12, and 15 mA) available for selection on the Kodak 9000 CBCT unit. Cross-sectional slices of incisor, canine, premolar, first molar, and second molar regions were analyzed by three oral radiologists. A subjective image quality evaluation of the anatomical structures and an objective evaluation using bone height measurements compared with the real measurements obtained in the mandible were performed. After 30 days, 25% of the sample was reevaluated to obtain the reproducibility of the results. Results: The weighted-kappa coefficient and intraclass correlation coefficient for intra- and interobserver agreement varied between moderate and substantial agreement for the image quality ...
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We investigate lesion detectability and its trends for different noise structures in single-slice and multislice CBCT images with anatomical background noise. Anatomical background noise is modeled using a power law spectrum of breast anatomy. Spherical signal with a 2 mm diameter is used for modeling a lesion. CT projection data are acquired by the forward projection and reconstructed by the Feldkamp-Davis-Kress algorithm. To generate different noise structures, two types of reconstruction filters (Hanning and Ram-Lak weighted ramp filters) are used in the reconstruction, and the transverse and longitudinal planes of reconstructed volume are used for detectability evaluation. To evaluate single-slice images, the central slice, which contains the maximum signal energy, is used. To evaluate multislice images, central nine slices are used. Detectability is evaluated using human and model observer studies. For model observer, channelized Hotelling observer (CHO) with dense difference-of-Gaussian ...
Conebeam CT (CBCT) is an imaging technique that employs a divergent x-ray source and usually a large-area flat-panel detector to form a cone-shaped exposure to the imaged object. Such a configuration guarantees the volume coverage of one large object and achieves the volumetric imaging within one single scan. The first CBCT scanner entered the market in 1996 as the dental scanner by NewTom Corp. Subsequently, CBCT was extended to multiple clinical applications, including implantology, orthopedics, interventional radiology, and radiation oncology.
Differences between IG using 4D-CBCT as gold standard and the two IG techniques using 3D-CBCT were 3.6 mm (IG-3D) and 1.9 mm (IG-ITV) on average. These uncertainties of 3D CBCT IG appear especially large when compared to the average base-line shift of 4.9 mm in our study, the reason for performing soft-tissue IG. Korreman et al. estimated the residual uncertainty of the IG procedure to 20 % of the initial motion [5], which is optimistic based on our results. Differences in the tumor position between 4D-CBCT and 3D-CBCT based IG increased with increasing motion magnitude of the pulmonary targets and increased with worse image quality scores of 3D-CBCT. These results clearly indicate that 3D-CBCT is not fully sufficient for full motion integration into IG.. This finding of improved accuracy using 4D-CBCT compared to 3D-CBCT is in contrast to the study by Hugo et al. [7], which could be explained by two reasons. First, our study is based on a larger number of patients and poor image quality of the ...
C-arm cone-beam computed tomography (CT)-guided transthoracic lung core needle biopsy (CNB) is a safe and accurate procedure for the evaluation of patients with pulmonary nodules. This article will focus on the clinical features related to CNB in terms of diagnostic performance and complication rate. Moreover, the concept of categorizing pathological diagnosis into 4 categories, which could be used for clinical management, follow-up, and quality assurance is also introduced. We retrospectively collected data regarding 375 C-arm cone-beam CT-guided CNBs from January 2010 and June 2014. Clinical and radiological variables were evaluated in terms of success or failure rate. Pathological reports were inserted in 4 homogenous groups (nondiagnostic--L1, benign--L2, malignant not otherwise specified--L3, and malignant with specific histotype--L4), defining for each category a hierarchy of suggested actions. The sensitivity, specificity, and positive and negative predictive value and accuracy for ...
C-arm cone-beam computed tomography (CT)-guided transthoracic lung core needle biopsy (CNB) is a safe and accurate procedure for the evaluation of patients with pulmonary nodules. This article will focus on the clinical features related to CNB in terms of diagnostic performance and complication rate. Moreover, the concept of categorizing pathological diagnosis into 4 categories, which could be used for clinical management, follow-up, and quality assurance is also introduced. We retrospectively collected data regarding 375 C-arm cone-beam CT-guided CNBs from January 2010 and June 2014. Clinical and radiological variables were evaluated in terms of success or failure rate. Pathological reports were inserted in 4 homogenous groups (nondiagnostic--L1, benign--L2, malignant not otherwise specified--L3, and malignant with specific histotype--L4), defining for each category a hierarchy of suggested actions. The sensitivity, specificity, and positive and negative predictive value and accuracy for ...
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The purpose of this study was to assess the structural characteristics of styloid process (SP) by cone-beam computed tomography (CBCT) examination in a patient population suffering from orofacial pain. The second aim was to assess the prevalence of elongated SP and its relation to gender, site and subjective symptoms in the study population. Clinical and radiographic records of 208 patients were evaluated retrospectively. Radiological examinations including measurements of the structure, length, and medial angulations of SP were performed on CBCT images. Out of 208 patients, 96 (46%) had not-elongated SP, 28 (13%) had left side, 16 (8%) had right side, and 68 (33%) had bilateral elongation of SP. The patients with elongated SP had significantly decreased angle values. There were no statistically significant differences in length values of SP between males and females in both groups. Significantly increased prevalence of symptoms except headache was observed in patients with elongated SP. This study
According to a new report published by Allied Market Research, titled, CBCT Systems Market: Global Opportunity Analysis and Industry Forecast, 2017-2023, the global CBCT systems market was valued at $536 million in 2016, and is projected to reach $1,041 million by 2023, growing at a CAGR of 9.9% from 2017 to 2023. Dental application segment held more than four-fifths share of the total market in 2016.. Cone beam computed tomography (CBCT) systems are a special type of x-ray equipment. These systems are used by medical professionals to reconstruct a 3D image of various regions of patients anatomy such as dental, oral and maxillofacial region, and ears, nose and throat.. Request for Summary of Report at https://www.alliedmarketresearch.com/request-free-sample/2274. Rise in geriatric population, wide range of applications of CBCT systems in dental practice and upsurge in number of patients suffering from dental diseases are expected to drive the market growth. Moreover, expanding application of ...
Dr. Mark Taff & Dr. Brad Levine specializes in using the Cone Beam, CT Scan and 3-D Imaging for advanced views below the surface. Schedule your appointment today to see Dr. Mark Taff & Dr. Brad Levine and get a closer look at your oral health.
Obtaining high-resolution CT scans for clinical applications is challenging, However, it could help better understand and treat such bone diseases as osteoporosis. High-resolution peripheral computed tomography (HR-pQCT) is considered the best technique in vivo. However, a breakthrough for clinical practice is lacking due to a relatively long acquisition time, which inhibits scanning of large field of view (FOV) in vivo. A promising alternative is the high-resolution cone-beam computed tomography (CBCT), which is already the gold standard in many dental and maxillofacial applications. The top high-resolution CBCT scanners on the market (eg., Newtom 5G) feature a fast scanning time (18 à 31s), a large FOV (12x12x8cm3) and a low radiation dosage, in addition to a high resolution (voxel size down to 75µm). Yet, CBCT is impaired by the presence of image artefacts that reduce image contrast, leading to it being currently used for qualitative evaluation only ...
For most offline calibration methods, a specific phantom scanning is often required before the following imaging tasks. Its time-consuming and unable to be applied to the unstable systems. Some online approaches dont have such drawbacks but their accuracy cannot fulfil requirements compared with the offline ones. This paper proposes an Epipolar geometry consistency based online geometric calibration for cone beam CT(CBCT). Four parameters: the detector skew, rotation axis, mid-plane and the source to detector distance are employed for geometrical modeling of CBCT in this paper. A cost function is built by exploiting the Epipolar geometry consistency among the projective views. By taking advantage of the simplex-simulated annealing algorithm(SIMPSA) algorithm to minimize the cost function, we can obtain the geometric parameters of our practical CBCT systems for image reconstruction. In simulation, different noise levels are added to projection images respectively and the experimental results ...
CBCT Systems Market was worth $536 million in 2016, and is estimated to reach $1,041 million by 2023, growing at a CAGR of 9.9% during the study period.
REFERENCES. 1. Farman AG, Scarfe WC. Development of imaging selection criteria and procedures should precede cephalometric assessment with cone-beam computed tomography. Am J Orthod Dentofacial Orthop. 2006;130(2):257-65. [ Links ] 2. Schulze D, Heiland M, Thurmann H, Adam G. Radiation exposure during midfacial imaging using 4- and 16-slice computed tomography, cone-beam computed tomography systems and conventional radiography. Dentomaxillofac Radiol. 2004;33(2):83-6. [ Links ] 3. Silva MA, Wolf U, Heinicke F, Bumann A, Visser H, Hirsch E. Cone-beam computed tomography for routine orthodontic treatment planning: a radiation dose evaluation. Am J Orthod Dentofacial Orthop. 2008;133(5):640.e1-5. [ Links ] 4. Tsiklakis K, Donta C, Gavala S, Karayianni K, Kamenopoulou V, Hourdakis CJ. Dose reduction in maxillofacial imaging using low dose Cone-beam CT. Eur J Radiol. 2005;56(3):413-7. [ Links ] 5. Scarfe W, Farman A. What is cone-beam CT and how does it work? Dent Clin North Am. 2008;52(4):707-30. [ ...
Exact Interior Reconstruction with Cone-Beam CT. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
We present a detailed derivation of the phase-retrieval formula based on the phase-attenuation duality that we recently proposed in previous brief communication. We have incorporated the effects of x-ray source coherence and detector resolution into the phase-retrieval formula as well. Since only a single image is needed for performing the phase retrieval by means of this new approach, we point out the great advantages of this new approach for implementation of phase tomography. We combine our phase-retrieval formula with the Feldkamp-Davis-Kresss (FDK) cone-beam reconstruction algorithm to provide a three-dimensional phase tomography formula for soft tissue objects of relatively small sizes, such as small animals or human breast. For large objects we briefly show how to apply Katsevichs cone-beam reconstruction formula to the helical phase tomography as well.. ©2005 Optical Society of America. Full Article , PDF Article ...
Dr. Brian P. Trava of New Jersey Root Canal discusses the most important investment in his practice, his Planmeca ProMax 3D. From providing more clinical data in images, to seamless 3rd party integration and a lower dosage of radiation to patients, ProMax 3D has helped Dr. Travas practice grow.. Watch the video and learn three reasons why Trava recommends ProMax 3D. The ProMax 3D, by far, gives you the best detail out of any machine on the market. Learn more about Dr. Travas practice at www.njrootcanal.com ...
Patient is aware of fee payable on the day to Taverham Dental Health Clinic- £75 OPG/ £250 CBCT scan. Our files will be exported as a DICOM file and bundled with the Sirona viewer, which can be sent electronically, posted on a USB or simply collected by your patient. Taverham Dental Health Clinic does not routinely report on CBCT scans. To comply with the IR(ME)R 2000 regulations all CBCT scans are required to be reviewed and reported in the clinical notes by the referring practitioner or by a radiologist. The operator at Taverham Dental Health Clinic will take a scan with the lowest dose, smallest field of view, and the best resolution according to the area of interest and clinical indications, in line with IR(ME)R and ALARP. The age, anatomy and physical build of the patient are all dependant factors ...
Dental cone beam CT emits less radiation and provides a more complete picture than CT and CAT scans. Hospital CTs work by taking a series of parallel X-ray images of the head, from top to bottom. That leaves gaps between each image, which have to be filled by the computers educated guesses, and that many X-rays come with a lot of radiation.. A cone beam CT circles the head, which overlaps each image or slice, leaving no gaps. The radiation is also much weaker. The most radiation hits the the area of interest, which is where the images overlap to construct the 3D model. This is how CBCT is able to provide a more complete image with less radiation exposure. ...
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diagnostic imaging method in which a computer is used to generate a three-dimensional image of the internal of an object using a series of two-dimensional X-ray image slices taken around a single axis of rotation. Cone Beam refers to the type of X-Ray projection and is important because it allows users to image a small well defined volume such as the lower face and mouth at low radiation dosage. Thats the definition, but what does it mean in the real world of dental diagnostics? One of the most important concepts to understand with Cone Beam CT is that the user is imaging a volume (like a model), not just a single plane (like a photo). However in actual use it is even better. That is because the user can not only view the model from any angle but the user can view inside the model as if the jaws and teeth were sliced with a band saw to expose a cross section. These band saw slices can be made at any angle, at any depth and can be viewed as a series of slices as if the user was slowly passing ...
For the past decade, some dental offices have changed their view of radiography, literally. Cone Beam Computerized Tomography (CBCT) scanners presented the opportunity to obtain a 3-dimensional view of the mouth, that improved diagnosis, facilitated treatment planning and enhanced opportunities for patient education. Before in-office CBCTs became available, many patients who needed 3-D scans were referred out to hospital or imaging centers to obtain medical CTs. This was not only inconvenient and time consuming, but also exposed dental patients to more radiation than was necessary for dental treatment. Recently, articles have appeared cautioning the public about the increased health risks from medical CT scans. While it is worthwhile to take precautions to avoid exposure to unnecessary radiation, it is also important to avoid confusing radiation exposure statistics of medical CTs with those of dental CBCT scans.. ...
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There is a growing interest in minimally invasive implant therapy as a standard prosthodontic treatment, providing complete restoration of occlusal function. A new treatment method (CADDIMA), which combines both computerized tomographic (CT) and optical laser-scan data for planning and design of surgical guides, implant abutments, and prosthetic devices, is described. Imaging using a NewTom 3G cone beam CT scanner and a modified laser triangulation scanner D200c is discussed, as are impression and surgical guide fabrication, which allow for flapless, precise implant placement and an accurate provisional prosthesis. The new approach gives the operator full control over the design of the implant prosthesis for planning of proper occlusal relations and shows promise for further evaluation ...
This study evaluated the potential impact of different visualisation methods of cone-beam computed tomography (CBCT) on the accuracy of linear measurements of calcified structures, and assessed their interchangeability. High resolution (0.125 mm voxel) CBCT scans were obtained from eight cadaveric heads. The distance between the alveolar bone ridge and the incisal edge was determined for all mandibular incisors and canines, both anatomically and with measurements based on the following five CBCT visualisation methods: isosurface, direct volume rendering, multiplanar reformatting (MPR), maximum intensity projection of the volume of interest (VOIMIP), and average intensity projection of the volume of interest (VOIAvIP). All radiological methods were tested for repeatability and compared with anatomical results for accuracy, and limits of agreement were established. Interchangeability was evaluated by reviewing disparities between the methods and disclosing deterministic differences. Fine intra- ...
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Scattered photons highly degrade the quality of X-ray images and their effect has become more important due to the increasing interest in cone-beam geometry for the acquisition of CT (CBCT) and micro-CT data. The random nature of scatter events and the great i Scattered photons highly degrade the quality of X-ray images and their effect has become more important due to the increasing interest in cone-beam geometry for the acquisition of CT (CBCT) and micro-CT data. The random nature of scatter events and the great influence of the sample suggest that the most accurate methods for their estimation are Monte Carlo (MC) techniques, but their use is usually hampered by the large computation time required to obtain an acceptable estimation of the scattered radiation. We present an approach for scatter correction in CBCT by MC estimation, speeding up the computation by means of general purpose graphic processing units (GPGPU) and developing a framework for the automatic correction and reconstruction ...
Objective: To determine the accuracy of volumetric analysis of teeth in vivo using cone-beam computed tomography (CBCT). Materials and Methods: The physical volume (Vw) of 24 bicuspids extracted for orthodontic purposes (16 were imaged with the I-CAT and 8 with the CB MercuRay) were determined using the water displacement technique. Corresponding pretreatment CBCT image data were uploaded into Amira 4.0 for segmentation and radiographic volume (Va). All measurements were performed twice by two observers. The statistical difference between Vw and Va was assessed using a paired Hest. The intraobserver and interobserver reliability were determined by calculating Pearson correlation coefficients and intraclass correlation coefficients. Results: The overall mean Vw of teeth specimens was 0.553 +/- 0.082 cm(3), while the overall mean Va was 0.548 +/- 0.079 cm(3) (0.529 +/- 0.078 cm(3) for observer 1 and 0.567 +/- 0.085 cm(3) for observer 2). There were statistically significant differences between Va ...
Dr. Mone uses advanced dental technology including the Cone Beam CT Scan for a more precise placement of dental implants in Braintree, MA. Call to learn more!
PRIMARY OBJECTIVES:. I. Establish the technical feasibility of MRI for performing functional soft-tissue targeting of radiotherapy in the pelvis and thorax. (Group I) II. Acquire clinical MR imaging data to evaluate image quality tradeoffs and operational parameter settings. (Group I) III. Validate the selection of MRI technique factors by comparing visibility of soft tissue structures in MRIs, cone beam (CB)CTs and fan beam (FB)CTs of the same patient. (Group II) IV. Assess the feasibility of using deformable image registration to map contours from FBCT to MRI, CBCT to MRI, MRI to MRI and vice versa. (Group II) V. Compare morphologic and functional changes in target and normal structures, visualized on MRI, CBCT and FBCT images, in response to radiation therapy and identify opportunities for treatment adaptation. (Group II). OUTLINE:. Patients undergo MRI and FBCT at baseline, within the first 3 weeks of radiotherapy and between week 4 and 6 of radiotherapy. Patients with lung cancer may ...
Planmed, based in Helsinki, Finland, is releasing an upgraded new version of its popular Planmed Verity CBCT (Cone Beam Computed Tomography) extremity
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This clinical trial studies magnetic resonance imaging (MRI), cone beam computed tomography (CT), and fan beam CT in detecting soft tissue in patients w
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Cone-beam (CB) computed tomography (CT) is widely used in the field of medical imaging for guidance. Inspired by Betrams directional interpolation (BDI) methods, directional sinogram interpolation (DSI) was implemented to generate more CB projection
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A cone beam CT scan involves a special type of x-ray that allows us to see the details of your oral and facial health. This scan is more than just a typical x-ray, since it allows us to identify nerve pathways, soft tissue and bone before providing you with treatment. This gives us a clear view of your oral health so that treatment is easier and more effective for you. The scan takes just seconds in our office and provides us with a highly detailed image ...
The report EMEA 3D CBCT/Cone Beam CT Systems Market by Application (Dental (Oral and Maxillofacial Surgery, Implantology, Orthodontic, Endodontic) and Non-Dental (Radiology, ENT)), End User (Hospitals and [read full press release…]. ...
Planmeca PlanScan is a powder-free system that utilizes blue-laser technology to capture high-quality data for more precise prosthetics. This plug-and-play technology gives users the freedom to simultaneously scan and collaborate at multiple workstations. ...
CBCT in dentistry recommended uses and comparisons of the different CBCT units available. CBCT research comparing different machines.
What is Dental Cone Beam CT?. Dental cone beam computed tomography (CT) is a special type of x-ray machine used in situations where regular dental or facial x-rays are not sufficient. It is not used routinely because the radiation exposure from this scanner is significantly more than regular dental x-rays. This type of CT scanner uses a special type of technology to generate three dimensional (3-D) images of dental structures, soft tissues, nerve paths and bone in the craniofacial region in a single scan. Images obtained with cone beam CT allow for more precise treatment planning.. Metal objects, including jewelry, eyeglasses, dentures and hairpins, may affect the CT images and should be left at home or removed prior to your exam. You may also be asked to remove hearing aids and removable dental work. You may be asked to remove any piercings, if possible. Cone beam CT is not the same as conventional CT. However, dental cone beam CT can be used to produce images that are similar to those produced ...
X-ray computed tomography (CT) is instrumental in medicine, industry and homeland security, which depicts internal structures of an object from its shadows projected in a fan-beam or cone-beam from an x-ray source along a appropriate trajectory. We published the first paper on spiral conebeam CT in 1991 to solve the long object problem. Now, spiral conebeam scanning has been widely used in modern CT scanners, in which conebeam rotation and table translation are simultaneously performed, and spiral cone-beam CT remains a major area in CT research and development ...
This report (HPA-RPD-065) provides guidance on 2 important areas of radiation protection related to dental cone beam CT equipment.
Recently, several computed tomography (CT) machines with multirow detectors have been introduced on the market. Although the projections are obtained from a cone beam rather than a fan beam, multislice reconstruction algorithms in contemporary machines are firmly rooted in two-dimensional (2D) reconstruction of planar objects. Short-scan algorithms are dominating and these are preferably classified according to how redundant data are handled, using parallel rebinning, complementary rebinning, or Parker weighting. In the long run, truly 3D cone-beam algorithms are likely to take over, however. It has proved to be quite a challenge to design an algorithm that is both practical and exact under the constraints set by helical source path geometry. All attempts in this direction are readily seen to be derivatives of Grangeats algorithm. Alternative research efforts have been building on the nonexact algorithm by Feldkamp et al. (J Opt Soc Am 1: 612-619, 1984). These algorithms strive for simplicity ...
In recent years the development of cone-beam reconstruction algorithms has been an active research area in x-ray computed tomography (CT), and significant progress has been made in the advancement of algorithms. Theoretically exact and computationally efficient analytical algorithms can be found in the literature. However, in single photon emission computed tomography (SPECT), published cone-beam reconstruction algorithms are either approximate or involve iterative methods. The SPECT reconstruction problem is more complicated due to degradations in the imaging detection process, one of which is the effect of attenuation of gamma ray photons. Attenuation should be compensated for to obtain quantitative results. In this paper, an analytical reconstruction algorithm for uniformly attenuated cone-beam projection data is presented for SPECT imaging. The algorithm adopts the DBH method, a procedure consisting of differentiation and backprojection followed by a finite inverse cosh-weighted Hilbert transform.
Methods: Different kV-CBCT acquisition modes with different tube voltage (kV) and exposure (mAs) were studied: pelvis and pelvis obese with a Varian Truebeam™ (unit 1), pelvis and low dose thorax with a Varian Clinac 2100CD (unit 2). Using the TomoTherapy® Cheese phantom (Gammex RMI, Middleton, WI) for HU to electron density (de) calibration curve, and the NEMA body water phantom for HU uniformity, noise and mean water number analysis, were investigated. From the FBCT and kV-CBCT HU differential histograms, frequency peaks representing water, air, lung, soft tissue and bone were compared. Results: For unit 2, streaking and ring artifacts are much greater than for unit 1 as well as HU uniformity is deteriorated. Noise values are comparable between units but standard deviation is twice at unit 2. Peaks observed in the differential histograms are broader in kV-CBCT than those of FBCT especially for high tissue density. kV-CBCT uniformity is more degraded than in FBCT because CBCT is more ...
This report (HPA-CRCE-010) outlines measures for protection from radiation doses from dental cone beam computed tomography (CBCT) examinations.
Materials and methods Cone beam CT (CBCT) was performed using a flat panel detector angiography system. Datasets were reconstructed from 620 projection images acquired over a 200° arc (rotation time 20.7 s) at 80 kVp and a total of 260 mAs. To maximize spatial resolution, projection images were obtained using a small detector format (22 cm) and reconstructions were performed without pixel binning.. A contrast injection protocol was optimized in a porcine model for balance between stent visualization host vessel opacification. Three different intracranial stents were deployed in the internal maxillary arteries of two Yorkshire swine. Selective CBCT angiography was performed at contrast concentrations between 10 and 30% (Iopamidol 51%, by volume in normal saline) and flow rates between 0.5 and 3.5 ml/s. The CBCT datasets were reviewed and the optimal combination of parameters was used for clinical testing.. The clinical study was approved by our institutional review board. 57 CBCT examinations of ...
The BEC model was developed by the AAP to address emerging clinical topics in periodontology for which there is insufficient evidence to arrive at definitive conclusions. Using current high-quality published literature and the expert opinion of periodontal thought leaders, the BEC model aims to provide clinicians with reasonable applications of newer technologies, such as CBCT.. As new technologies emerge, it often takes many years for sufficient high-quality evidence to allow clinicians to appropriately incorporate the technology into patient care, said Kenneth Kornman, DDS, PhD, editor of the Journal of Periodontology. The BEC reports are designed to bridge the gaps and provide evidence summaries and expert interpretations that guide clinical use now. We anticipate that the BEC reports will help us apply new technologies in a focused manner to help improve the health of our patients.. Introduced just over 20 years ago, CBCT technology provides a beneficial tool for periodontists to use in ...
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A new method to reduce artifacts (MAR), produced by high-density objects, especially metal implants (MI), in X-ray CBCT is presented. MIs located in the field of view (FOV) result in artifacts influencing clinical diagnostics and treatments. The novel method reduces metal artifacts by virtually replacing MIs by tissue objects of the same shape. This corrected data can be reconstructed with significantly reduced artifacts. After reconstruction, the segmented 3D MIs were re-inserted into the corrected 3D volume. The method was developed for mobile C-arm CBCTs, where misalignments between original 2D data and forward projections must be adjusted before correction ...
Cone Beam CT of the Head and Neck An Anatomical Atlas PDF Download | Chung How Kau, Kenneth Abramovitch, Sherif Galal Kamel, Marko Bozic Cone Beam CT of the Head and Neck presents normal anatomy of the head using photographs of cadavers
WaterMed provides quality and cheap dental x-ray machine. All CBCT machine enjoys excellent technical support. The portable dental x-ray machine is hot-selling for its features, while The dental x-ray unit is well-known for its cost performance.
Materials and methods: Two registration methods based on optical flow estimation have been programmed to run on a graphics programming unit (GPU). One of these methods by Horn & Schunck is tested on a 4DCT thorax data set with 10 phases and 41 landmarks identified per phase. The other method by Cornelius & Kanade is tested on a series of six 3D cone beam CT (CBCT) data sets and a conventional planning CT data set from a head and neck cancer patient. In each of these data sets 6 landmark points have been identified on the cervical vertebrae and the base of skull. Both CBCT to CBCT and CBCT to CT registration is performed. Results: For the 4DCT registration average landmark error was reduced by deformable registration from 3.5 ± 2.0 mm to 1.1 ± 0.6 mm. For CBCT to CBCT registration the average bone landmark error was 1.8 ± 1.0 mm after rigid registration and 1.6 ± 0.8 mm after deformable registration. For CBCT to CT registration errors were 2.2 ± 0.6 mm and 1.8 ± 0.6 mm for rigid and deformable
Due to low radiation dose, cone-beam computed tomography is growing in importance. In image reconstruction, a stack of cross-sectional images can be recons
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Planmeca MAKES STRATEGIC INVESTMENT IN E4D TECHNOLOGIES. Helsinki, Finland, December 23, 2013 - Planmeca, the worlds largest privately owned dental imaging company and equipment manufacturer, announced today that it has made a non-controlling, strategic investment in E4D Technologies, LLC, developer of the E4D CAD/CAM Restorative System. This strategic investment reinforces Planmecas on-going commitment to help dental providers improve patient care by offering a comprehensive portfolio of integrated digital dental solutions for dentists and dental laboratories.. Planmeca will co-develop CAD/CAM products with E4D Technologies and offer these products in North America under the brand names Planmeca PlanScan-E4D Technologies and PlanMill-E4D Technologies. Henry Schein, Inc. will continue to be the exclusive distributor in the U.S., Canada, Australia, and New Zealand. In addition, Planmeca will expand distribution of the E4D system to more than 120 additional international markets under the ...
In point-based rigid-body registration, target registration error (TRE) is an important measure of the accuracy of the performed registration. The registrations accuracy depends on the fiducial localization error (FLE) which, in turn, is due to the
Compressive Sensing (CS) theory has great potential for reconstructing Computed Tomography (CT) images from sparse-views projection data and Total Variation- (TV-) based CT reconstruction method is very popular. However, it does not directly incorporate prior images into the reconstruction. To improve the quality of reconstructed images, this paper proposed an improved TV minimization method using prior images and Split-Bregman method in CT reconstruction, which uses prior images to obtain valuable previous information and promote the subsequent imaging process. The images obtained asynchronously were registered via Locally Linear Embedding (LLE). To validate the method, two studies were performed. Numerical simulation using an abdomen phantom has been used to demonstrate that the proposed method enables accurate reconstruction of image objects under sparse projection data. A real dataset was used to further validate the method.
The gentle spirit of Michiko Mary Morita, beloved wife, mother, and grandmother, passed from this earth on July 16, 1998. She was born on March 4, 1914 in Kumamoto, Japan, to Saburo Ogata and Tsumo Kazoye. She attended school in Los Angeles, California. On October 10, 1936 she married her high school sweetheart, Mino Minori Morita. They moved to Salt Lake City, Utah in 1941 and have resided here ever since. She was a professional seamstress for 60 years.
INTRODUCTION: The purpose of this study was to propose a protocol for safe bicortical placement of mini-implants by measuring the interradicular spaces of the maxillary teeth and the bone quality.. METHODS: Cone-beam computed tomography data were obtained from 50 adults. Three-dimensional reconstructions and measurements were made with SimplantPro software (Materialise, Leuven, Belgium). For each interradicular site, the bone thicknesses and interradicular distances at the planes 1.5, 3, 6, and 9 mm above the cementoenamel junction were measured. Standard bone units were defined to evaluate the influences of bone density and the different placement patterns on the stability of the mini-implants.. RESULTS: The safe interradicular sites in the maxilla for bicortical placement of 1.5-mm-diameter mini-implants were in all planes between the first and second premolars, and between the second premolar and the first molar. The safe palatal sites were between the first and second molars, and the safe ...
PLX3000A Panoramic Imaging Digital CBCT Dental system Usage of PLX3000A dental CBCT system with 3D imaging system PLX3000A is widely used for dental CT diagnostic with 12cm*15cm flat panel detector, mainly for oral and maxillofacial surgeries,...
To provide a comprehensive assessment of patient setup accuracy in 6 degrees of freedom (DOFs) using 2-dimensional/3-dimensional (2D/3D) image registration with on-board 2-dimensional kilovoltage (OB-2DkV) radiographic images we evaluated cranial head and neck KN-93 (HN) and thoracic and abdominal sites KN-93 under clinical conditions. axis. The windows/level adjustments for optimal visualization of the bone in OB-2DkV and DRRs were performed prior to registration. Ideal patient alignment at the isocenter was calculated and used as an initial registration position. In 3D/3D registration cone-beam CT (CBCT) was aligned to simCT on bony structures using a bone density filter in 6DOF. Included in this retrospective study were 37 patients treated in 55 fractions with frameless stereotactic radiosurgery or stereotactic body radiotherapy for cranial and paraspinal cancer. A cranial phantom was used to serve as a control. In all cases CBCT images were acquired for patient setup with subsequent OB-2DkV ...
Quantitative three-dimensional assessment of buccal alveolar bone thickness with dental cone-beam computed tomography, Salmeh Kalbassi, Foong Weng Chiong, Hwang Yee Cheau, Wong Hun
was created late 2016 to investigate the potential of the technology, to test and validate research hypotheses and to promote the use of validated measurement methods. The CBCT scanner is mounted on a C-arm in the IR suite, which offers real time imaging with a stationary patient. This eliminates the time needed to transfer a patient from the angiography suite to a conventional computed tomography scanner and facilitates a broad spectrum of applications of CBCT during IR procedures. The clinical applications of CBCT in IR include treatment planning, device or implant positioning and assessment, intra-procedural localization, and assessment of procedure endpoints. CBCT is useful as a primary and supplemental form of imaging. It is an excellent adjunct to DSA and fluoroscopy for soft tissue and vascular visibility during complex procedures. The use of CBCT before fluoroscopy potentially reduces patient radiation exposure. Chemoembolization for Hepatocellular Carcinoma: CBCT with contrast confirms ...
PubMed journal article A Cone-Beam Computed Tomographic Study on Mandibular First Molars in a Chinese Subpopulatio were found in PRIME PubMed. Download Prime PubMed App to iPhone or iPad.
In this work several algorithms for diaphragm detection in 2D views of cone-beam computed tomography (CBCT) raw data are developed. These algorithms are tested on 21 Siemens megavoltage CBCT scans of lungs and the result is compared against the diaphragm apex identified by human experts. Among these algorithms dynamic Hough transform is sufficiently quick and accurate for motion determination prior to radiation therapy. The diaphragm was successfully detected in all 21 data sets, even for views with poor image quality and confounding objects. Each CBCT scan analysis (200 frames) took about 38 seconds on a 2.66 GHz Intel quad-core 2 CPU. The average cranio-caudal position error was 1.707 ± 1.117 mm. Other directions were not assessed due to uncertainties in expert identification.
Villa Verde hospital invests in technology and expertise in order to enhance their services to citizens and professionals.. Finally, also in Reggio Emilia it is possible to perform a 1.5 Tesla MRI using the latest fully digitized equipment. This equipment features innovative technology, tunnels wider and shorter than the previous generation of instruments and is considerably less noisy.. This type of non-invasive instrument can display with extreme precision the nervous system, skeleton, joints and internal organs without the use of radiation. A few days ago the Villa Verde polyclinic hospital - a healthcare provider of the national health system - started using their 1.5 Tesla machine, one of the most modern and technical advanced on the market today to perform comprehensive examinations with significantly better image quality, opening new horizons for clinical applications for organ systems that were difficult to evaluate before.. The Radiology staff of Villa Verde polyclinic hospital has also ...
Implant placing procedure. During the first meeting, the correct diagnosis is established based on CBCT scans or digital orthopan images, and a thorough specialist examination is performed. The patient is presented with the various dental care solutions of the situation at hand, taking into account his or her wishes.. The next stage after the clinical inspection is the planning of oral rehabilitation or the implanting intervention itself and familiarising the patient with the procedures.. The intervention is quick and painless - it takes approximately 20 minutes under local anaesthesia. The surgeon places a titanium screw into the jawbone, sutures the wound and lets the implant to bond (osseointegrates) with the bone.. The time to heal depends on the state of the patients bones and complexity of the intervention, but it usually takes from 3 to 6 months. During this period, a temporary crown or teeth can be made upon the patients request. When the bone heals, we proceed and manufacture the ...
Methods: CBCT images are commonly degraded by scattered radiations originating in the patient's body, and so the CT numbers of the CBCT images depend on data acquisition conditions and the patient size. However, the anatomical shape of each organ is not likely affected by scattered radiations, and so we used only the shape of major organs such as lungs and bones in the CBCT images, and replaced these CT numbers with those of the multi-slice CT (MSCT) images that were used for dose calculation in a treatment planning. As regards this alternative CT number we adopted the median of MSCT numbers in a segmented region of a major organ each corresponding to that in the CBCT images. We evaluated the validity of our segmented region (SR) method with images of eight patients with lung diseases. The number of irradiation beams was four. In this evaluation we used the distance-to-agreement (DTA) and γ analysis, and the dose-volume-histogram (DVH) analysis ...
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20. Introduction to Cone Beam Computed Tomography. Ernest W. N. Lam. This technology, first described in 1998 for applications in dentistry (Mozzo et al., 1998), employs a cone-shaped X-ray beam emanating from a point source coupled with a planar digital sensor. During image acquisition, both the radiation source and sensor rotate around the patient, who is stationary. There are two classes of cone beam systems currently, ones that employ small fields of view with dimensions of less than 8 cm, and large fields of view with dimensions of greater than 8 cm upward to 30 cm.. Unlike intraoral digital imaging, the anatomy of the area imaged is recreated in three dimensions rather than two. The three-dimensional (3D) elements that recreate the anatomy are referred to as cube-shaped volume elements or voxels. Small field of view systems (Figure 20.1) employ pixel dimensions as low as 0.076 mm while the larger field machines employ pixel dimensions of between 0.20 mm and 0.40 mm.. ...
There is strong evidence to support the hypothesis that increasing radiation dose to the prostate will increase the probability of cure. A major difficulty in pursuing dose escalation is the toxicity induced in the surrounding normal tissues. These normal tissues are irradiated as a consequence of planning margins used to guarantee the delivery of the prescribed dose to the entire clinical target volume prostate and seminal vesicles. The margins are constructed from clinical knowledge of uncertainties in daily patient positioning and organ motion. In these investigations, a new imaging technology, cone-beam computed tomography CT was developed to localize the prostate and surrounding tissues on a daily basis, allowing the radiation field to be applied with great precision. By increasing precision, more conformal treatment fields can be applied, reducing the dose to surrounding normal tissues and allowing the safe pursuit of dose escalation. This new imaging modality, flat-panel based cone-beam CT, has
Introduction Since the first introduced use of cone beam computed tomography (CBCT) in the maxillo¬facial region it has been increasingly popular. In contrast to 2D imaging modalities such as periapical and panoramic radiographic techniques, CBCT provides some valuable information from...
Press release - Transparency Market Research - Cone Beam Computed Tomography (CBCT) Market - Positive long-term growth outlook 2023 - published on openPR.com
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An X-ray projection exposure apparatus includes a mask stage configured to hold a mask having a predetermined pattern thereon, a substrate stage configured to hold a substrate, and an X-ray source that emits exposing X-rays and detection light having a wavelength different from the exposing X-rays for use in detecting a position of at least one of the mask and the substrate. The apparatus further includes an X-ray illumination optical system configured to direct the exposing X-rays and the detection light towards the mask, an X-ray projection and focusing optical system for receiving the exposing X-rays that have interacted with the mask, and projecting and focusing an image of the predetermined pattern on the mask onto the substrate, and a detector for detecting the detection light that has interacted with the mask to derive the position of the at least one of the mask and the substrate.
Cleveland, OH (PRWEB) February 12, 2015 -- Plexar Associates, Inc. announces the completion and peer review submittal of a detailed compilation report:
Despite Dr. Christensens blunt evaluation of the state of the U.S. implant business, the atmosphere throughout the discussion that followed was that of a lively and cordial scholarly debate, peppered with humorous asides. When the efficacy of mini-implants was being discussed, M. Nader Sharifi, DDS, expressed his approval for the devices accordingly: Theres a risk of dropping the tiny screw into the patients mouth, but the greatest risk is dropping it on the floor, asking the staff to bring it into sterilization, and then requesting the other one.. Through it all, Dr. Christensen, who practices in a predominantly lower-income region, kept the dialogue rooted in actionable solutions. Were back to boutique dentistry. Lets talk about real people, he chided one panelist.. Balancing those realms drove the discussion about the usage of cone-beam CT (CBCT) for even a single implant. While the panel agreed that CBCT allows for a more informed procedure, only about five of the roughly three ...
H. Salehi, M. Mahdian, H. Alnajjar, and A. Tadinada, Utilizing Optical Coherence Tomography and Cone Beam Computed Tomography for Oral Tissues Characterization: ex vivo Study, in Biomedical Optics 2016, OSA Technical Digest (online) (Optical Society of America, 2016), paper JTu3A.52 ...
Authors: Jorge NR Martins, Moataz-Bellah AM Alkhawas, Zaher Altaki, Gianmarco Bellardini, Luiza Berti, Carlos Boveda, Antonis Chaniotis, Daniel Flynn, Jose Antonio Gonzalez, Jojo Kottoor, Miguel Seruca Marques, Adam Monroe, Hani F Ounsi, Peter Parashos, Gianluca Plotino, Magnus E Ragnarsson, Ruben Rosas Aguilar, Fabio Santiago, Hussein C Seedat, Walter Vargas, Murilo von Zuben, Yuerong Zhang, Yongchun Gu, Antonio Ginjeira
Cone beam computed tomography imaging represents a paradigm shift for enhancing diagnosis and treatment planning. Questions regarding cone beam computed tomographys associated legal responsibility are addressed, including cone beam tomography necessity, recognition of pathosis in the scans entire volume, adequate training, informed consent and/or refusal and current court status of cone bean computed tomography. Judicious selection and prudent use of cone beam computed tomography technology to protect and promote patient safety and efficacious treatment complies with the standard of care.. ...
CBVT, or Cone Beam Volumetric Tomography, is a compact, fast and safe way of acquiring 3D dental imaging. No appointment needed, just bring your referral.
October 9, 2008 -- X-ray imaging in dentistry is rapidly moving toward 3D, and it is time for general dentists to take note. The first FDA-approved cone-beam CT (CBCT) system was in the year 2000, but since that time many competitors have entered the marketplace. Discuss ...