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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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.
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.
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 ...
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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- ...
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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Reduce your exposure to radiation during dental procedures with i-CAT Cone Beam 3D Dental Imaging from Metropolitan Craniofacial Center. 973-736-7616
Tyler, TX (PRWEB) March 29, 2014 -- Patients of Dr. Loyd Dowd can now benefit from the detailed three-dimensional images produced by the Cone Beam CT scan
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An improved method and apparatus for preprocessing cone beam attenuation data to reconstruct a three dimensional image of a particular region of interest of an object by a process of inverse Radon transformation is described. The number of required operations is substantially reduced by selectively retaining for further processing only that cone beam attenuation data acquired within a select closed region of the surface of the array detector wherein this region provides data corresponding to beams actually attenuated in passing through the region of interest of the object. In this manner, unnecessary beam attenuation data is discarded at the earliest possible opportunity to expedite image processing.
Cone Beam Computed Tomography: We have added a new dimension in dentistry by installing a game changing imaging technology -a first of its kind in dental centre in Kerala Cone Beam Computed Tomography (CBCT). One that promises to transform the diagnosis and treatment of many dental and oral abnormalities. This new technology reduces the radiation doses to the patient when composed to the conventional CT examinations. CBCT is widely used in Oral Implant Planning and Placement.. In endodontics it increases the success rate of root canal treatments and also used for the diagnosis and treatment planning of (TMJ) Tempero Mandibular Joint Abnormalities.. ...
We are now using the latest in dental imaging technology, the i-CAT FLX, a Cone Beam 3-D dental imaging system that is capable of full 3D imaging at lower doses than traditional 2D panoramic imaging. Cone Beam technology is quickly advancing the dental industrys leading approach to treatment planning and diagnosis. With a quick scan around the patients head, CV Dental Care can now view 3-D patient anatomy to accomplish, more precise evaluation for predictable treatment results in shorter appointment times for the patient.. ...
We are now using the latest in dental imaging technology, the i-CAT FLX, a Cone Beam 3-D dental imaging system that is capable of full 3D imaging at lower doses than traditional 2D panoramic imaging. Cone Beam technology is quickly advancing the dental industrys leading approach to treatment planning and diagnosis. With a quick scan around the patients head, CV Dental Care can now view 3-D patient anatomy to accomplish, more precise evaluation for predictable treatment results in shorter appointment times for the patient.. ...
X-rays revolutionized dental care in the 20th Century. The same could happen in the 21st Century as cone beam computed tomography (CBCT) becomes a fixture beside the traditional x-ray machine.. CBCT made its debut in dental offices about a decade and a half ago. It utilizes the same invisible energy as traditional x-rays to create images of the face and jaw. But unlike traditional x-rays, which can only depict structures in the two dimensions of width and height, CBCT can create three-dimensional images in amazing detail.. The CBCTs x-ray projector rotates around a patients head. As it emits a cone-shaped beam of x-rays, the device simultaneously collects anywhere from 150 to 599 distinct image views. It transmits these views to a computer that assembles them into three-dimensional images that can be viewed on a computer display.. From the data file of images, dentists can re-format a variety of views and angles of teeth, jaws and other facial bones at various levels of magnification. Because ...
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Computed Tomography is similar to a CT scan in a medical situation. It uses x-ray technology to obtain cross sectional images that are much more detailed than regular x-rays. CBCT is not limited to viewing bone. With this technology, soft tissue, muscles, and blood vessels may also be seen clearly. The cone beam is faster version of a medical CT scan. It uses a cone-shaped x-ray to minimize radiation exposure and takes less time than a traditional scan. Under normal conditions, a CBCT takes less than one minute and offers up to one hundred times less radiation dosage than a regular CT scan.. ...
CT values in the CBCT images of the CATPhan(R) were highly variable depending on the image acquisition parameters: a mean difference of 564 HU +/- 377 HU was calculated between CT values determined from the planning CT and CBCT images. Hence, two protocols were selected for CBCT imaging in the further part of the study and HU-D tables were always specific for these protocols (pelvis and thorax with M20F1 filter, 120 kV; head S10F0 no filter, 100kV). For dose calculation in real patient CBCT images, the largest differences between CT and CBCT were observed for the standard CT HU-D table: differences were 8.0 % +/- 5.7 %, 10.9 % +/- 6.8 % and 14.5 % +/- 10.4 % respectively for pelvis, thorax and head patients using clinical treatment plans. The use of patient and group based HU-D tables resulted in small dose differences between planning CT and CBCT: 0.9 % +/- 0.9 %, 1.8 % +/- 1.6 %, 1.5 % +/- 2.5 % for pelvis, thorax and head patients, respectively. The application of the phantom based HU-D table ...
Yoshifumi Morita, Noritaka Sato, Hiroyuki Ukai, Hirofumi Tanabe, Toru Nagao, Rumi Tanemura,Yoshiaki Takagi, and Yoshitaka Aoki, Clinical Evaluation of Training System for Recovery of Motor Function after troke in Patients with Hemiplegia, Proceedings of the 2nd International Conference on NeuroRehabilitation (ICNR2014 in Aalborg, Denmark) pp,83-92 (2014.6) (Biosystems & Biorobotics, Volume 7 2014, Replace, Repair, Restore, Relieve - Bridging Clinical and Engineering Solutions in Neurorehabilitation, Editors: Winnie Jensen, Ole Kæseler Andersen, Metin Akay, Springer ...
And Morita, F. (1988). J. Biochem. (Tokyo) 103, 15-18. , and Morita, F. (1990). J. Biochem. (Tokyo) 108, 909-913. , and Morita, F. (1992). J. Biochem. (Tokyo) 111, 798-803. , and Arner, A. (1985). Pfliiegers Arch. 405, 323-328. Helper, D. , Lash, J. , and Hathaway, D. R. (1988). J. Biol. Chem. 263, 15748-15753. , and Ikebe, M. (1995). FEBS Lett. 363, 57-60. , Somlyo, A. , Goldman, Y. , and Somlyo, A. P. (1989). J. Gen. Physiol. 94, 769-781. , and Hartshorne, D. J. (1985). J. Biol. Chem. 260, 1002710031. M . . . . . . . . . . . . . . . . . . G S . . . . . . . - . S . . . - Y- 120 . . . . . . . . . I-Q-E-D- . S . . . S . . I . S . H. - . T . . . H . 150 160 . 9 9 9 o 9 9 9 9 9 9 9 9 9 9 9 9 , 9 o , o o , o 9 o , 9 9 9 9 9 , , ,-- 9 9 9 9 9 9 9 9 9 9 9 . 9 9 9 9 9 9 9 9 9 9 9 9 9 9 o 9 9 9 9 . 9 9 o- HsmRLC H . . CceRLC I-L-K-H-G-A-K-D-K-D-D LC20-A . . . . . . LC20-BI . . . . . . RamRLC HsmRLC . This idea of Helper et al. was further elaborated by Hasegawa and Morita (1992), who exchanged the ...
The ultrafast CT scanner is located in a large room. Your child will lie on a narrow table that slides into the hollow tube-shaped scanner.. Your child will have an intravenous (IV) line if contrast medication is being used. The contrast medication may be injected prior to the procedure or during the procedure.. The CT technologist will be in an adjacent room where the equipment controls are located. However, they will be able to see your child through a large window and will be monitoring him or her constantly during the procedure. If your child is not sedated, he or she will be given a call bell device to let the staff know if he or she needs anything during the procedure. Speakers are located inside the scanner so that your child can hear instructions from the CT staff and they can hear your child respond.. Once the procedure begins, your child will need to be remain very still at all times so that movement will not adversely affect the quality of the images. At intervals, he or she will be ...
The ultrafast CT scanner is located in a large room. Your child will lie on a narrow table that slides into the hollow tube-shaped scanner.. Your child will have an intravenous (IV) line if contrast medication is being used. The contrast medication may be injected prior to the procedure or during the procedure.. The CT technologist will be in an adjacent room where the equipment controls are located. However, they will be able to see your child through a large window and will be monitoring him or her constantly during the procedure. If your child is not sedated, he or she will be given a call bell device to let the staff know if he or she needs anything during the procedure. Speakers are located inside the scanner so that your child can hear instructions from the CT staff and they can hear your child respond.. Once the procedure begins, your child will need to be remain very still at all times so that movement will not adversely affect the quality of the images. At intervals, he or she will be ...
Análise da anatomia interna do segundo pré-molar superior por tomografia computadorizada cone beam / Ex vivo analysis of the internal anatomy of maxilary second premolar by cone beam computerized tomography
The CurveBeam LineUp is a versatile weight-bearing CBCT scanner that images the knee and lower extremities with ease. Learn More |
Of course I had to rebuild the mex files for linux and need to download the phantom3d.m file to have a testing phantom.. All this is done and you code seems to work. So I have a large set of projections.. The point now is that it does not seems to be the projections I expected. There is a lot of empty lines and columns on the projections, as if there were an aliasing issue when computing lines integrals or something like that.. I use your sample code in your example post up here, but I update the Shepp-Logan phantom/matrix to 128x128x128 voxels of 2x2x2 mm.. hum, well now I want to attach a screen capt of the picture and a copy of one projection_x_y.mat ... but I dont found the attach file button on this web page :-((. An other question ...
Background: Since the introduction of cone beam computed tomography (CBCT) scanners in April, 2001, a large number of dental offices are taking and/or providing 3-dimensional imag- ing studies. The purpose of this study was to determine how and for what reason dentists currently utilize a 3D imaging center. Part I of this study consists of data of patients referred to a dental radiological lab for 3D CT scans including age, gender, purpose of the CT study, which arch was requested, if a radio- graphic guide was used, and in which format the study was requested to be processed.. ...
The demands of minimally in vasive surgical procedures have led to the widespread use of cone beam volumetric imaging (CBVI) in dental medicine. The book presents indications for this high-resolution diagnostic technique in all areas of dental medicine and provides case examples to illustrate the use of CBVI and its benefits to the patient and care provider. The DVD features on-screen videos demonstrating the possibilities for dynamic assessment of the case types presented in the text. This book/DVD set can be used routinely in the assessment of CBVI and is intended as a reference for professionals preparing to obtain certification to use the technology.. ISBN 978-3-938947-46-3 228 pp; 383 color illus ...