Results 271 to 280 of about 36,424 (314)
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Towards cone-beam CT thermometry
SPIE Proceedings, 2013Temperature monitoring and therefore the final treatment zone achieved during a cone-beam CT (CBCT) guided ablation can prevent overtreatment and undertreatment. A novel method is proposed to detect changes in consecutive CBCT images obtained from projection reconstructions during an ablation procedure.
Ming Li +8 more
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2018
Cone beam computed tomography is a form of tomographic imaging. It is a derivative of multidetector computed tomography. CBCT is a technology characterized by compromises. As a consequence, CBCT has limited capabilities, most notably the inability to differentiate soft tissue densities and meager computational capacities of the image-processing system.
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Cone beam computed tomography is a form of tomographic imaging. It is a derivative of multidetector computed tomography. CBCT is a technology characterized by compromises. As a consequence, CBCT has limited capabilities, most notably the inability to differentiate soft tissue densities and meager computational capacities of the image-processing system.
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A phantom for testing Cone Beam CTs
Physical and Engineering Sciences in Medicine, 2020Cone Beam Computed Tomography (CBCT) scanners are becoming more common for dental and maxillofacial/head scanning, but performing image quality tests on these systems is difficult. There are quality assurance (QA) phantoms commercially available but they can be expensive, bulky and not optimised for CBCT imaging limits.
Steven Muir, Johnny Laban
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Cone-Beam CT: Applications in Orthodontics
Dental Clinics of North America, 2008Radiographic images have always been an important part of orthodontic diagnosis and treatment planning. We have been limited by the two-dimensional nature of these radiographs as we pursue tooth movement in a three-dimensional fashion. This article shows the current and future uses and advantages of cone-beam CT in the practice of orthodontics. The use
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Image artifact in dental cone-beam CT
Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, 2006The purpose of this study was to investigate the appearance and possible cause of an artifact seen in limited-volume cone-beam CT imaging.A water-filled plastic cylinder was used as a phantom of the head. A test object was constructed as a bone-equivalent phantom to be imaged.
Akitoshi, Katsumata +7 more
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2019
Cone-beam CT (CBCT) systems have emerged in a broad variety of forms and clinical applications. The diversity of platforms includes open-gantry C-arms and U-arms as well as closed-gantry rings. Applications span a spectrum of image-guided interventions (e.g., image-guided radiotherapy, surgery, and interventional radiology) and specialty diagnostic ...
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Cone-beam CT (CBCT) systems have emerged in a broad variety of forms and clinical applications. The diversity of platforms includes open-gantry C-arms and U-arms as well as closed-gantry rings. Applications span a spectrum of image-guided interventions (e.g., image-guided radiotherapy, surgery, and interventional radiology) and specialty diagnostic ...
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Auto calibration of a cone‐beam‐CT
Medical Physics, 2012Purpose:This paper introduces a novel autocalibration method for cone‐beam‐CTs (CBCT) or flat‐panel CTs, assuming a perfect rotation. The method is based on ellipse‐fitting. Autocalibration refers to accurate recovery of the geometric alignment of a CBCT device from projection images alone, without any manual measurements.Methods:The authors use test ...
Daniel, Gross +4 more
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Dose calculation using megavoltage cone-beam CT
International Journal of Radiation Oncology*Biology*Physics, 2007To demonstrate the feasibility of performing dose calculation on megavoltage cone-beam CT (MVCBCT) of head-and-neck patients in order to track the dosimetric errors produced by anatomic changes.A simple geometric model was developed using a head-size water cylinder to correct an observed cupping artifact occurring with MVCBCT.
Olivier, Morin +9 more
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Quantitative cone beam megavoltage CT
2000In recent years there has been increasing interest in cone beam megavoltage CT (MVCT) using the photon beam of a treatment machine and an electronic portal imaging device (EPID), see e. g. [1]. So far this technique has been investigated with respect to its potential in patient set-up control, which requires high contrast and adequate spatial ...
L. Spies +4 more
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Cone-beam CT from width-truncated projections
Computerized Medical Imaging and Graphics, 1996In this paper we report cone-beam CT techniques that permit reconstruction from width-truncated projections. These techniques are variants of Feldkamp's filtered backprojection algorithm and assume quasi-redundancy of ray integrals. Two methods are derived and compared. The first method involves the use of preconvolution weighting of the truncated data.
P S, Cho, A D, Rudd, R H, Johnson
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