Results 211 to 220 of about 1,128,982 (269)
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Dental Clinics of North America, 1993
Conventional tomography is used in dentistry to demonstrate objects lying in a plane of interest distinct from their surrounding anatomic structures. Through technique parameters, which generate the controlled blurring of structures above and below the plane of interest, anatomic structures are visualized without the superimposition noted on other ...
D K, Kassebaum, J D, McDowell
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Conventional tomography is used in dentistry to demonstrate objects lying in a plane of interest distinct from their surrounding anatomic structures. Through technique parameters, which generate the controlled blurring of structures above and below the plane of interest, anatomic structures are visualized without the superimposition noted on other ...
D K, Kassebaum, J D, McDowell
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SIAM Journal on Applied Mathematics, 1996
The authors propose a pseudolocal tomography concept. Let \(d > 0\) be fixed, they consider the following pseudolocal tomography formula \[ f_d (x) = {1 \over 4 \pi^2} \int_{S^1} \int^{x. \theta + d}_{x. \theta - d} {\widehat f_d(\theta, p) \over x.
Alexander Katsevich, Alexander G. Ramm
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The authors propose a pseudolocal tomography concept. Let \(d > 0\) be fixed, they consider the following pseudolocal tomography formula \[ f_d (x) = {1 \over 4 \pi^2} \int_{S^1} \int^{x. \theta + d}_{x. \theta - d} {\widehat f_d(\theta, p) \over x.
Alexander Katsevich, Alexander G. Ramm
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Proceedings of the 2012 Internet Measurement Conference, 2012
The objective of early network tomography approaches was to produce a point estimate for the performance of each network link (Analog tomography). When it became clear that the previous approach is error-prone in practice, research shifted to Boolean tomography where each link is estimated as either "good" or "bad".
Sajjad Zarifzadeh +2 more
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The objective of early network tomography approaches was to produce a point estimate for the performance of each network link (Analog tomography). When it became clear that the previous approach is error-prone in practice, research shifted to Boolean tomography where each link is estimated as either "good" or "bad".
Sajjad Zarifzadeh +2 more
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Clinical Radiology, 1965
Summary The separating factor or thickness of cut for a tomographic section is often described as being from 1 to 2 mm. Evidence is presented that in the case of the larynx this does not present a true picture. It is shown that the effective thickness of a tomographic section for this organ is often over 1 cm. In tomography of the larynx, thinness of
G M, Ardran, E, Emrys-Roberts
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Summary The separating factor or thickness of cut for a tomographic section is often described as being from 1 to 2 mm. Evidence is presented that in the case of the larynx this does not present a true picture. It is shown that the effective thickness of a tomographic section for this organ is often over 1 cm. In tomography of the larynx, thinness of
G M, Ardran, E, Emrys-Roberts
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Acta Radiologica. Diagnosis, 1977
Tomographic depiction using Xerox plates was compared with that of screen film tomography. The Xerox plates entail much higher demands as to the quality of tomographic blurring than screen film combinations. Circular or hypocycloid movements give rise to errors of depiction which are more disturbing in xerographic tomography due to the fact that the ...
C G, Helander, S, Reichmann, K, Astrand
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Tomographic depiction using Xerox plates was compared with that of screen film tomography. The Xerox plates entail much higher demands as to the quality of tomographic blurring than screen film combinations. Circular or hypocycloid movements give rise to errors of depiction which are more disturbing in xerographic tomography due to the fact that the ...
C G, Helander, S, Reichmann, K, Astrand
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BIOIMPEDANCE TOMOGRAPHY (ELECTRICAL IMPEDANCE TOMOGRAPHY)
Annual Review of Biomedical Engineering, 2006Electrical impedance tomography (EIT) is a relatively new imaging method that has evolved over the past 20 years. It has the potential to be of great value in clinical diagnosis; however, EIT is a technically difficult problem to solve in terms of developing hardware for data capture and the algorithms to reconstruct the images.
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Positron Emission Tomography/Computed Tomography
Seminars in Nuclear Medicine, 2008Accurate anatomical localization of functional abnormalities obtained with the use of positron emission tomography (PET) is known to be problematic. Although tracers such as (18)F-fluorodeoxyglucose ((18)F-FDG) visualize certain normal anatomical structures, the spatial resolution is generally inadequate for accurate anatomic localization of pathology.
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2011
Traditionally, cellular specimens and tissues have been prepared for electron microscopy by chemical fixation or rapid freezing followed by freeze substitution and plastic embedding. Once embedded in a solid polymer, sections are obtained by room-temperature microtomy.
Andreas, Hoenger +1 more
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Traditionally, cellular specimens and tissues have been prepared for electron microscopy by chemical fixation or rapid freezing followed by freeze substitution and plastic embedding. Once embedded in a solid polymer, sections are obtained by room-temperature microtomy.
Andreas, Hoenger +1 more
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Dental Clinics of North America, 1993
Although CT scanning has been available for less than 20 years, it has made a major impact on the practice of dentistry, particularly in oral and maxillofacial surgery, in the diagnosis and management of a wide variety of oral lesions. The use of computers to reconstruct x-ray attenuation data into an image allows the clinician to view pathology from ...
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Although CT scanning has been available for less than 20 years, it has made a major impact on the practice of dentistry, particularly in oral and maxillofacial surgery, in the diagnosis and management of a wide variety of oral lesions. The use of computers to reconstruct x-ray attenuation data into an image allows the clinician to view pathology from ...
openaire +2 more sources