Results 191 to 200 of about 2,398,878 (243)
Some of the next articles are maybe not open access.
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.
openaire +2 more sources
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.
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
European Neurology, 1989
Lacunes consist of small vascular lesions with a volume of between 2 and about 30 mm. These lacunar infarctions are determined by an ischemia caused by obstructive diseases of small terminal vessels in the deep areas of the brain. While magnetic resonance currently appears to be a more sensitive diagnostic tool than computed tomography (CT) as far as ...
F, Zappoli, A, Lavaroni, M, Leonardi
openaire +2 more sources
Lacunes consist of small vascular lesions with a volume of between 2 and about 30 mm. These lacunar infarctions are determined by an ischemia caused by obstructive diseases of small terminal vessels in the deep areas of the brain. While magnetic resonance currently appears to be a more sensitive diagnostic tool than computed tomography (CT) as far as ...
F, Zappoli, A, Lavaroni, M, Leonardi
openaire +2 more sources
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 ...
openaire +2 more sources
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
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.
Katsevich, Alexander I. +1 more
openaire +2 more sources
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.
Katsevich, Alexander I. +1 more
openaire +2 more sources
SIAM Journal on Applied Mathematics, 1992
Tomography produces the reconstruction of a function \(f\) from a large number of line integrals of \(f\). Conventional tomography is a global procedure in that the standard convolution formulas for reconstruction at a single point require the intervals over all lines within some plane containing the point.
Faridani, Adel +2 more
openaire +1 more source
Tomography produces the reconstruction of a function \(f\) from a large number of line integrals of \(f\). Conventional tomography is a global procedure in that the standard convolution formulas for reconstruction at a single point require the intervals over all lines within some plane containing the point.
Faridani, Adel +2 more
openaire +1 more source
Optics Letters, 1997
We demonstrate tomographic T-ray imaging, using the timing information present in terahertz (THz) pulses in a reflection geometry. THz pulses are reflected from refractive-index discontinuities inside an object, and the time delays of these pulses are used to determine the positions of the discontinuities along the propagation direction.
D M, Mittleman +3 more
openaire +2 more sources
We demonstrate tomographic T-ray imaging, using the timing information present in terahertz (THz) pulses in a reflection geometry. THz pulses are reflected from refractive-index discontinuities inside an object, and the time delays of these pulses are used to determine the positions of the discontinuities along the propagation direction.
D M, Mittleman +3 more
openaire +2 more sources
Physics in Medicine and Biology, 1988
The developments in positron emission tomography (PET) are reviewed with an emphasis on instrumentation for clinical PET imaging. After a brief summary of positron imaging before the advent of computed tomography, various improvements are highlighted including the move from PET scanners with septa to fully 3D scanners, changes in the preferred ...
Gerd, Muehllehner, Joel S, Karp
openaire +2 more sources
The developments in positron emission tomography (PET) are reviewed with an emphasis on instrumentation for clinical PET imaging. After a brief summary of positron imaging before the advent of computed tomography, various improvements are highlighted including the move from PET scanners with septa to fully 3D scanners, changes in the preferred ...
Gerd, Muehllehner, Joel S, Karp
openaire +2 more sources
Oral Surgery, Oral Medicine, Oral Pathology, 1976
Dynamic tomography is a radiographic procedure that allows details in a thin layer within the patient to be examined. This layer can be moved at will throughout the patient. Thus, details lying in an infinite number of layers can be scrutinized one layer at a time. Eight underexposed radiographs are made under rigid controls.
openaire +2 more sources
Dynamic tomography is a radiographic procedure that allows details in a thin layer within the patient to be examined. This layer can be moved at will throughout the patient. Thus, details lying in an infinite number of layers can be scrutinized one layer at a time. Eight underexposed radiographs are made under rigid controls.
openaire +2 more sources