Results 291 to 300 of about 2,320,219 (340)
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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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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.
Daniel M. Mittleman +3 more
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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.
Daniel M. Mittleman +3 more
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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 G. Ramm, Alexander Katsevich
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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 G. Ramm, Alexander Katsevich
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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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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.
Erik L. Ritman +2 more
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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.
Erik L. Ritman +2 more
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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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Inverse Problems, 1995
The authors explain how the local tomography approach to tomographic problems can be extended to a wide range of situations including limited data problems, attenuated transforms and generalized Radon transforms. Numerical examples illustrate the use of local tomography applied to complete and limited data problems.
L Mogilevskaya +2 more
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The authors explain how the local tomography approach to tomographic problems can be extended to a wide range of situations including limited data problems, attenuated transforms and generalized Radon transforms. Numerical examples illustrate the use of local tomography applied to complete and limited data problems.
L Mogilevskaya +2 more
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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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