Results 221 to 230 of about 179,231 (267)

Hyperparameter estimation for emission computed tomography data

Proceedings 1999 International Conference on Image Processing (Cat. 99CH36348), 1999
Although many statistical methods have been proposed for the restoration of tomographic images, their use in medical environments has been limited due to two important factors. These factors are the need for greater computational time than deterministic methods and the selection of the hyperparameters in the image models.
Antonio López, Rafael Molina 0001, Aggelos K. Katsaggelos   +2 more
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Introduction to neutron stimulated emission computed tomography

Physics in Medicine and Biology, 2006
Neutron stimulated emission computed tomography (NSECT) is presented as a new technique for in vivo tomographic spectroscopic imaging. A full implementation of NSECT is intended to provide an elemental spectrum of the body or part of the body being interrogated at each voxel of a three-dimensional computed tomographic image.
Carey E, Floyd, Janelle E, Bender, Amy C, Sharma, Anuj, Kapadia, Jessie, Xia, Brian, Harrawood, Georgia D, Tourassi, Joseph Y, Lo, Alexander, Crowell, Calvin, Howell   +9 more
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Infrared emission computed tomography

Annual Meeting Optical Society of America, 1985
The problem of deducing the temperature profile of a weakly inhomogeneous, incoherent radiating object from external field measurements is addressed within the framework of classical second-order scalar coherence theory. Within this framework it is shown that the problem can be cast into an inverse radiometric problem using the concepts of generalized ...
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Positron emission computed tomography

1985
Regional myocardial blood flow and substrate metabolism can be non-invasively evaluated and quantified with positron emission computed tomography (Positron-CT). Tracers of exogenous glucose utilization and fatty acid metabolism are available and have been extensively tested. Specific tracer kinetic models have been developed or are being tested so that
Maleah Grover, Heinrich R. Schelbert
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Attenuation Correction in Gamma Emission Computed Tomography

Journal of Computer Assisted Tomography, 1981
A method of computing tomographic images from single photon radionuclide emission data is presented. The method takes into account attenuation of gamma rays inside the source and makes use of an iterative technique, based on the difference between the projection data obtained from the source and computed projections, called reprojections, from ...
T E, Walters, W, Simon, D A, Chesler, J A, Correia   +3 more
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Myocardial Imaging Using Emission Computed Tomography

Radiology, 1978
Single-photon emission computed tomography (ECT) was evaluated during myocardial studies in dogs. Acute anterior and posterior infarcts were imaged following injection of 99mTc-pyrophosphate or 201Tl. In most cases, tomographic delineation of infarct location and extent correlated with tissue section.
J W, Keyes, P F, Leonard, D J, Svetkoff, S L, Brody, W L, Rogers, B R, Lucchesi   +5 more
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Iterative reconstruction techniques in emission computed tomography

Physics in Medicine and Biology, 2006
In emission tomography statistically based iterative methods can improve image quality relative to analytic image reconstruction through more accurate physical and statistical modelling of high-energy photon production and detection processes. Continued exponential improvements in computing power, coupled with the development of fast algorithms, have ...
Jinyi, Qi, Richard M, Leahy
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QUANTITATIVE POTENTIALS OF DYNAMIC EMISSION COMPUTED TOMOGRAPHY

Journal of Computer Assisted Tomography, 1979
Statistical uncertainties in emission computed tomography were simulated in 60 computer studies involving various numbers of events and distributions of activity. Previous studies have shown that for a uniform disc of activity of rms percentage of uncertainty per resolution cell is: 120 X (number of resolution cells)1/4 X (number of events per ...
T F, Budinger, S E, Derenzo, W L, Greenberg, G T, Gullberg, R H, Huesman   +4 more
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Single photon emission computed tomography in epilepsy

Seminars in Nuclear Medicine, 1990
Functional brain imaging by either single photon emission computed tomography (SPECT) or positron emission tomography (PET) is now a well-established technique in the diagnosis and evaluation of the epilepsies. Perhaps only in stroke have these emerging technologies proven of greater significance. Scalp, cortical, or depth electroencephalographic (EEG)
M D, Devous, R F, Leroy, R W, Homan
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Positron emission tomography and single photon emission computed tomography

Current Opinion in Neurology, 1996
Neuroimaging techniques have had a dramatic impact on the evaluation and treatment of patients with epilepsy. In order to take full advantage of their potential, it is important to place them in clinical and electrophysiological context and to understand their technical limitations. Positron emission tomography with 18F-2-deoxyglucose and single photon
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