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The use of computed tomography in recurrent rectal tumors 总被引:5,自引:1,他引:4
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Work in progress: [18F] fluorodeoxyglucose and positron emission tomography in the evaluation of radiation necrosis of the brain 总被引:3,自引:0,他引:3
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Quantitative coronary arteriography: design and validation 总被引:1,自引:0,他引:1
The authors assessed the performance of an automatic and rapid coronary quantification method by evaluating its accuracy in a stenosis phantom. Measurements were obtained with a lucite phantom with 2-, 3-, and 4-mm vessel diameters and concentric stenoses of 33%, 50%, 67%, and 75%. Direct digital angiographic images as well as 10 X 10 spot films and 35-mm cine angiography films were acquired with and without structural noise and mask subtraction. The films were digitized with magnification factors of one and two. An interactive analysis program was used to automatically determine the vessel edges with a Gaussian fit to the cross-sectional density profiles perpendicular to the center line of the vessel. Relative changes of the densitometric cross-sectional area along the vessel were used to assess the percentage of stenosis. Densitometric measurements were comparable in both digital and cine angiograms (r = .99 and r = .98, respectively); however, diameter measurements showed a higher variability and were dependent on the amount of magnification applied to the images. 相似文献
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Clairton F de Souza MD PhD Monica L Acosta BSc MSc PhD Philip J Polkinghorne MD FRANZCO Charles NJ McGhee MB BSc PhD FRANZCO Michael Kalloniatis MSc PhD 《Clinical & experimental optometry》2013,96(5):504-507
We localised amino acids in the mid‐peripheral aged human retina and a retina that had undergone radiation treatment 10 years earlier. The distribution pattern of glutamate, γ‐amino butyric acid (GABA), glycine, glutamine and taurine, reflected patterns established in the primate retina. The retina that had undergone radiation exposure displayed both anatomical and neurochemical remodelling. The proximal retina comprised around 40 to 45 per cent of the total retina and neuronal kinesis and aberrant neuronal projections were also present. Amino acid neurochemistry was strikingly different with Müller cells displaying GABA loading, glycinergic neurons displaced and displaying a very high level of glycine labelling. We conclude that radiation exposure triggered these changes in the human retina and likely reflects general remodelling of structure and function following ischaemic damage to endothelial cells. 相似文献
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A Oros MJ Houtman P Neco AM Gomez S Rajamani P Oosterhoff NJ Attevelt JD Beekman MAG van der Heyden L Ver Donck L Belardinelli S Richard G Antoons MA Vos for the CONTICA investigators 《British journal of pharmacology》2010,161(1):162-175