͑CTAS͒, were studied as a function of temperature, up to 900°C. The dielectric permittivity 11 and piezoelectric coefficient d 11 of the ordered crystals were found to be on the orders of 12-16 and 4-5 pC/N, respectively, slightly lower than langasite ͑La 3 Ga 5 SiO 14 -LGS͒ or langanite ͑La 3 Ga 5.5 Nb 0.5 O 14 ͒ crystals which possess a disordered structure. The mechanical quality factor Q and electrical resistivity , however, were found to be greatly improved at elevated temperatures Ն500°C, being one to two orders of magnitude higher, due to cation ordering. Of particular interest is the CTAS crystal, in which, the Ga cations are totally replaced by low cost Al cations. Together with its thermally stable piezoelectric properties and high electrical resistivity, CTAS crystals offer a competitive material for high temperature sensing applications.
We consider multiview video compression: the problem of jointly compressing multiple views of a scene recorded by different cameras. To take advantage of the correlation between views, we propose using disparity compensated view prediction and view synthesis and describe how these features can be implemented by extending the H.264/AVC compression standard. Finally, we discuss experimental results on the test sequences from the MPEG Call for Proposals on multiview video.
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Some new radiotracers might add useful information and improve diagnostic confidence of 18 F-FDG imaging in tumors. A multicenter clinical trial was designed to investigate the diagnostic performance of dual-tracer ( 18 F-FDG and 39-deoxy-39-18 F-fluorothymidine [ 18 F-FLT]) PET/CT in pulmonary nodules. Methods: Fifty-five patients underwent dual-tracer imaging in 6 imaging centers using the same models of equipment and standardized protocols. The images were interpreted by a collective group of readers who were unaware of the clinical data. The diagnostic performance using either tracer alone or dual-tracers together, with or without CT, was compared. The histological diagnosis or clinical findings in a 12-mo follow-up period served as the standard of truth. Results: In 16 patients with malignant tumor, 16 with tuberculosis, and 23 with other benign lesions, the sensitivity and specificity of 18 F-FDG and 18 F-FLT were 87.5% and 58.97% and 68.75% and 76.92%, respectively. The combination of dual-tracer PET/CT improved the sensitivity and specificity up to 100% and 89.74%. The 3 subgroups of patients could be best separated when the 18 F-FLT/ 18 F-FDG standardized uptake value ratio of 0.4-0.90 was used as the threshold. Conclusion: By reflecting different biologic features, the dualtracer PET/CT using 18 F-FDG and 18 F-FLT favorably affected the diagnosis of lung nodules.
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