This imaging technique might be used to detect cellular disarray and degenerative changes in this sensitive circuit earlier than at 1.5 T or even 3.0 T. (C)RSNA, 2010″
“This

study reports on the URMC-099 order investigation and characterization of the different emitting centers within SiO2 codoped by Er3+ ions and silicon-excess. Erbium doped silicon-rich silicon oxide (SRSO:Er) thin films, fabricated by magnetron cosputtering at 500 degrees C, were analyzed by means of cathodoluminescence. The CL spectra of SRSO, Er-doped SiO2 and SRSO:Er were recorded and compared for various annealing temperatures. It was found that some specific optically-active point-defects called silicon-oxygen-deficient centers (SiODCs) are present in all kinds of samples. In the layers containing some excess Si, the phase separation between Si nanoclusters (Si-ncs) and SiO2 is observed when the annealing temperature reaches and exceeds 900 click here degrees C. The formation of Si-nc increases with annealing at the expense of SiODCs that was assumed to act as seeds for the growth of Si-nc.

For SRSO:Er samples, the contribution of SiODCs overlaps that due to Er3+ transitions in the visible range. The emissions from SiODCs are drastically reduced when an SRSO sample is doped with Er ions, whereas the Er emissions in the visible range start to be distinctly observed. We propose a scenario of energy transfer from SiODCs toward the Er ions, especially as the emissions from the Si-based entities (SiODCs, Si-nc) and from some transitions of Er ions are located in a same visible broad range. (C) 2010 American Institute of Physics. [doi:10.1063/1.3517091]“
“Purpose: To assess whether signal intensity (SI) different from that of cerebrospinal fluid (CSF) within the resection cavity during follow-up helps predict tumor progression in partially resected gliomas.

Materials and Methods: This

retrospective study had local institutional review board approval, with waiver of informed consent. Seventy-five patients with partially resected and irradiated gliomas were evaluated. SI within PXD101 purchase the resection cavity on fluid-attenuated inversion recovery (FLAIR) magnetic resonance (MR) images was qualitatively and quantitatively assessed during follow-up. Qualitative analysis comprised visual comparison of SI in the resection cavity with SI of normal CSF by two readers. SI of the cavity was quantitatively assessed with region-of-interest (ROI) analysis normalized to background noise, contralateral healthy white matter, and CSF. Normalized SI during follow-up was compared with SI immediately after resection. Tumor progression was defined as increase in longest glioma diameter of at least 20% (Response Evaluation Criteria in Solid Tumors). Sensitivity and specificity of elevated SI in resection cavities for predicting or indicating tumor progression were calculated.