A fast and simple method to extract phase-contrast images from interferograms is proposed, and its effectiveness is demonstrated through simulation and experiment. For x-ray differential phase contrast imaging, a stro...A fast and simple method to extract phase-contrast images from interferograms is proposed, and its effectiveness is demonstrated through simulation and experiment. For x-ray differential phase contrast imaging, a strong attenuation signal acts as an overwhelming background intensity that obscures the weak phase signal so that no obvious phase-gradient information is detectable in the raw image. By subtracting one interferogram from another, chosen at particular intervals,the phase signal can be isolated and magnified.展开更多
基金Supported by Key Project of National Natural Science Foundation of China,No.30830040Outstanding Youth Funding Project of China,No.30325027Key Project of Natural Science Foundation of CQ CSTS,No.CSTC2006BA5020
文摘瞄准:为了调查非热的损坏的病理学的特征,由搏动的高紧张导致了与超声对比代理人(UCA ) 相结合的集中的超声(PHIFU ) , SonoVue (Bracco 矿泉,米兰,意大利) 在兔子肝 VX2 肿瘤。方法:肝 VX2 肿瘤模型在 20 只兔子被建立,它随机被划分成与超声对比代理人组(PHIFU + UCA 组) 和假冒的组相结合的 PHIFU。在 PHIFU + UCA 组, SonoVue 的 0.2 mL 静脉内地被注入肿瘤,由 ISP 5900 W/cm2 的超声暴露列在后面。兔子在超声暴露以后有天被牺牲。暴露的肿瘤纸巾的标本在轻显微镜和传播电子显微镜下面病理地被获得并且观察。留下的肿瘤纸巾被去请染色的 2,3,5-Triphenyltetrazolium 氯化物(TTC ) 。结果:在染色的 TTC 前,在两个的肿瘤纸巾假冒并且 PHIFU + UCA 组类似于灰色的鱼肉。在染色的 TTC 以后,肿瘤纸巾是一致地染色的红,与在肿瘤织物和正常织物之间的一条清楚的边界。组织学的检查在 PHIFU + UCA 组显示出肿瘤房间损害的符号,与各种各样的尺寸,染色质着边和核固缩的细胞质的液泡。电子显微镜检查揭示了肿瘤房间体积减小,核固缩,染色质着边,拓宽的细胞间隙,在细胞质的高电子密度 apoptotic 身体和液泡的存在。结论:与 UCA 相结合的 PHIFU 的非热的效果能被用来切除兔子肝 VX2 肿瘤。
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61101175,61571305,and 61227802)
文摘A fast and simple method to extract phase-contrast images from interferograms is proposed, and its effectiveness is demonstrated through simulation and experiment. For x-ray differential phase contrast imaging, a strong attenuation signal acts as an overwhelming background intensity that obscures the weak phase signal so that no obvious phase-gradient information is detectable in the raw image. By subtracting one interferogram from another, chosen at particular intervals,the phase signal can be isolated and magnified.