排序方式: 共有24条查询结果,搜索用时 15 毫秒
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为了在癌症外科手术中提供实时反馈,更精确地切除癌症组织,从而在术中导航领域展现应用潜力,利用光学相干层析成像(OCT)系统对39例胃癌患者肿瘤组织成像,并与对应位置的病理切片进行对比。结果表明:有效的38个病例的OCT图像能清晰地分辨癌症组织与正常组织的差别,其中有4例黏液型胃癌,黏液型胃癌的肿瘤分泌的黏液会破坏胃组织的层状结构,导致纹理紊乱,黏膜残缺;黏液对光的背向散射更弱以及与黏膜组织的背向散射对比相差更大使得黏液型胃癌的OCT图像成像更清晰,B型超声扫描(B-scan)的OCT图像能够分辨该种类型癌症的边界区域;将B-scan的OCT图像进行三维(3D)重建后显示整个成像区域的体结构,经过表面展平后提取深度方向上不同层的切面图像,提供了另一维度视角观察胃癌组织的边界区域,与B-scan图像交叉验证可以显示优异的区分效果。 相似文献
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A Fabry-Perot (F-P) etalon and a semiconductor optical amplifier (SOA) were combined to preprocess the data signals before clock recovery. With this technology in the 10-Gb/s clock recovery utilizing injection mode-locked laser (IMLL) based on SOA, the amplitude fluctuation and timing jitters caused by the pattern effect in recovered clock pulses were greatly reduced, experimentally. It also demonstrated that clock could be recovered from the very degraded signals. 相似文献
23.
Mitigation of signal quality degradation induced by PMD using synchronous modulation 总被引:1,自引:0,他引:1
In-line synchronous modulation as a way of mitigating the signal quality degradation induced by polarization mode dispersion (PMD) was experimentally studied using 10-Gb/s return to zero signal. Bit error rate of the degraded signal and the synchronously modulated signal under the differential group delay (DGD) values of 10, 20, 34, and 70 ps was measured and compared. The experimental results showed that in-line synchronous modulation is useful to mitigate the signal quality degeneration induced by PMD. 1-dB power penalty reduction was obtained even when the PMD was as high as 70% of the bit interval. The limitation of method is also discussed. 相似文献
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