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Angular filters for angular domain imaging optical tomography in highly scattering media

机译:用于高散射介质中的角域成像光学层析成像的角镜

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摘要

Angular Domain Imaging performs Optical Tomography imaging through highly scattering media by rejecting scattered light through micromachined Angular Filter Array (AFA) tunnels or an aperture-based Spatial Filter (SF) while accepting non-scattered light with only small angular deviations from the source. AFA imaging using a laser diode source (λ = 670 nm) resolves 153 µm structures at a Scattering Ratio (SR) of 10^7:1 in a milk-based scattering solution and 204 µm patterns for chicken tissue ±3.8 mm thick. Carbon deposition and NH4OH silicon roughening of the AFA tunnels is shown to reduce background scattered light. Smaller tunnel geometries and scan steps improve image resolution. A lens with aperture ADI Spatial Filtering was studied to verify theoretical predictions of the tradeoff between resolution and scattered light rejection. SF ADI with an Argon laser resolved 102 µm structures in a SR = 1.4×10^7:1 milk solution.
机译:角域成像通过拒绝通过微机械角滤镜阵列(AFA)隧道或基于孔径的空间滤镜(SF)的散射光,同时接受与源的角度偏差很小的非散射光,从而通过高散射介质执行光学层析成像。使用激光二极管光源(λ= 670 nm)的AFA成像在乳基散射溶液中以10 ^ 7:1的散射比(SR)解析153 µm的结构,并为±3.8 mm厚的鸡组织绘制204 µm的图案。显示了AFA隧道的碳沉积和NH4OH硅粗糙化可以减少背景散射光。较小的隧道几何形状和扫描步骤可提高图像分辨率。对具有孔径ADI空间滤波的镜头进行了研究,以验证分辨率与散射光抑制之间折衷的理论预测。 SF ADI用氩激光在SR = 1.4×10 ^ 7:1牛奶溶液中解析出102 µm的结构。

著录项

  • 作者

    Chan Paulman Konn Yan;

  • 作者单位
  • 年度 2008
  • 总页数
  • 原文格式 PDF
  • 正文语种 English
  • 中图分类

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