arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1803.01151physics.opticsphysics.bio-ph
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部分相干照明下最佳频率组合的三维光学衍射层析显微术

Three-dimensional optical diffraction tomographic microscopy with optimal frequency combination with partially coherent illuminations

Jiaji Li, Qian Chen Jiasong Sun, Jialin Zhang, Junyi Ding, Chao Zuo

摘要:

我们展示了一个三维(3D)光学衍射层析技术与最佳频率组合(OFC-ODT)的三维定量相位成像的未标记的标本。在一个环形孔径和两个圆形孔径下,利用不同的相干参数,分别拍摄了三组离焦光强图像。将对应于不同照明孔径的3D相位光学传递函数(POTF)相结合以获得最佳合成的频率响应,从而实现高质量、低噪声的3D重建,其成像分辨率高达非相干衍射极限。此外,还对环形照明的三维成像性能进行了研究,推导并分析了任意照明光瞳下的三维POTF表达式。结果表明,通过引入一个互补环形光阑,可以有效地解决高数值孔径条件下的相衬冲刷效应,从而大大提高了相衬度,提高了实际成像分辨率。为了测试所提出的OFC-ODT技术的可行性,三维折射率重建结果的基础上,一个模拟的三维分辨率的目标和实验研究的微聚苯乙烯珠和未染色的生物样品。由于其高分辨率的3D相位成像能力以及与广泛使用的商业显微镜的兼容性,OFC-ODT有望在生物和生物医学研究中找到多方面的应用。

英文摘要:

We demonstrate a three-dimensional (3D) optical diffraction tomographic technique with optimal frequency combination (OFC-ODT) for the 3D quantitative phase imaging of unlabeled specimens. Three sets of through-focus intensity images are captured under an annular aperture and two circular apertures with different coherence parameters. The 3D phase optical transfer functions (POTF) corresponding to different illumination apertures are combined to obtain an optimally synthesized frequency response, achieving high-quality, low-noise 3D reconstructions with imaging resolution up to the incoherent diffraction limit. Besides, the 3D imaging performance of annular illumination is explored and the expression of 3D POTF for arbitrary illumination pupils is derived and analyzed. It is shown that the phase-contrast washout effect in high-NA circular apertures can be effectively addressed by introducing a complementary annular aperture, which strongly boosts the phase contrast and improves the practical imaging resolution. To test the feasibility of the proposed OFC-ODT technique, the 3D refractive index reconstruction results based on a simulated 3D resolution target and experimental investigations of micro polystyrene bead and unstained biological samples are presented. Due to its capability of high-resolution 3D phase imaging as well as the compatibility with widely available commercial microscope, the OFC-ODT is expected to find versatile applications in biological and biomedical research.

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