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arXiv 1208.5264physics.opticsphysics.bio-phphysics.ins-detphysics.med-ph
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通过迭代声光相互作用打破深部组织显微镜的空间分辨率障碍

Breaking the spatial resolution barrier via iterative sound-light interaction in deep tissue microscopy

Ke Si, Reto Fiolka, Meng Cui

摘要:

迄今为止,光学显微镜仅限于表面层,留下许多重要的生物学问题没有答案。随机散射导致通常用于图像形成的弹道聚焦随深度呈指数衰减。通过将光与声波的更深穿透能力相结合的混合技术,已经证明了超出弹道范围的光学成像。在高散射介质的深处,声聚焦尺寸限制了成像分辨率。在这里,我们表明,通过相位共轭迭代地将光聚焦到超声焦点中,我们可以从根本上克服深层组织中的分辨率障碍,同时增加焦点与背景的比率。我们展示了荧光显微镜超越弹道制度的光与三倍的分辨率提高和对比度增加五倍。这一发展开辟了在深层组织中的实用高分辨率荧光成像。

英文摘要:

Optical microscopy has so far been restricted to superficial layers, leaving many important biological questions unanswered. Random scattering causes the ballistic focus, which is conventionally used for image formation, to decay exponentially with depth. Optical imaging beyond the ballistic regime has been demonstrated by hybrid techniques that combine light with the deeper penetration capability of sound waves. Deep inside highly scattering media, the sound focus dimensions restrict the imaging resolutions. Here we show that by iteratively focusing light into an ultrasound focus via phase conjugation, we can fundamentally overcome this resolution barrier in deep tissues and at the same time increase the focus to background ratio. We demonstrate fluorescence microscopy beyond the ballistic regime of light with a threefold improved resolution and a fivefold increase in contrast. This development opens up practical high resolution fluorescence imaging in deep tissues.

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