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A 5mm catheter for constant resolution probing in Fourier domain optical coherence endoscopy

机译:5毫米导管,用于在傅里叶域光学相干内窥镜中进行恒定分辨率的探测

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摘要

A 5mm biophotonic catheter was conceived for optical coherence tomography (OCT) with collimation optics, an axicon lens, and custom design imaging optics, yielding a 360 degree scan aimed at imaging within concave structures such as lung lobes. In OCT a large depth of focus is necessary to image a thick sample with a constant high transverse resolution. There are two approaches to achieving constant lateral resolution in OCT: Dynamic focusing or Bessel beam forming. This paper focuses on imaging with Bessel beams. A Bessel beam can be generated in the sample arm of the OCT interferometer when axicon optics is employed instead of a conventional focusing lens. We present a design for a 5mm catheter that combines an axicon lens with imaging optics and the coupling of a MEMS mirror attached to a micromotor that allow 360 degree scanning with a resolution of about 5 microns across a depth of focus of about 1.2mm.
机译:设想了一个5毫米生物光子导管,用于通过准直光学器件,轴锥透镜和定制设计成像光学器件进行光学相干断层扫描(OCT),从而产生旨在对凹结构(例如肺叶)成像的360度扫描。在OCT中,需要大焦深才能对具有恒定高横向分辨率的厚样品成像。有两种方法可以在OCT中获得恒定的横向分辨率:动态聚焦或Bessel波束形成。本文着重于用贝塞尔光束成像。当使用轴锥光学代替传统的聚焦透镜时,OCT干涉仪的样品臂中会产生贝塞尔光束。我们提出了一种5mm导管的设计,该导管结合了轴锥透镜和成像光学元件以及MEMS镜与微电机的结合,该微镜允许在约1.2mm的焦深范围内进行360度扫描,分辨率约为5微米。

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