Simple Characterization of Cylindrical Diffuser Fibers With a Fluorescent Layer

IF 2.2 3区医学 Q2 DERMATOLOGY Lasers in Surgery and Medicine Pub Date : 2024-06-25 DOI:10.1002/lsm.23821

Herbert Stepp, Ronald Sroka

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引用次数: 0

Abstract

Objectives

A fast, simple, versatile, and reliable method to record light emission intensity profiles of cylindrical light diffusers (CDFs) in air and transparent liquids has been developed.

Methods

A fluorescent color glass filter (RG695) converts red light emitted by a cylindrical diffuser fiber into near-infrared light in an emission angle-independent manner. The red light was provided from a diode laser system at 635 nm. Near-infrared fluorescence from the RG695 was imaged with a camera. Images from this camera were processed to obtain emission intensity profiles. Cylindrical diffuser fiber profiles of four different manufacturers were compared.

Results

The proposed method provides angle-independent intensity profiles of cylindrical diffuser fibers with a single camera shot. It could be demonstrated that dependent on the underlying principle of how the diffuser fiber tips emit light, the emission profile can change significantly in media with different refractive indices.

Conclusions

By converting the light emitted by a diffuser fiber tip into fluorescence light one can eliminate the dependence of the recorded profile on the emission angle from the diffusor. This approach allows for easily taking into account refraction-index (mis)matching by placing the equipment into a suitable liquid. The proposed measurement principle bears potential for quality assurance measurements of CDFs used for interstitial laser thermotherapy or photodynamic therapy.

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带有荧光层的圆柱形扩散纤维的简单表征。

目标：开发出一种快速、简单、通用且可靠的方法，用于记录空气和透明液体中圆柱形光扩散器（CDF）的发光强度曲线：开发了一种快速、简单、通用且可靠的方法，用于记录空气和透明液体中圆柱形光扩散器（CDF）的光发射强度曲线：方法：荧光彩色玻璃滤光片（RG695）以与发射角无关的方式将圆柱形光扩散纤维发出的红光转换成近红外线。红光由波长为 635 nm 的二极管激光系统提供。RG695 发出的近红外荧光通过照相机成像。对相机拍摄的图像进行处理，以获得发射强度曲线。对四家不同制造商的圆柱形扩散器光纤轮廓进行了比较：结果：所提出的方法只需一次相机拍摄，就能获得与角度无关的圆柱形扩散器光纤的强度曲线。可以证明，根据扩散器光纤尖端如何发射光线的基本原理，在不同折射率的介质中，发射轮廓会发生显著变化：通过将扩散器光纤尖端发射的光转换为荧光，可以消除记录的轮廓对扩散器发射角的依赖。这种方法可以通过将设备放入适当的液体中，轻松考虑折射率（误）匹配。所提出的测量原理可用于间质激光热疗或光动力疗法中 CDF 的质量保证测量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Lasers in Surgery and Medicine 医学-外科

CiteScore

5.40

自引率

12.50%

发文量

119

审稿时长

1 months

期刊介绍： Lasers in Surgery and Medicine publishes the highest quality research and clinical manuscripts in areas relating to the use of lasers in medicine and biology. The journal publishes basic and clinical studies on the therapeutic and diagnostic use of lasers in all the surgical and medical specialties. Contributions regarding clinical trials, new therapeutic techniques or instrumentation, laser biophysics and bioengineering, photobiology and photochemistry, outcomes research, cost-effectiveness, and other aspects of biomedicine are welcome. Using a process of rigorous yet rapid review of submitted manuscripts, findings of high scientific and medical interest are published with a minimum delay.