Methods to Minimize Optical Noise That Degrade Fluorescence Efficiency of Optical Probe for Near-Infrared Tracking in Surgical Environment

Hyeong Ju Park^1,2*, In Hee Shin¹, Jae Seok Park¹, Joo Beom Eom¹, Seok-Ki Kim³, Byeong-Il Lee¹

¹Medical Photonics Research Center, Korea Photonics Technology Institute, Gwangju, South Korea.
²Interdisciplinary Program of Biomedical Engineering, Chonnam National University, Gwangju, South Korea.
³Department of Nuclear Medicine, National Cancer Center, Goyang, South Korea.

DOI: 10.4236/jbise.2015.81006                

Abstract

In the medical field, there are growing interests in applied research such as in vivo fluorescence monitoring because of excellent body transmission characteristic of the near-infrared light. However, optical noise by excitation light and illumination equipment for medical applications such as interior light, surgical light decrease efficiency of the fluorescent signal when observers such as surgeons confirm fluorescence signals in medical field. To solve these problems in medical field, we have analyzed external noise factors by effect on image realization, quantification of optical noise generation by external factors, and have suggested methods of minimize the optical noise in this paper. In case of fluorescence imaging in the operating room, it has been confirmed that fluorescent excitation light, interior light and surgical light are factors to generate optical noise. To acquire near-infrared fluorescence images and to compare fluorescence contrast under conditions of darkroom, interior light and surgical light, light emitting diodes (LEDs) sources that have peak wavelength at 740, 760 and 780 nm respectively were used as excitation light sources. In addition, short-pass filter which has transmission edge at 775 nm has been applied to minimize the optical noise in each external noise factor. By comparing contrast of each image before and after use of the short-pass filter, we confirmed that optical noise reduced 49%, 56% and 66% in external noise factors respectively.

Keywords

Near-Infrared, Fluorescence, Optical Noise, Filtering

Conflicts of Interest

The authors declare no conflicts of interest.

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