Dental Imaging With Near-Infrared Transillumination Using Random Fiber Laser
- PDF / 707,117 Bytes
- 7 Pages / 595.22 x 842 pts (A4) Page_size
- 71 Downloads / 205 Views
Dental Imaging With Near-Infrared Transillumination Using Random Fiber Laser Jiayu GUO, Yunjiang RAO, Weili ZHANG*, Zewen CUI, Anran LIU, and Yongmei YAN Key Laboratory of Optical Fiber Sensing & Communications (Ministry of Education), University of Electronic Science and Technology of China, Chengdu 611731, China *
Corresponding author: Weili ZHANG
E-mail: [email protected]
Abstract: Contrary to the conventional detection method like radiography, the near infrared light source has been demonstrated to be suitable for dental imaging due to different reflectivity among enamel, dentin, and caries lesion. In this paper, three light sources with different bandwidths based on a transillumination method are compared. The contrast among enamel, dentin, and caries lesion is calculated in different situations. The experimental results show that the random fiber laser has the best comprehensive quality in dental imaging due to its high spectral density, low coherence, and deep penetration. This work provides a guidance for light source selection in dental imaging. Keywords: Random fiber laser; near infrared; dental imaging; caries detection Citation: Jiayu GUO, Yunjiang RAO, Weili ZHANG, Zewen CUI, Anran LIU, and Yongmei YAN, “Dental Imaging With Near-Infrared Transillumination Using Random Fiber Laser,” Photonic Sensors, DOI: 10.1007/s13320-020-0582-5.
1. Introduction Dental caries is the most common oral disease, and the conventional dental detection methods are mainly visual inspection and radiography. Clearly visible caries can be detected by visual inspection and dental probe, while those hidden and inaccessible lesions mainly rely on dental radiography. However, these methods could underestimate or even miss the depth or size of the lesions if caries is at an early stage [1]. Near-infrared (NIR) transillumination (TI), a nonionizing imaging method with high sensitivity and easy operation has been investigated and demonstrated to be a promising technology to fill this gap [2–11]. The principle of TI is based on the difference in scattering and absorption of NIR light depending on
the degree of demineralization. The dental caries caused mineral loss increases the scattering coefficient, thus appearing as the dark region in image [12]. The scattering coefficient of enamel in the visible is more than 20 times higher than that in NIR, which gives NIR a high contrast of demineralization. The investigation into NIR light for dental imaging has been concentrated on its wavelength. The wavelength from 400 nm to 2350 nm has been measured to compare the contrast of caries lesion and healthy enamel, and the result shows that wavelength beyond 1400 nm performs better [13]. Kenneth H. Chan et al. had the similar conclusion, and the reduced light scattering coefficient beyond 1300 nm was the main reason for the higher lesion contrast at the longer NIR wavelengths [14]. Although the wavelength of the
Received: 11 November 2019 / Revised: 25 February 2020 © The Author(s) 2020. This article is published with open access at Spr
Data Loading...
