Image Processing

Assessment of natural enamel lesions with optical coherence tomography in comparison with microfocus x-ray computed tomography

[+] Author Affiliations
Jorge Espigares, Hidenori Hamba, Yasushi Shimada, Masayuki Otsuki, Junji Tagami

Tokyo Medical and Dental University, Department of Restorative Sciences, Cariology and Operative Dentistry, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan

Alireza Sadr

University of Washington School of Dentistry, 1959 NE Pacific Street, Seattle, Washington 98195, United States

Tokyo Medical and Dental University, International Exchange Center, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan

Yasunori Sumi

National Center for Geriatrics and Gerontology, National Hospital for Geriatric Medicine, Department of Advanced Medicine, Division of Oral and Dental Surgery, 36-3, Gengo, Morioka, Obu, Aichi 474-8511, Japan

J. Med. Imag. 2(1), 014001 (Feb 11, 2015). doi:10.1117/1.JMI.2.1.014001
History: Received October 24, 2014; Accepted January 12, 2015
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Abstract.  A technology to characterize early enamel lesions is needed in dentistry. Optical coherence tomography (OCT) is a noninvasive method that provides high-resolution cross-sectional images. The aim of this study is to compare OCT with microfocus x-ray computed tomography (μCT) for assessment of natural enamel lesions in vitro. Ten human teeth with visible white spot-like changes on the enamel smooth surface and no cavitation (ICDAS code 2) were subjected to imaging by μCT (SMX-100CT, Shimadzu) and 1300-nm swept-source OCT (Dental SS-OCT, Panasonic Health Care). In μCT, the lesions appeared as radiolucent dark areas, while in SS-OCT, they appeared as areas of increased signal intensity beneath the surface. An SS-OCT attenuation coefficient based on Beer–Lambert law could discriminate lesions from sound enamel. Lesion depth ranged from 175 to 606μm in SS-OCT. A correlation between μCT and SS-OCT was found regarding lesion depth (R=0.81, p<0.001) and also surface layer thickness (R=0.76, p<0.005). The images obtained clinically in real time using the dental SS-OCT system are suitable for the assessment of natural subsurface lesions and their surface layer, providing comparable images to a laboratory high-resolution μCT without the use of x-ray.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Jorge Espigares ; Alireza Sadr ; Hidenori Hamba ; Yasushi Shimada ; Masayuki Otsuki, et al.
"Assessment of natural enamel lesions with optical coherence tomography in comparison with microfocus x-ray computed tomography", J. Med. Imag. 2(1), 014001 (Feb 11, 2015). ; http://dx.doi.org/10.1117/1.JMI.2.1.014001


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