Research Papers: Imaging

Near-infrared transillumination of teeth: measurement of a system performance

[+] Author Affiliations
Lena Karlsson

Karolinska Institutet, Department of Dental Medicine, P.O. Box 4064, SE-141 04 Huddinge, Sweden

Ana M. A. Maia

Universidade Federal of Pernambuco, Center for Health Science, Graduate Program in Odontology, Recife, Brazil

Bernardo B. C. Kyotoku

Universidade Federal of Pernambuco, Department of Physics, Recife, 50670-910 Brazil

Sofia Tranæus

Karolinska Institutet, Department of Dental Medicine, P.O. Box 4064, SE-141 04 Huddinge, Sweden and Swedish Council on Technology Assessment in Health Care, Stockholm, Sweden

Anderson S. L. Gomes

Universidade Federal of Pernambuco, Center for Health Science, Graduate Program in Odontology and Department of Physics, Recife, 50670 Brazil

Walter Margulis

Acreo AB, Electrum 236, Stockholm, 16440 Sweden

J. Biomed. Opt. 15(3), 036001 (May 12, 2010). doi:10.1117/1.3427135
History: Received October 09, 2009; Revised February 15, 2010; Accepted March 09, 2010; Published May 12, 2010; Online May 12, 2010
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Transillumination (TI) of dental enamel with near-infrared light is a promising nonionizing imaging method for detection of early caries lesion. Increased mineral loss (caries lesion) leads to increased scattering and absorption. Caries thus appear as dark regions because less light reaches the detector. The aim of this work was to characterize the performance of a TI system from the resolution of acquired images using the modulation transfer function at two wavelengths, 1.28 and 1.4μm. Test charts with various values of spatial periods, mimicking a perfect caries lesion, were attached to tooth sections, followed by capture of the transmitted image, using both wavelengths. The sections were then consecutively reduced in thickness, and a sequence of all sizes of the test charts were used for repeatedly imaging procedures. The results show that the TI system can detect feature size of 250μm with 30% modulation. From the information about how the image degrades as it propagates through enamel, we also examined the possibility of estimating the position of a simulated approximal caries lesion by comparing images obtained from the two sides of a tooth section.

Figures in this Article
MicronViewer 7290A, Electrophysics, Fairfield, New Jersey

Citation

Lena Karlsson ; Ana M. A. Maia ; Bernardo B. C. Kyotoku ; Sofia Tranæus ; Anderson S. L. Gomes, et al.
"Near-infrared transillumination of teeth: measurement of a system performance", J. Biomed. Opt. 15(3), 036001 (May 12, 2010). ; http://dx.doi.org/10.1117/1.3427135


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