Special Section on Hard-Tissue Optics and Related Methods

Thermophotonic lock-in imaging of early demineralized and carious lesions in human teeth

[+] Author Affiliations
Nima Tabatabaei, Andreas Mandelis

University of Toronto, Department of Mechanical and Industrial Engineering, Center for Advanced Diffusion-Wave Technologies, 5 King's College Road, Toronto, Ontario, M5S 3G8, Toronto, Canada

Bennett Tochukwu Amaechi

University of Texas Health Science Center at San Antonio, Department of Community Dentistry, San Antonio, Texas 78229-3900

J. Biomed. Opt. 16(7), 071402 (July 01, 2011). doi:10.1117/1.3564890
History: Received July 01, 2010; Revised August 21, 2010; Accepted August 23, 2010; Published July 01, 2011; Online July 01, 2011
Text Size: A A A

As an extension of frequency-domain photothermal radiometry, a novel dental-imaging modality, thermophotonic lock-in imaging (TPLI), is introduced. This methodology uses photothermal wave principles and is capable of detecting early carious lesions and cracks on occlusal and approximal surfaces as well as early caries induced by artificial demineralizing solutions. The increased light scattering and absorption within early carious lesions increases the thermal-wave amplitude and shifts the thermal-wave centroid, producing contrast between the carious lesion and the intact enamel in both amplitude and phase images. Samples with artificial and natural occlusal and approximal caries were examined in this study. Thermophotonic effective detection depth is controlled by the modulation frequency according to the well-known concept of thermal diffusion length. TPLI phase images are emissivity normalized and therefore insensitive to the presence of stains. Amplitude images, on the other hand, provide integrated information from deeper enamel regions. It is concluded that the results of our noninvasive, noncontacting imaging methodology exhibit higher sensitivity to very early demineralization than dental radiographs and are in agreement with the destructive transverse microradiography mineral density profiles.

Figures in this Article
© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Nima Tabatabaei ; Andreas Mandelis and Bennett Tochukwu Amaechi
"Thermophotonic lock-in imaging of early demineralized and carious lesions in human teeth", J. Biomed. Opt. 16(7), 071402 (July 01, 2011). ; http://dx.doi.org/10.1117/1.3564890


Tables

Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

PubMed Articles
Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.