Volume 9, Issue 3 pp. 270-275
Full Article

Imaging of subchondral bone by optical coherence tomography upon optical clearing of articular cartilage

Alexander Bykov

Corresponding Author

Alexander Bykov

Optoelectronics and Measurement Techniques Laboratory, University of Oulu, P.O. Box 4500, 90014 Oulu, Finland

ITMO University, 49 Kronverksky pr., Saint-Petersburg, 197101 Russia

Interdisciplinary Laboratory of Biophotonics, Tomsk State University, Tomsk, 634050 Russia

Corresponding author: e-mail: [email protected]

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Tapio Hautala

Tapio Hautala

Optoelectronics and Measurement Techniques Laboratory, University of Oulu, P.O. Box 4500, 90014 Oulu, Finland

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Matti Kinnunen

Matti Kinnunen

Optoelectronics and Measurement Techniques Laboratory, University of Oulu, P.O. Box 4500, 90014 Oulu, Finland

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Alexey Popov

Alexey Popov

Optoelectronics and Measurement Techniques Laboratory, University of Oulu, P.O. Box 4500, 90014 Oulu, Finland

ITMO University, 49 Kronverksky pr., Saint-Petersburg, 197101 Russia

Interdisciplinary Laboratory of Biophotonics, Tomsk State University, Tomsk, 634050 Russia

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Sakari Karhula

Sakari Karhula

Department of Medical Technology, Institute of Biomedicine, University of Oulu, P.O. Box 5000, 90014 Oulu, Finland

Medical Research Center, University of Oulu and Oulu University Hospital, P.O. Box 50, 90029 Oulu, Finland

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Simo Saarakkala

Simo Saarakkala

Department of Medical Technology, Institute of Biomedicine, University of Oulu, P.O. Box 5000, 90014 Oulu, Finland

Medical Research Center, University of Oulu and Oulu University Hospital, P.O. Box 50, 90029 Oulu, Finland

Department of Diagnostic Radiology, Oulu University Hospital, P.O. Box 50, 90029 Oulu, Finland

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Miika T. Nieminen

Miika T. Nieminen

Medical Research Center, University of Oulu and Oulu University Hospital, P.O. Box 50, 90029 Oulu, Finland

Department of Diagnostic Radiology, Oulu University Hospital, P.O. Box 50, 90029 Oulu, Finland

Department of Radiology, University of Oulu, P.O. Box 5000, 90014 Oulu, Finland

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Valery Tuchin

Valery Tuchin

Optoelectronics and Measurement Techniques Laboratory, University of Oulu, P.O. Box 4500, 90014 Oulu, Finland

Research-Educational Institute of Optics and Biophotonics, Saratov State University, 410012 Saratov, Russia

Institute of Precise Mechanics and Control of Russian Academy of Sciences, Russian Academy of Sciences, 410028 Saratov, Russia

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Igor Meglinski

Igor Meglinski

Optoelectronics and Measurement Techniques Laboratory, University of Oulu, P.O. Box 4500, 90014 Oulu, Finland

ITMO University, 49 Kronverksky pr., Saint-Petersburg, 197101 Russia

Interdisciplinary Laboratory of Biophotonics, Tomsk State University, Tomsk, 634050 Russia

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First published: 22 June 2015
Citations: 36

Abstract

Optical clearing is an effective method to reduce light scattering of biological tissues that provides significant enhancement of light penetration into the biological tissues making non-invasive diagnosis more feasible. In current report Optical Coherence Tomography (OCT) in conjunction with optical clearing is applied for assessment of deep cartilage layers and cartilage-bone interface. The solution of Iohexol in water has been used as an optical clearing agent. The cartilage-bone boundary becomes visible after 15 min of optical clearing that enabling non-invasive estimation of its roughness: Sa = 10 ± 1 µm. The results show that for 0.9 mm thick cartilage optical clearing is stopped after 50 min with an increase of refractive index from 1.386 ± 0.008 to 1.510 ± 0.009. Current approach enables more reliable detection of arthroscopically inaccessible regions, including cartilage-bone boundary and subchondral bone, and potentially improves accuracy of the osteoarthritis diagnosis.

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