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Assessment of cartilage thickness utilising reflectance spectroscopy
Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Physiological Measurements.
Linköping University, Faculty of Health Sciences. Linköping University, Department of Molecular and Clinical Medicine, Medical Microbiology.
Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Physiological Measurements.
2004 (English)In: Medical and Biological Engineering and Computing, ISSN 0140-0118, E-ISSN 1741-0444, Vol. 42, no 1Article in journal (Refereed) Published
Abstract [en]

A new principle for cartilage layer thickness assessments in joints is presented. It is based on the differences between the absorption spectra of cartilage and subchondral bone (containing blood). High-resolution ultrasound measurements of cartilage thickness were compared with reflection spectroscopy data from the same area of bovine hip joint condyles. A simple mathematical model allowed calculation of thickness and comparison with ultrasound data. The cartilage thickness was changed by being ground in short episodes. For thicker cartilage layers, a high degree of reflection in the 400-600nm wavelength interval was seen. For thinner cartilage layers, the characteristics of the spectra of blood and bone dominated those of cartilage. The mean (±SD) thickness of intact cartilage was 1.21± 0.30 mm (n = 30). In an exponential regression model, spectroscopic estimation of cartilage thickness showed a correlation coefficient of r= 0.69 (n = 182). For thinner cartilage layers (d<0.5mm), the mean model error was 0.19±0.17mm. Results from a bi-layer Monte Carlo simulation supported the assumption of an exponential relationship between spectroscopy data and reference ultrasound data. The conclusion is that optical reflection spectroscopy can be used for cartilage layer thickness assessment.

Place, publisher, year, edition, pages
2004. Vol. 42, no 1
Keyword [en]
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Medical and Health Sciences
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URN: urn:nbn:se:liu:diva-22157DOI: 10.1007/BF02351004Local ID: 1267OAI: oai:DiVA.org:liu-22157DiVA: diva2:242470
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2017-12-13

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Öberg, ÅkeSundqvist, TommyJohansson, Anders

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