Investigations on thermography in laser medicine

Christian Freymüller; Maximilian Eisel; Stephan Ströbl; Adrian Rühm; Ronald Sroka

doi:10.1117/12.2527128

22 July 2019 Investigations on thermography in laser medicine

Christian Freymüller, Maximilian Eisel, Stephan Ströbl, Adrian Rühm, Ronald Sroka

Author Affiliations +

Proceedings Volume 11079, Medical Laser Applications and Laser-Tissue Interactions IX; 1107909 (2019) https://doi.org/10.1117/12.2527128
Event: European Conferences on Biomedical Optics, 2019, Munich, Germany

Abstract

Thermography is used in many application areas like non-destructive testing, architecture or zoology. Approaches to use thermography for medical diagnostics are usually focused on the detection of tumors. The usefulness and specificity for this purpose has been debated. Nevertheless it seems reasonable to evaluate the applicability of thermography as a tool for determining temperature distributions on the surface of, e.g., light diffusers or biological tissue in the field of laser medicine. The assessment of tissue-heating in treatments like interstitial photodynamic therapy (iPDT) is of particular interest since additional tissue damage due to tissue heating is usually undesired and has thus to be avoided. Monte Carlo based simulations of the expected heat distribution in tissue are based on idealized setups. They usually omit certain characteristics of fibers, like inhomogeneities in a light diffuser or losses at components such as internal mirrors, that might potentially result in local hot spots and therefore in heating beyond an acceptable temperature. Experimental techniques based on thermocouples, or similar point-based temperature measurement devices, provide only a limited view of the temperature distribution inside or at the surface of the treated tissue. As a high resolution non-contact wide-field technique thermography although has some limitations. We present an evaluation of the usefulness of thermographic methods for recording the heat distribution on tissue and tissue phantom surfaces during laser treatment in an iPDT-like setup and compare the results with Monte Carlo based simulations.

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Christian Freymüller, Maximilian Eisel, Stephan Ströbl, Adrian Rühm, and Ronald Sroka "Investigations on thermography in laser medicine", Proc. SPIE 11079, Medical Laser Applications and Laser-Tissue Interactions IX, 1107909 (22 July 2019); https://doi.org/10.1117/12.2527128

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KEYWORDS

Diffusers

Thermography

Tissues

Monte Carlo methods

Tissue optics

Laser therapeutics

Laser tissue interaction

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