29 December 1998 Dosimetric analysis for low-level laser therapy (LLLT) of the human inner ear at 593 nm and 633 nm
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Abstract
The administration of low-level-laserlight for irradiation of the inner ear could represented a new therapeutic model for complex diseases of the inner ear. However, successful therapy requires a well-defined light dosimetry based on a dosimetric analysis of the human cochlea that represents a complex anatomy. The light distribution inside the cochlear windings, produced by an irradiation of the tympanic membrane, was quantitatively measured ex vivo for HeNe laser wavelengths of 593 nm and 633 nm. To obtain the space irradiance within an intact cochlea a correction factor of about 6 has been determined by Monte Carlo calculations. It follows from 3 contributions, first the backscattering of light in the bony parts removed during the preparation procedure of the specimen, second the change of index of refraction from the bony parts to air and third some geometrical factors due to the angular distribution of the radiation. The transmission of light across the tympanic cavity and the promontory depends strongly on the wavelength. Due to the observed spatial intensity variations of a factor 10 and more inside the cochlear windings the optimum external light dose has to be chosen with regard to the tonotopy of the ear.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wolfgang Beyer, Reinhold Baumgartner, Stefan Tauber, "Dosimetric analysis for low-level laser therapy (LLLT) of the human inner ear at 593 nm and 633 nm", Proc. SPIE 3569, Effects of Low-Power Light on Biological Systems IV, (29 December 1998); doi: 10.1117/12.334384; https://doi.org/10.1117/12.334384
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