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Fundus reflectometry for photocoagulation dosimetry.

K P Pflibsen, F C Delori, O Pomerantzeff

|June 16, 2010

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A new dosimetry technique using fundus reflectometry significantly reduces variability in photocoagulation lesion size. This method improves control over laser treatments by accounting for ocular tissue optical properties and thermal damage, enhancing treatment precision.

Area of Science:

Ophthalmology
Biomedical Optics
Medical Physics

Background:

Photocoagulation is a crucial ophthalmic procedure, but lesion size variability poses challenges.
Variability stems from factors like choroidal blood/melanin and retinal pigment epithelium (RPE) melanin concentration.
Precise control of lesion size is essential for effective and safe treatment outcomes.

Purpose of the Study:

To develop and validate a dosimetry technique for controlling photocoagulation lesion size.
To quantify the reduction in lesion size variability using the developed dosimetry method.
To improve the predictability and consistency of ophthalmic laser treatments.

Main Methods:

Utilized three-wavelength fundus reflectometry and a quantitative fundus reflectance model.

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Incorporated a thermal tissue damage model to guide photocoagulation.

Modeled ocular media, RPE, choriocapillaris, and choroid optical properties using established laws (Lambert-Beer, Kubelka-Munk).

Accounted for optical reflections from key ocular layers.

Main Results:

The dosimetry technique significantly reduced the coefficient of variation for red light photocoagulation lesion size from 45% (control) to 10% (dosimetry).
Similar improvements in lesion size consistency were observed for yellow photocoagulation light.
Identified variations in choroidal blood, melanin, and RPE melanin as sources of lesion size variability.

Conclusions:

The developed dosimetry technique effectively controls photocoagulation lesion size, enhancing treatment precision.
This approach offers a significant improvement in the consistency of ophthalmic laser treatments.
The findings support the clinical application of advanced dosimetry for improved patient outcomes.