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Updated: May 21, 2026

Continuous-wave Thulium Laser for Heating Cultured Cells to Investigate Cellular Thermal Effects
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Automatic temperature controlled retinal photocoagulation.

Kerstin Schlott1, Stefan Koinzer, Lars Ptaszynski

  • 1University of Lübeck, Institute of Biomedical Optics, Peter-Monnik-Weg 4, D-23562, Lübeck, Germany. schlott@bmo.uni-luebeck

Journal of Biomedical Optics
|June 28, 2012
PubMed
Summary
This summary is machine-generated.

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This study developed an automatic feedback algorithm to control laser coagulation for retinal diseases. The system uses optoacoustics to monitor retinal temperature, ensuring consistent lesion strengths regardless of pigmentation.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Laser Medicine

Background:

  • Laser coagulation is a key treatment for retinal diseases.
  • Variations in fundus pigmentation and light scattering lead to inconsistent lesion strengths.
  • Precise control over lesion strength is crucial for effective treatment outcomes.

Purpose of the Study:

  • To develop an automatic feedback algorithm for laser coagulation.
  • To control retinal temperature increase via irradiation time for desired lesion strengths.
  • To achieve consistent and predictable lesion sizes in retinal photocoagulation.

Main Methods:

  • Utilized optoacoustics for non-invasive retinal temperature monitoring during laser treatment.
  • Employed a Q-switched Nd:YLF laser for temperature-dependent pressure amplitude excitation.

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Published on: January 22, 2018

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Last Updated: May 21, 2026

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  • Used a continuous wave Nd:YAG laser for photocoagulation and developed control algorithms.
  • Validated ED50 temperatures and extracted Arrhenius parameters for lesion formation kinetics.

    • Main Results:

    • Developed control algorithms for mild and strong lesions, achieving average diameters of 162 ± 34 μm and 189 ± 34 μm, respectively.
    • Demonstrated that automatically controlled lesion sizes were largely independent of treatment laser power and retinal pigmentation.
    • Identified ED50 temperatures varying with irradiation time (e.g., 63°C for 20 ms, 49°C for 400 ms).

    Conclusions:

    • An automatic feedback system can reliably control laser coagulation lesion strengths.
    • Optoacoustic monitoring enables precise temperature control for consistent retinal treatments.
    • This approach offers improved predictability and independence from confounding factors like pigmentation.