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Real-time temperature determination during retinal photocoagulation on patients
Ralf Brinkmann1, Stefan Koinzer, Kerstin Schlott
1University of Lübeck, Institute of Biomedical Optics, Lübeck, Germany. brinkmann@bmo.uni-luebeck.de
Journal of Biomedical Optics
|June 28, 2012
Summary
This study introduces an optoacoustic method for real-time temperature monitoring during retinal photocoagulation. This technique enables precise control of laser treatment, minimizing patient pain and retinal damage.
Area of Science:
- Ophthalmology
- Biomedical Optics
- Medical Physics
Background:
- Retinal photocoagulation's thermal damage is difficult to control due to intraocular variations.
- Current methods risk overtreatment, causing neuroretinal damage and pain.
Purpose of the Study:
- To develop and validate an optoacoustic (OA) method for real-time temperature monitoring during retinal photocoagulation.
- To enable feedback-controlled laser treatment for precise coagulation strength.
Main Methods:
- Utilized repetitive nanosecond probe laser pulses to generate thermoelastic pressure transients.
- Detected temperature-dependent pressure amplitudes non-invasively via an ultrasonic transducer in a contact lens.
- Correlated OA measurements with heat diffusion theory predictions.
Main Results:
- Observed temperature courses consistent with heat diffusion theory during clinical treatments.
- Measured peak temperatures between 70°C and 85°C for mild coagulations with specific laser parameters.
- Demonstrated the feasibility of real-time temperature monitoring.
Conclusions:
- The optoacoustic method offers a promising approach for precise, real-time temperature monitoring in retinal photocoagulation.
- This technology can lead to feedback-controlled treatments, improving safety and patient outcomes.
- Minimizes adverse effects and pain by enabling reproducible and accurate laser dosage.
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01:19Assessing Body Temperature - Temporal Artery
Here is a stepwise guide to assessing the body temperature at the temporal artery using a temporal artery thermometer
Step 1: Perform hand hygiene and don a fresh pair of gloves to prevent cross-infection and ensure patient safety.
Step 2: Explain the procedure to the patient to establish trust. Clear communication establishes trust with the patient, ensures they understand what to expect, promotes cooperation, and enhances comfort during the procedure.
Step 3: Assess the patient's forehead...
Step 1: Perform hand hygiene and don a fresh pair of gloves to prevent cross-infection and ensure patient safety.
Step 2: Explain the procedure to the patient to establish trust. Clear communication establishes trust with the patient, ensures they understand what to expect, promotes cooperation, and enhances comfort during the procedure.
Step 3: Assess the patient's forehead...
01:14Temperature Measurement Sites
A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
01:13Equipments Used to Measure Body Temperature
Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...