A non-contact temperature measurement system for controlling photothermal medical laser treatments

Kaya, Özgür; Gülsoy, Murat

doi:10.1117/12.2212254

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…During HLL therapy, laser energy is transmitted and absorbed by adipocyte cells, leading to increased temperature of subcutaneous adipose tissue. Therefore, various thermal effects can be triggered, including hyperthermia (45 °C), coagulation (60 °C), and decomposition (thermal ablation) (100 °C) 7 . Tissue damages linearly depend on the heating time and exponentially on the temperature increase 8 , hence the effectiveness of the treatment heavily rely on the ability to closely monitor and field of the tissue 9 .…”

Section: Introductionmentioning

confidence: 99%

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Non-contact monitoring of the depth temperature profile for medical laser scanning technologies

Kosir

Vella

Jezeršek

2020

Sci Rep

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Medical treatments such as high-intensity focused ultrasound, hyperthermic laser lipolysis or radiofrequency are employed as a minimally invasive alternatives for targeted tissue therapies. The increased temperature of the tissue triggers various thermal effects and leads to an unavoidable damage. As targeted tissues are generally located below the surface, various approaches are utilized to prevent skin layers from overheating and irreparable thermal damages. These procedures are often accompanied by cooling systems and protective layers accounting for a non-trivial detection of the subsurface temperature peak. Here, we show a temperature peak estimation method based on infrared thermography recording of the surface temperature evolution coupled with a thermal-diffusion-based model and a time-dependent data matching algorithm. The performance of the newly developed method was further showcased by employing hyperthermic laser lipolysis on an ex-vivo porcine fat tissue. Deviations of the estimated peak temperature remained below 1 °C, as validated by simultaneous measurement of depth temperature field within the tissue. Reconstruction of the depth profile shows a good reproducibility of the real temperature distribution with a small deviation of the peak temperature position. A thermal camera in combination with the time-dependent matching bears the scope for non-contact monitoring of the depth temperature profile as fast as 30 s. The latest demand for miniaturization of thermal cameras provides the possibility to embed the model in portable thermal scanners or medical laser technologies for improving safety and efficiency.

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Section: Introductionmentioning

confidence: 99%

“…Active control of surface temperature with a closed-loop control system was already demonstrated by utilizing a low spatial resolution infrared sensor for a laser system modulation 7 , 13 . The system is applicable to laser tissue welding, where peak temperature is located at the tissue surface.…”

Section: Introductionmentioning

confidence: 99%

Non-contact monitoring of the depth temperature profile for medical laser scanning technologies

Kosir

Vella

Jezeršek

2020

Sci Rep

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A novel method to estimate temperature depth profile using thermography

Kosir

Vella

Jezeršek

2021

Translational Biophotonics: Diagnostics and Therapeutics

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Controlling Laser Irradiation with Tissue Temperature Feedback Enhances Photothermal Applications: Ex-Vivo Evaluation on Bovine Liver

et al. 2022

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Achieving repeatable and successful results without causing excessive collateral damage is of paramount importance for photothermal laser applications. Predetermined laser parameters cannot ensure patient safety and treatment success due to variance between optical and thermal characteristics among subjects. Controlling laser irradiation with tissue temperature feedback is the current gold standard for various photothermal treatments (PTT) which are rate processes described by the Arrhenius temperature integral. This study establishes the validity of our low-cost design that makes tissue surface temperature control during photothermal laser applications more accessible in resource limited clinical environments. We demonstrated the practical performance and potential of our system with ex-vivo bovine liver irradiation using an ytterbium fiber laser (λ=1071nm) with two independent variables: laser power (3.4, 6.8 and 10.2W) and target surface temperature (55, 65 and 75∘C). Our system efficiently maintained tissue surface temperatures at target values in all laser power groups. In contrast, fixed-dose application groups displayed a high final temperature range and variation in the control experiment. Temperature–time responses of samples varied significantly, in agreement with a wide range of optical and thermal coefficients. Long exposure duration groups (lower power, higher target temperature) displayed more radical differences suggesting a dominance of optical and thermal characteristics over the response. The low-cost surface-temperature-controlled medical laser system we have developed is capable of ensuring the success and reproducibility of PTT modalities and patient safety.

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A non-contact temperature measurement system for controlling photothermal medical laser treatments

Cited by 3 publications

References 22 publications

Non-contact monitoring of the depth temperature profile for medical laser scanning technologies

Non-contact monitoring of the depth temperature profile for medical laser scanning technologies

A novel method to estimate temperature depth profile using thermography

Controlling Laser Irradiation with Tissue Temperature Feedback Enhances Photothermal Applications: Ex-Vivo Evaluation on Bovine Liver

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