Dependence of Photothermal Responses on Wavelengths

Bak, Jinoh; Pyo, Han Jae; Choi, Jong Man; Jeong, Seok; Kang, Hyun Wook

doi:10.3938/jkps.74.224

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…In summary, in the visible light band (450–810 nm), the shorter the wavelength of the laser, the better it demonstrates the photothermal effect; however, in the infrared light band (980–1064 nm), it seems that the longer the wavelength, the better the photothermal effect. This photothermal effect law in laser–Pd/Cr metal film interactions is unexpectedly consistent with that in laser–biological tissue interactions [ 38 , 39 ]. For example, the photothermal effects of lasers with different wavelengths were reported in 2018, where 532 and 1470 nm induced higher temperatures for liver tissues than those induced by 808 and 980 nm [ 38 ].…”

Section: Discussionsupporting

confidence: 74%

“…This photothermal effect law in laser–Pd/Cr metal film interactions is unexpectedly consistent with that in laser–biological tissue interactions [ 38 , 39 ]. For example, the photothermal effects of lasers with different wavelengths were reported in 2018, where 532 and 1470 nm induced higher temperatures for liver tissues than those induced by 808 and 980 nm [ 38 ]. Interestingly, it is well known that the composition and morphology of biological tissue is quite different from metal film.…”

Section: Discussionsupporting

confidence: 74%

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A Micron-Sized Laser Photothermal Effect Evaluation System and Method

Zeng

et al. 2021

Sensors

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The photothermal effects of lasers have played an important role in both medical laser applications and the development of cochlear implants with optical stimulation. However, there are few methods to evaluate the thermal effect of micron-sized laser spots interacting with other tissues. Here, we present a multi-wavelength micro-scale laser thermal effect measuring system that has high temporal, spatial and temperature resolutions, and can quantitatively realize evaluations in real time. In this system, with accurate 3D positioning and flexible pulsed laser parameter adjustments, groups of temperature changes are systematically measured when the micron-sized laser spots from six kinds of wavelengths individually irradiate the Pd/Cr thermocouple junction area, and reference data of laser spot thermal effects are obtained. This work develops a stable, reliable and universal tool for quantitatively exploring the thermal effect of micron-sized lasers, and provides basic reference data for research on light-stimulated neuron excitement in the future.

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Section: Discussionsupporting

confidence: 74%

Section: Discussionsupporting

confidence: 74%

A Micron-Sized Laser Photothermal Effect Evaluation System and Method

Zeng

et al. 2021

Sensors

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“…However, a quantitative assessment of the thermal response induced in biological tissues by different combinations of laser wavelengths and GNR sizes, at the same setting parameters, could provide further insight into the development of an efficient photoablative strategy. Indeed, most of the studies in this field focus on the evaluation of the effectiveness of a specific nanoparticle-laser wavelength combination [27], employing a single laser emitter, or investigate the effect of laser-tissue interaction at different wavelengths only on ex vivo tissue or in vitro conditions [22,28]. In this way, important factors typical of the in vivo tissue characteristics are not adequately considered.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of laser irradiation-gold nanorod combinations at 808 nm, 940 nm, 975 nm and 1064 nm wavelengths in breast cancer model

Bianchi

Mooney

Cornejo

et al. 2021

International Journal of Hyperthermia

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Background: Photothermal therapy is currently under the spotlight to improve the efficacy of minimally invasive thermal treatment of solid tumors. The interplay of several factors including the radiation wavelengths and the nanoparticle characteristics underlie the thermal outcome. However, a quantitative thermal analysis in in vivo models embedding nanoparticles and under different near-infrared (NIR) wavelengths is missing. Purpose: We evaluate the thermal effects induced by different combinations of NIR laser wavelengths and gold nanorods (GNRs) in breast cancer tumor models in mice. Materials and methods: Four laser wavelengths within the therapeutic window, i.e., 808, 940, 975, and 1064 nm were employed, and corresponding GNRs were intratumorally injected. The tissue thermal response was evaluated in terms of temperature profile and time constants, considering the step response of a first-order system as a model. Results: The 808 nm and 1064 nm lasers experienced the highest temperature enhancements (>24%) in presence of GNRs compared to controls; conversely, 975 nm and 940 nm lasers showed high temperatures in controls due to significant tissue absorption and the lowest temperature difference with and without GNRs (temperature enhancement <10%). The presence of GNRs resulted in small time constants, thus quicker laser-induced thermal response (from 67 s to 33 s at 808 nm). Conclusions: The thermal responses of different GNR-laser wavelength combinations quantitatively validate the widespread usage of 808 nm laser for nanoparticle-assisted photothermal procedures. Moreover, our results provide insights on other usable wavelengths, toward the identification of an effective photothermal treatment strategy for the removal of focal malignancies.

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Quantitative investigations on light emission profiles for interstitial laser treatment

Ta,

Kim,

Shin

et al. 2024

Biomed. Opt. Express

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Interstitial laser treatment (ILT) using a diffusing applicator (DA) has been employed to treat tumors. However, the treatment efficacy and safety of the emission profiles from DAs have been poorly explored. This study investigated the effect of the emission profiles from DAs on prostate tumor treatment. Dual-peak and proximal-/distal-end peak profiles using 980 nm laser at 5 W for 60 s were tested to compare the extent of thermal coagulation in soft tissue numerically and experimentally. The numerical simulation predicted the temperature development in the tissue. Ex vivo porcine liver and in vivo rat models were used to compare the performance of the profiles. The dual-peak profile yielded a coagulation extent that was almost equivalent to that of the flat-top profile (in simulation) and 1.3 times larger than those of the other profiles in both ex vivo and in vivo. The dual-peak profile predictably entailed uniform coagulation within the irradiated region. Further in vivo studies using different tumor sizes will be evaluated to warrant the efficacy and safety of the dual-peak profile for the ILT of prostate tumors.

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Dependence of Photothermal Responses on Wavelengths

Cited by 3 publications

References 10 publications

A Micron-Sized Laser Photothermal Effect Evaluation System and Method

A Micron-Sized Laser Photothermal Effect Evaluation System and Method

Thermal analysis of laser irradiation-gold nanorod combinations at 808 nm, 940 nm, 975 nm and 1064 nm wavelengths in breast cancer model

Quantitative investigations on light emission profiles for interstitial laser treatment

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