Photoablative laser therapy is in common use for selective destruction of malignant masses, vascular and brain abnormalities. Tissue ablation and coagulation are irreversible processes occurring shortly after crossing a certain thermal exposure threshold. As a result, accurate mapping of the temperature field is essential for optimizing the outcome of these clinical interventions. Here we demonstrate four-dimensional optoacoustic temperature mapping of the entire photoablated region. Accuracy of the method is investigated in tissue-mimicking phantom experiments. Deviations of the volumetric optoacoustic temperature readings provided at 40ms intervals remained below 10% for temperature elevations above 3°C, as validated by simultaneous thermocouple measurements. The excellent spatio-temporal resolution of the new temperature monitoring approach aims at improving safety and efficacy of laser-based photothermal procedures.
Francisco Javier Oyaga Landa, Xosé Luís Deán-Ben, Ronald Sroka, and Daniel Razansky, "Four-dimensional optoacoustic temperature mapping in laser-induced thermotherapy," Proc. SPIE 10494, Photons Plus Ultrasound: Imaging and Sensing 2018, 104940D (Presented at SPIE BiOS: January 28, 2018; Published: 19 February 2018); https://doi.org/10.1117/12.2288924.
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