![]() In vivo results showed that the optoacoustic temperature imaging is a promising non-invasive technique for real-time imaging of tissue temperature during cryotherapy of prostate cancer, which can be combined with transrectal ultrasound-the current standard for guiding clinical cryotherapy procedure. It is common for an armpit (axillary) temperature to register 0.5☏ (0.3☌) to 1☏ (0.6☌) lower than an oral temperature, but most professionals suggest passing on this method due to the difficult task of placing the thermometer in the proper position. The temperature was mapped with errors not exceeding ☒ ☌ (standard deviation) consistent with the clinical requirements for monitoring cryotherapy of the prostate. Ear (tympanic) results may also be 0.5☏ (0.3☌) to 1☏ (0.6☌) higher than an oral temperature. The temporal profiles of the readouts from the thermal needle sensors and the temporal profile estimated from the normalized optoacoustic intensity of the selected vascularized region showed significant resemblance, except for the initial overshoot, that may be explained as a result of the physiological thermoregulatory compensation. The constructed temperature maps and their temporal dynamics were consistent with the arrangement of the cryoprobe and readouts of the thermal needle sensors. The transrectal optoacoustic images showed high-contrast vascularized regions, which were used for quantitative estimation of local temperature profiles. Desde un punto de vista microscópico, es una medida de la energía cinética asociada al movimiento aleatorio de las partículas que componen el sistema. Optoacoustic imaging of temperature during prostate cryotherapy was performed in the longitudinal view over a region of 30 mm (long) × 10 mm (deep) that covered the rectum, the Denonvilliers fascia, and the posterior portion of the treated gland. La temperatura es un parámetro físico descriptivo de un sistema que caracteriza el calor, o transferencia de energía térmica, entre ese sistema y otros. The universal temperature-dependent optoacoustic response of blood was employed to convert reconstructed optoacoustic images to temperature maps. It is common for an armpit (axillary) temperature to register 0.5F (0.3C) to 1F (0.6C) lower than an oral temperature, but most professionals suggest passing on this method due to the difficult task of placing the thermometer in the proper position. Cryotherapy of a canine prostate was performed in vivo using a commercial clinical system, Cryocare ® CS, with an integrated ultrasound imaging. Ear (tympanic) results may also be 0.5F (0.3C) to 1F (0.6C) higher than an oral temperature. We developed a preclinical prototype optoacoustic temperature imager that included pulsed optical excitation at a wavelength of 805 nm, a modified clinical transrectal ultrasound probe, a parallel data acquisition system, image processing and visualization software. The objective of this study is to demonstrate in vivo the feasibility of optoacoustic temperature imaging during cryotherapy of prostate cancer.
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