Dynamic changes of Δ α
in ex vivo porcine muscle tissue during HIFU treatment. (A) A total of four lesions were created at every TAP. Δα0 values for each lesion were estimated by spatially averaging the Δα0 values in the ROI, and then those values were further averaged with each other generating an average profile for each TAP value. For monitoring duration of 10 min, the duty cycle was 77%, resulting in TAP values of 34, 37, 39, 44, and 49 W, for a HIFU treatment time of 40 s. (B) Dynamic changes of Δα0 in ex vivo porcine muscle tissue during HIFU treatment presented without the error bars.