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(a) A schematic diagram showing the measurement system. PDG: pulse-delay generator; FG: function generator; RF-Amp: radio frequency power amplifier; MNW: matching network; ps: pico-second; HIFU: high intensity focused ultrasound; PMT: photomultiplier tube. (b) The configuration of the phantom, laser and detector.
Lateral distribution of the HIFU-induced temperature increase.
One example showing the background fluorescence photons. The tube was filled with fluorescent polymer solution and the HIFU was off.
One example showing USF photons. The tube was filled with fluorescent polymer solution. The HIFU was turned on for 100 ms before the rising edge of the trigger signal and maintained off after the rising edge.
USF photons distribution along lateral (X) direction. The left and right vertical axes represent the temperature and the (digitized) USF photons (indicated by the two dotted arrows).
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