Side view of the experimental setup.
(a) Gross pathologic photograph of the sample used in the experiment. (b) Reconstructed image using the local-tomography-type algorithm. (c) Reconstructed image using the approximate filtered backprojection algorithm. The lesion region is indicated by arrows.
(a) Photograph of the phantom used in the experiment. (b) Reconstructed image using local-tomography-type method.
(a) Gross pathologic photograph of the sample used in the experiment; the lesion was induced at a radio frequency power of 15 W for one and one half minutes. (b) Schematic side view of the sample. Reconstructed image using local-tomography-type reconstruction method: (c) before heating; (d) after heating. (e) The differential image obtained by subtracting the data collected before heating from the data collected after heating. The lesion regions are indicated by dashed circles.
Scatter plot of the area of the lesion evaluated using TAT versus the area measured from pathologic photographs. The evaluation was applied to ten lesions; the regression equation obtained using the weighted LS regression was .
Simulation of a piezoelectric signal in response to a microwave-induced thermoacoustic signal. (a) The temporal profile of the impulse response of the 2.25 MHz transducer. (b) Spectrum of the 2.25 MHz ultrasonic transducer. (c) Temporal profile of the microwave pulse used in the simulations. (d) Thermoacoustic signals induced by an ideal microwave pulse for a sample with a low microwave absorption region in the center. (e) Thermoacoustic signals induced by microwave pulses used in the experiments for the same samples used in (d). (f) Simulated piezoelectric signals of the 2.25 MHz ultrasonic transducer for (e).
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