Scattering tomography device and scattering tomography method

A scattering tomography method comprising:

• transmitting, by a transmitting antenna, radio waves into an interior of an object from outside the object;
• receiving outside the object, by a receiving antenna, scattered waves of the radio waves transmitted into the interior of the object by the transmitting antenna;
• and
• obtaining a measurement result of the scattered waves on each of a plurality of days to obtain measurement results over a plurality of days, and generating a reconstructed image showing a persistent element inside the object based on the measurement results,
• wherein the obtaining of measurement results and generating of a reconstructed image includes:
• calculating, for each of the measurement results and using the measurement result as a boundary condition, a scattering field function that takes a transmission position of the radio waves and a reception position of the scattered waves as inputs and outputs an amount of the scattered waves at the reception position;
• calculating, for each of the measurement results, a visualization function that takes a location to be visualized as an input and outputs an image intensity at the location to be visualized, and is defined based on the amount output from the scattering field function in response to inputting the location to be visualized into the scattering field function as the transmission position and the reception position;
• generating an intermediate image for each of the measurement results based on the visualization function to generate intermediate images for the measurement results;
• and
• generating the reconstructed image by calculating a minimum value of the image intensity at each position in the intermediate images using a logical conjunction.