Method and system for ultrasonic non-invasive transcranial imaging employing broadband acoustic metamaterial

A system for ultrasonic non-invasive transcranial imaging employing a broadband acoustic metamaterial, comprising:

• a reflected signal obtaining module configured to obtain reflected signals corresponding to different acoustic metamaterial parameter combinations and a skull as a whole, wherein acoustic metamaterial parameters comprise an average particle size, a doping ratio, a thickness, and a matrix molecular weight;
• an acoustic metamaterial parameter combination determination module configured to determine a to-be-determined acoustic metamaterial parameter combination according to a to-be-determined reflected signal and a trained three-layer BP neural network, wherein the trained three-layer BP neural network takes the reflected signal as an input and takes the acoustic metamaterial parameter combination corresponding to the reflected signal as an output;
• a first determination module configured to determine whether the to-be-determined acoustic metamaterial parameter combination is within a threshold space;
• an acoustic metamaterial preparation module configured to prepare an acoustic metamaterial using the to-be-determined acoustic metamaterial parameter combination if the to-be-determined acoustic metamaterial parameter combination is within the threshold space;
• an ultrasonic non-invasive transcranial imaging module configured to perform ultrasonic non-invasive transcranial imaging according to the prepared acoustic metamaterial and a resolution mold;
• and
• a to-be-determined reflected signal updating module configured to update the to-be-determined reflected signal, replace the to-be-determined reflected signal with the updated to-be-determined reflected signal, and return to the step of “determining a to-be-determined acoustic metamaterial parameter combination according to a to-be-determined reflected signal and a trained three-layer BP neural network” if the to-be-determined acoustic metamaterial parameter combination is not within the threshold space.