41 results about "Ultrasound Tomography" patented technology

An orthogonal weak correlation bipolar encoding excitation method based on bi-level correlation function relates to an encoding excitation method of transmission-type ultrasound tomography. In order to solve the problem that ultrasound parameter errors are caused by interaction of ultrasound signals sent by array elements, the encoding excitation method includes following steps: an orthogonal weak correlation bipolar encoding set needed by encoding excitation is generated according to required array element amount launched simultaneously. The generated encoding set is used to modulate launching process of tomography and acquires waveform signals penetrating through detected objects. Transit time and amplitude are extracted from the received waveform signals by using the bi-level correlation function. Compared with existing methods without using the encoding excitation method, measurement time can be greatly reduced. Compared with conventional encoding excitation methods based on matched filtering, influence among array element transmitted waveforms can be reduced maximally, and precision of parameter extraction is not affected by encoding excitation process.