Propagation rate measurement device, propagation rate measurement program, and propagation rate measurement method

摘要

A sonic speed measurement device in which reliability is enhanced while the amount of calculation is minimized is provided. A propagation path postulation component postulates the sonic speed through bone, and calculates propagation paths up until ultrasonic waves transmitted from a wave transmitter are received by oscillators. A postulated propagation time calculator calculates the propagation time it takes for the ultrasonic waves transmitted from the wave transmitter to be received by the oscillators, based on the propagation paths. A Fourier transform component subjects I signals and Q signals of signals outputted by the oscillators to Fourier transform to generate Fourier transform data. A phase shifter shifts the phase of the Fourier transform data for the oscillators in a frequency region according to the propagation time. A sonic speed derivation component determines the validity of the postulated sonic speed based on the Fourier transform data shifted by the phase shifter.

主权项

1. A propagation rate measurement device comprising:
a wave transmitter configured to transmit signals toward a measurement object; a plurality of receivers configured to receive signals from the measurement object, and configured to output received signals corresponding to the signals that have been received; a propagation path setting component configured to set propagation rate of signals through the measurement object, and configured to calculate propagation paths up until the signals transmitted from the wave transmitter are received by the receivers; a propagation time calculator configured to calculate propagation time it takes for the signals transmitted from the wave transmitter to be received by the receivers based on the propagation paths; a Fourier transform component configured to generate Fourier transform data by subjecting the received signals outputted by the receivers to Fourier transform; a phase shifter configured to shift phase of the Fourier transform data for the receivers by frequency domain according to the propagation time; and a propagation rate derivation component configured to determine validity of the set propagation rate based on the Fourier transform data that has been shifted by the phase shifter.