Patent ID: 11957436
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Measurement (Instruments)
Classification: CPC A  G | IPC A  G

Claim 7:
8. An in-vivo temperature measurement device comprising:
an ultrasonic wave irradiator that irradiates a living body with a first ultrasonic wave;
an ultrasonic wave detector that receives ultrasonic waves reflected by the living body;
a frequency calculator that calculates, based on information on a structure of the living body, a frequency of a second ultrasonic wave amplified in the living body;
an ultrasonic wave irradiation controller that sweeps a repetition frequency at which the first ultrasonic wave is emitted from the ultrasonic wave irradiator within a predetermined range centered on the frequency calculated by the frequency calculator;
a lock-in detector that detects a phase of an ultrasonic wave of the repetition frequency from the ultrasonic waves received by the ultrasonic wave detector;
a phase spectrum acquirer that collects phase values sequentially output from the lock-in detector and acquires a respective phase spectrum each of the ultrasonic waves;
a phase identifier that identifies, from phase spectrums of the ultrasonic waves, a respective phase of a respective peak frequency of a respective amplitude spectrum of each of the ultrasonic waves;
a phase change calculation portion that calculates an amount of phase change from phases of two peak frequencies of the ultrasonic waves obtained by sweeping the repetition frequency twice; and
a temperature change calculation portion that calculates an amount of temperature change in the living body from the amount of phase change.