Abstract: An ultrasonic diagnostic system prepares a diagnostic data including image by transmitting ultrasonic pulses to a living tissue, and receiving and analyzing reflected wave of the ultrasonic pulses, and has an analytical processing unit to measure a backscattering intensity by using a scattering wave from a region of interest in the living tissue on a basis of the reflected wave which is received, and to detect a variation frequency of the measured backscattering intensity to obtain the diagnostic data to be available.

Abstract: An ultrasonic diagnostic system prepares a diagnostic data including image by transmitting ultrasonic pulses to a living tissue, and receiving and analyzing reflected wave of the ultrasonic pulses, and has an analytical processing unit to measure a backscattering intensity by using a scattering wave from a region of interest in the living tissue on a basis of the reflected wave which is received, and to detect a variation frequency of the measured backscattering intensity to obtain the diagnostic data to be available.

Abstract: A probe 10 transmits an ultrasonic pulse of a wide band, and detects its echo to generate a reception signal. The reception signals are respectively filtered by three filter parts (14a to 14c) of different passing bands. Outputs of the respective filter parts (14a to 14c) are signal components of a narrow band, and speckle components (interference components by a fine structure) appear conspicuously. Outputs of the respective filter parts (14a to 14c) are detected, and the detection outputs are set respectively as each color signal of R, G and B, and are composed by an image composition part (20), whereby a speckle part is displayed by coloring in R, G or B. As a tissue boundary part is high in a signal level in any band, it is displayed in a whitish color by composition.

Abstract: A probe 10 transmits an ultrasonic pulse of a wide band, and detects its echo to generate a reception signal. The reception signals are respectively filtered by three filter parts (14a to 14c) of different passing bands. Outputs of the respective filter parts (14a to 14c) are signal components of a narrow band, and speckle components (interference components by a fine structure) appear conspicuously. Outputs of the respective filter parts (14a to 14c) are detected, and the detection outputs are set respectively as each color signal of R, G and B, and are composed by an image composition part (20), whereby a speckle part is displayed by coloring in R, G or B. As a tissue boundary part is high in a signal level in any band, it is displayed in a whitish color by composition.

Abstract: A flow display method enabling the state of flows in a plane to be grasped together with inflow into and outflow from that plane. A Doppler method, for example, is used to obtain a velocity profile at each point in a planar area (100) of interest defined in a three-dimensional flow. A flow rate profile in the planar area (100) is found on the basis of the thus obtained velocity profile. From the flow rate profile and the velocity profile there are determined source points (12) representative of inflow into the planar area (100) and sink points (14) representative of outflow therefrom. Contour lines in the flow rate profile then join the source points (12) and the sink points (14) to obtain a display of planar streamlines (10).

Abstract: A method for estimating a flow in an observation plane from the Doppler velocity distribution in the observation plane. A Doppler flow function is found from the Doppler velocity distribution by linear integration. A flow rate passing through a path perpendicular to a beam direction is found from the Doppler velocity distribution, and a Doppler flow range function representing a variation of this flow rate in the beam direction is calculated. The Doppler flow range function is separated into a linear boundary flow range function which is a two-dimensional component and a planar boundary flow range function which is a three-dimensional component. The planar boundary flow range function is approximated by a stepwise quantized planar boundary flow range function which varies in unit flow rate, and sink points and source points (simple sources) are determined based on a step position of this quantized planar boundary flow range function.

Abstract: The proposed method permits expansion, compression or reversion of a frequency of a Doppler shift signal. Shift frequency components of a measured Doppler shift signal are multiplied desired times so as to eliminate aliasing or permit precise detection of slow targets. A phase difference obtained at a time in a very short period is substituted with a phase difference obtained in a period longer than the very short period. The frequency conversion is applicable to the continuous wave Doppler system and the pulsed Doppler system.

Abstract: An apparatus for measuring the velocity distribution in a fluid by a pulse-Doppler method using an ultrasonic waver or an electromagnetic wave. The observation wave is transmitted to and received from the fluid and the reflected echo from the fluid is received so as to obtain the Doppler frequency. A predetermined transverse section is scanned with the observation wave so as to obtain the Doppler velocity distribution in the transverse section. Since the Doppler velocity distribution only contains the component in the direction of the observation wave, the Doppler velocity distribution is cumulatively integrated in the direction orthogonal to the direction of the observation wave and the integrated values are differentiated again in the direction of the observation wave, thereby obtaining the component in the orthogonal direction by calculation. If the observation wave is an ultrasonic beam, it is possible to observe the velocity distribution of the bloodstream in the heart.