JPH02177947A - Ultrasonic doppler diagnosis device - Google Patents

Abstract

PURPOSE:To easily compare the spectrum of the time phase by linking and displaying the Doppler spectrum of the certain time phase in the desired heartbeat of the Doppler spectrum synchronized with an ECG. CONSTITUTION:A display time phase set part 4 receives an ECG waveform from an ECG electrode and a gate signal, which is delayed to the desired time phase with an R wave, for example, of the ECG waveform generated in a delay quantity and window width set part 3 as standard, for setting window width. Then, the B signal of the gate signal synchronized with the ECG waveform is supplied to a DSC 6. A reflected wave, to which Doppler shift is executed by blood current, is received, converted into the C signal of a Doppler signal on a time base in an FFT 5 and inputted to the DSC 6. The DSC 6 inputs a D signal, for which the signal of the waveform in the C signal is extracted by the gate of the B signal, to a display device 7 and displays the D signal. In such a way, since the Doppler spectrum of the specified time phase in the heatbeat extracted by the gate synchronized with the ECG is displayed, the time change of peak current velocity or the change of abnormal blood current, etc., can be easily compared and observed.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an ultrasonic Doppler diagnostic device that displays an image of the Doppler spectrum of blood flow, and particularly relates to an ultrasonic Doppler diagnostic device that extracts and displays the Doppler spectrum of the same time phase of a heartbeat. Related to Doppler diagnostic equipment.

(Prior Art) Ultrasonic pulses irradiated into a subject from an ultrasonic pulse Doppler diagnostic apparatus are reflected from blood cells in blood flowing through blood vessels, and are received with a frequency shift due to the Doppler effect.

Since the transmitted signal is a high-frequency pulse, the signal frequency-shifted by the blood cells in the blood vessel appears only after a delay time that depends on the depth of the blood vessel.

Therefore, by applying a gate set to a delay time corresponding to the depth to be detected, only the lower blur signal at that depth can be extracted. By imaging this, a Doppler shift image depending on the velocity of blood flow is observed.

(Problem to be solved by the invention) By the way, in conventional Doppler images, the obtained Doppler spectra are sequentially displayed on the screen following the time phase, and in order to compare Doppler spectra of the same time phase of heart beats, As shown in Figure 3, it was necessary to compare Doppler images that appear at distant positions on the screen. In the figure, 1 and 2 are images of waveforms to be compared and contrasted. In addition, when comparing spectra in the same time phase over a long period of time, since the time that can be displayed on one screen is limited, the scanning speed of the spectrum must be reduced to reduce the spectrum in the time direction, making accurate comparison difficult. Ta.

The present invention has been made in view of the above points, and its purpose is to connect and display only the Doppler spectra during the time phase of the heartbeat, and to display and compare images that focus on spectrum changes during that time phase. The objective is to realize an ultrasonic Doppler diagnostic device that can perform

(Means for Solving the Problem) The present invention for solving the above problem sets the time width of the signal to be extracted based on the amount of delay from a certain time phase of the ECG waveform and the delayed time. gate signal setting means for generating a gate; display time phase setting means for specifying a time phase of a spectrum to be displayed based on an ECG waveform and an output gate signal of the gate signal setting means; The apparatus is characterized by comprising a DSC which outputs spectrum data obtained by Fourier transforming the Doppler signal from FFT only at times specified by the signal from the display time phase setting means.

(Function) Set the delay amount and window width from a certain time phase, and
Blood flow Doppler shift images of a certain time width in a specific time phase of the G waveform are connected and displayed, and changes in blood flow in that time phase are compared and observed.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of essential parts of an apparatus according to an embodiment of the present invention. In the figure, 3 indicates an ECG signal for the display time phase setting section 4.
This is a delay amount and window width setting section that outputs a signal A for setting the delay amount from the time point when the waveform is formed to the time phase of the desired heartbeat and the gate width (window width) of the Doppler spectrum. The display time phase setting section 4 displays the ECG from the ECG electrodes.
Based on the waveform, delay amount, and signal A from the window width setting section 3, a signal B is output in which the time width for displaying the Ridopler spectrum is set. 5 is subjected to phasing and addition by the receiving beamformer, and the Doppler-processed signal is subjected to fast Fourier transform (hereinafter referred to as FFT) in the Doppler processing unit (not shown).
The Doppler signal on the frequency axis is converted into frequency shift data on the time axis using FFT, and a Doppler spectrum data C signal is output. Reference numeral 6 denotes a digital scan converter (hereinafter referred to as DSC) which converts the C signal from the FFT 5 into a television format signal only in the time phase specified by the B signal and outputs it as a D signal. Output D
The signal is displayed on a display device 7.

Next, the operation of the embodiment configured as described above will be explained with reference to FIG. FIG. 2 is a diagram of output signal waveforms of each part of the device of the embodiment. In the figure, (a) shows the ECG waveform from the ECGm pole attached to the subject. (B)
The figure shows image data of reflected waves Doppler-shifted by blood flow, and is a C signal that appears at the repetition period of the transmitted pulse. (C) The figure shows the B signal, which is the gate, created based on the ECG waveform in the figure (A). (D) The figure shows the Doppler signal extracted by the B signal, which is the gate, displayed on the display device 7. This is a continuous waveform D signal. Next, the embodiment shown in FIG. 1 will be explained. The display time phase setting section 4 receives the second signal from the ECG electrode.
Receives the ECG waveform in Figure (A) and a gate signal for setting the window width by delaying the ECG waveform, for example, the R wave, created in the delay amount and window width setting unit 3 to a desired time phase as a standard. Then, the B signal of FIG. 2 (c), which is a gate signal synchronized with the ECG waveform, is supplied to the DSC 6.

The reflected waves Doppler-shifted by the blood flow are received and F
In the FT 5, the signal is converted into a C signal having the waveform shown in FIG. 2 (b), which is a Doppler signal on the time axis, and is input to the DSC 6.

The DSC 6 inputs the D signal obtained by extracting the waveform signal of the C signal by the gate of the B signal to the display device 7 for display.

The displayed waveform is the continuous waveform shown in FIG. 2(d) extracted by the gate shown in FIG. 2(c).

In this way, by displaying the Dobra spectrum of a specific time phase of the heart beat extracted with a gate synchronized with the ECG, it is possible to easily compare and observe temporal changes in peak flow velocity, changes in abnormal blood flow, etc. Now you can.

(Effects of the Invention) As described in detail above, according to the present invention, by connecting and displaying the Doppler spectrum at the time phase in which the desired heartbeat occurs in the Doppler spectrum synchronized with the ECG, the spectrum at that time phase can be displayed. This allows easy comparison, which has a great practical effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the main parts of an embodiment of the present invention, FIG. 2 is a diagram of output waveforms of each part of the apparatus of the embodiment, and FIG. 3 is a diagram of a conventional Doppler shift image. 3...Delay amount and window width setting unit 4...Display time phase setting unit 5...FFT 6...DSC7...Display device

Claims (1)

[Claims] gate signal setting means for generating a gate for setting a time width of a signal to be extracted based on the amount of delay from a certain time phase of the ECG waveform and the delayed time; and an output gate of the ECG waveform and the gate signal setting means. display time phase setting means for specifying the time phase of the spectrum to be displayed based on the signal; and display time phase setting means for specifying the time phase of the spectrum to be displayed based on the FFT signal, and display time phase setting means for specifying the time phase of the spectrum to be displayed based on the signal;
An ultrasonic Doppler diagnostic apparatus comprising: a DSC that outputs Fourier-transformed spectrum data from FT.