JPS596032A - Pulse doppler blood flow speed measuring apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic pulsed Doppler diagnostic device capable of displaying B-mode images, M-mode images, and Doppler frequency analysis, and particularly to a blood flow velocity measurement and display device based on frequency components of Doppler signals.

The method of displaying blood flow velocity in a conventional Doppler device is to display time on the horizontal axis, frequency on the vertical axis, and frequency intensity using brightness. This makes it difficult to read the correspondence on the B-mode tomographic image. As shown in Figure 1, which shows the conventional display method,
The B-mode image displayed on the right side does not display Doppler blood flow information, making it difficult to make a corresponding diagnosis.

An object of the present invention is to provide a pulsed Doppler blood flow system that displays the blood flow velocity and its change on a B-mode image using a line length with an arrow, and allows the blood flow in a certain part of the B-mode image to be directly grasped. The purpose is to provide a speed display device.

The purpose of this is to split the signals of the same frequency components obtained for conventional frequency analysis display, use calculations to detect the forward and reverse of the average value of blood flow, and correspond to the detected values in the B-mode image. C achieved by displaying a pointed straight line with a length of E! This becomes clear from the comparison of the first diagram showing the conventional example in A and FIGS. 2 and 3.

Figure 1 shows a conventional display screen 10, with a DJ on the upper left side.
A mode image (goods) and a Doppler image (to) are displayed on the lower left side, while B and a mode image (B') are displayed on the right side, but there is no display regarding blood flow velocity. Note that 14 is the sample volume, which is the error line of the 12U beam.

An example of the display mode according to the present invention is shown in FIG. 2. The left side of the display screen 16 is omitted because it is the surface of the conventional example in FIG. 1, and the right side is a B-mode image (B ) is displayed, and an arrow 18 having a length corresponding to the average flow velocity within the sample volume 14 is added and displayed.

FIG. 3 is a schematic block diagram showing one embodiment of the present invention. 20 is a fast Fourier transform (F, F, , T) processing unit; 22 is a conventional display circuit; 24 is a Doppler image display monitor; 26 is a calculation unit that detects the average value of blood flow and all its forward and reverse values;
28 is a data processing unit for creating arrows, 34 is a D-8C (digital, scan converter) (7), 1%lJ,
36 is a B-mode image display monitor. In addition, D, S,
C memory 34 follows B-mode display system circuitry 32. Orthogonally detected Doppler signals V,, V
b is output as a frequency component having a real part (Re, ) and an imaginary part (Im) by the Fourier transform processor 20, and is displayed on the monitor 24 via the display circuit 22 on the one hand, and is branched and calculated on the other hand. The signal is input to section 26 and the function is detected.

In order to attach an arrow image to one end of a straight line to display the forward/reverse direction, the necessary data is outputted by the processing section 28 and written to the S and C 34, where it is superimposed on the B mode image and displayed on the monitor 36. , will be displayed as shown on the right screen in Figure 2. In the B-mode image (B), a peak line 18 corresponding to the instantaneous average blood flow velocity within the sample volume is displayed in real time while changing every moment, allowing an intuitive grasp of the blood flow velocity distribution.

According to another embodiment of the invention, an external setting device 30, such as a joystick, is provided, and information regarding the starting point and direction of the arrow is input by the operator. . Since this also relates to the incidence of the ultrasound beam and the B-mode image, on the one hand, the data is input to the drB-mode display system circuit 32 and corrected. On the other hand, the length of the arrow must be corrected depending on the angle formed by the set direction and the ultrasonic incident beam, and a calculation section for this is added to the data processing section 28. In this way, while observing the B-mode image, the velocity component along the actual blood flow direction can be arbitrarily displayed.

Furthermore, according to another example of ability, instead of the one channel described above, it is possible to detect Doppler signals at multiple sites from one ultrasound beam, and if they are displayed in the same way, multiple arrows will be generated. Blood flow velocities at multiple sites are displayed simultaneously on a B-mode image.

[Brief explanation of drawings]

FIG. 1 shows a screen display mode according to a conventional example, FIG. 2 shows a display mode according to the present invention, and FIG. 3 is a schematic block diagram showing an embodiment of the present invention. 20 C is a high-speed Fourier transform processing unit, 26 is an arithmetic unit, 28 is an arrow creation processing unit, 30 is an external setting device, 32 is a B-mode display system circuit, 34 is a beam, S, C, and 36 is a B-mode monitor. . Patent applicant: Shimadzu Corporation

Claims (2)

[Claims] (1) In an ultrasonic pulsed Doppler diagnostic device that can display B-mode images, M-mode images, and Doppler frequency analysis, detect the average value of blood flow and its forward and backward directions in terms of beam and beam directions from the frequency components of the Doppler signal. A calculation section is provided to calculate the B mode,
A pulsed Doppler blood flow velocity measuring device characterized in that S and C memories follow and an arrow line with a length corresponding to a calculated value is displayed on a B-mode image. (2) An external setter for information regarding the starting point and direction change of the arrow is provided, and the data processing section is followed by the flB mode system circuit on the other hand, and the data processing section is used to perform a calculation for correcting the length of the arrow. The pulsed Doppler blood flow rate measuring device N according to claim 1, further comprising: