JPH0428355A - Color flow display device - Google Patents

Abstract

PURPOSE:To remove Pd without deteriorating resolving power by carrying out labelling for the colorless region on a screen and judging if the colorless region applied with labelling is pixel drop (Pd) or not, and carrying out coloring for the colorless region which is judged as Pd, through interpolation. CONSTITUTION:Ultrasonic wave echo signals are obtained from a living body by a probe 22 and a beam former 3, the blood flow doppler signal is taken out and analyzed by a CFM calculation part 4, the blood direction is converted to red and blue colors, and speed is converted to luminance, and stored as color image data into a frame memory 5. In a pixel drop compensation part 6, Pd is extracted from the image data stored in the frame memory 5, and colored through interpolation. Then, in a DSC 7, the image data which does not contain Pd is sent to form the display image data. Color flow display is performed on the screen of a CRT 8 according to the display image data. Accordingly, Pd can be perfectly eliminated, and since processing is not applied on the part other than Pd part, the reduction of resolving power is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color flow display device, and more particularly, to a color flow display device that can eliminate pixel drops without reducing resolution.

[Prior Art] A color flow display device is a device that uses ultrasonic waves to obtain a tomographic image of a living body, and displays the blood flow portion in color on a screen. - When fishing on a boat, the blood flow approaching the probe is colored red.
Distant blood flow is displayed in blue. Parts that are not blood flow are displayed in monochrome.

FIG. 5 shows an example of a color flow display, in which the blood flow portion A is displayed in color, and the other portions are displayed in monochrome.

By the way, due to the influence of noise contamination when receiving ultrasonic signals, a black dot-shaped pixel drop Pd occurs inside the blood flow section A.
may occur.

Since this pixel drop Pd is unsightly, conventionally it has been processed by smoothing to make it less noticeable.

[Problem to be solved by the invention] Conventionally, pixel drops Pd have been processed by smoothing to make them less noticeable, but if the degree of smoothing is low, pixel drops cannot be completely eliminated, and if the degree of smoothing is high, There is a problem that the resolution decreases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a color flow display device that can eliminate pixel drops without reducing resolution.

[Means for Solving the Problems] A color flow display device of the present invention is a color flow display device that displays a blood flow part in a living body in color on a screen, and includes a labeling means for labeling a colorless area of the screen. , a pixel drop determination means for determining whether each colorless area where 4=1 in the label is a pixel drop, and an interpolation coloring means for coloring the colorless area determined to be a pixel drop by interpolation based on the surrounding color. The second feature is that it is equipped with the following.

[Operation] In the color flow display device of the present invention, the labeling means performs labeling to distinguish the colorless areas on the screen. In addition to pixel drops, these colorless areas include backgrounds, heart walls, and the like.

Therefore, the pixel drop determining means determines whether the colorless area is a pixel drop or not, and extracts only the pixel drop.

Then, the interpolation color calculation means performs interpolation calculations on the pixel drop area using the surrounding colors, and
take care of yourself.

Therefore, pixel drops can be completely eliminated. Furthermore, since no processing is applied to areas other than pixel drops, there is no reduction in resolution.

[Embodiments] The present invention will be explained in more detail below based on embodiments shown in the drawings. Note that this invention is not limited to this.

FIG. 2 is a block diagram of a color flow display device 1 according to an embodiment of the present invention.

In this color flow display device 1, a probe 2 and a beam former 3 obtain an acoustic wave echo signal from a living body.

The CFM calculation unit 4 extracts the blood flow Doppler signal from the ultrasound echo signal, analyzes it, converts the blood flow direction into red and blue velocities into luminance, and converts it into image data.

This image data is stored in the frame memory 5.

As will be described later, the pixel drop compensator 6 extracts pixel drops from the image data stored in the frame memory 5 and colors them by interpolation.

Therefore, image data without pixel drops is sent to the DSC 7 and is used as image data for display.

Color flow display is performed on the screen of the CRT 8 using this display image data.

Now, FIG. 1 is a flowchart showing the operation of the pixel drop compensator 6.

In step S1, a colorless area on the screen is labeled. A known procedure can be used as a specific method for this labeling. FIG. 3 shows an example of labels, and labels N1 to N8 are written in each colorless area. Since the blood flow area A is colored, the label cannot be seen.

In step S2, it is determined whether there is a colorless area (or not). If there is a colorless area, step S2 is performed.
Proceed to step 3, and if there is no colorless area, end the pixel drop compensation process.

In step S3, one colorless area is extracted and it is determined whether it is a pixel drop. This determination is made based on the following conditions.

■If the colorless area is not surrounded by a colored area, it is not a pixel drop.

■If the colorless area is less than a predetermined size, it is not a pixel drop.

■'' If it is not determined that it is not a pixel drop in section 2 ■■, it is a pixel drop.

If the extracted one colorless area is not a pixel drop, the process returns to step S2 and it is determined whether there is another colorless area. On the other hand, if the extracted colorless area is a pixel drop, the process advances to step S4.

In step S4, coloring is performed by interpolating from the colors of the area surrounding the colorless area. A known procedure can be used as a specific interpolation method.

As an example, a case where linear interpolation between two points is used will be described with reference to FIG.

When the pixels on the screen are scanned in the direction of arrow α, a colorless area labeled N4 is found as the first pixel drop. A pixel without color is searched for in the vertical direction starting from the first pixel #1 (hereinafter simply referred to as #1) in the colorless area with the label N4. This finds pixels #1 to #4. Next, the colors of pixels #1 to #4 are determined by linear interpolation using the color Aa of the second pixel of #1 and the color Ab of the pixel immediately below #4.

If you repeat this, pixels #5 to #8 will become colored.
Then #9. #10 pixel is colored,
Next #11. #12 pixels are colored, then #1
Pixels 3 to #15 are colored, then pixel #16 is colored, and finally pixel #17 is colored 4=
Then, all uncolored areas of label N4 are colored.

In this way, by repeating steps 82 to 4, the uncolored areas of labels N4 to N7 are colored and pixel drops are eliminated.

Therefore, the screen becomes easy to view.

On the other hand, since no processing is performed on parts that are not pixel drops, the resolution does not deteriorate.

As described above, according to the color flow display device 1, pixel drops can be eliminated without deterioration of resolution.

[Effects of the Invention] According to the color flow display device of the present invention, pixel drops can be eliminated without reducing resolution. Therefore, easy-to-read color flow display can be performed.

[Brief explanation of drawings]

FIG. 1 is a flowchart 1 of pixel drop compensation processing according to the present invention, FIG. 2 is a block diagram of a color flow display device according to an embodiment of the present invention, and FIG. 3 is an explanatory diagram of labeling processing according to the present invention. , FIG. 4 is an explanatory diagram of the interpolation coloring process according to the present invention, and FIG. 5 is an illustrative diagram of a conventional color flow display screen. (Explanation of symbols) 1.Color flow display device 2..Probe 3..Beamformer 4..CFM calculation section 5..Frame memory 6..Pixel drop compensation section 7..DSC 8..CRT A...Blood flow portion Pd...Pixel drops N1 to N8...Label.

Claims (1)

[Scope of Claims] 1. A color flow display device that displays blood flow in a living body in color on a screen, comprising: a labeling means for labeling a colorless area on the screen; and each labeled colorless area is a pixel. A color flow display device comprising: pixel drop determining means for determining whether or not a pixel drop is a drop; and interpolation coloring means for coloring a colorless area determined to be a pixel drop by interpolation based on surrounding colors.