JPH0566812B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] A method for displaying color images and black-and-white images, such as an ultrasound diagnostic device, for example, by displaying B-mode tomographic image data and two-dimensional color Doppler tomographic image data.
The B-mode tomographic image and the two-dimensional color Doppler tomographic image are sent to each line memory in a time-division manner via a common bus, written to the corresponding frame memory by a digital scan converter, and read out from the frame memory. In the line memory control method for displaying the two-dimensional color Doppler tomographic image on a television monitor by combining the two-dimensional color Doppler tomographic image with the B-mode tomographic image,
By providing a means for writing '0' into an area outside the designated area of the line memory of the color image as the two-dimensional color image display designated area moves simultaneously when writing the mode tomographic image into the line memory, The two-dimensional color Doppler tomographic image is erased.

[Industrial application field]

The present invention provides, for example, B in an ultrasonic diagnostic apparatus.
The mode tomographic image data and the two-dimensional color Doppler tomographic image data are sent to each line memory via a common bus in a time-sharing manner, and are written to the corresponding frame memory by a digital scan converter. B read from
The present invention relates to a line memory control method when a mode tomographic image and a two-dimensional color Doppler tomographic image are combined and displayed on a television monitor.

In recent ultrasound diagnostic apparatuses, two-dimensional color Doppler tomographic images are displayed in order to facilitate diagnosis using ultrasound tomographic images.

At this time, from an economic standpoint, the B-mode tomographic image data and the above-mentioned two-dimensional color Doppler tomographic image data are written to their respective line memories in a time-sharing manner via a common bus, and then each is transferred to a digital scan converter. After transferring the data to a frame memory, the outputs of the frame memory are combined and displayed on a television monitor.

On the composite image displayed in this way,
When attempting to move only a two-dimensional color Doppler tomographic image, it is necessary to erase the two-dimensional color Doppler tomographic image that has been written to the line memory before movement, but this is done in such a way as to not impair the usage efficiency of the common bus. Therefore, in order to erase the two-dimensional color Doppler tomographic image, it is necessary to erase the two-dimensional color Doppler tomographic image at high speed.

[Problems to be solved by conventional technology and invention]

FIG. 3 is a diagram explaining the conventional line memory control method, in which a shows the memory configuration of the digital scan converter, b shows the internal structure of the line memory, and c conceptually shows image composition. As an example, B in an ultrasound diagnostic device is
This shows a case where a mode tomographic image and a two-dimensional color Doppler tomographic image are combined and displayed.

First, the analog/digital converter (A/D)
B-mode tomographic image data is obtained from 60, and two-dimensional color Doppler tomographic image data is obtained from a color Doppler analyzer (for example, by autocorrelation) 61.
In synchronization with the ultrasonic scanning line number from the beam scan control unit 6, it is sent to the common bus 7 in a time-sharing manner (however, at this time, the scanning line number of the B-mode tomographic image and the two-dimensional color Doppler tomographic image (does not necessarily match the scanning line number), and are written to the corresponding line memories (white/black) 1a and (color) 1b.

At this time, the data structure in the line memories 1a and 1b is as shown in figure b, with the word direction corresponding to the ultrasound scanning line number (0 to 127), and the B mode tomographic image data or 2 Stores dimensional color Doppler image data.

The ultrasonic tomographic image data stored in this way is transferred to a digital scan converter (DSC) 2.
is displayed on the television monitor 5 by reading it from the line memories 1a, 1b and writing it into the frame memories 3a, 3b in accordance with the scanning line direction of the television monitor 5. When writing, all ultrasonic scan numbers from 0 to 127 are written to the line memory 1a, and for two-dimensional color Doppler tomographic image data, the area to be displayed in color on the B-mode tomographic image is written to the line memory 1a. For example, by instructing the ultrasound scan numbers at both ends of the region to the beam scan control unit 6 by using a slide volume (not shown), color tomographic image data (color Doppler analysis unit 61) is written into the line memory 1b, and the data in the line memory 1b is controlled to be transferred to the frame memory 3b under the control of the digital scan converter (DSC) 2.

When displaying the B-mode tomographic image and the two-dimensional color Doppler image on the television monitor 5, the image data read from the respective frame memories 3a and 3b are simply superimposed and then converted into a standard television signal. indicate.

Therefore, when moving the display position of the two-dimensional color Doppler image stored in the line memory 1b using this conventional line memory control method,
Using the same method as writing B-mode tomographic image data to the line memory 1a, write all '0's sequentially from ultrasonic scanning line number 0 to the new specified area,
The beam scan control unit 6 controlled to write the color tomographic image data from the color Doppler analysis unit 61 into the specified area, and when it went outside the specified area, all '0's were written again. .

Therefore, it takes time to change the contents of the line memory 1b, and the common bus 7
There was a problem in that the usage efficiency of the common bus 7 decreased as a result of it being used exclusively for erasing the contents of the bus 7.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional drawbacks, it is an object of the present invention to provide a method for erasing two-dimensional color Doppler tomographic image data from a line memory without reducing the usage efficiency of a common bus.

[Means for solving problems]

FIG. 1 is a diagram showing an example of the configuration of a line memory control method according to the present invention.

In the present invention, for example, B-mode tomographic image data and two-dimensional color Doppler tomographic image data in an ultrasound diagnostic apparatus are sent to the respective line memories 1a and 31b via the common bus 7 in a time-sharing manner. , the corresponding frame memory 3 by the digital scan converter 2
a, 3b, and write to the frame memories 3a, 3b.
This is a line memory control method that combines a B-mode tomographic image read out from B-mode tomographic image and a two-dimensional color Doppler tomographic image and displays it on a television monitor. When displaying the B-mode tomographic image by moving it arbitrarily, when writing the B-mode tomographic image to the line memory 1a, at the same time as the color image display designated area moves, the line memory 1b of the color image is written.
Configure it so that '0' is written to the area outside the specified area.

[Effect]

That is, according to the present invention, for example, monochrome image data such as B-mode tomographic image data and color image data such as two-dimensional color Doppler tomographic image data are transmitted to each line via a common bus in a time-sharing manner. Send to memory, write to corresponding frame memory by digital scan converter,
In a line memory control method for combining black and white image data read from the frame memory and color image data and displaying the resultant on a television monitor, when displaying the color image by arbitrarily moving within the black and white image, By providing a means for writing '0' into an area outside the designated area of the line memory for the color image as the color image display designated area moves when writing the black and white image data to the line memory, the color Since the image is erased, the old color data on the line memory can be erased at high speed without reducing the usage efficiency of the common bus.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.
The above-mentioned FIG. 1 is a diagram showing a configuration example of the line memory control method of the present invention, and FIG. 2 is a diagram illustrating an embodiment of the present invention.
and the line memory control signal 7a output from the beam scan control section 6 are necessary means to implement the present invention. Note that the same reference numerals indicate the same objects throughout the figures.

The line memory control method of the present invention will be explained below with reference to FIGS. 1 and 2.

Even if the present invention is implemented, for example, an analog/digital converter (A/D) in an ultrasonic diagnostic device
B-mode tomographic image data is obtained from 60, and two-dimensional color Doppler image data is obtained from color Doppler analyzer 61.
The operations outputted to the common bus 7 in a time-division manner are the same, and from the line memories 1a and 1b,
The operation in which the display data is transferred to the frame memories 3a and 3b and displayed on the television monitor 5 is also omitted because it is not particularly different from the conventional method.Here, the two-dimensional color Doppler tomographic image data in the line memory 1b is The explanation will focus on the erasing method.

First, as described above, a new display area of a two-dimensional color Doppler tomographic image on a B-mode tomographic image is specified using a slide volume (not shown), and the ultrasonic scanning lines at both ends of the area are designated. The number is input to the beam scan control section 6.

In the beam scan control unit 6, the B-mode tomographic image data from the analog/digital converter (A/D) 60 is sent to the common bus 7, and the area corresponding to the ultrasonic scanning line numbers 0 to 127 of the line memory 1a is In the present invention, for example, three types of line memory control signals are used, namely, a write signal for the line memory 1a, a write signal for the line memory 1b, a write signal for the line memory 1a, and a gate circuit 8 for the line memory 1b. Among the signals to be inhibited, the following write control is performed using .

Up to the area corresponding to the ultrasound scanning line number indicating the area where the two-dimensional color Doppler tomographic image is displayed,
By the above-mentioned line memory control signal, at the same time as the B-mode tomographic image data is written into the line memory 1a, the line memory 1b is written.
The gate circuit 8 is inhibited and controlled to write all '0' data. (See Figure 2) Next, for the area where the two-dimensional color Doppler tomographic image is to be displayed, a white/black B-mode tomographic image is displayed only for the line memory 1a by the line memory control signal. Control writing data.

As a result, in the relevant area of the line memory 1b,
The previous color image will remain.

Then, outside the area of the two-dimensional color Doppler tomographic image where the new display is to be performed, the line memory control signal causes the line memory 1a to simultaneously write B-mode tomographic image data to the line memory 1a. 1b, the gate circuit 8 is inhibited to write all '0' data.

Thereafter, when the two-dimensional color Doppler tomographic image data is output from the color Doppler analysis unit 61 to the common bus 7, the line memory control signal is used to
The color tomographic image data is controlled to be written only to the color display area of the line memory 1b. This operation is the same as the conventional method. (Second
(See figure) By controlling in this way, the color image in a specific area of the line memory 1b can be erased without changing the write time to the line memory 1b compared to the conventional method, and the two-dimensional color Doppler tomographic image can be It can be moved.

As described above, the present invention allows, for example, B-mode tomographic image data and two-dimensional color Doppler tomographic image data in an ultrasound diagnostic apparatus to be transmitted via a common bus.
In a control method for writing data into a line memory in a time-division manner, when writing B-mode tomographic image data into the corresponding line memory, the erasing operation of the data in the corresponding line memory, which is necessary when moving the two-dimensional color Doppler tomographic image, is performed. The feature is that at the same time, the non-color display area of the line memory in which the two-dimensional color Doppler tomographic image data is written is erased.

In the above embodiment, the B-mode tomographic image data of the ultrasonic diagnostic apparatus and
Although the explanation has been given using an example in which two-dimensional color Doppler tomographic image data is output in a time-division manner, it goes without saying that the image data output on the common bus is not limited to this. That's true.

〔Effect of the invention〕

As described above in detail, the line memory control method of the present invention allows, for example, B-mode tomographic image data and two-dimensional color Doppler tomographic image data in an ultrasound diagnostic apparatus to be transmitted via a common bus in a time-sharing manner. The B-mode tomographic image read from the frame memory and the two-dimensional color Doppler tomographic image are combined and displayed on a television monitor. In the line memory control method for displaying the two-dimensional color Doppler tomographic image while arbitrarily moving within the B-mode tomographic image, when writing the B-mode tomographic image in the line memory, the two-dimensional color Doppler tomographic image is displayed at the same time. The two-dimensional color Doppler tomographic image is erased by providing a means for writing '0' into an area outside the designated area of the line memory of the color image as the image display designated area moves. Therefore, there is an effect that the old color data on the line memory can be erased at high speed without reducing the usage efficiency of the common bus.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a configuration example of the line memory control method of the present invention, FIG. 2 is a diagram explaining an embodiment of the present invention, and FIG. 3 is a diagram explaining a conventional line memory control method. be. In the drawing, 1a and 1b are line memories, 2
is a digital scan converter (DSC), 3
a, 3b are frame memories, 4 is a combination unit, 5 is a television monitor, 6 is a beam scan control unit, 60 is an analog/digital converter (A/D), 61 is a color Doppler analysis unit, 7 is a common bus, 8 indicate gate circuits, respectively.

Claims (1)

[Claims] 1. Black and white image data and color image data,
It is sent to each line memory 1a, 1b via the common bus 7 in a time-division manner, and is sent to the corresponding frame memory 3 by the digital scan converter 2.
a, 3b, and write to the frame memories 3a, 3b.
A line memory control method for combining the black-and-white image read from b and a color image and displaying the same on a television monitor, in which the color image is arbitrarily moved and displayed on the black-and-white image, When a black and white image is written to the line memory 1a, control is performed to simultaneously write '0' in an area outside the specified area of the line memory 1b for the color image as the color image display specified area moves. Line memory control method.