JP2984860B2 - Ultrasound image diagnostic equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic diagnostic imaging apparatus, and more particularly, to an ultrasonic diagnostic imaging apparatus capable of moving a display field of view with a simple configuration.

[0002]

2. Description of the Prior Art FIG.
FIG. 3 is a block diagram showing the configuration of FIG. The ultrasonic probe 2
An ultrasonic beam 3 is emitted into a living body. Then, the ultrasonic echo signal reflected from the living body is detected, converted into an electric signal, and output. The electronic scanning unit 4 determines the scan line angle θj.

An A / D converter 5 converts the electric signal from analog to digital. Line buffer memory 6
Stores data for one sound ray.

A transfer address generator 10 outputs a read line address R for reading data from the line buffer memory 6. Further, it outputs a write screen horizontal address X and a write screen vertical address Y for writing data to the frame memory 7. The write screen horizontal address X and the write screen vertical address Y are generated from the read line address R and the scan line angle θj based on the contents of the ROM. ROM
Are prepared by the number of display magnifications that can be specified by the user.

[0005] The frame memory 7 stores data for one screen. Imaging is performed by transferring data from the line buffer memory 6 to the frame memory 7. The D / A converter 8 converts data read from the frame memory 7 from digital to analog. The monitor 9 displays an image. As shown in FIG. 5, the display area has a size corresponding to the display magnification specified by the user (images A, B, and
The display magnification increases in the order of C).

On the other hand, Japanese Patent Application Laid-Open No. 61-288847 discloses another ultrasonic diagnostic imaging apparatus. In this ultrasonic diagnostic imaging apparatus, a line address and a screen address are calculated by a coordinate conversion operation from an area selected by a user, so that only an arbitrary area G can be enlarged and displayed as shown in FIG. It has become.

[0007]

In the ultrasonic diagnostic imaging apparatus 51 shown in FIG. 4, the data stored in the line buffer memory 6 is read out in order from the top, and the write screen horizontal address X, write corresponding to the display magnification is written. Since high-magnification display is performed because the image is written into the frame memory 7 at the screen vertical address Y, there is a problem that the display is fixed to only the shallow portion (A in FIG. 5). On the other hand, in the ultrasonic diagnostic imaging apparatus disclosed in Japanese Patent Application Laid-Open No. 61-288847, the display area can be arbitrarily moved (G in FIG. 6), but the configuration for coordinate transformation calculation becomes large. There is.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ultrasonic diagnostic imaging apparatus which is limited to movement in the direction of the center line, but can move the field of view with a simple configuration.

[0009]

According to the present invention, there is provided an ultrasonic diagnostic imaging apparatus comprising: a line memory for storing sound ray data;
A frame memory for storing image data; transfer address generating means for outputting a read address for reading data from the line memory and a write address for writing the data to the frame memory; and a display for reading and displaying the data in the frame memory The ultrasonic diagnostic imaging apparatus having a unit for adding a line offset amount calculated according to a set display depth and a scan line angle to a read address output from the transfer address generating unit to a line memory. A read address changing unit that sets a read address; and a frame address obtained by adding a horizontal offset amount calculated according to the set display depth and scan line angle to a write address output from the transfer address generating unit. Write address change means for writing addresses to It is an aspect of the structure that was.

[0010]

In the ultrasonic diagnostic imaging apparatus of the present invention, the read address output from the transfer address generating means is added with the line offset amount calculated according to the display depth and the scan line angle by the read address changing means, and this is added. This is a read address to the line memory. On the other hand, the write address output from the transfer address generating means plus the horizontal offset amount calculated according to the set display depth and scan line angle by the write address changing means is written into the frame memory. Address. This allows the field of view to move in the direction of the center line.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. It should be noted that the present invention is not limited by this. FIG. 1 shows an ultrasonic diagnostic imaging apparatus 1 according to the present invention.
FIG. 2 is a block diagram showing a configuration of one embodiment.

The ultrasonic probe 2 emits an ultrasonic beam 3 into a living body. Then, the ultrasonic echo signal reflected from the living body is detected, converted into an electric signal, and output. The electronic scanning unit 4 determines the scan line angle θj.

The A / D converter 5 converts the electric signal from analog to digital. Line buffer memory 6
Stores data for one sound ray.

The transfer address generator 10 outputs a read line address R for reading data from the line buffer memory 6. Further, it outputs a write screen horizontal address X and a write screen vertical address Y for writing data to the frame memory 7. The write screen horizontal address X and the write screen vertical address Y are generated from the read line address R and the scan line angle θj based on the contents of the ROM. ROM
Are prepared by the number of display magnifications that can be specified by the user.

The offset generator 11 has a line address offset ΔR and a screen horizontal address offset Δ
Output X. The line address offset amount ΔR and the screen horizontal address offset amount ΔX are generated based on the display depth Ys specified by the user and the scan line angle θj. Line address offset amount ΔR = Ys / cos
(θj), screen horizontal address offset amount ΔX = Ys · ta
n (θj).

The adder 12 adds the line address offset amount ΔR and the line address R, and gives the obtained address (R + ΔR) to the line buffer memory 6 as a new line address.

The adder 13 adds the horizontal screen address offset amount ΔX and the horizontal screen address X, and gives the obtained address (X + ΔX) to the frame memory 7 as a new horizontal screen address.

The frame memory 7 stores data for one screen. Imaging is performed by transferring data from the line buffer memory 6 to the frame memory 7. The D / A converter 8 converts data read from the frame memory 7 from digital to analog. The monitor 9 displays an image. As shown in FIG. 5, the display area has a size corresponding to the display magnification specified by the user (images A, B, and
The display magnification increases in the order of C). Also, as shown in FIG. 2, the display area can be moved in the direction of the center line V by specifying the display depth Ys.

FIG. 3 is an explanatory view of the principle that the display area can be moved in the direction of the center line V by specifying the display depth Ys. The offset generator 11 generates a line address offset amount ΔR, where ΔR = Ys / cos (θj)
Therefore, as shown in FIG. 3, data of the deep part α-β is read from the line buffer memory 6 instead of the shallow part ab of the sound ray j. Further, the offset generator 11 generates the screen horizontal address offset amount ΔX, but ΔX = Ys ·
tan (θj), as shown in FIG. 3, the screen corresponding position AB (the shallow part ab of the sound ray j) of the frame memory 7
Screen writing position α-β instead of the data writing position)
The data is written to. Therefore, as shown in FIG. 2, the region of the depth Ys can be displayed without distortion.

The above-described ultrasonic diagnostic imaging apparatus 1 is easy to implement because only the offset generator 11 and the adders 12 and 13 are added to the conventional ultrasonic diagnostic imaging apparatus 51. Then, the movement is limited to the movement in the direction of the center line V, but the view can be moved at any display magnification.

[0021]

According to the ultrasonic diagnostic imaging apparatus of the present invention, it is possible to move the visual field in the center line direction with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of an ultrasonic diagnostic imaging apparatus according to the present invention.

FIG. 2 is an explanatory diagram showing movement of a display area in the apparatus of FIG.

FIG. 3 is a diagram illustrating the principle of the apparatus of FIG. 1;

FIG. 4 is a block diagram illustrating a configuration of an example of a conventional ultrasound image diagnostic apparatus.

FIG. 5 is an explanatory diagram of a display magnification and a size of a display area.

FIG. 6 is an explanatory diagram of movement of a display area.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ultrasonic image diagnostic apparatus 2 Ultrasonic probe 4 Electronic scanning part 6 Line buffer memory 7 Frame memory 10 Transfer address generator 11 Offset generator 12 Adder 13 Adder

Claims (1)

(57) [Claims] 1. A line memory for storing sound ray data, a frame memory for storing image data, a read address for reading data from the line memory, and a write address for writing the data to the frame memory. In an ultrasonic diagnostic imaging apparatus having a transfer address generating unit and a display unit for reading and displaying data in the frame memory, a line offset amount calculated according to a set display depth and a scan line angle is determined by the transfer address. Read address changing means for adding the read address output from the generating means to the read address to the line memory; and a horizontal offset amount calculated according to the set display depth and scan line angle as the transfer address. The addition of the write address output from the generating means to the frame An ultrasonic diagnostic imaging apparatus to which a write address changing means for writing an address to a memory is added.