JPS63270030A - Digital x-ray apparatus - Google Patents

Abstract

PURPOSE:To obtain an image containing detailed data with respect to all of the areas thereof and having high diagnostic value, by applying weighting to X-ray images continuously picked up under different image pickup conditions to add the same. CONSTITUTION:The X-ray image of the subject 11 irradiated with X-rays from an X-ray tube 10 is digitized by an A/D converter 1 through a TV camera 13. At this time, two images obtained by performing the irradiation with X-rays two times at high and low voltages are respectively stored in frame memories 2, 3. For example, the high voltage picked-up image lowers in the contrast of a lung field part A and the microstructure of a heart part B is extracted. The entire region of the heart part B is erased in the low voltage picked-up image and the microstructure of the lung field part A is extracted. Hereupon, both images are increased by K-times and (1-K) times by multipliers 4, 5 to be added by an adder 6. The addition output is displayed on a TV monitor as an image uniformly containing the microstructures of both areas by a D/A converter 7.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is used in the field of medical X-ray equipment and image processing.

The present invention relates to a digital X-ray device, and more specifically, the present invention relates to a digital X-ray device, and more specifically, an image intensifier (+, 1.) and an Regarding digital X-ray equipment.

(b) Prior art As mentioned above, an image intensifier (1,
1,) and an analog X-ray image (an elephant is digitized by an A/D converter and stored in a frame memory, obtained through an X-ray TV device, and then a digital image obtained by performing calculations etc. to obtain the desired image (elephant) The process is well known.

(c) Problems to be Solved by the Invention By the way, in a subject with a wide dynamic range such as the chest, X-ray absorption is small in the lung area, while it is very large in the heart area.

Therefore, in low tube voltage imaging, contrast in the lung field is good, but fine shadows in the heart are completely lost.

On the other hand, with high tube voltage photography, you can see very little of the heart! Although the ll structure is extracted, the contrast in the lung field becomes extremely poor.

In conventional imaging methods, for a chest where the lung field and the heart region overlap, one of the images must be selected at the expense of the other.

In particular, in the lungs, there are blood vessels, bronchi, intestines, etc., and the shadows of these are necessary for diagnosis in relation to the heart, and there is a need for image interpretation of both parts displayed at the same time.

As exemplified above, an object of the present invention is to provide an X-ray digital apparatus that can obtain images with high diagnostic value that include detailed information about all parts of a subject even in a wide dynamic range.

(d) Means for solving the problem The above-mentioned purpose is to provide a digital X-ray device with a digital image processing function that stores a plurality of This is achieved by comprising a frame memory, an adder that adds a unique weight to each frame memory and adds up all the frame memories, and display means for displaying the addition output.

(E) Effect: Under different shooting conditions, for example, high tube voltage shooting and fuze voltage setting, multiple consecutive shots are taken, stored in each frame memory, and an appropriate weight is assigned to each of these frame memories. are multiplied and added, and one image is displayed as the final image.

(f) Implementation example Preferred embodiments of the invention are explained on the basis of the drawings.

FIG. 1 is a block diagram of the main part configuration of one embodiment.

In this figure, 1 is an A/D converter, 2 and 3 are frame memories, 4 and 5 are power KW, 6 is an adder, 7 is a D/A converter, 8 is a TV monitor, IO is an X-ray tube, 11 is the subject, 1
2 is the image intensifier ([,1,),13
is a TV camera.

X-rays are emitted by the X-ray tube 10, and the X-ray image transmitted through the subject 11 is output as an analog video signal via 1.1.12 and the TV right camera 3.

This video signal is digitized by the A/D converter 1.

In the illustrated embodiment, high-voltage imaging and low-voltage 1st shadow are successively performed by irradiating X-rays twice at high tube voltage and low tube voltage.

Of the two images obtained by the two X-ray irradiations, the high-voltage @shadow image is stored in the frame memory 2, and the low-voltage IJl'U image is stored in the frame memory 3.

For example, when photographing the chest, in a high-pressure shadow image, the contrast in the lung area A decreases as shown in FIG. 2(a), but the fine structure in the heart area B is well extracted.

Further, in the low-pressure photographed image, as shown in FIG. 2(b), the heart region B is completely collapsed with a black level, but the fine structure in the lung region A is well extracted.

According to this embodiment, both images are multiplied by (1-K) in a multiplier 4.5 and then added in an adder 6.

The addition output is converted into an analog signal by the D/A converter 7, and T
It is displayed on the V monitor 8.

An image obtained by simply adding 1=1 for both images is displayed as a moat uniformly containing the fine structures of both parts, as shown in FIG. 2(c).

That is, for the coefficient, K+(1-K)=1.
It is preferable that the coefficient of the multiplier can be set variably, and the operator can arbitrarily set the value of the coefficient of the multiplier to, for example, increase the proportion of high-voltage imaging images to see the heart. It is possible to see the lung field by increasing the proportion of low-pressure images.

In addition, FIG. 2(d), (e) and (f) are the same UN(a
), (b) and (C) respectively.

In the embodiment of the present invention, two images are weighted and added, but the present invention is also applicable to two or more consecutive images.

(g) vJ The area that forms the fruit has a large X-ray absorption (this and other areas that form the insect have a small A high quality image can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram illustrating images and level values showing a processing process according to the present invention. 2 is a frame memory for high-voltage i-shadow images, 3 is a frame memory for low-voltage shadow images, 4 and 5 are multipliers, and 6 is an adder. Patent applicant Shimadzu Corporation Atsushi 1 Figure 2 (d) (e) Width

Claims (1)

[Claims] A digital X-ray device that has a digital image processing function has multiple frame memories that store each X-ray image taken consecutively under different imaging conditions as a digital signal, and each frame memory has its own weight applied to all images. A digital X-ray apparatus comprising: an adder that adds up frame memories; and display means for displaying the addition output.