JPS58131877A - X-ray television device - Google Patents

Abstract

PURPOSE:To prevent deterioration of a picture and to make the picture easily visible, by providing an image intensifier which switches the area of a detection field inputting an X-ray image to 1:4, picking up an output fluorescent image on a TV camera, and displaying the image on a monitor TV. CONSTITUTION:In picking up the X-ray image of an objective, the X-ray image is converted into a fluorescent image by using the image intensifier (I.I) which switches the area of a detection field at the input side to 1:4. The fluorescent image is picked up at a TV camera(TC) and the X-ray transmission image is displayed on the TV monitor(TM). In case of entire pickup, the detection field 10A of the I.I covers most of a film FLM and the fluorescent image 11 obtained at the output of the I.I is formed on a photoelectric conductor plane 12 of the pickup tube of the TC. The vertical scanning range is scanned in the scanning range 13 equal to a diameter of the image forming circular image, and the X-ray transmission image is obtained on a CRT14 of the MT having equal horizontal to vertical scanning ratio to the range 13. In case of four-split pickup, the detection field of the I.I is switched and the four split image is displayed on the CRT14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention belongs to the technical field of diagnostic medical equipment, and particularly to the technical field of X-ray imaging devices.

[Technical background of the invention and its problems]

Conventionally, compared to X-ray imaging devices, for example, in an X-ray television device, when taking an X-ray photograph, the target region of the subject to be photographed is displayed on a display device, such as a television, and monitored. It is common to check. Such an X-ray television device includes an X-ray tube, as shown in FIG.
A POX fluoroscopic image of the subject using X-rays emitted from T.
The input fluorescent surface FlrN of the image intensifier (hereinafter sometimes abbreviated as "technical") converts it into a fluorescent image, and this fluorescent C image is appropriately amplified and enlarged to output Iφ■. The output fluorescent image is captured by a television camera TC via an optical system OP, and the video signal is sent to a CRT monitor M via a television camera controller CC.
After being transferred to the CRT monitor MT, the X-ray fluoroscopic image is displayed on the CRT monitor MT.

Furthermore, when taking an X-ray photograph, a spot film device SFD is attached to the X-ray television device.

That is, the spot film device SFD receives the grid GRD and the divided mask SEP from the input side of the X-ray transmission image.

It is constructed by arranging two intensifying screens SCR and an X-ray film FLM (hereinafter sometimes simply referred to as film FLM) sandwiched between the intensifying screens SCR in parallel.

The film FLM used to take X-ray photographs is
Normally, the film FLM is cut in half, but this four-cut size is expensive, and one film FLM is expensive.
Due to the need to compare and observe multiple captured images,
Recently, a divisional imaging method has been introduced in which a single quarter-sized film FLM is divided into blocks of appropriate size and an X-ray transmitted image is projected at each division position. Split shooting, left and right split shooting, and quadrant shooting are being performed. For example, if you want to take a full-screen shot,
As shown in Figure (α), since the output fluorescent image from the 9-inch I (letter char) H attached to the input surface of the spot film device SFD is circular, the circular photoconductor of the image pickup tube of the television camera TC is Furthermore, the scanning of the television camera TC is performed in a substantially square scanning range (horizontal to vertical) circumscribing the imaged circular image 1. The scanning ratio is 1:1). Therefore, when displaying on the CRT monitor MT, since the scanning area other than the output image of I-I is unnecessary, the image shown in FIG. As shown in (b), a display range limiting mask 3 that does not transmit light is attached to the cathode ray tube 2 of the CRT monitor, so that an X-ray fluoroscopic image can be observed through the central circular window 4 of the display range limiting mask 6. It has become. In addition, when shooting in four parts, use the spot film device SF.
The opening area of the divided mask SEP in D is set to 1/4 of the quarter-cut film FLM, and the opening of the divided mask SEP (the hatched part in the figure) is cut into quarters, as shown in FIG. 3 (α). The image forming circular image 1 on the image pickup tube of the television camera TC, which projects the output fluorescent image outputted from I-I, is scanned in the same manner as in the case of full-surface photography, by aligning it with the predetermined position of the film FLM. , as shown in Figure 6(b),
An X-ray fluoroscopic image is displayed on the cathode ray tube 2 of the CRT monitor MT. In addition, in FIG. 3 (6), the part indicated by 5 is the part to which blanking processing has been performed. In such a display method using the CRT monitor MT, the X-ray fluoroscopic image is displayed only as a very small image on the effective screen of the cathode ray tube 2.

Therefore, the X-ray fluoroscopic image displayed on the cathode ray tube 2 of the CRT monitor MT is very difficult to see.

In order to improve this, the following display method has been proposed.

In other words, in the case of full-screen photography, the scanning range on the image pickup tube of the television camera TC is adjusted so that the horizontal to vertical scanning ratio is 5:6, and the horizontal scanning range is adjusted to the image forming circular image 1 on the image pickup tube. CR
For example, set the size of the cathode ray tube of T-Monitor MT to 310X.
By setting the ratio to 220 m-(6:5) and using this cathode ray tube in a vertically elongated manner, the entire effective screen of the cathode ray tube is used to display an X-ray fluoroscopic image, as shown in FIG.

In addition, in the case of quadrant photography, the scanning range of the image pickup tube of the television camera TC is set to the imaged circular image 1 shown in Fig. 3 (,).
(In this case, the scanning range is 1/4 of the quarter-cut size, so the horizontal to vertical scanning ratio is 5:6.), and the cathode ray tube is used vertically. Then, display it as shown in Figure 4. In this way, the photographing range on the film FLM during quadrant photography matches the image display range on the cathode ray tube 2 of the CRT monitor MT, and it is possible to eliminate the difficulty in viewing due to the small image display range. In addition, the images in fluoroscopic diagnosis and film diagnosis are identical, and the accuracy of diagnosis can be improved. However, in the display method described above, the TV camera TC Since the scanning range of the image pickup tube changes, the imaging characteristics change and the X-ray quantum noise also changes. In other words, when the scanning range is made smaller as in the case of quadrant imaging, there is a drawback that the afterimage in the image pickup tube is reduced, X-ray quantum noise becomes noticeable, and the image deteriorates.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and it is possible to make the operation range on the film coincide with the image display range on the display device without changing the residual characteristics of the image pickup tube. It is an object of the present invention to provide an X-ray television device that does not cause deterioration of the image quality and provides easy-to-see images.

[Summary of the invention]

The outline of the present invention for achieving the above object is that when an X-ray image is captured on an X-ray film by arranging a K X-ray tube and an X-ray film in front and behind a subject, the In an X-ray television device that displays an X-ray fluoroscopic image on a television monitor by converting it into a fluorescent image and capturing this fluorescent image with a television camera, the area of the detector that inputs the X-ray image is Image intensity and fire switchable to 1:4, horizontal to vertical scanning ratio for scanning when capturing the output fluorescence image of the image intensifier, and scanning when displaying the X-ray fluoroscopic image. The present invention is characterized by comprising a television camera and a television monitor that have the same horizontal to vertical scanning ratio and the same scanning range of the output fluorescent image regardless of whether the detector area is changed. be.

[Embodiments of the invention]

The difference between the X-ray television apparatus which is an embodiment of the present invention and the conventional X-ray television apparatus shown in FIG. 1 is that the diameter of the circular detection field on the input side can be varied to double or half. Use a method that allows the area of the detector to be changed to 1:4, and TV camera TC.
A circular image is formed on the circular photoconductive surface of the image pickup tube inside the
A television camera T that scans so that the vertical direction of the scan range is equal to the diameter of the imaged circular image and the horizontal-to-vertical scan ratio is equal to the ratio of the horizontal to vertical lengths of the film.
C and the horizontal to vertical scan ratio of the film F
A cathode ray tube whose ratio of the horizontal length to the vertical length of the LM is equal is used as the CRT monitor MT.

Usually, the size of a quarter-cut film FLM is 12 inches in width and 10 inches in length (length-to-width length ratio: 6:5').

Next, we will discuss the operation of the X-ray television apparatus according to the present invention using 12'/9'/(S"I-I), which can vary the diameter of the circular detection field between 12 inches and 6 inches. state

First, in the case of full-scale photography, use 12#/9γ6' I fist.
When set to 2' mode, as shown in Figure 5 (α), 12
The γ9γ6'I-I detector 10A can cover most of the film FLM. And 12γ9γ6
Figure 5 (6) K
An output fluorescent image 11 as shown is formed. This output fluorescent image 11 is projected onto the photoconductive surface 12 of the image pickup tube of the television camera TC via the optical system OP, as shown in FIG. 5(b), to form a circular image. The imaging tube of the television camera TC has a vertical scanning range on its photoconductive surface 12 equal to the diameter of the imaged circular image and a horizontal-to-vertical scanning ratio of 5:
Scanning is performed in a scanning range 13 such that 6. The video signal obtained by scanning is transferred to the CRT monitor MT, and an X-ray fluoroscopic image is displayed on the cathode ray tube 14 of the CRT monitor MT. At that time, the ratio of the horizontal length to the vertical length of the cathode ray tube 14 is set to 5.
= 6, that is, if the horizontal to vertical scanning ratio is 5 = 6, an image that is almost the same as the output fluorescent image or imaged circular image will be displayed as an X-ray fluoroscopic image that fills the cathode ray tube, as shown in Figure 7 (,). will be displayed as .

On the other hand, in the case of quadrant shooting, 127976'I・I is 6'
mode. This switching is 12γ976'
This can be done by a switch (not shown) that is linked to I/E. In the 6' mode, as shown in FIG. 6(, ), the 1279γ6' I/F detector 10B can cover about 1/4 of the area of the film FLM. Moreover, the 6' mode detection field 10B covers 1/4 area of the film FLM in the same manner as the 12' mode detection field 10A for the film FLM in the case of full-screen photography. And 12'/976'I・■
An output fluorescent image 11 as shown in FIG. 6(b) is formed on the output fluorescent surface FOUT. The size of this output fluorescent image 11 is the same as the size of the output fluorescent image 11 in the case of full-surface photography. This output fluorescent image 11 is then output from the optical system OP.
to the photoconductive surface 12 of the image pickup tube of the television camera TC via the
It is projected as shown in FIG. 6 (6) to form a circular image.

The size of this formed circular image is the same as the size of the formed circular image in the case of full-plane imaging. The imaging tube of the television camera TC scans the photoconductive surface 12 over the same scanning range 13 as in the case of full-surface photography. Since the scanning range is the same as in the case of full-plane imaging (horizontal to vertical scanning ratio; s: 6), the imaging characteristics remain unchanged and image deterioration due to X-ray quantum noise can be prevented.

The video signal obtained by scanning is transferred to the CRT monitor MT, and as shown in FIG. 7(b), an image almost identical to the output fluorescent image or the formed circular image is displayed on the cathode ray tube 14 as an X-ray fluoroscopic image. Displayed as 0 As mentioned above, the scanning area of the TV camera TC does not change whether it is shooting the entire area or shooting in four parts.
The image photographed on the film FLM and the image displayed on the CRT monitor MT can be matched, and the image can be displayed to fill the cathode ray tube, thereby preventing failure to record parts necessary for diagnosis. Furthermore, since there is no deterioration of the image displayed on the cathode ray tube, it is possible to accurately monitor the image. Various modifications can be made within the scope of the gist.

The image intensifier in this invention only needs to be able to vary its detector area by 1:4, and in addition to 12γ9γ6'IφI in the above embodiment, 14
77'II construction can also be used. The size of the film in this invention is also adjusted to the detection field of 14'X1 when using 14γ7'I.
A 1' film or a 14' x 14' film can be suitably used. In this case as well, the television camera T
The scanning range of C is the same for both full-plane photography and quadrant photography.

〔Effect of the invention〕

According to the invention described in detail above, the following effects can be achieved. In other words, if the I-I detector area for full-screen imaging is 1, then the I-I detector area for quadrant imaging is 1/4. Since this method is used, the scanning range when scanning the output fluorescent image from I.I with a television camera can be made the same for both full-plane photography and quadrant photography. Therefore, even if the mode is switched between full-screen photography and quadrant photography, there is no change in the afterimage characteristics of the image pickup tube in the television camera, and it is possible to prevent image deterioration due to changes in X-ray quantum noise. .

Also, the horizontal to vertical scan ratio and CR of a television camera.
Since the horizontal to vertical scanning ratio when displaying an X-ray transmitted image on a T monitor is the same, the X-ray transmitted image can be displayed on the entire screen of a CRT monitor, making it very easy to monitor. Easy and accurate monitoring

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing a conventional X-ray television device, and Figure 2 (
α) is an explanatory diagram showing the correspondence between the X-ray film and the output fluorescent image or imaged circular image of I-I in full-scale imaging, and Fig. 2(b) is an X-ray fluorograph on a CRT monitor during full-scale imaging. An explanatory diagram showing the image, Figure 3 (cL) is an explanatory diagram showing the correspondence between the X-ray film in quadrant photography and the output fluorescent image or imaged circular image of ■I, Figure 3 (b) and the fourth
The figure is an explanatory diagram showing an X-ray fluoroscopic image on a CRT monitor during quadrant imaging, and Figure 5 (,) shows the correspondence between the X-ray film and the detection field of An explanatory diagram, FIG. 5(b), is an explanatory diagram showing the correspondence relationship between the output fluorescent image, its X-ray film, and the detection fields of ■ and ■ in this invention, and FIGS. 7(α) and (h) are FIG. 2 is an explanatory diagram showing a CRT monitor that displays an X-ray fluoroscopic image. XT...X-ray tube, FLM...X-ray film,
■・■・・・Image intensifier, TC...
・TV camera, MT...TV monitor (CRT monitor), 1QA, 10B...detection field, 11...
Output fluorescent image, 12... photoconductive surface, 16... scanning range, 14... cathode ray tube. Agent Patent Attorney Noriyuki Kensuke Chika (and 1 other person) Figure 2 (0) ', 1 (G) ゞFLM Condolence 5 Figure 6 Figure 6 (0) (b) lI4 υ 1 Ni: 4 (b) ) (G) 14 (b) \ 4 467

Claims (1)

[Claims] When an X-ray tube and an X-ray film are placed in front and behind the subject and an X-ray image is captured on the X-ray film, the X-ray image is converted into a fluorescent image by an image intensifier, and this fluorescent image is In an X-ray television device that displays an X-ray fluoroscopic image on a television monitor by capturing the image with a television camera, an image intensifier that can switch the area before detection to which the X-ray image is inputted to 1 = 4; The horizontal-to-vertical scanning ratio used when capturing the output fluorescent image of the intensifier is the same as the horizontal-to-vertical scanning ratio used when displaying the X-ray fluoroscopic image, and the area before detection is An X-ray television apparatus comprising a television camera and a television monitor whose output fluorescent image scans the same range regardless of switching.