JPS58206725A - X-ray fluoroscopy method and apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a Xa fluoroscopic imaging method and apparatus.

In a method in which all imaging conditions are determined from fluoroscopic conditions, the fluoroscopic conditions change for the same subject depending on the size of the mask opening in the diaphragm device. This means that
This becomes a source of error in determining shooting conditions.

For convenience, referring to FIG. 1 of the attached drawings, fluoroscopic conditions suitable for the rainbow subject I4 are determined by the brightness automatic adjustment circuit 21, and set by the fluoroscopic condition setter 11F. At this time, the aperture 13 of the aperture device t13 is
A is used. Here, even if the subject is the same, when the aperture 13A is closed for the above purpose, the brightness automatic adjustment circuit 2
1, the perspective conditions change. Therefore, there is a problem that the same imaging conditions cannot be obtained for the same subject.

The purpose of the present invention is to solve the above problems,
An object of the present invention is to provide an X-ray fluoroscopic imaging method and apparatus that can obtain correct imaging conditions for the same subject without being affected by the size of a mask. This objective of the method is achieved by distinguishing between the mask part and the mask opening using the video signal of the television camera during fluoroscopy, and by applying correction to the fluoroscopy condition determining circuit according to the size of the opening. . In addition, the purpose of the device is to provide a comparator between the TV camera and automatic brightness adjuster.
This is achieved by connecting the mask aperture timetable and correction signal generator in the aperture device, or by switching the output of the correction signal generator to the imaging condition setting device.

According to the first embodiment of the present invention, the fluoroscopic imaging device h
′ is according to the fluoroscopy conditions (11FC fluoroscopy tube voltage, tube current),
A mechanism is used to determine the imaging conditions (photographing tube voltage, tube current, time).

Next, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. 1
1 F is a fluoroscopy condition setter, 11 R is an imaging condition setter,
12 is an X-ray tube, 13 is an aperture device, 13A is an aperture, 14i
d object, 15 is an image intensifier, 16
17 is a monitor television, 18 is a comparator, 19 is a time measurement circuit, 20 is a correction signal generation circuit, and 21 is an automatic brightness adjustment circuit.

According to the present invention, the video signal from the television camera 16 can be detected by the comparator 1 to determine the degree of closure of the aperture 13A (mask).
8. A correction processing circuit consisting of a time measurement circuit 19 and a correction signal generation circuit 20 performs l:9 determination, and its output is applied to a conventional brightness automatic adjustment circuit 21 to determine perspective conditions. Then, the video signal of the predetermined scanning line is taken into the comparator 18 and compared with a separately determined mask discrimination level value.

This state is shown in FIG. 2. ρA is the screen of the television camera 17. Is B the video signal of scanning still 4 using the 5th example? show. Here, T is the opening of the mask J
t/4, and To is the full width period of the L-th scanning line.

If the embodiment shown in FIG.
The ratio (T/To) is required. That is, when the mask is fully open, the coverage ratio of the mask is determined as if, and the imaging conditions are determined using this as a correction value.If the subject is the same, the same imaging conditions are always used.

Adding correction to the perspective condition determining mechanism As explained above, the first
As shown by the dotted line in the figure, the same result can be obtained even if it is added to the imaging condition setting device 11R. In this case, imaging conditions are determined from the fluoroscopic conditions, and corrections are made to these. Further, although the width is set when the Tok is fully opened, it may be made to correspond to the width of film division during photographing.

? Even when the lens is stopped down, the perspective condition does not shift to the front side of the thick line, the television image does not become brighter, and the effect is that a constant perspective condition can always be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention shown together with a known example, and FIG. 2 shows a television picture 111J at A.
B shows a video signal according to the present invention. 11 F is fluoroscopy condition setter, llR is imaging condition setter 1
3 is an aperture device, 16 is a television camera, 18 is a comparator, 19 is a T time measuring circuit, and 20 is a correction signal generating circuit. Patent applicant: Shimadzu Corporation Figure 1, Figure 2, 7 Procedural amendment (method) % formula % ■, small incident indication Patent application 1989-0895602, title of the invention X-ray fluoroscopy method and apparatus 3, amendment Relationship with the case involving the person who filed the patent application Address of the patent applicant: 37 Roots Funatocho, Nijo-shita, Kawaramachi-dori, Nakagyo-ku, Kyoto City
Address 8 Name: Urazu Seisakusho Co., Ltd. Representative Setsu Yokochi, male 4, agent 06-305-40336, subject of amendment Section 7 of "Brief explanation of drawings", content of amendment

Claims (1)

[Scope of Claims] (-) In the transparent state of the subject through the aperture device, the mask coverage is determined based on the video signal of the predetermined scanning line of the television camera and a separately determined mask discrimination level value. An X-ray fluoroscopic imaging method characterized in that the imaging conditions for the same subject are determined as all correction terms. (d) Fluoroscopic condition setting device, imaging condition setting device, x y4 t
@・In an X-ray fluoroscopic imaging device equipped with an aperture device, a television camera, a monitor television, and an automatic brightness adjuster, there is a comparator between the television camera and the automatic brightness adjuster, and a mask opening adjustment device in the aperture device. XIvil fluoroscopic imaging device i, characterized in that a timetable side device and a correction signal generator are connected. (3) An X-ray fluoroscopic imaging device ρ in the range of I+·611ζ two images, characterized in that the output of the correction signal generator is switched to the imaging condition determiner