JPS56168399A - X-ray photographic equipment - Google Patents
X-ray photographic equipmentInfo
- Publication number
- JPS56168399A JPS56168399A JP7360980A JP7360980A JPS56168399A JP S56168399 A JPS56168399 A JP S56168399A JP 7360980 A JP7360980 A JP 7360980A JP 7360980 A JP7360980 A JP 7360980A JP S56168399 A JPS56168399 A JP S56168399A
- Authority
- JP
- Japan
- Prior art keywords
- light
- photodetectors
- output
- average value
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
- H05G1/08—Electrical details
- H05G1/26—Measuring, controlling or protecting
- H05G1/30—Controlling
- H05G1/38—Exposure time
- H05G1/42—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube
- H05G1/44—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube in which the switching instant is determined by measuring the amount of radiation directly
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- X-Ray Techniques (AREA)
Abstract
PURPOSE:To ensure a proper exposure time even when there are abnormally light and dark places by arranging a number of photoelectric detectors which detects the brightness of a phosphor screen and driving a photo-timer depending upon the average value of these output. CONSTITUTION:An X-ray irradiated from an X-ray tube 3 passes through a subject 4, exposes a film 6, and is converted into light by an image tube 7 behind it. A part of the output of the image tube 7 is taken out by a mirror 8 and detected by a number of photodetectors which scatter. The photocurrent of these photodetectors enters a compare circuit 18 and is compared with the voltage from a voltage setting device 25 with a width which is assumed in a normal photographic condition. When there is an abnormally light (dark) place, switches 29 and 30 are opened. As a result, the average value of the outputs from the photodetectors which detect normal light is output from an average value circuit 34 and these outputs are integrated by an integration circuit 36. When this integration value exceeds a specified value, a high voltage generator 2 is stopped.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7360980A JPS56168399A (en) | 1980-05-30 | 1980-05-30 | X-ray photographic equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7360980A JPS56168399A (en) | 1980-05-30 | 1980-05-30 | X-ray photographic equipment |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56168399A true JPS56168399A (en) | 1981-12-24 |
Family
ID=13523239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7360980A Pending JPS56168399A (en) | 1980-05-30 | 1980-05-30 | X-ray photographic equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56168399A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57202100A (en) * | 1981-06-04 | 1982-12-10 | Hitachi Medical Corp | X-ray automatic exposure detecting unit |
JPS58160946A (en) * | 1982-03-19 | 1983-09-24 | Hitachi Medical Corp | Automatic x-ray exposing device |
FR2577374A1 (en) * | 1985-02-08 | 1986-08-14 | Thomson Cgr | Method of automatic adjustment of exposure in a radiology installation and radiology installation implementing such a method |
EP0435528A2 (en) * | 1989-12-26 | 1991-07-03 | General Electric Company | X-ray system |
-
1980
- 1980-05-30 JP JP7360980A patent/JPS56168399A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57202100A (en) * | 1981-06-04 | 1982-12-10 | Hitachi Medical Corp | X-ray automatic exposure detecting unit |
JPH023279B2 (en) * | 1981-06-04 | 1990-01-23 | Hitachi Medical Corp | |
JPS58160946A (en) * | 1982-03-19 | 1983-09-24 | Hitachi Medical Corp | Automatic x-ray exposing device |
FR2577374A1 (en) * | 1985-02-08 | 1986-08-14 | Thomson Cgr | Method of automatic adjustment of exposure in a radiology installation and radiology installation implementing such a method |
EP0435528A2 (en) * | 1989-12-26 | 1991-07-03 | General Electric Company | X-ray system |
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