GB1287825A - - Google Patents
Info
- Publication number
- GB1287825A GB1287825A GB4192770A GB4192770A GB1287825A GB 1287825 A GB1287825 A GB 1287825A GB 4192770 A GB4192770 A GB 4192770A GB 4192770 A GB4192770 A GB 4192770A GB 1287825 A GB1287825 A GB 1287825A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- amplifier
- exposure
- brightness control
- output
- 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.)
- Expired
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
- H05G1/58—Switching arrangements for changing-over from one mode of operation to another, e.g. from radioscopy to radiography, from radioscopy to irradiation or from one tube voltage to another
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
-
- 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
- H05G1/36—Temperature of anode; Brightness of image power
-
- 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)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- X-Ray Techniques (AREA)
Abstract
1287825 Automatic brightness control C G R MEDICAL CORP 2 Sept 1970 [24 Sept 1969] 41927/70 Heading G3R [Also in Divisions G1 and H3] X-ray tube control circuit for exposure or brightness control in x-ray radiography, fluoroscopy or cine, includes means for selecting one of a plurality of x-ray detectors and connecting it to an operational amplifier which is provided with means whereby it may operate in an integration mode for exposure termination or in a signal amplifier mode for brightness control. Detectors may be photo-multipliers 10, 20, 30, one of which is selected by closing of switch 11, 21 or 31, which might be controlled by external logic circuitry, punched cards, tape &c. Resultant conduction of e.g. transistor 12 causes potentiometer 13, which is set to a position appropriate to the particular use and location of detector 10, to deliver current at an appropriate value to amplifier 41, 42 and inverter 40, which delivers the photo-multiplier 10 supply voltage at the required value. If this same voltage is also supplied to the other detectors 20, 30 these are shielded so as to have negligible output. Closing of switch 11 also results in conduction of transistor 17 via zener 15 and diode 16, thereby coupling the detector 10 output to the operational amplifier 50. This comprises differential arrangement 51, 52 feeding transistors 53, 54 in cascade. Feedback via capacitor 56 provides for the integration mode. The setting of 71 determines the voltage at which transistor 72 will conduct to terminate the exposure (70). Exposure is initiated via gating transistor arrangement 91, 92. For brightness control purposes, typically in fluoroscopy and cine, switch 61 is closed to provide the signal amplifier mode. This causes feedback via resistor 59 and capacitor 59 through transistor 62 to the amplifier input at 51. The output of the amplifier 50 is used at 80. Switching in of this shunt R.C. circuit provides facility for following steady state variations up to a few cycles and then smoothing. Typical locations for the tubes are: adjacent a scintillator (in radiography); coupled to image-intensifier output phospher; at spotfilm device; under x-ray table.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US86060369A | 1969-09-24 | 1969-09-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1287825A true GB1287825A (en) | 1972-09-06 |
Family
ID=25333590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4192770A Expired GB1287825A (en) | 1969-09-24 | 1970-09-02 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3675020A (en) |
| FR (1) | FR2062548A5 (en) |
| GB (1) | GB1287825A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2154539C3 (en) * | 1971-11-03 | 1974-10-10 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Automatic exposure circuit of an X-ray diagnostic apparatus |
| FR2168849B1 (en) * | 1972-01-24 | 1976-09-03 | Schlumberger Prospection | |
| US4171484A (en) * | 1977-08-03 | 1979-10-16 | Diagnostic Information | Automatic brightness control for direct view fluoroscopic imaging systems |
| FR2516338A1 (en) * | 1981-11-09 | 1983-05-13 | Tardivet Marc | Exposure control appts. for X=ray generator - has three separate photomultipliers for image amplification and compensated charging capacitor in signal monitoring circuit |
| JPH0453765Y2 (en) * | 1985-09-02 | 1992-12-17 | ||
| DE3600464A1 (en) * | 1986-01-10 | 1987-07-16 | Philips Patentverwaltung | X-RAY GENERATOR WITH DOSAGE PERFORMANCE CONTROL |
| US4856036A (en) * | 1986-05-15 | 1989-08-08 | Xi Tech Inc. | Method for production of fluoroscopic and radiographic x-ray images and hand held diagnostic apparatus incorporating the same |
| US4993404A (en) * | 1989-06-26 | 1991-02-19 | Lane Timothy G | Fluoroscopy switching device |
| US5127394A (en) * | 1989-06-26 | 1992-07-07 | Tilane Corporation | Fluoroscopy switching device |
| US6368269B1 (en) | 1993-05-20 | 2002-04-09 | Tilane Corporation | Apparatus for concurrent actuation of multiple foot pedal operated switches |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL98123C (en) * | 1953-03-03 | 1961-06-15 | Philips Nv | Device for producing X-ray images, in which an indicator for measuring the X-ray intensity is arranged behind the object to be photographed |
| US2962594A (en) * | 1956-09-14 | 1960-11-29 | Westinghouse Electric Corp | X-ray apparatus |
| US3109093A (en) * | 1961-01-31 | 1963-10-29 | Lab For Electronics Inc | Apparatus for coordinating camera shutter movement with a pulsed X-ray beam |
| US3491239A (en) * | 1965-09-22 | 1970-01-20 | Gen Electric | X-ray image amplifier system with automatic exposure control |
-
1969
- 1969-09-24 US US860603A patent/US3675020A/en not_active Expired - Lifetime
-
1970
- 1970-09-02 GB GB4192770A patent/GB1287825A/en not_active Expired
- 1970-09-23 FR FR7034464A patent/FR2062548A5/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US3675020A (en) | 1972-07-04 |
| FR2062548A5 (en) | 1971-06-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |