GB679617A - Improvements in or relating to x-ray apparatus - Google Patents
Improvements in or relating to x-ray apparatusInfo
- Publication number
- GB679617A GB679617A GB21595/48A GB2159548A GB679617A GB 679617 A GB679617 A GB 679617A GB 21595/48 A GB21595/48 A GB 21595/48A GB 2159548 A GB2159548 A GB 2159548A GB 679617 A GB679617 A GB 679617A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ray
- disc
- tube
- period
- pulse
- 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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B42/00—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
- G03B42/02—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means using X-rays
- G03B42/021—Apparatus for direct X-ray cinematography
- G03B42/023—Apparatus for indirect X-ray cinematography, i.e. by taking pictures on ordinary film from the images on the fluorescent screen
Abstract
679,617. X-ray apparatus. WESTING- HOUSE ELECTRIC INTERNATIONAL CO. Aug. 16, 1948 [Sept. 27, 1947], No. 21595/48. Class 98 (i). In X-ray apparatus for displaying images of moving objects on a fluorescent screen having a long persistence of after-glow and of a type exhibiting a short time luminosity component as hereinafter defined, and comprising a source of X-rays, a fluorescent screen and an optical system through which light from the fluorescent screen passes, the source of X-rays is controlled to produce an X-ray pulse or pulses, the duration of which or each of which is not greater than the phosphorescent period (as hereinafter defined) of the short time luminosity component of the screen and the optical system includes means for permitting the light from the screen to be passed only during a time period or periods synchronized with the X-ray pulse or pulses. It is stated that certain fluorescent materials, notably fluorescent sulphides such as zinc sulphide, which give a high intensity of fluorescense, exhibit on stimulation an intensity of light which varies as if it comprised two components increasing exponentially with time. One component, defined as the short time luminosity component, increases much more quickly than the other, and the time after which it reaches 1/e of its theoretical maximum is defined as its phosphorescent period. The other component produces blurring effects in X-ray kinematography, which are to be eliminated. It is stated that the variation of intensity may also be regarded as comprising more than two components, and that the components need not be exponential in form. As shown, the X-ray tube 1 is connected in series with a gas-discharge tube 7 and a condenser 11 charged to a high potential by a conventional rectified current supply. The tube 7 is normally maintained non-conductive by a battery 8 which applies negative potential through a resistance to a trigger electrode. A camera 4 has a lens system between the elements of which a conductive disc 18 is rotated by a motor which may also drive mechanism for moving film intermittently through the camera. Disc 18 has diametrically opposite projectors 17 and apertures 24, 25, so arranged that at the moment when an aperture registers with the lens, a projection 17 wipes a brush 16, completing a circuit from a battery 15, brush 16, projection 17, through disc 18 to a brush 19 wiping the disc continuously, to the primary winding 14 of a transformer. The make-andbreak of this circuit produce pulses in the transformer secondary 13, and the positive-going pulse is applied, through condenser 12, to the trigger electrode. Tube 7 is thus rendered conductive and condenser 11 is discharged therethrough and through tube 1, producing a short pulse of X-rays which pass through a body 3 to form an image on a fluorescent screen 2. The pulse of X-rays may last from 1 to 100 microseconds, and the shutter may be open for the same period or for a slightly longer or short period, according to requirements. In an alternative arrangement, the gas-discharge tube is placed in the filament circuit of the X-ray tube. When the discharge tube is rendered conductive, a condenser discharges through the filament raising it to incandescence for a short period to permit X-ray emission. The film may be moved continuously through the camera 4, which is then provided with a tilting lens or mirror system. The disc shutter may be replaced by an electromagnetically-operated reciprocating shutter which may be operated in synchronism with the current pulses. The taking of the photographs may be synchronized with the A.C. supply frequency by driving disc 18 by a synchronous motor and using the alternating voltage to trigger the discharge tube. The image, instead of being photographed, may be viewed through an eyepiece.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US679617XA | 1947-09-27 | 1947-09-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB679617A true GB679617A (en) | 1952-09-24 |
Family
ID=22079552
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB21595/48A Expired GB679617A (en) | 1947-09-27 | 1948-08-16 | Improvements in or relating to x-ray apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB679617A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007038306A3 (en) * | 2005-09-23 | 2007-10-25 | Univ North Carolina | Methods, systems, and computer program products for multiplexing computed tomography |
US8155262B2 (en) | 2005-04-25 | 2012-04-10 | The University Of North Carolina At Chapel Hill | Methods, systems, and computer program products for multiplexing computed tomography |
US8189893B2 (en) | 2006-05-19 | 2012-05-29 | The University Of North Carolina At Chapel Hill | Methods, systems, and computer program products for binary multiplexing x-ray radiography |
US8358739B2 (en) | 2010-09-03 | 2013-01-22 | The University Of North Carolina At Chapel Hill | Systems and methods for temporal multiplexing X-ray imaging |
US8600003B2 (en) | 2009-01-16 | 2013-12-03 | The University Of North Carolina At Chapel Hill | Compact microbeam radiation therapy systems and methods for cancer treatment and research |
US10835199B2 (en) | 2016-02-01 | 2020-11-17 | The University Of North Carolina At Chapel Hill | Optical geometry calibration devices, systems, and related methods for three dimensional x-ray imaging |
US10980494B2 (en) | 2014-10-20 | 2021-04-20 | The University Of North Carolina At Chapel Hill | Systems and related methods for stationary digital chest tomosynthesis (s-DCT) imaging |
-
1948
- 1948-08-16 GB GB21595/48A patent/GB679617A/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8155262B2 (en) | 2005-04-25 | 2012-04-10 | The University Of North Carolina At Chapel Hill | Methods, systems, and computer program products for multiplexing computed tomography |
WO2007038306A3 (en) * | 2005-09-23 | 2007-10-25 | Univ North Carolina | Methods, systems, and computer program products for multiplexing computed tomography |
CN101313214B (en) * | 2005-09-23 | 2013-03-06 | 北卡罗来纳大学查珀尔希尔分校 | Methods, and systems for multiplexing computed tomography |
US8189893B2 (en) | 2006-05-19 | 2012-05-29 | The University Of North Carolina At Chapel Hill | Methods, systems, and computer program products for binary multiplexing x-ray radiography |
US8600003B2 (en) | 2009-01-16 | 2013-12-03 | The University Of North Carolina At Chapel Hill | Compact microbeam radiation therapy systems and methods for cancer treatment and research |
US8995608B2 (en) | 2009-01-16 | 2015-03-31 | The University Of North Carolina At Chapel Hill | Compact microbeam radiation therapy systems and methods for cancer treatment and research |
US8358739B2 (en) | 2010-09-03 | 2013-01-22 | The University Of North Carolina At Chapel Hill | Systems and methods for temporal multiplexing X-ray imaging |
US10980494B2 (en) | 2014-10-20 | 2021-04-20 | The University Of North Carolina At Chapel Hill | Systems and related methods for stationary digital chest tomosynthesis (s-DCT) imaging |
US10835199B2 (en) | 2016-02-01 | 2020-11-17 | The University Of North Carolina At Chapel Hill | Optical geometry calibration devices, systems, and related methods for three dimensional x-ray imaging |
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