DE388386C - Rotary screen for shielding the image-obscuring secondary rays during X-ray exposures - Google Patents
Rotary screen for shielding the image-obscuring secondary rays during X-ray exposuresInfo
- Publication number
- DE388386C DE388386C DEZ13333D DEZ0013333D DE388386C DE 388386 C DE388386 C DE 388386C DE Z13333 D DEZ13333 D DE Z13333D DE Z0013333 D DEZ0013333 D DE Z0013333D DE 388386 C DE388386 C DE 388386C
- Authority
- DE
- Germany
- Prior art keywords
- obscuring
- image
- shielding
- rotary screen
- secondary rays
- 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
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
- G21K1/025—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Description
Rotationsblende zur Abschirmung der bildverschleiernden Sekundärstrahlen bei Röntgenaufnahmen. Zur Vermeidung der bildverschleiernden Wirkung der Sekundärstrahlen bei Röntgenaufnahmen sind Blenden verschiedenster Art vorgeschlagen worden, beispielsweise auch eine Rotationsblende, bei der der strahlenundurchlässige Stoff in Form einer Spirale angeordnet war, die mit einer besonderen sogenannten Sternblende zusammenwirkte. Bei letzterer waren die Schachtwände, vorzugsweise aus Blei, in einer Scheibe radial angeordnet, wobei diese Wände nicht bis zum Mittelpunkt der Scheibe geführt wurden, sondern so verkürzt waren, daß ihre Enden auf einer Spirale lagen. Auch ist eine Rotationsblende bekannt geworden mit einer Spirale, in der radial verlaufende Zwischenwände angeordnet waren. Bei beiden Ausführungen sollte im wesentlichen erstrebt werden, bei der Drehung der Scheibe alle Punkte der photographischen Platte gleich lange zu belichten.Rotary screen to shield the secondary rays that obscure the image for x-rays. To avoid the obscuring effect of the secondary rays Various types of diaphragms have been proposed for x-ray recordings, for example also a rotating shutter, in which the radio-opaque fabric in the form of a Spiral was arranged, which cooperated with a special so-called star aperture. In the latter, the shaft walls, preferably made of lead, were radial in a disk arranged, whereby these walls were not led to the center of the disc, but were shortened so that their ends lay on a spiral. Also is one Rotary diaphragm has become known with a spiral in the radially extending partition walls were arranged. In both versions, the main aim should be when the disk rotates, all points on the photographic plate have the same length to expose.
Bei den angegebenen Ausführungen ergeben sich -aber in der Fabrikation erhebliche Schwierigkeiten, die hauptsächlich die Bleispirale und die ungleiche Ausbildung der Schachtwände betreffen. Diese Nachteile werden gemäß der Erfindung dadurch vermieden, daß statt der -radial angeordneten im wesentlichen über ihre ganze Länge gleich dicken Schachtwände nach außen hin sich verbreiternde Keile mit vorzugsweise gleichen Ausmessungen verwendet werden, wobei die seitlichen Wandungen senkrecht zur strahlenempfindlichen Platte und radial zur Drehachse der Blende gerichtet sind, also in Ebenen liegen, die durch den Brennpunkt der Röntgenröhre gehen. Hierdurch wird bei wesentlicher Vereinfachung der Herstellung der Blende erreicht, daß sämtliche Punkte der unter der Blende liegenden photographischen Platte praktisch gleichmäßig belichtet werden mit einziger Ausnahme derjenigen, die in einem kleinen Kreise um den Mittelpunkt liegen und die im wesentlichen in den Schatten der Blendenachse fallen.In the case of the specified versions, however, result in the manufacture considerable difficulties, mainly the lead spiral and the unequal Concern training the shaft walls. These disadvantages are in accordance with the invention avoided that instead of the -radially arranged essentially over their the entire length of the shaft walls with the same thickness widening towards the outside with wedges preferably the same dimensions are used, the side walls directed perpendicular to the radiation-sensitive plate and radially to the axis of rotation of the diaphragm are in planes that go through the focal point of the X-ray tube. Through this is achieved with a substantial simplification of the manufacture of the aperture that all Points of the photographic plate lying under the diaphragm practically evenly be exposed with the sole exception of those in a small circle around the center and which are essentially in the shadow of the diaphragm axis fall.
Diesen Nachteil kann. man aber dadurch nahezu ganz beheben, daß man die Scheibe am Rande in einem Kugel- oder Rollenlager in bekannter Weise laufen läßt.This disadvantage can. but can be remedied almost entirely by the fact that one run the disc at the edge in a ball or roller bearing in a known manner leaves.
DieHöhe derKeile kann um so niedriger gehalten werden, j e dichter sie beieinander stehen. Die Drehung der Scheibe kann durch Kurbelantrieb, Motor oder auch von Hand erfolgen, da die Geschwindigkeit in weiten Grenzen gleichgültig für den Erfolg ist.The height of the wedges can be kept lower, the closer they are they stand together. The rotation of the disc can go through Crank drive, Motor or by hand, since the speed is indifferent within wide limits for success is.
Die Abb. i und 2 zeigen ein Ausführungsbeispiel der Erfindung, und zwar Abb. i in einem zwischen zwei benachbarte strahlenundurchlässige Keile geführten Querschnitt, Abb. z im horizontalen Schnitt nach der Linie C-D der Abb. i.Figs. I and 2 show an embodiment of the invention, and although Fig. i in a guided between two adjacent radiopaque wedges Cross-section, Fig. Z in the horizontal section along the line C-D in Fig. I.
Die von dem Fokus F ausgehenden Strahlen durchdringen zunächst den Körper k. Die Rotationsblende b" steht unter dem Körirer und ist in einem Kasten angeordnet, dessen Wände o und u für die Strahlen durchlässig sind. Unter den Kasten legt man die photographische Platte p. t ist die Tischplatte.The rays emanating from the focus F first penetrate the Body k. The rotating diaphragm b "stands under the body and is in a box arranged, whose walls o and u are permeable to the rays. Under the box if you put the photographic plate p. t is the table top.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEZ13333D DE388386C (en) | 1922-09-02 | 1922-09-02 | Rotary screen for shielding the image-obscuring secondary rays during X-ray exposures |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEZ13333D DE388386C (en) | 1922-09-02 | 1922-09-02 | Rotary screen for shielding the image-obscuring secondary rays during X-ray exposures |
Publications (1)
Publication Number | Publication Date |
---|---|
DE388386C true DE388386C (en) | 1924-01-17 |
Family
ID=7623215
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEZ13333D Expired DE388386C (en) | 1922-09-02 | 1922-09-02 | Rotary screen for shielding the image-obscuring secondary rays during X-ray exposures |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE388386C (en) |
-
1922
- 1922-09-02 DE DEZ13333D patent/DE388386C/en not_active Expired
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