CH157163A - Device to ensure the correctness of the X-ray tube current measurement in X-ray systems with Villard circuitry. - Google Patents
Device to ensure the correctness of the X-ray tube current measurement in X-ray systems with Villard circuitry.Info
- Publication number
- CH157163A CH157163A CH157163DA CH157163A CH 157163 A CH157163 A CH 157163A CH 157163D A CH157163D A CH 157163DA CH 157163 A CH157163 A CH 157163A
- Authority
- CH
- Switzerland
- Prior art keywords
- ray tube
- ray
- correctness
- villard
- current
- Prior art date
Links
Landscapes
- X-Ray Techniques (AREA)
Description
Einrichtung zur Sicherung der Richtigkeit der Röntgenröhrenstrommessung bei Röntgenanlagen mit TiRard-Schaltungsanordnung. Bei Einrichtungen zur Röntgenstrahlen- erzeugung mit Kondensatoren und Ventilen in Villard'scher Schaltungsanordnung, die ent sprechend Abb. <B>1</B> aus einem Hochspannungs- trausformator <B>1,</B> den Kondensatoren 2,<B>8,</B> der Ventilröhre 4 und der Röntgenröhre <B>5</B> be stehen, soll der die Kondensatoren ladende Strom ausschliesslich durch die Ventilröhre,
der sie entladende Strom ausschliesslich durch die Röntgenröhre fliessen. Ein im Stromkreis der Röntgenröhre liegendes Strommessgerät <B>6</B> zeigt in diesem Fall den Gebrauchsstrom richtig an. (Unter Gebrauchsstrom ist hierbei der Strom verstanden, der in der Röntgen röhre in dem dazu bestimmten Brennfleck Röntgenstrahlen erzeugt). Wenn die Röntgen röhre jedoch in der Richtung Kathode-Anode Strom durchlässt, was nicht selten, auch ohne dass es bemerkt wird, vorkommt, erlauben die Angaben des Messgerätes keine sicheren Rückschlüsse auf den Gebrauchsstrom. Das führt zu Fehlbelichtungen oder Überdosie rungen.
Die Richtigkeit der Strommessung lässt sich erfindungsgemäss dadurch sichern, dass, entsprechend dem Beispiel in Abb. 2, das zwischen Röntgenröhre und Ventilröhre lie gende Messinstrument in Reihe mit einem Ventil<B>(7)</B> liegt, welches den Strom in Rich tung des Nutzstromes durchlässt, während ein zweites Ventil<B>(8)</B> parallel zu dieser Mess- anordnung derart liegt, dass es für den die Röntgenröhre in verkehrter Richtung durch fliessenden Strom durchlässig ist.
Als Ventile<B>7, 8</B> werden zweckmässig Kupferoxydulgleichrichter verwendet. Diese können vorteilhaft in das Strommessgerät eingebaut sein.
Device to ensure the correctness of the X-ray tube current measurement in X-ray systems with TiRard circuitry. In the case of devices for X-ray generation with capacitors and valves in Villard's circuit arrangement, the corresponding Fig. 1 </B> from a high-voltage transformer <B> 1 </B> the capacitors 2, <B> 8, </B> of the valve tube 4 and the X-ray tube <B> 5 </B> exist, the current charging the capacitors should exclusively flow through the valve tube,
the current discharging them flow exclusively through the X-ray tube. In this case, an ammeter <B> 6 </B> located in the circuit of the X-ray tube correctly displays the current used. (The current used here is understood to mean the current that generates X-rays in the X-ray tube in the designated focal spot). However, if the X-ray tube allows current to pass in the direction of the cathode-anode, which often happens without being noticed, the information provided by the measuring device does not allow any reliable conclusions to be drawn about the current in use. This leads to incorrect exposures or overdosing.
According to the invention, the correctness of the current measurement can be ensured in that, according to the example in Fig. 2, the measuring instrument located between the X-ray tube and valve tube is in series with a valve <B> (7) </B>, which controls the current in Rich The flow of the useful flow allows through, while a second valve <B> (8) </B> is parallel to this measuring arrangement in such a way that it is permeable to the X-ray tube in the reverse direction through flowing current.
Copper oxide rectifiers are expediently used as valves 7, 8. These can advantageously be built into the ammeter.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE157163X | 1930-07-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH157163A true CH157163A (en) | 1932-09-15 |
Family
ID=5678400
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH157163D CH157163A (en) | 1930-07-07 | 1931-07-04 | Device to ensure the correctness of the X-ray tube current measurement in X-ray systems with Villard circuitry. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH157163A (en) |
-
1931
- 1931-07-04 CH CH157163D patent/CH157163A/en unknown
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