JPS5490987A - X-ray unit - Google Patents
X-ray unitInfo
- Publication number
- JPS5490987A JPS5490987A JP15993277A JP15993277A JPS5490987A JP S5490987 A JPS5490987 A JP S5490987A JP 15993277 A JP15993277 A JP 15993277A JP 15993277 A JP15993277 A JP 15993277A JP S5490987 A JPS5490987 A JP S5490987A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- current
- ray
- exposure
- life
- 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
- 239000003990 capacitor Substances 0.000 abstract 2
- 238000009499 grossing Methods 0.000 abstract 2
- 230000001052 transient effect Effects 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
Landscapes
- X-Ray Techniques (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Abstract
PURPOSE: To make longer the life of smoothing capacitor and to make stable the X-ray tube current, by increasing the internal resistance of the tetrode tube for switching at the start of X-ray exposure and by suppressing the transient current.
CONSTITUTION: In the computerized tomograph (CT), the output of the high voltage generator 31 rectifying the high voltage AC is switched with the tetrode tube 32 and is given to the X-ray tube 33, and pulsive exposure of X-rays is made. By controlling the filament current of the tube 32 or the bias voltage of the first grid, the internal resistance is increased at turning on of the tube 32 and that is decreased after that. The circuit 35 plays a role of such function. Accordingly, at the start of X-ray exposure, the occurrence of transient current is avoided and the life of the smoothing capacitor 36 can be made longer, and since no voltage variation is present, the X-ray tube current is made stable, thereby increasing the reliability of the CT unit.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15993277A JPS5490987A (en) | 1977-12-27 | 1977-12-27 | X-ray unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15993277A JPS5490987A (en) | 1977-12-27 | 1977-12-27 | X-ray unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5490987A true JPS5490987A (en) | 1979-07-19 |
Family
ID=15704291
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15993277A Pending JPS5490987A (en) | 1977-12-27 | 1977-12-27 | X-ray unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5490987A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05152096A (en) * | 1991-03-29 | 1993-06-18 | Shimadzu Corp | Control circuit for vacuum tube incorporating grid for stereo x-ray tube |
WO2004064458A2 (en) | 2003-01-09 | 2004-07-29 | Siemens Aktiengesellschaft | High-voltage supply for an x-ray device |
-
1977
- 1977-12-27 JP JP15993277A patent/JPS5490987A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05152096A (en) * | 1991-03-29 | 1993-06-18 | Shimadzu Corp | Control circuit for vacuum tube incorporating grid for stereo x-ray tube |
WO2004064458A2 (en) | 2003-01-09 | 2004-07-29 | Siemens Aktiengesellschaft | High-voltage supply for an x-ray device |
WO2004064458A3 (en) * | 2003-01-09 | 2004-09-16 | Siemens Ag | High-voltage supply for an x-ray device |
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