DE3011966A1 - X-RAY DIAGNOSTIC GENERATOR WITH A CONTROL CIRCUIT FOR DOSING PERFORMANCE - Google Patents
X-RAY DIAGNOSTIC GENERATOR WITH A CONTROL CIRCUIT FOR DOSING PERFORMANCEInfo
- Publication number
- DE3011966A1 DE3011966A1 DE19803011966 DE3011966A DE3011966A1 DE 3011966 A1 DE3011966 A1 DE 3011966A1 DE 19803011966 DE19803011966 DE 19803011966 DE 3011966 A DE3011966 A DE 3011966A DE 3011966 A1 DE3011966 A1 DE 3011966A1
- Authority
- DE
- Germany
- Prior art keywords
- generator
- ray diagnostic
- dose rate
- ray
- ray tube
- 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.)
- Withdrawn
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
- H05G1/26—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
-
- 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
- H05G1/46—Combined control of different quantities, e.g. exposure time as well as voltage or current
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- X-Ray Techniques (AREA)
Description
SIEMENS AKTIENGESELLSCHAFT Unser ZeichenSIEMENS AKTIENGESELLSCHAFT Our mark
Berlin und München VPA 80 P 5O41 DEBerlin and Munich VPA 80 P 5O41 DE
Röntgendiagnostikgenerator mit einem Regelkreis für die Dosisleistung X-ray diagnostic generator with a control loop for the dose rate
Die Erfindung betrifft einen Röntgendiagnostikgenerator mit einem Regelkreis für die Dosisleistung, der als Stellglied mindestens einen elektronisch steuerbaren Widerstand im Hochspannungskreis der Röntgenröhre aufweist, dem ein Stellsignal zugeführt wird, das von einer Regeleinrichtung für die Dosisleistung mit einem Soll- und einem Istwerteingang geliefert wird.The invention relates to an X-ray diagnostic generator with a control circuit for the dose rate, which has at least one electronically controllable resistor in the high-voltage circuit of the X-ray tube as an actuator, to which an actuating signal is fed that is supplied by a control device for the dose rate with a setpoint and an actual value input.
Ein Röntgendiagnostikgenerator dieser Art ist beispielsweise in der DE-OS 22 04 453 beschrieben. Bei diesem Röntgendiagnostikgenerator liegen im Hochspannungskreis zwei Trioden, deren Gitterpotential so eingestellt wird, daß an ihnen eine Spannung abfällt, die die richtige Röntgenröhrenspannung zur Folge hat. Der bekannte Röntgendiagnostikgenerator erlaubt eine sehr schnelle Ausregelung von Regelabweichungen. Zusätzlieh zur Veränderung der Röntgenröhrenspannung im Sinne eines Angleiches des Istwertes der Dosisleistung an den Sollwert ist bei dem bekannten Röntgendiagnostikgenerator auch eine Beeinflussung des Röntgenröhrenstromes möglich.An X-ray diagnostic generator of this type is described in DE-OS 22 04 453, for example. With this one X-ray diagnostic generators are in the high-voltage circuit two triodes, the grid potential of which is set so that a voltage drops across them, the the correct X-ray tube voltage. The known X-ray diagnostic generator allows a great deal fast adjustment of system deviations. Additionally to change the X-ray tube voltage in the sense of an adjustment of the actual value of the dose rate In the known X-ray diagnostic generator, the setpoint value is also influenced by the X-ray tube current possible.
Der Erfindung liegt die Aufgabe zugrunde, einen Röntgendiagnostikgenerator der eingangs genannten Art so auszubilden, daß der Regelbereich gegenüber dem Stand der Technik vergrößert ist.The invention is based on the object of an X-ray diagnostic generator of the type mentioned at the beginning so that the control range compared to the state the technology is enlarged.
Tp 5 Ler / 12.3.1980Tp 5 Ler / 12.3.1980
130040/0823130040/0823
- «2. - VPA 80 P 5041 DE- «2. - VPA 80 P 5041 DE
Diese Aufgabe ist erfindungsgemäß dadurch gelöst, daß die Regeleinrichtung einen Funktionsgenerator zum Steuern der Welligkeit der Röntgenröhrenspannung aufweist. Bei dem'erfindungsgemäßen Röntgendiagnostikgenerator ist es möglich, zur Regelung der Dosisleistung von einem maximalen Röntgenröhrenspannungswert bis zu einem unteren Grenzwert von z.B. 50 kV die Röntgenröhrenspannung zu verändern. Sollte dieser Regelbereich nicht ausreichen, so ist es möglich, zusätzlich die Kurvenform der Röntgenröhrenspannung über den Funktionsgenerator zu beeinflussen. Dadurch ist der Regelbereich gegenüber dem Stand der Technik wesentlich erweitert. This object is achieved according to the invention in that the control device has a function generator for controlling the ripple of the X-ray tube voltage. With the X-ray diagnostic generator according to the invention, it is possible to change the X-ray tube voltage to regulate the dose rate from a maximum X-ray tube voltage value to a lower limit value of, for example, 50 kV. If this control range is not sufficient, it is also possible to influence the curve shape of the X-ray tube voltage via the function generator. As a result, the control range is significantly expanded compared to the prior art.
Die Erfindung ist nachfolgend anhand eines in der Zeichnung dargestellten AusfUhrungsbeispieles näher erläutert. The invention is explained in more detail below with reference to an exemplary embodiment shown in the drawing.
In der Zeichnung ist der Hochspannungskreis eines Röntgendiagnostikgenerators nach der Erfindung dargestellt, in dem in Reihe zu einer Röntgenröhre 1 zwei Trioden 2 und 3 geschaltet sind. Zwischen der Anode der Triode 2 und der Kathode der Triode 3 liegt die von einem Hochspannungsgleichrichter gelieferte Hochspannung, die die maximale Röntgenröhrenspannung darstellt. Die Steuergitter der Trioden 2 und 3 werden von einem Verstärker 4 angesteuert, der Bestandteil einer Regeleinrichtung 5 für die Dosisleistung ist. Der Verstärkungsfaktor des Verstärkers 4 und damit das Gitterpotential der Trioden 2 und 3 werden von einem Vergleicher 6 für ein Istwertsignal am Eingang und ein Sollwertsignal am Eingang 8 für die Dosisleistung angesteuert. Das Istwertsignal wird von einem Strahlendetektor 9 geliefert.In the drawing, the high-voltage circuit of an X-ray diagnostic generator according to the invention is shown, in which two triodes 2 and 3 are connected in series to form an X-ray tube 1. Between the anode the triode 2 and the cathode of the triode 3 have the high voltage supplied by a high voltage rectifier, which represents the maximum X-ray tube voltage. The control grids of triodes 2 and 3 become controlled by an amplifier 4, which is part of a control device 5 for the dose rate. The gain of the amplifier 4 and thus the grid potential of the triodes 2 and 3 are from a comparator 6 for an actual value signal at the input and a setpoint signal at input 8 for the dose rate is controlled. The actual value signal is from a Radiation detector 9 delivered.
130040/0823130040/0823
-V--V-
- y - VPA 80 P 5041 DE- y - VPA 80 P 5041 DE
Zwischen dem Verstärker 4 und dem Vergleicher 6 liegt ein Funktionsgenerator 10, der von einer Abtastschaltung 11 angesteuert wird.Between the amplifier 4 and the comparator 6 there is a function generator 10, which is generated by a sampling circuit 11 is controlled.
Wenn die Differenz zwischen dem Istwert und dem Sollwert der Dosisleistung innerhalb vorbestimmter Grenzen liegt, wird ein Angleich des Istwertes der Dosisleistung an den Sollwert durch Veränderung des ohmschen Widerstandes der Trioden 2 und 3 über den Verstärker 4 vorgenommen. Die Röntgenröhrenspannung bewegt sich dabei innerhalb eines vorbestimmten Bereiches zwischen z.B. 50 und 150 kV. Wenn die Regelabweichung in dem Sinne einen vorbestimmten Wert überschreitet, daß eine Spannungseinstellung erforderlich wäre, die unter dem unteren Grenzwert von z.B. 50 kV liegt, wird der Funktionsgenerator 10 über die Abtastschaltung 11 aktiviert. Der Funktionsgenerator 10 verändert die Kurvenform der Röntgenröhrenspannung über Pulse, die er dem Verstärker 4 zuführt, so daß die Trioden 2 und 3 entsprechend periodisch zwischen einem hohen und einem niedrigen Widerstandswert umgeschaltet werden. Dadurch ist eine weitere Beeinflussung des Istwertes der Dosisleistung im Sinne eines Angleiches an den Sollwert möglich. Der Funktionsgenerator 10 kann dabei zur Erzeugung der Pulsation der Röntgenröhrenspannung mit einer Thyristorschaltung ausgerüstet sein.When the difference between the actual value and the target value of the dose rate is within predetermined limits is, an adjustment of the actual value of the dose rate to the target value by changing the ohmic Resistance of the triodes 2 and 3 made via the amplifier 4. The X-ray tube voltage moves within a predetermined range between e.g. 50 and 150 kV. When the system deviation exceeds a predetermined value in the sense that a voltage adjustment would be required, which is below the lower limit of, for example, 50 kV, the function generator 10 is activated via the sampling circuit 11 activated. The function generator 10 changes the waveform of the X-ray tube voltage via pulses, which he feeds to the amplifier 4, so that the triodes 2 and 3 correspondingly periodically between a high and a low resistance value. This has a further influence on the actual value the dose rate in the sense of an adjustment to the target value is possible. The function generator 10 can equipped with a thyristor circuit to generate the pulsation of the X-ray tube voltage be.
1 Figur1 figure
3 Patentansprüche3 claims
130040/0823130040/0823
Claims (3)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19803011966 DE3011966A1 (en) | 1980-03-27 | 1980-03-27 | X-RAY DIAGNOSTIC GENERATOR WITH A CONTROL CIRCUIT FOR DOSING PERFORMANCE |
| FR8101353A FR2479635A1 (en) | 1980-03-27 | 1981-01-26 | Diagnostic X=ray machine radiation level control circuit - uses function generator connected to equaliser to maintain voltage above required level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19803011966 DE3011966A1 (en) | 1980-03-27 | 1980-03-27 | X-RAY DIAGNOSTIC GENERATOR WITH A CONTROL CIRCUIT FOR DOSING PERFORMANCE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE3011966A1 true DE3011966A1 (en) | 1981-10-01 |
Family
ID=6098576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19803011966 Withdrawn DE3011966A1 (en) | 1980-03-27 | 1980-03-27 | X-RAY DIAGNOSTIC GENERATOR WITH A CONTROL CIRCUIT FOR DOSING PERFORMANCE |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE3011966A1 (en) |
| FR (1) | FR2479635A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3424054A1 (en) * | 1984-06-29 | 1986-01-09 | Siemens AG, 1000 Berlin und 8000 München | X-ray diagnosis device having a control loop for an exposure value |
| DE102012219913A1 (en) * | 2012-10-31 | 2014-04-30 | Siemens Aktiengesellschaft | Method for controlling high voltage of X-ray generator for generating X-ray tube voltage, involves making noise compensation by intrusion of replication of trouble caused by rectification of net-alternating voltage supplied to generator |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2204453B2 (en) * | 1972-01-31 | 1977-09-01 | Siemens AG, 1000 Berlin und 8000 München | X-RAY DIAGNOSTIC APPARATUS WITH AN IMAGE AMPLIFIER TELEVISION CHAIN AND A CONTROL CIRCUIT ADJUSTING THE DOSE PERFORMANCE ACCORDING TO THE PATIENT |
| DE2303888A1 (en) * | 1973-01-26 | 1974-08-01 | Siemens Ag | ROYAL DIAGNOSTIC SYSTEM WITH TWO ROUND TUBES |
| DE2321448A1 (en) * | 1973-04-27 | 1974-11-14 | Siemens Ag | X-RAY DIAGNOSTIC APPARATUS FOR THE PRODUCTION OF X-RAY PHOTOS WITH AN EXPOSURE AUTOMATIC AND AUTOMATIC ADJUSTMENT OF THE RECORDING VOLTAGE |
| DE2653252A1 (en) * | 1976-11-24 | 1978-06-01 | Philips Patentverwaltung | X-RAY DIAGNOSTIC GENERATOR WITH A DOSAGE MEASURING DEVICE |
-
1980
- 1980-03-27 DE DE19803011966 patent/DE3011966A1/en not_active Withdrawn
-
1981
- 1981-01-26 FR FR8101353A patent/FR2479635A1/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3424054A1 (en) * | 1984-06-29 | 1986-01-09 | Siemens AG, 1000 Berlin und 8000 München | X-ray diagnosis device having a control loop for an exposure value |
| DE102012219913A1 (en) * | 2012-10-31 | 2014-04-30 | Siemens Aktiengesellschaft | Method for controlling high voltage of X-ray generator for generating X-ray tube voltage, involves making noise compensation by intrusion of replication of trouble caused by rectification of net-alternating voltage supplied to generator |
| DE102012219913B4 (en) * | 2012-10-31 | 2015-12-10 | Siemens Aktiengesellschaft | Method for controlling the high voltage of an X-ray tube and associated X-ray generator for generating an X-ray tube voltage |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2479635A1 (en) | 1981-10-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8139 | Disposal/non-payment of the annual fee |