EP0455001A2 - Arrangement de circuit pour des générateurs de rayons X, en particulier en vue d'applications diagnostiques - Google Patents

Arrangement de circuit pour des générateurs de rayons X, en particulier en vue d'applications diagnostiques Download PDF

Info

Publication number: EP0455001A2
Authority: EP; European Patent Office
Prior art keywords: voltage; tube; ray; personal computer; circuit arrangement
Prior art date: 1990-04-28
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.): Granted

Application number

EP91105238A

Other languages

German (de)

English (en)

Other versions

EP0455001B1 (fr

EP0455001A3 (en

Inventor

Klaus-Peter Bork

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Individual

Original Assignee

Individual

Priority date (The priority date 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 date listed.)

1990-04-28

Filing date

1991-04-03

Publication date

1991-11-06

Family has litigation

First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6405339&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0455001(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.

1991-04-03 Application filed by Individual filed Critical Individual

1991-11-06 Publication of EP0455001A2 publication Critical patent/EP0455001A2/fr

1992-03-11 Publication of EP0455001A3 publication Critical patent/EP0455001A3/de

1995-11-02 Application granted granted Critical

1995-11-02 Publication of EP0455001B1 publication Critical patent/EP0455001B1/fr

2011-04-03 Anticipated expiration legal-status Critical

Status Revoked legal-status Critical Current

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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
- H05G1/54—Protecting or lifetime prediction
- 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
- 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

Definitions

the invention relates to a circuit arrangement for X-ray generators used in particular for diagnostic purposes with a high-voltage rectifier which can be adapted to the requirements in its preselectable tube voltage, with a variable transformer and an X-ray tube connected to it, the heating power of which is provided by a heating voltage generator can be preset, the preselection of the tube voltage and the presetting of the heating power of the tube using a control according to the desired or necessary X-ray dose can be carried out.
the voltage of the X-ray tube (tube voltage) is preselected in order to ensure that the radiation is sufficiently soft or sufficiently hard for the intended use;
the heating current of the hot cathode of the X-ray tube is preselected in order to obtain a desired cathode current and thus a certain radiation yield, which also depends on the condition of the anode;
the duration of the radiation is preselected in order to be able to apply the desired radiation dose required for diagnosis or therapy at a dose rate given by the radiation hardness and radiation yield.
these values are set on the control panel, this being done by preselecting the high voltage on the variable transformer of the high-voltage rectifier and by setting the heating current. While the heating current already flows before the high voltage is switched on (preheated cathode) and so the measurement of the actually flowing heating current with corresponding converters does not cause any problems, the high voltage is only applied during the application time, it can therefore only be preset "cold", a procedure that is different from plant to plant due to the load dependency of the high voltage with flowing cathode current depending on the manageable internal resistances of the high-voltage rectifiers and the unmanageable source resistances of the network and brings considerable difficulties especially for trained personnel. In addition, especially during longer application times, a drop in due to a sudden switching on of a consumer or a sudden recovery of the mains voltage by switching off a consumer can result in an unpredictable change in the high voltage, which seriously changes the dose rate in an unpredictable manner.
the invention comes in, which is based on the object of further developing the circuit arrangement for controlling X-ray generators in such a way that even simply instructed personnel do so the presetting can be carried out in accordance with the desired radiation dose rate, radiation hardness and duration of exposure, the setting should be able to be carried out in a simple manner with logos and symbols.
this application requires a special interface that takes over the connection between the control and the personal computer PC.
This interface is constructed in such a way that, on the one hand, it transfers the analog (or already digitally converted on the encoder) feedback of the states of the actuators and the electrical and / or radiation measurements to the personal computer, which takes into account the technical data permanently stored in its application memory Values for the X-ray tube, the high-voltage generator and for the electrical supply network to which the high-voltage generator is connected, the current values for the X-ray tube and the present application determine the heating power to be provided and the required high voltage (excessive due to the network load).
the input informs the personal computer which application is present, the selection (and possibly the change) of the standard values proposed for this application for the values for the radiation dose rate for high voltage and heating power for the X-ray tube is then carried out in dialog.
the dialogue is carried out on a screen connected to the personal computer; the input is made via a keyboard connected to it.
the program required for this is provided by the on-screen menu, which offers the operator sufficient options with logos and entries offers. Since the application memory has stored the values for the standard setting for these use cases, the “setting” of the X-ray generator can be carried out in a simple manner and without any special expertise. In addition, corrections to these standard values are possible at any time (with the appropriate specialist knowledge).
safety-relevant operating values of the x-ray tube can be stored in the application memory.
the personal computer constantly compares the current operating values with the safety-relevant values in the memory that are to be regarded as limit values and keeps the current values in the range specified by these limit values. Security problems are inevitably avoided. Storing these values also allows these values to be adjusted if changes need to be made, for example due to a change in the safety concept. This also applies to the application-specific values stored in the application memory. While these are constantly updated by simply overwriting or adding, those require special treatment because of the security-related problems: The files must be secured against unauthorized overwriting; It is advantageous to use EPROMs, which require special treatment for deletion and rewriting (which is particularly important with regard to future changes to the security regulations).
the radiation yield of the X-ray tube depends on the condition of its anode and this changes with increasing age, it is necessary to monitor the radiation yield continuously or from time to time. This is done with a measuring device switched into the beam path, which triggers the load switch when the desired dose value is reached and thus switches off the high voltage.
This switch-off pulse is also used as an acknowledgment pulse for the personal computer PC and is fed to it via the interface. This tells the personal computer that the application is complete. This message causes a switching state that, for example, rules out a new application without confirmation. This is necessary to avoid double exposures when taking pictures; the need for such a blocking circuit also results from safety requirements.
the personal computer has further interfaces, one of which is used as a printer interface, to which a printer is connected as a further output unit.
the personal computer is able to output a protocol for the application of the tube voltage and tube current as well as the dose rate and the duration of the application.
these printouts can be used for documentation purposes e.g. in which patient records are collected.
electronic storage can also be carried out and a printout can only be made if necessary.
a connection to a higher-level computer is also possible with this or another interface. This higher-level computer can transmit the application data for the selected application, it can contain the security-relevant data and, finally, it can also take over the task of the memory for the data to be documented.
the personal computer PC - referred to here as the computer PC, has at least three interfaces, one of which is occupied by an input unit, the keyboard, and another by the output unit, the screen.
the interface with which the connection to the individual components of the X-ray generator is established is connected to the third interface.
the third interface which connects the interface, is set up as an IN / OUT port, via which position feedback and measured value signals, as well as acknowledgment signals to the computer, and control commands to the connected components run.
the desired application is selected via the input unit "keyboard" with the help of a corresponding menu provided by the program, and if the computer has also calculated the necessary high voltage and the heating power required for the necessary tube current based on this program, the corresponding control commands are issued by the Part "tube voltage” of the interface to the "control transformer” and part “tube current” of the interface to the "tap changer for heating", the actuators of which then execute the control commands.
the high voltage selected by the PC is then applied to the "load switch", with a value that is excessive under the expected reduction under load.
the heating is started up with an undervoltage as preheating, the switch "preheating / heating” is still in the position (not shown) "preheating with unstabilized voltage”.
the dose rate calculated by PC also affects the anode load, it should also be monitored.
the rotating anode is activated via the "dose automat" part of the interface, the beam bundling is set in the desired or necessary manner via “focus” and finally the feedback of the measuring chamber is recorded via the "dose control" locks the PC for further applications without a new confirmation.
Such feedback also takes place after the rotating anode has started, without this feedback the switching on of the load switch and thus the application of the high voltage to the X-ray tube is excluded.
the dose machine connected to the interface itself is generally not part of the X-ray generator, but is to be seen as an autonomously working part of the X-ray system.
the "load switch” part of the interface activates the high-voltage load switch, coupled with the changeover from "preheating with unstabilized voltage” to “heating with stabilized voltage”.
the use of a stabilized voltage ensures the desired heating power and thus the temperature of the heated cathode required for a specific tube current. Switching in the heating circuit allows adaptation to the different requirements, for example for exposure or fluoroscopy.
the interface also has measured value inputs, some of which go to the interface via the A / D converter of the "measured value converter” and partly directly via the “preparation for recording”.
the incoming measured values serve on the one hand to monitor the progress of the entire application, but on the other hand the measured values provide feedback e.g. about changes in the source resistance of the high-voltage rectifier (including the electrical connection network) and thus about the overvoltage to be set without load or the emissivity of the cathode as a function of the temperature of the cathode and thus the cathode heating power supplied.
the control takes place via the personal computer PC, which is loaded with a program, the structure of which can be seen in the flow diagram attached as an x-ray to FIG.
a system test is carried out under "INIT” and set all variable values to the starting position.
the system is then ready to accept the values determined for the given circumstances under "Input”. These values are checked for their conclusiveness under "Verify” and in the following YES / NO decision under "Start” the further program sequence is triggered given the start command. If the specifications are inconclusive or if the start command is not given, the system jumps back to the input and thus also allows an input correction.
the automatic exposure starts under "Exposure", during which the high voltage at the tube, the tube current, the heating current and the exposure time are measured. Errors that occur, i.e. Deviations from the specifications are identified by the system and reported as 6 errors. If necessary, termination and return to "input". During the exposure this test is repeated continuously by querying the parameters in a loop. After the passage of time, i.e. At the end of the exposure time, the measured values are displayed, including the current-time product in mAs that is important for the dose, which can also be documented, if necessary, by transmission to a higher-level computer, the personal computer PC hosted. The system then jumps back to "Enter” and is ready to accept new parameters.

Landscapes

Health & Medical Sciences (AREA)
General Health & Medical Sciences (AREA)
Toxicology (AREA)
X-Ray Techniques (AREA)
Apparatus For Radiation Diagnosis (AREA)
Details Of Television Scanning (AREA)
Ultra Sonic Daignosis Equipment (AREA)

EP91105238A 1990-04-28 1991-04-03 Arrangement de circuit pour des générateurs de rayons X, en particulier en vue d'applications diagnostiques Revoked EP0455001B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE4013703		1990-04-28
DE4013703A DE4013703C2 (de)	1990-04-28	1990-04-28	Schaltungsanordnung für insbesondere für Diagnosezwecke eingesetzte Röntgengeneratoren

Publications (3)

Publication Number	Publication Date
EP0455001A2 true EP0455001A2 (fr)	1991-11-06
EP0455001A3 EP0455001A3 (en)	1992-03-11
EP0455001B1 EP0455001B1 (fr)	1995-11-02

Family

ID=6405339

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP91105238A Revoked EP0455001B1 (fr)	1990-04-28	1991-04-03	Arrangement de circuit pour des générateurs de rayons X, en particulier en vue d'applications diagnostiques

Country Status (4)

Country	Link
EP (1)	EP0455001B1 (fr)
AT (1)	ATE129843T1 (fr)
DE (2)	DE4013703C2 (fr)
DK (1)	DK0455001T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE19520360C2 (de) *	1995-06-07	2000-08-10	Bork Klaus Peter	Verfahren zur Durchführung von Konstanzprüfungen an für Diagnosezwecke eingesetzte Röntgengeneratoren
EP1322143A2 (fr)	2001-12-21	2003-06-25	Philips Intellectual Property & Standards GmbH	Procédé et dispostif d'exposition des radiographies

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE4341289A1 (de) *	1993-12-03	1995-06-08	Siemens Ag	Medizinische Anlage
DE4341290A1 (de) *	1993-12-03	1995-06-08	Siemens Ag	Medizinische Anlage zur Therapie und/oder Diagnose
DE19635595C2 (de) *	1996-09-02	2003-07-17	Siemens Ag	Diagnostikeinrichtung mit Mitteln zur digitalen Bildspeicherung
DE19707728A1 (de) *	1997-02-26	1998-08-27	Siemens Ag	Röntgendiagnostikeinrichtung mit Filtermitteln
DE19750105B4 (de) *	1997-11-12	2011-04-14	Siemens Ag	Medizinische Therapie- und/oder Behandlungsanlage sowie Verfahren zum Betrieb einer solchen
DE102004042875B4 (de) *	2003-10-07	2006-07-20	Klaus-Peter Bork	Verfahren und Vorrichtung zum Schreiben und Führen eines Patienten-Röntgenpasses

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4158138A (en) *	1977-10-25	1979-06-12	Cgr Medical Corporation	Microprocessor controlled X-ray generator
DE3025107A1 (de) *	1980-07-02	1982-01-14	Siemens AG, 1000 Berlin und 8000 München	Roentgendiagnostikeinrichtung fuer aufnahme und durchleuchtung
DD158307A1 (de) *	1981-04-23	1983-01-05	Guenther Orth	Verfahren zur herstellung von roentgenaufnahmen
US4541106A (en) *	1984-02-22	1985-09-10	General Electric Company	Dual energy rapid switching imaging system
WO1986003363A1 (fr) *	1984-11-21	1986-06-05	Medicor	Dispositif de reglage des parametres d'exposition d'un equipement radiologique
DE3600464A1 (de) *	1986-01-10	1987-07-16	Philips Patentverwaltung	Roentgengenerator mit dosisleistungsregelung
EP0346530A1 (fr) *	1988-06-16	1989-12-20	Nicola Elias Yanaki	Procédé et dispositif pour optimiser la qualité radiographique par contrôle de la tension, du courant, de la dimension du foyer et du temps d'exposition d'un tube à rayons X
US4811374A (en) *	1986-11-13	1989-03-07	Medicor Usa Ltd.	Apparatus for setting exposure parameters of an X-ray generator
US4819258A (en) *	1986-11-28	1989-04-04	Bennett X-Ray Corp.	Auto-setting of KV in an x-ray machine after selection of technic factors

1990
- 1990-04-28 DE DE4013703A patent/DE4013703C2/de not_active Expired - Fee Related
1991
- 1991-04-03 DE DE59106797T patent/DE59106797D1/de not_active Revoked
- 1991-04-03 AT AT91105238T patent/ATE129843T1/de not_active IP Right Cessation
- 1991-04-03 DK DK91105238.9T patent/DK0455001T3/da active
- 1991-04-03 EP EP91105238A patent/EP0455001B1/fr not_active Revoked

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE19520360C2 (de) *	1995-06-07	2000-08-10	Bork Klaus Peter	Verfahren zur Durchführung von Konstanzprüfungen an für Diagnosezwecke eingesetzte Röntgengeneratoren
EP1322143A2 (fr)	2001-12-21	2003-06-25	Philips Intellectual Property & Standards GmbH	Procédé et dispostif d'exposition des radiographies
EP1322143A3 (fr) *	2001-12-21	2009-05-06	Philips Intellectual Property & Standards GmbH	Procédé et dispostif d'exposition des radiographies

Also Published As

Publication number	Publication date
ATE129843T1 (de)	1995-11-15
DE4013703C2 (de)	1999-04-01
DE59106797D1 (de)	1995-12-07
EP0455001B1 (fr)	1995-11-02
EP0455001A3 (en)	1992-03-11
DE4013703A1 (de)	1991-10-31
DK0455001T3 (da)	1996-02-26

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