X-ray imaging system with cabling precharging module

Patent metadata

Field	Value
Publication number	US-9795022-B2
Application number	US-201414499885-A
Country	US
Kind code	B2
Filing date	Sep 29, 2014
Priority date	Jan 25, 2011
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

An X-ray imaging system can include an X-ray tube, an X-ray generator, a precharging module and a triaxial cable. The X-ray tube can be configured to generate an X-ray emission and include an anode, a cathode and a filament. The X-ray generator can be coupled with the X-ray tube and include a high voltage module and a low voltage module. The high voltage module can be being configured to supply a dosing voltage across the X-ray tube and the low voltage module can be configured to supply a dosing current to the filament. The precharging module can be configured to supply a precharge voltage. The triaxial cable can electrically connect the X-ray generator to the X-ray tube. The outer shield conductor of the triaxial cable can carry a ground voltage, the inner shield conductor can carry the precharge voltage and the center conductor can carry the dosing voltage.

First claim

What is claimed is:

1. A generator comprising:
a dosing module configured to (i) generate a dosing voltage, and (ii) supply the dosing voltage, via a first conductive element, to an x-ray tube to cause the x-ray tube to emit x-rays, wherein a capacitance exists between the first conductive element and a second conductive element; and
a precharge module configured to (i) generate a precharge voltage, and (ii), supply the precharge voltage to a third conductive element to reduce the capacitance between the first conductive element and the second conductive element,
wherein (i) the precharge voltage is equal to the dosing voltage, or (ii) the precharge module is configured to supply the precharge voltage to the third conductive element prior to the dosing module supplying the dosing voltage to the first conductive element.

2. The generator of claim 1 , wherein the precharge voltage is equal to the dosing voltage.

3. The generator of claim 1 , wherein the precharge module is configured to supply the precharge voltage to the third conductive element prior to the dosing module supplying the dosing voltage to the first conductive element.

4. The generator of claim 1 , wherein the first conductive element, the second conductive element, and the third conductive element extend within a single cable between the generator and the x-ray tube.

5. The generator of claim 1 , further comprising a control module configured to determine a delay between (i) when the dosing module is to supply the dosing voltage to the first conductive element, and (ii) when the precharge module is to supply the precharge voltage to the third conductive element,
wherein the dosing module is configured to supply the dosing voltage to the first conductive element based on the delay.

6. The generator of claim 5 , wherein the control module is configured to:
determine an amount of current supplied by the precharge module to the third conductive element; and
determine the delay based on the amount of current.

7. The generator of claim 1 , wherein the precharge module is configured to supply the precharge voltage to the third conductive element for a longer period of time than the dosing module supplies the dosing voltage to the first conductive element.

8. The generator of claim 1 , wherein the precharge module is configured to supply the precharge voltage to the third conductive element while the dosing module supplies the dosing voltage to the first conductive element.

9. The generator of claim 1 , further comprising a supply module configured to supply a dosing current via a fourth conductive element to the x-ray tube to cause the x-ray tube to emit the x-rays.

10. The generator of claim 9 , further comprising a control module configured to generate a first control output and a second control output, wherein:
the dosing module is configured to generate the dosing voltage based on the first control output;
the supply module is configured to supply the dosing current based on the second control output; and
the control module is configured to, via the first control output and the second control output, vary intensity and duration of the x-rays.

11. The generator of claim 1 , wherein:
the dosing module is configured to generate an indicator signal; and
the precharge module is configured to generate the precharge voltage based on the indicator signal.

12. The generator of claim 11 , wherein the indicator signal indicates a magnitude of the dosing voltage, a duration of the dosing voltage, or timing of the dosing voltage.

13. A system comprising:
the generator of claim 1 ; and
a first cable comprising the first conductive element, the second conductive element, and the third conductive element.

14. The system of claim 13 , wherein:
the first cable is connected to an anode of the x-ray tube; and
the third conductive element is not connected to the anode.

15. The system of claim 13 , wherein:
the first cable is connected to a cathode of the x-ray tube; and
the third conductive element is not connected to the cathode.

16. The system of claim 13 , wherein:
the first conductive element is a center conductor of the first cable;
the third conductive element is a first shield of the first cable and surrounds the first conductive element; and
the second conductive element is a second shield of the first cable and surrounds the third conductive element.

17. The system of claim 13 , further comprising:
a second cable; and
a supply module configured to supply a dosing current to the x-ray tube via the second cable.

18. The system of claim 13 , further comprising a second cable, wherein:
the dosing module is configured to supply the dosing voltage across the x-ray tube via the first cable and the second cable; and
the precharge module is configured to supply the precharge voltage via the second cable to the x-ray tube.

19. The system of claim 18 , further comprising:
a third cable; and
a supply module configured to supply a dosing current to the x-ray tube via the third cable.

20. A method comprising:
generating a dosing voltage;
supplying the dosing voltage, via a first conductive element, to an x-ray tube to cause the x-ray tube to emit x-rays, wherein a capacitance exists between the first conductive element and a second conductive element;
generating a precharge voltage; and
supplying the precharge voltage to a third conductive element to reduce the capacitance between the first conductive element and the second conductive element,
wherein (i) the precharge voltage is equal to the dosing voltage, or (ii) the precharge voltage is supplied to the third conductive element prior to the dosing voltage being supplied to the first conductive element.

21. The method of claim 20 , wherein the precharge voltage is equal to the dosing voltage.

22. The method of claim 20 , comprising supplying the precharge voltage to the third conductive element prior to supplying the dosing voltage to the first conductive element.

23. The method of claim 20 , wherein:
the first conductive element, the second conductive element, and the third conductive element extend within a single cable between a generator and the x-ray tube; and
the dosing voltage and the precharge voltage are supplied by the generator.

24. The method of claim 20 , further comprising:
determining a delay between (i) when the dosing voltage is to be supplied to the first conductive element, and (ii) when the precharge voltage is to be supplied to the third conductive element; and
supplying the dosing voltage to the first conductive element based on the delay.

25. The method of claim 24 , further comprising:
determining an amount of current supplied by a precharge module to the third conductive element, wherein the precharge voltage is supplied by the precharge module; and
determining the delay based on the amount of current.

26. The method of claim 20 , further comprising supplying the precharge voltage to the third conductive element for a longer period of time than supplying the dosing voltage to the first conductive element.

27. The method of claim 20 , further comprising supplying the precharge voltage to the third conductive element while supplying the dosing voltage to the first conductive element.

28. The method of claim 20 , further comprising supplying a dosing current via a fourth conductive

Assignees

• Medtronic Navigation Inc

Inventors

• Duhamel Eric V

Classifications

• H05G1/32 Primary

  Supply voltage of the X-ray apparatus or tube · CPC title

• H05G1/46

  Combined control of different quantities, e.g. exposure time as well as voltage or current · CPC title

• H05G1/56

  Switching-on; Switching-off · CPC title

• H05G1/10 Primary

  Power supply arrangements for feeding the X-ray tube {(supply circuits with converters in general H02M; supply circuits for emitters and amplifiers H04B1/16 - H04B1/1623)} · CPC title