Patent Number: 
Section: claims

1. A mobile X-ray unit comprising:a base having a control unit configured to control an X-ray applicator and a power supply configured to supply power to the X-ray applicator;an articulated arm associated with the base and coupled to the X-ray applicator, the X-ray applicator having an X-ray tube including a target for generating an X-ray beam, a collimator for shaping the X-ray beam, and an exit surface through which the shaped X-ray beam is configured to exit the X-ray tube; andat least one light source configured to illuminate at least a portion of the X-ray beam emitted from the exit surface. 2. The mobile X-ray unit according to claim 1, wherein the at least one light source is an array of light sources arranged concentrically around the X-ray applicator. 3. The mobile X-ray unit according to claim 2, wherein the X-ray beam has a longitudinal axis, and wherein each light source is arranged to emit a beam of light towards the longitudinal axis at a pre-determined distance from the exit surface of the X-ray tube. 4. The mobile X-ray unit according to claim 1, wherein the light source is disposed inside the X-ray applicator, and wherein the light source is configured to emit a light beam that is intercepted by the collimator so as to generate an image of an X-ray field emitted from the exit surface of the X-ray tube. 5. The mobile X-ray unit according to claim 1, further including at least one optical fiber configured to deliver light from the light source for interception by the collimator. 6. The mobile X-ray unit according to claim 5, wherein the at least one light source is connected to a plurality of optical fibers disposed above the collimator in the X-ray applicator, the optical fibers being configured to illuminate an opening of the collimator. 7. The mobile X-ray unit according to claim 1, wherein the at least one light source is configured to emit a light beam so as to delineate a longitudinal axis of the X-ray beam. 8. The mobile X-ray unit according to claim 1, wherein the at least one light source is a laser. 9. The mobile X-ray unit according to claim 1, wherein the at least one light source is a light emitting diode (LED). 10. The mobile X-ray unit according to claim 1, wherein the at least one light source is configured to provide a contrast image of at least a portion of the X-ray beam. 11. The mobile X-ray unit according to claim 1, wherein the collimator is provided with identification devices configured to generate a signal representative of characteristics of the collimator and transmit the signal to the control unit. 12. The mobile X-ray unit according to claim 1, wherein the collimator is configured to be received in a receptacle having a resistive path, the collimator having a set of projections configured to cooperate with the resistive path of the receptacle for generation the signal. 13. The mobile X-ray unit according to claim 1, further including a set of collimators each having unique identification devices. 14. The mobile X-ray unit according to claim 1, further including a radiation detector for detecting the X-ray beam. 15. The mobile X-ray unit according to claim 14, wherein the radiation detector is configured to generate a control signal upon generation of the X-ray beam. 16. The mobile X-ray unit according to claim 1, further comprising a temperature sensor configured to measure a temperature of a surface of one of the X-ray tube and the X-ray applicator. 17. The mobile X-ray unit according to claim 1, further including an applicator cap for covering at least an exit surface of the X-ray applicator. 18. The mobile X-ray unit according to claim 17, wherein the applicator cap is disposable after a single use of the X-ray applicator. 19. The mobile X-ray unit according to claim 17, wherein a thickness of the applicator cap in a direction of the beam propagation is sufficient for substantially eliminating electron contamination from the X-ray beam. 20. The mobile X-ray unit according to claim 1, wherein the power supply is operable in the range of 60-75 kV for generating the X-ray beam. 21. The mobile X-ray unit according to claim 20, wherein the power supply is operable for delivering power of about 200 W in use. 22. The mobile X-ray unit according to claim 1, wherein the X-ray applicator is connected to the base by a flexible cable, and wherein the flexible cable is disposed in a displaceable panel. 23. The mobile X-ray unit according to claim 22, wherein the at least one light source is disposed in the displaceable panel. 24. The mobile X-ray unit according to claim 20, wherein the at least one light source is disposed in the base. 25. The mobile X-ray unit according to claim 22, wherein the displaceable panel includes a user interface for controlling the X-ray unit. 26. The mobile x-ray unit according to claim 1, wherein the at least one light source is configured to illuminate a two-dimensional portion of the surface irradiated by the X-ray beam. 27. A method for visually delineating an X-ray beam emitted from a mobile X-ray unit, the mobile X-ray unit including a base having a control unit configured to control an X-ray applicator and a power supply configured to supply power to the X-ray applicator, the mobile X-ray unit further including an articulated arm associated with the base and coupled to an X-ray applicator, the X-ray applicator having an X-ray tube including a target, a collimator, and an exit surface, the method comprising:generating an X-ray beam;shaping the X-ray beam; andilluminating at least a portion of the surface irradiated by the shaped X-ray beam emitted from the exit surface. 28. The method according to claim 27, further including a light source. 29. The method of claim 28, wherein the light source is disposed in the X-ray applicator. 30. The method according to claim 28, wherein the light source is disposed on the X-ray applicator. 31. The method according to claim 28, wherein the light source is configured to generate a light field providing indication of a two-dimensional area of the X-ray beam. 32. The method according to claim 28, wherein the light source is configured to delineate a longitudinal axis of the X-ray beam.