Patent Number: 
Section: claims

1. An extra-oral dental x-ray imaging system, for performing a partial CT or partial 3D image of a region of interest of an object, the system comprising:a) an x-ray source for exposing an object to x-rays so that the object may be imaged during the exposure;b) an x-ray imaging device suitable for producing multiple radiated image frames during at least part of the exposure;c) a first manipulator unit for moving the imaging device and the x-ray source along a path between plural positions corresponding to plural radiated image frames during the exposure, the manipulator unit configured for enabling movement of both the x-ray source and the imaging device by selective rotation about at least one rotational axis located between a focal point of the x-ray source and the x-ray imaging device, wherein during the exposure the manipulator unit moves the imaging device and the x-ray source about the at least one rotational axis;d) a second manipulator unit configured for providing at least one of translation and rotation of the x-ray source; ande) a third manipulator unit configured for providing at least one of translating and rotating the imaging device,said second and third manipulators being separate from each other and separate from said first manipulator unit and configured for translation and rotation the imaging device and x-ray source independently of each other and independently of the first manipulator, and relative to the axis of rotation during at least part of the exposure so that during the exposure the rotational axis is virtually moved along a curve due to the at least one of translation and rotation of the x-ray source and of the imaging device respectively provided by the first and second manipulators. 2. An extra-oral dental x-ray imaging system according to claim 1, wherein,during the at least part of the exposure the rotational axis is virtually moved along the curve without physically moving the axis of rotation, byi) the first manipulator unit rotating the imaging device and the x-ray source along the path during the at least part of the exposure about the one rotational axis without the one rotational axis moving,ii) the second manipulator unit translating or rotating the x-ray source during the exposure,iii) third manipulator unit translating or rotating the at least part of the imaging device during the exposure, andthe curve defines a spiral. 3. An extra-oral dental x-ray imaging system according to claim 1, wherein through i) the first manipulator unit moving the imaging device and the x-ray source along a path between plural positions corresponding to plural radiated image frames during the exposure, the first manipulator unit moving both the x-ray source and the imaging device by both selective translation and selective rotation about the at least one rotational axis located between the focal point of the x-ray source and the x-ray imaging device, and ii) the third manipulator unit rotating the imaging device during at least part of the exposure with respect to the rotational axis, during the exposure the geometry of the imaging device and the x-ray source is changed with respect to the rotational axis. 4. An extra-oral dental x-ray imaging system according to claim 1, wherein through i) the first manipulator unit moving the imaging device and the x-ray source along a path between plural positions corresponding to plural radiated image frames during the exposure, the first manipulator unit moving both the x-ray source and the imaging device by both selective translation and selective rotation about the at least one rotational axis located between the focal point of the x-ray source and the x-ray imaging device, and ii) the second manipulator unit rotating the x-ray source during at least part of the exposure with respect to the rotational axis, during the exposure the geometry of the imaging device and the x-ray source is changed with respect to the rotational axis. 5. An extra-oral dental x-ray imaging system according to claim 1, wherein through i) the first manipulator unit moving the imaging device and the x-ray source along a path between plural positions corresponding to plural radiated image frames during the exposure, the first manipulator unit moving both the x-ray source and the imaging device by both selective translation and selective rotation about the at least one rotational axis located between the focal point of the x-ray source and the x-ray imaging device, and ii) the third manipulator unit translating the imaging device during at least part of the exposure with respect to the rotational axis, during the exposure the relative geometry of the imaging device and the x-ray source changes to further increase the field of view. 6. An extra-oral dental x-ray imaging system according to claim 1, wherein through i) the first manipulator unit moving the imaging device and the x-ray source along a path between plural positions corresponding to plural radiated image frames during the exposure, the first manipulator unit moving both the x-ray source and the imaging device by both selective translation and selective rotation about the at least one rotational axis located between the focal point of the x-ray source and the x-ray imaging device, and ii) the second manipulator unit translating the x-ray source during at least part of the exposure with respect to the rotational axis, during the exposure the relative geometry of the imaging device and the x-ray source changes to further increase the field of view. 7. An extra-oral dental x-ray imaging system according to claim 1, wherein through i) the first manipulator unit moving the imaging device and the x-ray source along a path between plural positions corresponding to plural radiated image frames during the exposure, the first manipulator unit moving both the x-ray source and the imaging device by both selective translation and selective rotation about the at least one rotational axis located between the focal point of the x-ray source and the x-ray imaging device, and ii) the third manipulator unit translating and rotating the imaging device during at least part of the exposure with respect to the rotational axis, during the exposure the rotational axis is virtually moved along a spiral. 8. An extra-oral dental x-ray imaging system according to claim 1, wherein through i) the first manipulator unit moving the imaging device and the x-ray source along a path between plural positions corresponding to plural radiated image frames during the exposure, the first manipulator unit moving both the x-ray source and the imaging device by both selective translation and selective rotation about the at least one rotational axis located between the focal point of the x-ray source and the x-ray imaging device, and ii) the second manipulator unit translating and rotating the x-ray source during at least part of the exposure with respect to the rotational axis, the rotational axis is virtually moved along the curve by defining a spiral. 9. An extra-oral dental x-ray imaging system according to claim 1, wherein through the third manipulator unit translating and rotating the imaging device during at least part of the exposure with respect to the rotational axis, during the exposure the rotational axis is virtually moved, without physically moving the axis of rotation, along the curve by defining a spiral. 10. An extra-oral dental x-ray imaging system according to claim 1, wherein through the second manipulator translating and rotating the x-ray source during at least part of the exposure with respect to the rotational axis, the rotational axis is virtually moved, without physically moving the axis of rotation, along a spiral. 11. An extra-oral dental x-ray imaging system according to claim 1, wherein through the second and third manipulator units translating and rotating respectively the x-ray source and imaging device during at least part of the exposure with respect to the rotational axis, the rotational axis is virtually moved without physically moving the axis of rotation. 12. An extra-oral dental x-ray imaging system, for performing a partial CT or partial 3D image of a region of interest of an object, the system comprising:a) an x-ray source for providing an x-ray beam for exposing an object to x-rays so that the object may be imaged during the exposure;b) an x-ray imaging device suitable for producing multiple radiated image frames during at least part of the exposure;c) a manipulator unit for moving the imaging device and the x-ray source along a path between plural positions corresponding to plural radiated image frames during the exposure, the manipulator unit configured for enabling movement of both the x-ray source and the imaging device by selective translation and selective rotation about a rotational axis located between a focal point of the x-ray source and the x-ray imaging device, wherein during the exposure the manipulator unit moves the imaging device and the x-ray source in at least one of translation and rotation about the at least one rotational axis, the manipulator unit comprising i) a first manipulator configured for selective translation of both the x-ray source and the imaging device, ii) a second manipulator configured for selective rotational movement of both the x-ray source and the imaging device; andd) an additional manipulator, separate from said first and second manipulators, configured for translating or rotating at least one of i) the imaging device during at least part of the exposure with respect to the rotational axis, and ii) a component causing effectively the x-ray source to be translated or rotated during at least part of the exposure with respect to the rotational axis so that during the exposure the rotational axis is virtually moved, without physically moving the axis of rotation, along a curve. 13. An extra-oral dental x-ray imaging system according to claim 12, wherein the component is the x-ray source and the curve is a spiral. 14. An extra-oral dental x-ray imaging system according to claim 13, wherein through i) the manipulator unit moving the imaging device and the x-ray source along a path between plural positions corresponding to plural radiated image frames during the exposure, the manipulator unit moving both the x-ray source and the imaging device by selective rotation about the at least one rotational axis located between the focal point of the x-ray source and the x-ray imaging device, and ii) the additional manipulator translating the x-ray source during at least part of the exposure with respect to the rotational axis, during the exposure the geometry of the imaging device and the x-ray source is changed with respect to the rotational axis and the curve is a spiral. 15. An extra-oral dental x-ray imaging system according to claim 13, wherein through i) the manipulator unit moving the imaging device and the x-ray source along a path between plural positions corresponding to plural radiated image frames during the exposure, the manipulator unit moving both the x-ray source and the imaging device by at least one of selective translation and selective rotation about the at least one rotational axis located between the focal point of the x-ray source and the x-ray imaging device, and ii) the additional manipulator rotating the x-ray source during at least part of the exposure with respect to the rotational axis, during the exposure the relative geometry of the imaging device and the x-ray source changes to further increase the field of view and the curve is a spiral. 16. An extra-oral dental x-ray imaging system according to claim 13, wherein through i) the manipulator unit moving the imaging device and the x-ray source along a path between plural positions corresponding to plural radiated image frames during the exposure, the manipulator unit moving both the x-ray source and the imaging device by at least one of selective translation and selective rotation about the at least one rotational axis located between the focal point of the x-ray source and the x-ray imaging device, and ii) the additional manipulator translating and rotating the x-ray source during at least part of the exposure with respect to the rotational axis, the rotational axis is virtually moved, without physically moving the axis of rotation, along a spiral. 17. An extra-oral dental x-ray imaging system according to claim 12, wherein through i) the manipulator unit moving the imaging device and the x-ray source along a path between plural positions corresponding to plural radiated image frames during the exposure, the manipulator unit moving both the x-ray source and the imaging device by at least one of selective translation and selective rotation about the at least one rotational axis located between the focal point of the x-ray source and the x-ray imaging device, and ii) the additional manipulator rotating the imaging device during at least part of the exposure with respect to the rotational axis, during the exposure during the exposure the geometry of the imaging device and the x-ray source is changed with respect to the rotational axis and the curve is a spiral. 18. An extra-oral dental x-ray imaging system according to claim 12, wherein through i) the manipulator unit moving the imaging device and the x-ray source along a path between plural positions corresponding to plural radiated image frames during the exposure, the manipulator unit moving both the x-ray source and the imaging device by at least one of selective translation and selective rotation about the at least one rotational axis located between the focal point of the x-ray source and the x-ray imaging device, and ii) the additional manipulator translating the imaging device during at least part of the exposure with respect to the rotational axis, during the exposure the rotational axis is moved, without physically moving the axis of rotation, along a spiral. 19. An extra-oral dental x-ray imaging system according to claim 13, wherein through i) the manipulator unit moving the imaging device and the x-ray source along a path between plural positions corresponding to plural radiated image frames during the exposure, and ii) the additional manipulator translating and rotating the the imaging device during at least part of the exposure with respect to the rotational axis, during the exposure the rotational axis is virtually moved, without physically moving the axis of rotation and the curve is a spiral. 20. An extra-oral dental x-ray imaging system, for performing a partial CT or partial 3D image of a region of interest of an object, the system comprising:a) an x-ray source for exposing an object to x-rays so that the object may be imaged during the exposure;b) an x-ray imaging device suitable for producing multiple radiated image frames during at least part of the exposure;c) a manipulator unit for moving the imaging device and the x-ray source along a path between plural positions corresponding to plural radiated image frames during the exposure, the manipulator unit configured for enabling movement of both the x-ray source and the imaging device by selective rotation about one rotational axis located between a focal point of the x-ray source and the x-ray imaging device, wherein during the exposure the manipulator unit moves the imaging device and the x-ray source about the one rotational axis with the one rotational axis remaining physical fixed; andd) an additional manipulator unit configured for providing translation of the x-ray source and the imaging device, the additional manipulator unit being separate from the manipulator unit, the additional manipulator unit configured to translate the x-ray source and the imaging device relative to the one rotational axis during at least part of the exposure so that during the exposure the rotational axis is virtually moved along a curve without physically moving the one axis of rotation. 21. An extra-oral dental x-ray imaging system according to claim 20, wherein,the additional manipulator unit comprises:i) a first additional manipulator for translating the imaging device along one direction, during the at least part of the exposure with respect to the one rotational axis of rotation, andii) a second additional manipulator for translating the x-ray source along a second direction that is different from the first direction, during the at least part of the exposure with with respect to the rotational axis of rotation, andthe curve defines a spiral.