Patent Number: 
Section: claims

1. A radiographic device for use with an image receptor, the radiographic device comprising:a base assembly including:a frame defining a frame top opening; anda platform supported by the frame and extending over the frame top opening, the platform defining a lateral direction and a longitudinal direction substantially perpendicular to the lateral direction, the platform and frame defining a base receptacle disposed below the platform;an arm assembly having a first end pivotably coupled to the base assembly and a second end;a radiographic head coupled to the arm assembly second end; anda carriage assembly disposed in the base receptacle and including a tray sized to receive the image receptor, the tray being supported for movement in both the lateral and longitudinal directions. 2. The radiographic device of claim 1, in which the base assembly includes a pedestal coupled to the frame and defining a top wall for supporting the tray. 3. The radiographic device of claim 2, in which the carriage assembly includes a carrier coupled to the tray and slidably disposed on the pedestal to permit movement of the tray in the lateral direction. 4. The radiographic device of claim 3, in which the carriage assembly includes a slide assembly disposed between the carrier and the tray and oriented to permit movement of the tray in the longitudinal direction. 5. The radiographic device of claim 1, further comprising a base collimator assembly including:a collimator plate positioned between the platform and the carriage assembly, the collimator plate defining a collimator aperture through which radiographic energy is admitted into the base receptacle; anda first collimator blade slidable relative to the collimator plate and movable to an extended position in which at least a portion of the first collimator blade is aligned with a first portion of the aperture. 6. The radiographic device of claim 5, in which the base collimator further includes a second collimator blade slidable relative to the collimator plate and movable to an extended position in which at least a portion of the second collimator blade is aligned with a second portion of the aperture. 7. The radiographic device of claim 6, in which the collimator aperture defines opposed first and second aperture lateral edges adjacent to the first and second portions of the aperture. 8. The radiographic device of claim 6, in which the first collimator blade is movable to the extended position independent of the second collimator blade. 9. The radiographic device of claim 1, in which the carriage assembly is supported in a non-weight bearing relationship relative to the patient platform. 10. The radiographic device of claim 1, in which the carriage assembly is coupled to the frame independently of the platform. 11. The radiographic device of claim 1, in which the frame defines a side opening aligned with the carriage assembly, and in which the tray is movable through the frame side opening to a receptor loading position. 12. A radiographic device for use with an image receptor, the radiographic device comprising:a base assembly including:a frame defining a frame top opening; anda platform supported by the frame and extending over the frame top opening, the platform and frame defining a base receptacle disposed below the platform;an arm assembly having a first end pivotably coupled to the base assembly and a second end;a radiographic head coupled to the arm assembly second end;a tray disposed in the base receptacle and sized to receive the image receptor; anda base collimator assembly including:a collimator plate positioned between the platform and the tray, the collimator plate defining a collimator aperture through which radiographic energy is admitted into the base receptacle;a first collimator blade slidable relative to the collimator plate and movable to an extended position in which at least a portion of the first collimator blade is aligned with a first portion of the aperture; anda second collimator blade slidable relative to the collimator plate and movable to an extended position in which at least a portion of the second collimator blade is aligned with a second portion of the aperture. 13. The radiographic device of claim 12, in which the collimator aperture defines opposed first and second aperture lateral edges adjacent to the first and second portions of the aperture. 14. The radiographic device of claim 12, in which the first collimator blade is movable to the extended position independent of the second collimator blade. 15. The radiographic device of claim 12, in which the tray is supported in a non-weight bearing relationship relative to the patient platform. 16. A radiographic device for use with an image receptor, the radiographic device comprising:a base assembly including:a frame defining a frame top opening; anda platform supported by the frame and extending over the frame top opening, the platform defining a lateral direction and a longitudinal direction substantially perpendicular to the lateral direction, the platform and frame defining a base receptacle disposed below the platform;an arm assembly having a first end pivotably coupled to the base assembly and a second end;a radiographic head coupled to the arm assembly second end;a carriage assembly disposed in the base receptacle and including a tray sized to receive the image receptor, the tray being supported for movement in both the lateral and longitudinal directions; anda base collimator assembly including:a collimator plate positioned between the platform and the tray, the collimator plate defining a collimator aperture through which radiographic energy is admitted into the base receptacle;a first collimator blade slidable relative to the collimator plate and movable to an extended position in which at least a portion of the first collimator blade is aligned with a first portion of the aperture; anda second collimator blade slidable relative to the collimator plate and movable to an extended position in which at least a portion of the second collimator blade is aligned with a second portion of the aperture. 17. The radiographic device of claim 16, in which:the base assembly includes a pedestal coupled to the frame and defining a top wall for supporting the tray;the carriage assembly includes a carrier coupled to the tray and slidably disposed on the pedestal to permit movement of the tray in the lateral direction; andthe carriage assembly includes a slide assembly disposed between the carrier and the tray and oriented to permit movement of the tray in the longitudinal direction. 18. The radiographic device of claim 16, in which the collimator aperture defines opposed first and second aperture lateral edges adjacent to the first and second portions of the aperture. 19. The radiographic device of claim 16, in which the first collimator blade is movable to the extended position independent of the second collimator blade. 20. The radiographic device of claim 16, in which the tray is supported in a non-weight bearing relationship relative to the patient platform.