Patent Number: 
Section: claims

1. An imaging assembly comprising:a frame having an aperture with an aperture length and an aperture width;at least one shield having a shield length and a shield width;the at least one shield being positioned within the aperture;wherein the shield width is greater than or equal to the aperture width; andwherein the shield length is 0.05% to 5% less than one half of the aperture length. 2. An imaging assembly as in claim 1, wherein the at least one shield is formed of an x-ray absorbent material. 3. An imaging assembly as in claim 1, wherein the frame is adapted to mate with one or more retention brackets of a radiation emitter. 4. An imaging assembly as in claim 3, wherein the frame is adapted to mate with one or more retention brackets of a radiation emitter in only two orientations. 5. An imaging assembly as in claim 4, wherein the frame is adapted to mate with one or more retention brackets of a radiation emitter in a first orientation such that the shield covers the majority, but not the entirety, of a top half of a radiation emitter aperture; andwherein the frame is adapted to mate with one or more retention brackets of a radiation emitter in a second orientation such that the shield covers the majority, but not the entirety, of a top half of the radiation emitter aperture. 6. An imaging assembly as in claim 1 further comprising first indicia and second indicia where, the shield, frame, or both include the first indicia on a front side;wherein the shield, frame, or both include the second indicia on a back side; andwherein the first indicia and second indicia are different. 7. An imaging assembly comprising:a frame having an aperture with an aperture length and an aperture width;a first shield and a second shield, the first shield having a first shield length that is less than half the aperture length, the second shield having a second shield length that is less than half the aperture length, and each shield having a width equal to or greater than the aperture width;each shield being adapted to move within the aperture,the at least one shield being positioned within the aperture; andwherein the first shield and second shield nest in a tongue-and-groove manner. 8. An imaging assembly as in claim 7 wherein the length of the first shield is less than ⅓ of the length of the aperture and the length of the second shield is ⅓ of the length of the aperture. 9. An imaging assembly as in claim 7 comprising N shields, each shield having a length and wherein the length of one or more of N shields is less than [1/(N+1)] times the length of the aperture. 10. An imaging assembly as in claim 7 comprising N shields, each shield having a length and wherein the length of each of the N shields is less than [1/(N+1)] times the length of the aperture. 11. An imaging apparatus comprising:a radiation emitter having at least one retention bracketa frame having an aperture with an aperture length and an aperture width; the frame being adapted to mate with the at least one retention bracket;at least one shield having a shield length and a shield width such that the shield width is greater than or equal to the aperture width and the shield length is less than half the aperture length and wherein the at least one shield is positioned within the aperture; anda radiation detector,a cabinet housing the radiation detector such that the radiation detector is adapted to move within the cabinet and be retained within the cabinet in a plurality of positions;the cabinet further comprising a front face having thereon printed indicia;the printed indicia comprising at definition of least an upper zone having an upper zone bottom line and a lower zone having a lower zone top line, where the upper zone and lower zone overlap such that the upper zone bottom line and lower zone top line define an overlap zone. 12. An imagining apparatus as in claim 11, wherein radiation detector is substantially the upper zone and the lower zone are substantially the same size, and the radiation detector is substantially the same size as the upper zone. 13. An imaging apparatus as in claim 11 wherein the upper zone is positioned on the front face such that it substantially covers the radiation detector when the radiation detector is in an upper most position in the cabinet. 14. An imaging apparatus as in claim 13 wherein the lower zone is positioned on the front fact such that it substantially covers the radiation detector when the radiation detector is in a lowermost position in the cabinet. 15. An imaging apparatus as in claim 12 wherein the cabinet, front face, and radiation emitter are oriented such that when the frame is mated with the retention bracket such that the shield is in a lower position, the shield blocks substantially all radiation emitted from the radiation emitter from contacting the lower zone with the exception of the portion of the lower zone that is within the overlap zone and such that when the frame is mated with the retention bracket such that the shield is in an upper position, the shield blocks substantially all radiation emitted from the radiation emitter from contacting the upper zone with the exception of the portion of the upper zone that is within the overlap zone.