Patent Number: 
Section: claims

1. An apparatus for retrofitting an intraoral radiology positioning device comprised of an aiming ring, a bite block and a sensor basket attached to a guide arm, comprising:a near side cover;a far side cover; anda first collimation plate with a first collimation aperture;wherein the near side cover and the far side cover are adapted so as to releasably attach together about the aiming ring so as to hold the first collimation plate and position the first collimation plate so that the first collimation aperture restricts the size of an X-ray beam traveling through the aiming ring;wherein the near side cover is adapted to be positioned adjacent to a near side surface of the aiming ring while the far side cover is adapted to be positioned adjacent to a far side surface of the aiming ring so that the aiming ring is positioned between the near side cover and the far side cover and neither the near side cover nor the far side cover is mechanically secured by itself to the aiming ring. 2. The apparatus of claim 1, wherein the first collimation plate is removable from the near and far side covers. 3. The apparatus of claim 2, further comprising a second collimation plate adapted to be held by the near and far side covers, said second collimation plate having a second collimation aperture of a different size than that of the first collimation aperture. 4. The apparatus of claim 1, wherein the first collimation plate is a single plate held by one of the near side cover and the far side cover. 5. The apparatus of claim 4, wherein the first collimation plate is releasably held by one of the near side cover and the far side cover. 6. The apparatus of claim 1, wherein the first collimation plate is adjustable between a first aperture size and a second aperture size. 7. The apparatus of claim 1, wherein the near side cover and the far side cover are held together by a snap fit. 8. An apparatus, comprising:an intraoral radiology positioning device comprised of an aiming ring, a bite block and a sensor basket attached to a guide arm;a near side cover;a far side cover; anda first collimation plate with a first collimation aperture;a second collimation plate with a first collimation aperture of a different size that that of the first collimation aperture;wherein the near side cover and the far side cover are adapted so as to releasably attach together about the aiming ring so as to hold the first collimation plate and the second collimation plate and position the first collimation plate and the second collimation plate so that the first collimation aperture and the second collimation aperture restrict the size of an X-ray beam traveling through the aiming ring;wherein the near side cover is adapted to be positioned adjacent to a near side surface of the aiming ring while the far side cover is adapted to be positioned adjacent to a far side surface of the aiming ring so that the aiming ring is positioned between the near side cover and the far side cover and neither the near side cover nor the far side cover is mechanically secured by itself to the aiming ring; andwherein at least one of the first and the second collimation plates is removable from the near and far side covers. 9. The apparatus of claim 8, wherein both the first collimation plate and the second collimation plate are removable from the near and far side covers. 10. A method for retrofitting an intraoral radiology positioning device comprised of an aiming ring, a bite block and a sensor basket attached to a guide arm, comprising the steps of:releasably attaching a near side cover and a far side cover together about the aiming ring so as to hold a collimation plate and position the collimation plate so that the collimation aperture restricts the size of an X-ray beam traveling through the aiming ring wherein the near side cover is positioned adjacent to a near side surface of the aiming ring while the far side cover is positioned adjacent to a far side surface of the aiming ring so that the aiming ring is positioned between the near side cover and the far side cover and neither the near side cover nor the far side cover is mechanically secured by itself to the aiming ring. 11. The method of claim 10, comprising the further step of adjusting the size of the collimation aperture between a first aperture size and a second aperture size. 12. The method of claim 11, wherein the size of the collimation aperture is adjusted by substituting a second collimation plate for the collimation plate. 13. An apparatus for retrofitting an intraoral radiology positioning device comprised of an aiming ring, a bite block and a sensor basket attached to a guide arm, comprising:a near side cover;a far side cover; anda collimation plate with a collimation aperture;wherein the near side cover and the far side cover are adapted so as to releasably attach together about the aiming ring so as to hold the collimation plate and position the collimation plate so that the collimation aperture restricts the size of an X-ray beam traveling through the aiming ring;wherein the collimation plate is comprised of a near side collimation plate held by the near side cover and a far side collimation plate held by the far side collimation plate. 14. The apparatus of claim 13, wherein the near side collimation plate is releasably held by the near side cover and the far side collimation plate is releasably held by the far side cover. 15. The apparatus of claim 6, wherein the first collimation plate is adjustable between the first aperture size and the second aperture size by use of at least one sliding shutter that can be moved between two or more positions.