Calibration apparatus for X-ray geometry
US5835563A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1995 |
| Grant date | Nov 10, 1998 |
| Priority date | — |
| Expiry date | Dec 21, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/12
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Calibration apparatus for X-ray geometry, for use in conjunction with a portion of a patient's body to be X-rayed, an X-ray source, and imaging arrangement for forming an image, wherein the imaging arrangement is at a given orientation and distance from the portion of a patient's body, comprises a calibration ring adapted for being fastened to a portion of a patient's body, such as a patient's head. The ring exhibits a first degree of transparency to X-rays. An encoding arrangement incorporated in the ring comprises a plurality of encoding units exhibiting a second degree of transparency to X-rays, different from the first degree, the encoding units being arranged in a predetermined configuration such that an essentially two-dimensional projected image, formed by the imaging arrangement, of the calibration ring with the encoding arrangement exhibits a pattern of contrasting intensity attributable to at least a portion of the encoding arrangement from which the orientation and distance can be determined uniquely.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.