X-ray or gamma ray systems or devices – Accessory – Testing or calibration
Patent
1995-12-21
1998-11-10
Porta, David P.
X-ray or gamma ray systems or devices
Accessory
Testing or calibration
378162, 378163, G01D 1800
Patent
active
058355634
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.
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Bani-Hashemi Ali Reza
Navab Nassir
Ahmed Adel A.
Porta David P.
Siemens Corporate Research Inc.
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