X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1997-01-30
1998-06-30
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378901, A61B 603
Patent
active
057745196
ABSTRACT:
In an improved CT scanner calibration method and apparatus, a radiation beam, for example an x-ray beam, is directed at a plurality of radiation detectors. The beam is attenuated by a phantom of known attenuation characteristics. The detectors generate measured attenuation data from the attenuated beam. The measured attenuation data is back-projected to generate a measured phantom image. The measured phantom image is converted to an ideal phantom image. The ideal phantom image is forward projected to generate ideal attenuation data. Calibration values for each detector channel in the scanner are generated by cross-referencing the ideal and measured attenuation data. In a preferred embodiment, this cross-referenced data is compressed and stored in a look-up table for referencing during later interrogation of subjects. This technique takes advantage of the inherent mechanical accuracy of the scanner to perform calibration, rather than imposing requirements of phantom geometry precision or exact phantom placement
REFERENCES:
patent: 4352020 (1982-09-01), Horiba et al.
patent: 5214578 (1993-05-01), Cornuejols et al.
patent: 5442674 (1995-08-01), Picard et al.
Lindstrom Walter W.
McCauley, Jr. John Scott
Analogic Corporation
Bruce David Vernon
Porta David P.
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