Method and apparatus for correcting bone induced spectral...

Details Method and apparatus for correcting bone induced spectral... Method and apparatus for correcting bone induced spectral...

2005-06-07

2005-06-07

Church, Craig E. (Department: 2882)

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

C378S207000

Reexamination Certificate

active

06904120

ABSTRACT:
The present technique provides for the estimation and correction of bone induced spectral (BIS) artifacts. Spectral matching is employed to approximate the incident X-ray spectrum attenuated by bone and water with an X-ray spectrum attenuated by water alone. A table can be built to express the amount in apparent projection value shift for objects containing bone and water compared with water-like object when their corresponding normalized spectra match. The BIS error may thereby be determined from existing spectral error data obtained from spectral calibration. A corresponding correction factor may be determined from the shift value.

REFERENCES:
patent: 4149081 (1979-04-01), Seppi
patent: 5774519 (1998-06-01), Lindstrom et al.
patent: 6115487 (2000-09-01), Toth et al.

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