X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1997-11-26
1999-10-05
Bruce, David Vernon
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378 4, 378901, A61B 603
Patent
active
059636149
ABSTRACT:
Filtering algorithms which offer tradeoffs between slice profile widening and the noise and mAs, reduction are described. In one embodiment, the FWHM is adjusted based on the helical pitch to provide a constant reduction of noise. The percentage increase of FWHM is a function of helical pitch as described below in more detail. The amount of projection data used to reconstruct an image is fixed, independent of the helical pitch. In another embodiment, a roughly constant percentage increase of FWHM is maintained while the amount of reduction of mAs or noise decreases as helical pitch increases. The amount of projection data used to reconstruct an image is also a function of helical pitches. The above described filters provide that for various helical pitches, the filter maintains the same amount of mAs or noise reduction, or maintains the same percentage increase of FWHM. Such filters can be implemented without significantly increasing the processing time.
REFERENCES:
patent: 5430783 (1995-07-01), Hu et al.
Hu Hui
Shen Yun
Beulick John S.
Bruce David Vernon
Cabou Christian G.
General Electric Company
Price Phyllis Y.
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