Image analysis – Applications – Biomedical applications
Patent
1997-07-08
1998-12-01
Shalwala, Bipin
Image analysis
Applications
Biomedical applications
128922, 128925, 2504922, 378 7, 378901, 382275, G06K 900, G06K 940, A61N 500, A61N 600
Patent
active
058450033
ABSTRACT:
The present invention, in one form, corrects any error due to varying z-axis detector cell gains represented in data obtained by a scan in a CT system. In accordance with one form of the present invention, and after correcting the image data for beam-hardening, the data is passed through a highpass filter to remove any data representing relatively slow, or low frequency, changes. Next, the filtered data is clipped and view averaged to remove high frequency data contents due to the objects being imaged. A slope estimate is then created. Using the slope estimate, an error estimate is generated. The error estimate is then subtracted from the beam-hardened corrected data, for example. As a result, errors due to z-axis gain variation of the detector cells are removed from the projection data array.
REFERENCES:
patent: 4858128 (1989-08-01), Nowak
patent: 4897788 (1990-01-01), King
patent: 4994965 (1991-02-01), Crawford et al.
patent: 5046003 (1991-09-01), Crawford
patent: 5165100 (1992-11-01), Hsieh et al.
patent: 5170346 (1992-12-01), Crawford et al.
patent: 5212737 (1993-05-01), Ackelsberg
patent: 5225980 (1993-07-01), Hsieh et al.
patent: 5251128 (1993-10-01), Crawford
patent: 5271055 (1993-12-01), Hsieh et al.
patent: 5287276 (1994-02-01), Crawford et al.
patent: 5297036 (1994-03-01), Grimaud
patent: 5301108 (1994-04-01), Hsieh
patent: 5473656 (1995-12-01), Hsieh et al.
Besson Guy M.
Hoffman David M.
Hu Hui
Beulik John S.
General Electric Company
Pilarski John H.
Shalwala Bipin
LandOfFree
Detector z-axis gain correction for a CT system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Detector z-axis gain correction for a CT system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detector z-axis gain correction for a CT system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2401634