EP 0974120 A1 20000126 - METHOD FOR CORRECTING IMAGE DISTORTIONS IN AN X-RAY IMAGE
Title (en)
METHOD FOR CORRECTING IMAGE DISTORTIONS IN AN X-RAY IMAGE
Title (de)
VERFAHREN ZUR KORREKTUR VON BILDVERZERRUNGEN IN EINEM RÖNTGENBILD
Title (fr)
PROCEDE POUR CORRIGER UNE DISTORSION D'IMAGE DANS UNE IMAGE RADIOLOGIQUE
Publication
Application
Priority
- NL 9800144 W 19980311
- NL 1005496 A 19970311
Abstract (en)
[origin: WO9840847A1] Method for correcting image distortion in an X-ray image which is obtained with the aid of an X-ray image device with an X-ray source mounted on a rotatable arm, an electrooptical image intensifier device positioned opposite the X-ray source and a digital image processor, comprising a calibration phase, in which deviations of the image are recorded with the aid of a calibration phantom and a correction phase, in which a correction is carried out on the basis of the recorded deviations, wherein the total image distortion is split into a geometrical component and a magnetic component; the geometrical component is split into a part caused by cushion-shaped distortion and a part associated with pixel dimensions; in the calibration phase, the pixel dimensions are calibrated and on the basis of an algorithm which contains exclusively geometrical parameters, the cushion-shaped distortion is determined and corrected; for a number of predetermined calibration positions of the rotatable arm, the residual image distortion is then recorded in a magnetic deformation table valid for at least a number of pixels and the X-ray image is separately corrected for the geometrical deformation and on the basis of the magnetic deformation table in the correction phase.
IPC 1-7
IPC 8 full level
G06T 5/00 (2006.01); H04N 3/233 (2006.01); H05G 1/64 (2006.01); H04N 5/32 (2006.01)
CPC (source: EP)
G06T 5/80 (2024.01); H04N 3/2335 (2013.01); H05G 1/64 (2013.01); H04N 23/30 (2023.01)
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 9840847 A1 19980917; EP 0974120 A1 20000126; NL 1005496 C2 19980914
DOCDB simple family (application)
NL 9800144 W 19980311; EP 98909872 A 19980311; NL 1005496 A 19970311