Global Patent Index - EP 0974120 A1

EP 0974120 A1 2000-01-26 - 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

EP 0974120 A1 (EN)

Application

EP 98909872 A

Priority

  • NL 9800144 W
  • NL 1005496 A

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 (main, further and additional classification)

G06T 5/00; H04N 5/32; H05G 1/60

IPC 8 full level (invention and additional information)

G06T 5/00 (2006.01); H04N 3/233 (2006.01); H05G 1/64 (2006.01); H04N 5/32 (2006.01)

CPC (invention and additional information)

G06T 5/006 (2013.01); H04N 3/2335 (2013.01); H05G 1/64 (2013.01); H04N 5/32 (2013.01)

Citation (search report)

See references of WO 9840847A1

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 9840847 A1 19980917; EP 0974120 A1 20000126; NL 1005496 C2 19980914

INPADOC legal status


2000-05-31 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 19981214

2000-01-26 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE