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    1.
    发明专利
    未知

    公开(公告)号：DE602005013189D1

    公开(公告)日：2009-04-23

    申请号：DE602005013189

    申请日：2005-02-01

    Applicant: PHILIPS INTELLECTUAL PROPERTY ,  KONINKL PHILIPS ELECTRONICS NV

    Inventor： WIEGERT JENS ,  ROSE GEORG ,  WEESE JUERGEN

    IPC: G06T5/50 ,  G06T11/00

    Abstract: The invention relates to an apparatus and a method for the processing of reconstructed 3D images (I) in C-arm based volume imaging which often exhibit spatially slowly varying inhomogeneities caused by inconsistent projection data. To correct the images (I), a retrospective homogenization procedure is proposed. The image (I) is segmented ( 11, 12 ) into principal classes like bone, tissue and air based on their gray values. Only the tissue-regions (M) are then used as support in order to fit ( 14 ) a spatially slowly varying 2D baseline (B) representing the smooth shape of cupping or other inhomogeneities. Finally the inverse of the estimated 2D baseline is subtracted from the original slice (I) to correct for the inhomogeneities.

    2.
    发明专利
    未知

    公开(公告)号：DE60318737T2

    公开(公告)日：2009-01-15

    申请号：DE60318737

    申请日：2003-11-13

    Applicant: PHILIPS INTELLECTUAL PROPERTY

    Inventor： WEESE JUERGEN ,  HEMPEL DANIEL ,  PEKAR VLADIMIR

    IPC: G06T17/00 ,  G06T15/08

    Abstract: The invention relates to a method and to an apparatus for visualizing a sequence of volume images of a moving object. Methods and apparatus of this kind are used in cases where a sequence of three-dimensional volume images is to be rendered as a two-dimensional image, for example, for a viewer. The invention utilizes the fact that usually only the volume values of a part of the voxels are relevant for the derivation of a two-dimensional image from a volume image. In the case of a sequence of volume images of a moving object, the derivations of the two dimensional images can be accelerated by storing the voxels which are relevant for the visualization during the visualization of a first volume image and by deriving the relevant two-dimensional image during the visualization of a second volume image exclusively from the volume values of the stored voxels and from voxels neighboring such stored voxels. The selection of volume values of neighboring voxels for use is dependent on the motion of the object. The voxels of the second volume image which are relevant for the visualization are stored again and used accordingly for the visualization of a third volume image. These steps are repeated accordingly for further volume images of the sequence.

    3.
    发明专利
    未知

    公开(公告)号：DE60318737D1

    公开(公告)日：2008-03-06

    申请号：DE60318737

    申请日：2003-11-13

    Applicant: PHILIPS INTELLECTUAL PROPERTY

    Inventor： WEESE JUERGEN ,  HEMPEL DANIEL ,  PEKAR VLADIMIR

    IPC: G06T17/00 ,  G06T15/08

    Abstract: The invention relates to a method and to an apparatus for visualizing a sequence of volume images of a moving object. Methods and apparatus of this kind are used in cases where a sequence of three-dimensional volume images is to be rendered as a two-dimensional image, for example, for a viewer. The invention utilizes the fact that usually only the volume values of a part of the voxels are relevant for the derivation of a two-dimensional image from a volume image. In the case of a sequence of volume images of a moving object, the derivations of the two dimensional images can be accelerated by storing the voxels which are relevant for the visualization during the visualization of a first volume image and by deriving the relevant two-dimensional image during the visualization of a second volume image exclusively from the volume values of the stored voxels and from voxels neighboring such stored voxels. The selection of volume values of neighboring voxels for use is dependent on the motion of the object. The voxels of the second volume image which are relevant for the visualization are stored again and used accordingly for the visualization of a third volume image. These steps are repeated accordingly for further volume images of the sequence.

    4.
    发明专利
    未知

    公开(公告)号：DE602004001973T2

    公开(公告)日：2007-10-18

    申请号：DE602004001973

    申请日：2004-01-23

    Applicant: PHILIPS INTELLECTUAL PROPERTY

    Inventor： WEESE JUERGEN ,  RASCHE VOLKER ,  YOUNG STEWART ,  MOVASSAGHI BABAK

    IPC: G06T7/00 ,  G06T5/00 ,  G06T17/10

    Abstract: The invention relates to a method for the computer-aided reconstruction of a three-dimensional anatomical object ( 3 ) from diagnostic image data. First of all, a diagnostic image data set of the object ( 3 ) is acquired. Then a seed point ( 5 ) is set, starting from which the object is reconstructed within a reconstruction volume ( 4 ). Thereafter, an adjacent point of the reconstruction volume ( 4 ) likewise belonging to the object ( 3 ) is located in accordance with a propagation criterion, which is calculated by means of a mathematical analysis of local areas ( 6, 7 ), assigned to the point concerned, of the image data set Reconstruction of the three-dimensional structure of the object ( 3 ) is then performed within the reconstruction volume ( 4 ) by multiple repetition of this method step and propagation along the located adjacent points. To apply such a reconstruction method to image data obtained by means of rotational X-ray imaging, wherein a plurality of two-dimensional projection images ( 1, 2 ) are recorded from different projection directions, the invention proposes that the propagation criterion be calculated by subjecting the local image areas ( 6, 7 ) of the two-dimensional projection images ( 1, 2 ) in each case individually to the mathematical analysis.

    8.
    发明专利
    未知

    公开(公告)号：DE59914623D1

    公开(公告)日：2008-03-13

    申请号：DE59914623

    申请日：1999-11-26

    Applicant: PHILIPS INTELLECTUAL PROPERTY

    Inventor： ZYLKA WALDEMAR ,  SABCZYNSKI JORG ,  WEESE JUERGEN

    IPC: A61B6/00 ,  G01B15/04 ,  G01T1/00 ,  G01T7/00 ,  G06T1/00 ,  G06T3/00

    Abstract: In an X-ray examination device and a method for generating distortion-free X-ray images the imaging properties are calculated and distortions are corrected by providing at least one calibration member (7, 8) for forming a reference pattern; a correction unit (13) corrects the distortions in X-ray images on the basis of the pattern of the calibration members (7, 8) actually formed in the patient X-ray image (FIG. 4) and the calculated reference pattern.

    9.
    发明专利
    未知

    公开(公告)号：DE602004001973D1

    公开(公告)日：2006-09-28

    申请号：DE602004001973

    申请日：2004-01-23

    Applicant: PHILIPS INTELLECTUAL PROPERTY

    Inventor： WEESE JUERGEN ,  RASCHE VOLKER ,  YOUNG STEWART ,  MOVASSAGHI BABAK

    IPC: G06T7/00 ,  G06T5/00 ,  G06T17/10

    Abstract: The invention relates to a method for the computer-aided reconstruction of a three-dimensional anatomical object ( 3 ) from diagnostic image data. First of all, a diagnostic image data set of the object ( 3 ) is acquired. Then a seed point ( 5 ) is set, starting from which the object is reconstructed within a reconstruction volume ( 4 ). Thereafter, an adjacent point of the reconstruction volume ( 4 ) likewise belonging to the object ( 3 ) is located in accordance with a propagation criterion, which is calculated by means of a mathematical analysis of local areas ( 6, 7 ), assigned to the point concerned, of the image data set Reconstruction of the three-dimensional structure of the object ( 3 ) is then performed within the reconstruction volume ( 4 ) by multiple repetition of this method step and propagation along the located adjacent points. To apply such a reconstruction method to image data obtained by means of rotational X-ray imaging, wherein a plurality of two-dimensional projection images ( 1, 2 ) are recorded from different projection directions, the invention proposes that the propagation criterion be calculated by subjecting the local image areas ( 6, 7 ) of the two-dimensional projection images ( 1, 2 ) in each case individually to the mathematical analysis.

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