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1. 发明申请

WO2004015632A1 RECONSTRUCTION METHOD FOR TILTED-GANTRY COMPUTED TOMOGRAPHY 审中-公开
标题翻译：倾斜计算机图像的重建方法
公开(公告)号：WO2004015632A1
公开(公告)日：2004-02-19
申请号：PCT/IB2003/003105
申请日：2003-07-11
申请人： KONINKLIJKE PHILIPS ELECTRONICS N.V. , U.S. PHILIPS CORPORATION , VAN DE HAAR, Peter, G.
发明人： VAN DE HAAR, Peter, G.
IPC分类号： G06T11/00
CPC分类号： G06T11/005 , A61B6/027 , A61B6/032 , A61B6/4447 , Y10S378/901
摘要： A computed tomography apparatus (10) for performing volumetric helical imaging acquires helical computed tomography imaging data (72) using a tilted gantry geometry. In the tilted gantry geometry, a rotational plane of a rotating radiation source (16) is tilted at an angle (?) with respect to a direction (Z) of linear motion of a subject. A transform processor (40) transforms (74) the imaging data (72) to a zero tilt geometry. A rebinning processor (50) rebins (110) the transformed imaging data (76) to a non sheared detector window. A reconstruction processor (54) reconstructs (130) the transformed and rebinned imaging data (112) to generate a three dimensional image representation (132). Optionally, an image transform processor (56) transforms (134) the reconstructed image representation (132) with an inverse of the zero tilt geometry transformation (74).
摘要翻译：用于执行体积螺旋成像的计算机断层摄影装置（10）使用倾斜台架几何获取螺旋计算机断层成像数据（72）。在倾斜台架几何形状中，旋转辐射源（16）的旋转平面相对于被摄体的线性运动的方向（Z）以角度（θ）倾斜。变换处理器（40）将（74）成像数据（74）变换为零倾斜几何形状。重组处理器（50）将转换的成像数据（76）重新（110）到非剪切检测器窗口。重建处理器（54）重构（130）经变换和重新组合的成像数据（112）以产生三维图像表示（132）。可选地，图像变换处理器（56）利用零倾斜几何变换（74）的倒数变换（134）重建图像表示（132）。

2. 发明申请

WO2005006257A2 AN IMAGING SYSTEM, AN X-RAY IMAGING APPARATUS, A METHOD AND A COMPUTER PROGRAM ARRANGED FOR REDUCING AN ARTIFACT IN A THREE-DIMENSIONAL RECONSTRUCTED VOLUME 审中-公开
标题翻译：成像系统，X射线成像装置，方法和计算机程序，用于减少三维重构体积中的文学
公开(公告)号：WO2005006257A2
公开(公告)日：2005-01-20
申请号：PCT/IB2004/051135
申请日：2004-07-06
申请人： KONINKLIJKE PHILIPS ELECTRONICS N.V. , VAN DE HAAR, Peter, G. , TIMMER, Jan
发明人： VAN DE HAAR, Peter, G. , TIMMER, Jan
IPC分类号： G06T15/00
CPC分类号： A61B6/4225 , A61B6/583 , A61B6/585 , G06T5/009 , G06T5/50 , G06T2200/04 , G06T2207/10116
摘要： The invention relates to an imaging system (15) comprising artifact reduction means (20) arranged to correct for a ring-shaped artifact in the three-dimensional reconstructed volume. The artifact reduction means (20) comprises a first stage correction means (21) arranged to eliminate the structured noise of the output screen of the image intensifier of an X-ray imaging apparatus (10) using a first corrective image. Preferably, the first corrective image (21a) is pre-calculated and is stored in a suitable memory unit of a computer (not shown). A raw image of the patient is first processed with the first corrective image (21a). The thus obtained gain-corrected image is forwarded to an image deformation correction means (23), where a suitable unwarping function (23a) is being pre-stored. The resulting gain-corrected unwarped images are then made available to the second stage gain correction means (25), where a second corrective image (25a) is applied to the images resulting in a final set of images with a substantially reduced ring-shaped artifact. The final set of images is made available to the image reconstruction means (26) arranged for further processing of the final set of images, the result thereof being visualized on a computer monitor (30) for inspection purposes. The invention further relates to an X-ray imaging apparatus, a method for reducing an artifact in a three-dimensional reconstructed volume and a computer program.
摘要翻译：本发明涉及一种成像系统（15），其包括伪像减少装置（20），其被布置为校正三维重建体积中的环形伪影。人造物减少装置（20）包括第一级校正装置（21），其被布置成使用第一校正图像来消除X射线成像装置（10）的图像增强器的输出屏幕的结构噪声。优选地，第一校正图像（21a）被预先计算并存储在计算机（未示出）的合适的存储器单元中。首先用第一校正图像（21a）处理患者的原始图像。如此获得的增益校正图像被转发到图像变形校正装置（23），其中正在预存储适当的不正确功能（23a）。然后将所得的增益校正的未被绘制的图像提供给第二级增益校正装置（25），其中将第二校正图像（25a）应用于图像，导致具有基本上减小的环形伪像的最终图像组。为了进一步处理最终图像集，图像重建装置（26）可以获得最终图像，其结果在计算机监视器（30）上可视化以供检查。本发明还涉及X射线成像装置，用于减少三维重建体积中的伪影的方法和计算机程序。

3. 发明申请

WO2005006257A3 AN IMAGING SYSTEM, AN X-RAY IMAGING APPARATUS, A METHOD AND A COMPUTER PROGRAM ARRANGED FOR REDUCING AN ARTIFACT IN A THREE-DIMENSIONAL RECONSTRUCTED VOLUME 审中-公开
标题翻译：一种用于减少三维重建体积中的伪影的成像系统，X射线成像装置，方法和计算机程序
公开(公告)号：WO2005006257A3
公开(公告)日：2005-10-27
申请号：PCT/IB2004051135
申请日：2004-07-06
申请人： KONINKL PHILIPS ELECTRONICS NV , VAN DE HAAR PETER G , TIMMER JAN
发明人： VAN DE HAAR PETER G , TIMMER JAN
IPC分类号： A61B6/00 , A61B6/02 , G06T5/00 , G06T11/00
CPC分类号： A61B6/4225 , A61B6/583 , A61B6/585 , G06T5/009 , G06T5/50 , G06T2200/04 , G06T2207/10116
摘要： The invention relates to an imaging system (15) comprising artifact reduction means (20) arranged to correct for a ring-shaped artifact in the three-dimensional reconstructed volume. The artifact reduction means (20) comprises a first stage correction means (21) arranged to eliminate the structured noise of the output screen of the image intensifier of an X-ray imaging apparatus (10) using a first corrective image. Preferably, the first corrective image (21a) is pre-calculated and is stored in a suitable memory unit of a computer (not shown). A raw image of the patient is first processed with the first corrective image (21a). The thus obtained gain-corrected image is forwarded to an image deformation correction means (23), where a suitable unwarping function (23a) is being pre-stored. The resulting gain-corrected unwarped images are then made available to the second stage gain correction means (25), where a second corrective image (25a) is applied to the images resulting in a final set of images with a substantially reduced ring-shaped artifact. The final set of images is made available to the image reconstruction means (26) arranged for further processing of the final set of images, the result thereof being visualized on a computer monitor (30) for inspection purposes. The invention further relates to an X-ray imaging apparatus, a method for reducing an artifact in a three-dimensional reconstructed volume and a computer program.
摘要翻译：本发明涉及包括伪影减少装置（20）的成像系统（15），所述伪影减少装置（20）被布置成校正三维重建体积中的环形伪影。伪影减少装置（20）包括第一级校正装置（21），其被布置为使用第一校正图像来消除X射线成像设备（10）的图像增强器的输出屏幕的结构化噪声。优选地，第一校正图像（21a）被预先计算并且被存储在计算机（未示出）的合适的存储单元中。首先用第一矫正图像处理患者的原始图像（21a）。如此获得的经增益校正的图像被传送到图像变形校正装置（23），在该图像变形校正装置中预先存储了合适的非扭曲函数（23a）。然后使得到的经增益校正的未变形图像可用于第二级增益校正装置（25），其中第二校正图像（25a）被应用于图像，导致具有显着减小的环形伪影的最终图像组。最后一组图像可用于图像重构装置（26），该图像重建装置（26）被布置用于进一步处理最终图像集合，其结果在计算机监视器（30）上可视化以用于检查目的。本发明还涉及一种X射线成像装置，一种用于减少三维重建体积中的伪影的方法以及一种计算机程序。

4. 发明申请

WO2005093663A1 APPARATUS AND METHOD FOR 3D-X-RAY IMAGING 审中-公开
标题翻译： 3D-X射线成像的装置和方法
公开(公告)号：WO2005093663A1
公开(公告)日：2005-10-06
申请号：PCT/IB2005/050943
申请日：2005-03-18
申请人： KONINKLIJKE PHILIPS ELECTRONICS N.V. , VAN DE HAAR, Peter, G.
发明人： VAN DE HAAR, Peter, G.
IPC分类号： G06T11/00
CPC分类号： G06T11/005 , A61B6/4233 , A61B6/4441 , A61B6/466 , A61B6/482 , G06T2211/404
摘要： Apparatus for 3D-x-ray imaging of an object, comprising a system having an x-ray source and an x-ray image detector which both are adjustable with respect to the object in order to obtain in use at least one series of 2D-images of the object, and a processor connected to the detector for calculating a 3D-image of the object derived from the series of 2D-images, whereby the system operates at different intensity levels to at least obtain a first series of 2D-images at a low intensity level and a second series of 2D-images at a high intensity level, and which low intensity level is predetermined at a point to substantially avoid saturation of the x-ray image detector, and whereby the processor is arranged to merge the images from the first series of 2D-images with corresponding images from the second series of 2D-images prior to calculating the 3D-image.
摘要翻译：一种用于物体的3D-X射线成像的装置，包括具有x射线源和x射线图像检测器的系统，它们都可相对于物体调节，以便在使用中获得至少一系列2D- 物体的图像，以及连接到检测器的处理器，用于计算从该系列2D图像导出的对象的3D图像，由此系统以不同的强度水平操作以至少获得第一系列的2D图像高强度水平的低强度水平和第二系列2D图像，并且在一点处预先确定低强度水平以基本避免x射线图像检测器的饱和，并且由此处理器被布置成合并图像在计算3D图像之前，从第二系列2D图像和来自第二系列2D图像的相应图像。

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