公开(公告)号：DE602006019292D1

公开(公告)日：2011-02-10

申请号：DE602006019292

申请日：2006-09-01

Applicant: PHILIPS INTELLECTUAL PROPERTY

Inventor： GRASS MICHAEL ,  ZIEGLER ANDY ,  NIELSEN TIM

IPC: A61B6/03 ,  G06T5/00 ,  G06T5/50 ,  G06T11/00

公开(公告)号：DE602006016424D1

公开(公告)日：2010-10-07

申请号：DE602006016424

申请日：2006-04-07

Applicant: PHILIPS INTELLECTUAL PROPERTY

Inventor： ZIEGLER ANDY

IPC: G01V5/00 ,  G01T1/164 ,  G01T1/29

公开(公告)号：DE602006003077D1

公开(公告)日：2008-11-20

申请号：DE602006003077

申请日：2006-03-09

Applicant: PHILIPS INTELLECTUAL PROPERTY

Inventor： ZIEGLER ANDY ,  GRASS MICHAEL ,  KOEHLER THOMAS

IPC: G06T11/00

Abstract: The invention relates to a method and a device for the iterative reconstruction of cross-sectional images of the heart (7) of a patient based on projections (P1, . . . P5) from different directions which are for example generated with a helical cone-beam CT scanner. A cardiac weight function (f) quantifies how near the projections (P1, . . . ) are to a given observation phase (To) of the heart cycle based on simultaneously recorded electrocardiographic signals (ECG). The whole set of projections (P1, . . . ) is divided into subsets (S1, . . . ) which each contain only projections corresponding to a similar cardiac weight (f), and an iterative reconstruction algorithm like ART uses in one update or iteration step all projections of such a subset (S1, . . . ) simultaneously.

公开(公告)号：DE602008005584D1

公开(公告)日：2011-04-28

申请号：DE602008005584

申请日：2008-06-09

Applicant: MORGAN ELECTRO CERAMICS BV ,  PHILIPS INTELLECTUAL PROPERTY

Inventor： ZIEGLER ANDY ,  GRASS MICHAEL

IPC: G06T11/00

公开(公告)号：DE602007003203D1

公开(公告)日：2009-12-24

申请号：DE602007003203

申请日：2007-03-14

Applicant: PHILIPS INTELLECTUAL PROPERTY

Inventor： ROESSL EWALD ,  ZIEGLER ANDY

IPC: G06T5/50

Abstract: It is described a method for reducing noise of X-ray attenuation data related to a first and second spectral X-ray data acquisition. The method comprises the steps of (a) acquiring data representing the X-ray attenuation behavior of a region of interest, (b) determining a first and a second attenuation-base line integral for the first and the second X-ray acquisition, respectively, and (c) calculating expected first and second signal to noise ratios for the first and the second attenuation-base line integral based on given signal to noise ratios for the first and second spectral X-ray data acquisition, respectively. The method further comprises the steps of (d) repeating the above mentioned steps of determining the attenuation-base line integrals and calculating the expected signal to noise ratios for a further first spectral X-ray data acquisition and (e) selecting improved spectral X-ray data acquisitions in order to enhance the overall signal to noise ratio of a final X-ray image.

公开(公告)号：WO2007140093A9

公开(公告)日：2009-06-18

申请号：PCT/US2007068538

申请日：2007-05-09

Applicant: KONINKL PHILIPS ELECTRONICS NV ,  PHILIPS CORP ,  PHILIPS INTELLECTUAL PROPERTY ,  ZIEGLER ANDY

Inventor： ZIEGLER ANDY

IPC: A61B6/03

CPC classification number: A61B6/4014 ,  A61B6/032 ,  A61B6/508 ,  G06T11/005

Abstract: A tomographic apparatus (10) includes at least two x-ray sources (14) that rotate about and alternately emit radiation into an imaging region (22). The at least two x-ray sources (14) emit radiation from a first set of angular positions during a first data acquisition cycle and from a different set of angular positions during a subsequent data acquisition cycle. At least two sets of detectors (24) detect primary radiation emitted by a corresponding one of the at least two x-ray sources (14) and produce data representative of the detected radiation. An interleaver (32) interleaves the data associated with the first and the subsequent data acquisition cycles for each of the at least two x-ray sources (14).

Abstract translation: 断层摄影装置（10）包括至少两个X射线源（14），其围绕并交替地将辐射发射到成像区域（22）中。 所述至少两个X射线源（14）在第一数据采集周期期间从第一组角位置发射辐射，并且在随后的数据采集周期期间从不同的一组角度位置发射辐射。 至少两组检测器（24）检测由所述至少两个X射线源（14）中的相应一个发射的主辐射，并且产生表示检测到的辐射的数据。 交织器（32）对于至少两个x射线源（14）中的每一个交织与第一和随后的数据采集周期相关联的数据。

公开(公告)号：WO2007031899A3

公开(公告)日：2008-04-17

申请号：PCT/IB2006053055

申请日：2006-09-01

Applicant: PHILIPS INTELLECTUAL PROPERTY ,  KONINKL PHILIPS ELECTRONICS NV ,  GRASS MICHAEL ,  ZIEGLER ANDY ,  NIELSEN TIM

Inventor： GRASS MICHAEL ,  ZIEGLER ANDY ,  NIELSEN TIM

IPC: A61B6/03 ,  G06T5/00 ,  G06T5/50 ,  G06T11/00

CPC classification number: A61B6/032 ,  A61B6/027 ,  A61B6/541 ,  G06T11/006 ,  G06T2211/412 ,  G06T2211/424

Abstract: The increasing cone angle of current high-end and future CT systems leads to a decrease in image quality if approximate cone-beam reconstruction methods are used. According to an exemplary embodiment of the present invention, an iterative four-dimensional cardiac CT reconstruction is provided, in which phase volumes are selected from the four-dimensional data set, each having the same spatial volume at different phase points. Corresponding voxels inside these phase volumes are then forward projected onto the same projection. After calculation of a different projection, these voxels are updated. This may provide for an efficient implementation of an iterative four-dimensional cardiac cone-beam CT reconstruction.

Abstract translation: 目前的高端和未来CT系统的锥角越来越大，如果使用近似锥束重建方法，则会导致图像质量下降。 根据本发明的示例性实施例，提供了一种迭代的四维心脏CT重建，其中从四维数据集中选择相位体积，每个四维数据集在不同相位处具有相同的空间体积。 然后将这些相位体积内的相应体素向前投影到相同的投影上。 在计算了不同的投影之后，这些体素被更新。 这可以提供迭代四维心脏锥束CT重建的有效实施。

公开(公告)号：WO2006000997A3

公开(公告)日：2007-04-26

申请号：PCT/IB2005052090

申请日：2005-06-24

Applicant: PHILIPS INTELLECTUAL PROPERTY ,  KONINKL PHILIPS ELECTRONICS NV ,  NIELSEN TIM ,  ZIEGLER ANDY ,  KOEHLER THOMAS ,  PROKSA ROLAND

Inventor： NIELSEN TIM ,  ZIEGLER ANDY ,  KOEHLER THOMAS ,  PROKSA ROLAND

IPC: G06T11/00

CPC classification number: G06T11/006 ,  A61B6/027 ,  G06T2211/421 ,  Y10S378/901

Abstract: The invention relates to an imaging method, especially a computerized tomography method, with which an object is penetrated by rays from different directions and measured values, which depend upon the intensity of the rays after penetrating the object, are acquired by a detector unit. From these measured values, an object image is reconstructed by means of back projection of measured-value-dependent back projection values. Therein, the object image is divided into overlapping, quasi-spherically symmetric image segments, each being defined by an image value and a quasi-spherically symmetric base function. Furthermore, during the back projection, the back projection values are added in proportions to the image values, wherein the proportion of a back projection value, which is added during the back projection to an image value, is dependent on a proportionality factor, which is equal to the average value of the line integrals of the base function belonging to the respective image value along those rays that have generated the measured value, on which the respective back projection value is dependent.

Abstract translation: 本发明涉及一种成像方法，特别是计算机断层摄影方法，其中物体被来自不同方向的光线穿透，并且测量值取决于穿透物体之后的光线的强度，由检测器单元获取。 从这些测量值，通过背投影测量值依赖的反投影值重建对象图像。 其中，对象图像被划分为重叠的准球形对称图像片段，每个片段由图像值和准球形对称的基本功能定义。 此外，在背投影期间，反投影值以与图像值成比例的方式相加，其中在后投影中添加的反投影值与图像值的比例取决于比例因子，即比例因子 等于属于相应图像值的基本功能的线积分的平均值，沿着相应的背投影值依赖于已经产生测量值的那些射线。

公开(公告)号：WO2007110796A2

公开(公告)日：2007-10-04

申请号：PCT/IB2007050884

申请日：2007-03-15

Applicant: PHILIPS INTELLECTUAL PROPERTY ,  KONINKL PHILIPS ELECTRONICS NV ,  ZIEGLER ANDY ,  ROESSL EWALD

Inventor： ZIEGLER ANDY ,  ROESSL EWALD

CPC classification number: G01T1/2985

Abstract: It is described a method for dynamically optimizing the signal-to-noise ratio of attenuation data related to two different X-ray energies for reconstructing an image of an object under examination. The method comprises (a) estimating the thickness and the material composition of the object at a plurality of different projection angles, (b) for each of the various projection angles calculating for a variety of combinations of different first and second X-ray energies a corresponding common signal-to-noise ratio, (c) for each of the various projection angles choosing the first and the second X-ray energy causing the maximum corresponding common signal-to-noise ratio, and (d) for each of the various projection angles acquiring X-ray attenuation data of the object whereby the two X-ray energies are the X-ray energies causing a maximum signal-to-noise ratio assigned to the respective projection angle.

Abstract translation: 描述了一种用于动态优化与两个不同X射线能量相关的衰减数据的信噪比的方法，用于重建被检查物体的图像。 该方法包括：（a）以多个不同的投影角度估计物体的厚度和材料成分，（b）对于针对不同的第一和第二X射线能量的各种组合计算的各种投影角度中的每一个 相应的公共信噪比，（c）对于选择第一和第二X射线能量的各种投影角度中的每一个引起最大对应的公共信噪比，（d）对于各种 投影角度获取物体的X射线衰减数据，由此两个X射线能量是分配给各个投影角度的最大信噪比的X射线能量。

公开(公告)号：WO2006067671A3

公开(公告)日：2006-09-14

申请号：PCT/IB2005054198

申请日：2005-12-13

Applicant: PHILIPS INTELLECTUAL PROPERTY ,  KONINKL PHILIPS ELECTRONICS NV ,  FORTHMANN PETER ,  KOEHLER THOMAS ,  MANZKE ROBERT ,  GRASS MICHAEL ,  ZIEGLER ANDY

Inventor： FORTHMANN PETER ,  KOEHLER THOMAS ,  MANZKE ROBERT ,  GRASS MICHAEL ,  ZIEGLER ANDY

IPC: A61B6/00 ,  A61B6/03

CPC classification number: A61B6/541 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4085 ,  A61B6/503

Abstract: A method of recording images of the heart in computed tomography is provided in which, in order to prevent movement artifacts, the images are reconstructed on the basis of similar movement states of the heart and different radiation intensities are used for different movement states. During recording operation low-resolution images are continually reconstructed from the recorded data. The movement state of the heart is determined from the low- resolution images, preferably by comparing successive images. During the desired heart phase with little heart movement the power of the X-ray tube is increased. A high-resolution reconstruÌtion is carried out retrospectively from data recorded with a high radiation intensity in similar movement states with little heart movement. Also disclosed are a CT apparatus and a computer program for carrying out the method.

Abstract translation: 提供了一种在计算机断层摄影中记录心脏图像的方法，其中为了防止运动伪像，基于心脏的相似运动状态重建图像，并且不同的辐射强度用于不同的运动状态。 在记录操作期间，从记录的数据中连续重建低分辨率图像。 优选地，通过比较连续图像，从低分辨率图像确定心脏的移动状态。 在期望的心脏移动期间，X射线管的功率增加。 从具有较小的心脏运动的相似运动状态下以高辐射强度记录的数据追溯地进行高分辨率重建。 还公开了一种用于执行该方法的CT装置和计算机程序。