Methods and apparatus for compensating computed tomographic channel ganging artifacts
    51.
    发明授权
    Methods and apparatus for compensating computed tomographic channel ganging artifacts 有权
    用于补偿计算机断层摄影通道组合人造物的方法和装置

    公开(公告)号:US06535572B2

    公开(公告)日:2003-03-18

    申请号:US09882770

    申请日:2001-06-15

    IPC分类号: A61B603

    摘要: A CT imaging system and method are provided in which groups of adjacent detector elements of a detector array are ganged in an x-direction; and an object is scanned using the ganged groups of adjacent detector elements to acquire projection data. In one embodiment, to reduce degradation of images resulting from the ganged detector elements, an image of the object is reconstructed utilizing the acquired projection data and an adjusted iso-channel of the multislice detector array different from an iso-channel defined for scans performed without utilizing ganged groups of detector elements.

    摘要翻译: 提供了一种CT成像系统和方法,其中检测器阵列的相邻检测器元件组沿x方向组合; 并且使用相邻检测器元件的组合组来扫描对象以获取投影数据。 在一个实施例中,为了减少由组合的检测器元件产生的图像的劣化,使用所获取的投影数据和多重检测器阵列的经调整的等通道来重建对象的图像,其不同于为没有 利用组合的探测器元件。

    Methods and apparatus for high pitch helical computed tomography image reconstruction
    53.
    发明授权
    Methods and apparatus for high pitch helical computed tomography image reconstruction 失效
    高螺距螺旋计算机断层扫描图像重建方法与装置

    公开(公告)号:US06490334B1

    公开(公告)日:2002-12-03

    申请号:US09896957

    申请日:2001-06-29

    IPC分类号: A61B603

    摘要: There is therefore provided, in one aspect, a method for imaging an object utilizing a computed tomographic (CT) imaging system having a rotating gantry, a multislice detector array on the rotating gantry and using at least n>1 rows of detector channels, and a radiation source on the rotating gantry configured to project a beam of radiation towards the multislice detector array through an object to be imaged. The method includes helically scanning the object with the CT imaging system at a pitch p>n to acquire projection data from the n rows of detector channels; applying a combined helical weight and conjugate weight to at least a portion of the acquired projection data to produce virtual projection data compensating for incomplete helical row data of the acquired projection data; and reconstructing an image of the object utilizing the acquired projection data and the virtual projection data.

    摘要翻译: 因此,在一个方面中,提供一种利用具有旋转机架的计算机断层摄影(CT)成像系统对成像进行成像的方法,在旋转机架上使用多层检测器阵列并且至少使用n> 1行检测器通道,以及 旋转台架上的辐射源被配置成通过待成像的物体将辐射束投射到多层检测器阵列。 该方法包括用间距p> n的CT成像系统螺旋扫描物体,以从n行检测器通道获取投影数据; 对所获取的投影数据的至少一部分应用组合的螺旋重量和共轭权重,以产生补偿所获取的投影数据的不完整螺旋行数据的虚拟投影数据; 以及使用所获取的投影数据和虚拟投影数据来重建对象的图像。

    Methods and apparatus for cone-tilted parallel sampling and reconstruction
    54.
    发明授权
    Methods and apparatus for cone-tilted parallel sampling and reconstruction 有权
    锥倾斜平行取样和重构的方法和装置

    公开(公告)号:US06490333B1

    公开(公告)日:2002-12-03

    申请号:US10034135

    申请日:2001-12-28

    申请人: Jiang Hsieh

    发明人: Jiang Hsieh

    IPC分类号: A61B603

    摘要: A method for reconstructing a computed tomographic (CT) image of an object is provided. The method includes initializing a CT imaging system in a step-and-shoot mode, scanning an object to generate a plurality of adjacent axial scans, wherein the distance between the adjacent axial scans is approximately equal to a projected detector height at the detector iso-center, and reconstructing an image of the object using the adjacent axial scans.

    摘要翻译: 提供了一种用于重建物体的计算机断层摄影(CT)图像的方法。 该方法包括以逐步模式初始化CT成像系统,扫描对象以产生多个相邻的轴向扫描,其中相邻轴向扫描之间的距离近似等于检测器等离子体处的投影检测器高度, 中心,并使用相邻的轴向扫描重建对象的图像。

    Methods and apparatus for tube-spit correction
    55.
    发明授权
    Methods and apparatus for tube-spit correction 有权
    管it矫正的方法和装置

    公开(公告)号:US06466645B1

    公开(公告)日:2002-10-15

    申请号:US09721320

    申请日:2000-11-22

    IPC分类号: H65G126

    CPC分类号: G06T11/005 Y10S378/901

    摘要: In one aspect, the present invention relates to tube-spit detection and correction. In an exemplary embodiment, and once a sample of projection data has been collected, the projection data is preprocessed in accordance with known preprocessing algorithms including applying a detector primary speed correction to the projection data. Such primary speed correction removes contamination of previous signal sample from the current sample. After primary speed correction, tube-spit detection is performed on the sample. Such detection can be performed using many different methods. Generally, the objective is to determine whether the x-ray source experienced a drop in power. If a tube-spit event is not detected, then processing proceeds with further preprocessing and image reconstruction. If a tube-spit event is detected, then a tube spit correction is performed. Generally, the objective of tube-spit correction is to remove image artifacts due to the occurrence of a tube-spit event. Many different methods can be utilized to perform tube-spit correction.

    摘要翻译: 在一个方面,本发明涉及管口检测和校正。 在示例性实施例中,并且一旦已经收集了投影数据的样本,则根据已知的预处理算法对投影数据进行预处理,包括对投影数据应用检测器一次速度校正。 这种一次速度校正可以消除来自当前样品的先前信号样本的污染。 在主速度校正之后,对样品进行管喷检测。 这种检测可以使用许多不同的方法进行。 通常,目的是确定x射线源是否遭受功率下降。 如果没有检测到管唾液事件,则处理继续进行进一步的预处理和图像重建。 如果检测到管痰事件,则执行管痰修正。 通常,管口修正的目的是消除由于管it事件的发生引起的图像伪影。 可以使用许多不同的方法进行管it修正。

    Methods and apparatus for compensating for view aliasing artifacts
    56.
    发明授权
    Methods and apparatus for compensating for view aliasing artifacts 有权
    用于补偿视图混叠伪影的方法和装置

    公开(公告)号:US06438195B1

    公开(公告)日:2002-08-20

    申请号:US09771198

    申请日:2001-01-26

    申请人: Jiang Hsieh

    发明人: Jiang Hsieh

    IPC分类号: A61B603

    摘要: Methods and apparatus to reduce and eliminate aliasing artifacts generated as a result of performing high speed scans are described. In one embodiment, the method includes the steps of applying a weighting function to the projection data, and determining an aliasing index from the weighted data. The aliasing index per view is utilized to determine the region and the amount of synthesized views required to reduce the aliasing artifact.

    摘要翻译: 描述了减少和消除由于执行高速扫描而产生的混叠伪像的方法和装置。 在一个实施例中,该方法包括以下步骤:对投影数据应用加权函数,以及从加权数据确定混叠索引。 每个视图的混叠索引用于确定减少混叠伪像所需的区域和合成视图的数量。

    Methods and apparatus for helical image artifact reduction
    57.
    发明授权
    Methods and apparatus for helical image artifact reduction 有权
    用于螺旋图像伪影减少的方法和装置

    公开(公告)号:US06421411B1

    公开(公告)日:2002-07-16

    申请号:US09853145

    申请日:2001-05-10

    申请人: Jiang Hsieh

    发明人: Jiang Hsieh

    IPC分类号: A61B600

    摘要: Methods and apparatus are provided for reducing image artifacts from a computed tomography (CT) image generated using a CT system. A plurality of projection views of an object are obtained and a plane of reconstruction including reconstructed images is defined. A smoothing function is applied to the reconstructed images to reduce image artifacts wherein a greater amount of z-smoothing is applied to images located a greater distance from an iso-center.

    摘要翻译: 提供了用于减少使用CT系统产生的计算机断层摄影(CT)图像的图像伪影的方法和装置。 获得对象的多个投影视图,并且定义包括重建图像的重建平面。 将平滑功能应用于重建图像以减少图像伪像,其中将更大量的z平滑应用于距离等中心更大距离的图像。

    Computed tomography scout images with depth information
    58.
    发明授权
    Computed tomography scout images with depth information 失效
    具有深度信息的计算机断层摄影监视图像

    公开(公告)号:US06393090B1

    公开(公告)日:2002-05-21

    申请号:US09410161

    申请日:1999-09-30

    IPC分类号: G01N2300

    摘要: The present invention, in one form, is a method for generating depth information images of an object using a computed tomography system by performing multiple scout scans of the object, generating a scout image for each scout scan, and displaying the scout images from each scout scan at least once. As a result, the multiple scout images contain depth information of anatomical objects and 3D images are rapidly generated without increasing the cost of the system.

    摘要翻译: 一种形式的本发明是一种使用计算机断层摄影系统生成对象的深度信息图像的方法,通过对对象进行多次侦察扫描,为每个侦察扫描生成侦察图像,并且显示来自每个侦察器的侦察图像 扫描至少一次。 结果,多个侦察图像包含解剖对象的深度信息,并且快速地生成3D图像而不增加系统的成本。

    Method and apparatus for region of interest multislice CT scan
    59.
    发明授权
    Method and apparatus for region of interest multislice CT scan 有权
    感兴趣区域多层CT扫描的方法和装置

    公开(公告)号:US06385278B1

    公开(公告)日:2002-05-07

    申请号:US09560171

    申请日:2000-04-28

    申请人: Jiang Hsieh

    发明人: Jiang Hsieh

    IPC分类号: A61B603

    摘要: In one embodiment, the present invention is a method for reducing radiation dosage when scanning an region of interest of an object with a multi-slice computed tomography (CT) imaging system. The method includes steps of collimating the radiation beam of the CT imaging system into a fan-shaped radiation beam having at least a first region and a second region, the first region having a lesser angular extent than that of the second region; scanning an object having a region of interest (ROI) with the collimated radiation beam- and reconstructing an image of the object using the attenuation measurements collected during the scan, wherein the reconstruction utilizes attenuation measurements collected using the second region of the radiation beam to estimate projection data from portions of the object outside of the ROI blocked by the collimation.

    摘要翻译: 在一个实施方案中,本发明是用多切片计算机断层摄影(CT)成像系统扫描对象的感兴趣区域时减少辐射剂量的方法。 该方法包括将CT成像系统的辐射束准直成具有至少第一区域和第二区域的扇形辐射束的步骤,第一区域的角度范围小于第二区域的角度范围; 使用准直辐射束扫描具有感兴趣区域(ROI)的物体,并使用在扫描期间收集的衰减测量值来重建物体的图像,其中重建利用使用辐射束的第二区域收集的衰减测量来估计 投影数据来自被准直所阻挡的ROI外部的对象的部分。

    Reconstruction in helical computed tomography using asymmetric modeling of detector sensitivity
    60.
    发明授权
    Reconstruction in helical computed tomography using asymmetric modeling of detector sensitivity 失效
    螺旋计算机断层扫描重建使用检测器灵敏度的不对称建模

    公开(公告)号:US06359956B1

    公开(公告)日:2002-03-19

    申请号:US09739027

    申请日:2000-12-15

    IPC分类号: A61B603

    摘要: Helical acquisition of thin computed tomography slices by collimation of the fan beam to less than the width of a multi-row detector is provided by interpolation after application of the weighting scheme correcting for asymmetry in the detector profile of the detectors with such collimation.

    摘要翻译: 通过对采用这种准直的检测器的检测器轮廓中的不对称性进行校正的加权方案之间的内插来提供通过扇形光束准直小于多行检测器宽度的薄计算机断层摄影切片的螺旋获取。