Methods and apparatus for helical reconstruction for multislice CT scan
    71.
    发明授权
    Methods and apparatus for helical reconstruction for multislice CT scan 失效
    用于多层CT扫描的螺旋重建的方法和装置

    公开(公告)号:US06980681B1

    公开(公告)日:2005-12-27

    申请号:US09557108

    申请日:2000-04-24

    申请人: Jiang Hsieh

    发明人: Jiang Hsieh

    摘要: One embodiment of the present invention is a method for imaging an object with a computed tomographic (CT) imaging system that includes steps of helically scanning the object with a multi-slice CT imaging system to acquire attenuation measurements of the object, the measurements including more than two conjugate samples for estimation of a projection at a plane of reconstruction of the object; and filtering and backprojecting the attenuation measurements of the object, including the more than two conjugate samples, to reconstruct at least one image slice of the object. An improved sampling pattern and better use of the attenuation samples obtained during a scan is thus provided.

    摘要翻译: 本发明的一个实施例是一种用计算机断层摄影(CT)成像系统对物体进行成像的方法,所述计算机断层摄影(CT)成像系统包括用多层CT成像系统螺旋扫描物体以获取物体的衰减测量的步骤,所述测量包括更多 比用于估计物体重建平面处的投影的两个共轭样本; 并且对包括多于两个共轭样本的对象的衰减测量进行滤波和反投影来重建对象的至少一个图像切片。 因此提供了在扫描期间获得的衰减样本的改进的采样模式和更好的使用。

    Methods and apparatus for CT smoothing to reduce artifacts
    72.
    发明申请
    Methods and apparatus for CT smoothing to reduce artifacts 审中-公开
    用于CT平滑减少伪像的方法和装置

    公开(公告)号:US20050201605A1

    公开(公告)日:2005-09-15

    申请号:US10798650

    申请日:2004-03-11

    IPC分类号: G06K9/00

    摘要: A method for reconstructing an image of an object includes scanning an object using a computed tomographic (CT) imaging apparatus to acquire projections of the object. A set of thresholds are determined utilizing the projections, and selected smoothing kernels are associated with the thresholds. The method further includes utilizing the smoothing kernels and the projections to produce smoothed projections in accordance with the thresholds and filtering and backprojecting the smoothed projections to generate an image of the object.

    摘要翻译: 用于重建对象的图像的方法包括使用计算机断层摄影(CT)成像设备扫描对象以获取对象的投影。 使用投影来确定一组阈值,并且所选择的平滑内核与阈值相关联。 该方法还包括利用平滑内核和投影来根据阈值产生平滑的投影,并过滤和反投影平滑的投影以生成对象的图像。

    Image space compensation scheme for reducing artifacts
    75.
    发明授权
    Image space compensation scheme for reducing artifacts 有权
    用于减少伪影的图像空间补偿方案

    公开(公告)号:US06570951B1

    公开(公告)日:2003-05-27

    申请号:US10063799

    申请日:2002-05-14

    申请人: Jiang Hsieh

    发明人: Jiang Hsieh

    IPC分类号: A61B603

    摘要: A method and system for reducing artifacts in an x-ray image generated by a computed tomography imaging system using an image space compensation scheme including obtaining reconstructed image data generated using an image reconstruction algorithm, determining a noise variation characteristic for the reconstruction algorithm, filtering the reconstructed image data so as to create smoothed image data and processing the smoothed image data and the reconstructed image data so as to create corrected image data. Also claimed is a medium encoded with a machine-readable computer program code for reducing artifacts in an x-ray image, the medium including instructions for causing controller to implement the aforementioned method.

    摘要翻译: 一种用于减少由使用图像空间补偿方案的计算机断层成像系统产生的X射线图像中的假象的方法和系统,所述图像空间补偿方案包括获得使用图像重构算法生成的重建图像数据,确定重建算法的噪声变化特性, 重建图像数据,以便产生平滑的图像数据并处理平滑的图像数据和重建的图像数据,以便产生校正的图像数据。 还要求保护的是具有用于减少X射线图像中的伪影的机读计算机程序代码的介质,该介质包括用于使控制器实现上述方法的指令。

    Methods and apparatus for compensating computed tomographic channel ganging artifacts
    76.
    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
    78.
    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
    79.
    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
    80.
    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。