Methods and apparatus for reconstruction in helical cone beam volumetric CT
    21.
    发明授权
    Methods and apparatus for reconstruction in helical cone beam volumetric CT 失效
    螺旋锥束体积CT重建方法与装置

    公开(公告)号:US07539281B2

    公开(公告)日:2009-05-26

    申请号:US10966881

    申请日:2004-10-15

    IPC分类号: A61B6/03

    摘要: A method for reconstructing an image of an object utilizing a cone-beam volumetric computed tomographic imaging apparatus includes helically scanning the object with a radiation source utilizing the cone-beam volumetric computed tomographic imaging apparatus, selecting radiation beams emitted by the radiation source passing through a pixel P, a Tam-window, and a Katsevich window, filtering the selected projection data, and reconstructing an image of the object utilizing the filtered selected projection data including projection data within the Katsevich window and outside the Tam-window.

    摘要翻译: 使用锥形束体积计算机断层成像装置重建物体的图像的方法包括利用锥束体积计算机断层成像装置用辐射源对物体进行螺旋扫描,选择通过辐射源的辐射源发射的辐射束 像素P,Tam窗口和Katsevich窗口,对所选择的投影数据进行滤波,并且利用包括Katsevich窗口内和Tam窗口之外的投影数据的滤波的所选择的投影数据来重建对象的图像。

    METHODS AND APPARATUS FOR ARTIFACT REDUCTION
    23.
    发明申请
    METHODS AND APPARATUS FOR ARTIFACT REDUCTION 有权
    减少手艺的方法和装置

    公开(公告)号:US20080292173A1

    公开(公告)日:2008-11-27

    申请号:US12177641

    申请日:2008-07-22

    IPC分类号: G06K9/40

    摘要: A method for facilitating a reduction in image artifacts is provided. The method includes receiving data regarding a scan of an object, reconstructing a plurality of images using the received data to form a three-dimensional image space, determining an orientation for a maximum intensity pixel operation, locating the maximum intensity pixels within a plurality of ray paths in accordance with the determined orientation, and filtering around each maximum intensity pixel along each ray path.

    摘要翻译: 提供了一种便于减少图像伪影的方法。 该方法包括接收关于对象的扫描的数据,使用所接收的数据重建多个图像以形成三维图像空间,确定最大强度像素操作的取向,将最大强度像素定位在多个射线内 根据确定的方向进行路径,并沿着每个射线路径围绕每个最大强度像素进行滤波。

    Systems, methods and apparatus for specialized filtered back-projection reconstruction for digital tomosynthesis
    24.
    发明授权
    Systems, methods and apparatus for specialized filtered back-projection reconstruction for digital tomosynthesis 有权
    用于数字断层合成的专门滤波反投影重建的系统,方法和装置

    公开(公告)号:US07457451B2

    公开(公告)日:2008-11-25

    申请号:US11950418

    申请日:2007-12-04

    IPC分类号: G06K9/00 G01N23/223

    摘要: Systems, methods and apparatus are provided through which in one aspect, a three-dimensional (3D) image of an object is constructed from a plurality of two-dimensional (2D) images of the object using a specialized filter. In some embodiments, the specialized filter implements a linear ramp function, a windowing function, and/or a polynomial function. In some embodiments, the 3D image is back-projected from the filtered two-dimensional images, yielding a 3D image that has improved visual distinction of overlapping anatomic structures and reduced blurring.

    摘要翻译: 提供了一种系统,方法和装置,通过该系统,方法和装置,在一个方面,使用专用滤波器从对象的多个二维(2D)图像构建对象的三维(3D)图像。 在一些实施例中,专用滤波器实现线性斜坡函数,加窗函数和/或多项式函数。 在一些实施例中,3D图像从经过滤的二维图像反投影,产生3D重建解剖结构改善的视觉区别并减少模糊。

    METHOD AND APPARATUS OF RADIOGRAPHIC IMAGING WITH AN ENERGY BEAM TAILORED FOR A SUBJECT TO BE SCANNED
    27.
    发明申请
    METHOD AND APPARATUS OF RADIOGRAPHIC IMAGING WITH AN ENERGY BEAM TAILORED FOR A SUBJECT TO BE SCANNED 有权
    用能够被扫描的能量束的放射成像的方法和装置

    公开(公告)号:US20080013689A1

    公开(公告)日:2008-01-17

    申请号:US11831034

    申请日:2007-07-31

    IPC分类号: G21K3/00

    摘要: A method and apparatus for tailoring the profile of an x-ray beam for radiographic imaging for a specific subject is disclosed. The invention includes a filter assembly having a pair of filters, each of which may be dynamically controlled by a motor assembly during data acquisition. The filters are positionable in the x-ray beam so as to shape the intensity profile of the x-ray beam. In one exemplary embodiment, the filters are dynamically positioned during CT data acquisition based on the shape of the subject. A method of determining the shape of the subject prior to CT data acquisition is also disclosed.

    摘要翻译: 公开了一种用于定制用于特定对象的X射线成像的X射线束的轮廓的方法和装置。 本发明包括具有一对滤波器的滤波器组件,每个滤波器可以在数据采集期间由电机组件动态地控制。 过滤器可以定位在x射线束中,以便形成x射线束的强度分布。 在一个示例性实施例中,基于对象的形状,在CT数据采集期间,滤波器被动态地定位。 还公开了在CT数据采集之前确定对象的形状的方法。

    Step-and-shoot cardiac CT imaging
    28.
    发明授权
    Step-and-shoot cardiac CT imaging 有权
    分步心脏CT成像

    公开(公告)号:US07313213B1

    公开(公告)日:2007-12-25

    申请号:US11160028

    申请日:2005-06-06

    IPC分类号: G01N23/083

    摘要: A CT imaging system has a rotatable gantry, a table movable fore and aft through an opening defined within the rotatable gantry, and a controller that incrementally moves a subject disposed on the table through a number of discrete data acquisition positions for the acquisition of physiologically gated CT data. The controller also coordinates acquisition of imaging data from the subject at a first data acquisition position within a physiological cycle of the subject and only advances the subject to a next data acquisition position if the imaging data acquired at the first data acquisition position is deemed acceptable. The controller also detects irregularities and physiological motion of the subject and responsive thereto, suspends data acquisition until the irregularity passes, such as, suspending data acquisition until a next cardiac cycle if a heart arrhythmia is detected.

    摘要翻译: CT成像系统具有可旋转的台架,通过可旋转机架中限定的开口前后运动的桌子,以及控制器,其通过多个离散的数据采集位置递增地移动设置在桌子上的被摄体,用于采集生理门控 CT数据。 如果在第一数据获取位置处获取的成像数据被认为是可接受的,则控制器还协调在对象的生理周期内的第一数据获取位置处从被摄体获取成像数据,并仅将对象前进到下一个数据采集位置。 控制器还检测对象的不规则和生理运动并响应于此,停止数据采集,直到不规则通过,例如,如果检测到心律不齐,则暂停数据采集直到下一个心动周期。

    Systems and methods for compensating for table sag
    30.
    发明申请
    Systems and methods for compensating for table sag 有权
    用于补偿工作台下垂的系统和方法

    公开(公告)号:US20070003020A1

    公开(公告)日:2007-01-04

    申请号:US11172067

    申请日:2005-06-30

    IPC分类号: G01D18/00

    摘要: A method for compensating for table sag is described. The method includes receiving a first dimension of a table, scanning a patient placed on the table to obtain a first data set, generating an image of the table by performing the scanning with the patient on the table, and determining a difference between the first dimension and a second dimension of the table in the image.

    摘要翻译: 描述了一种用于补偿工作台下垂的方法。 该方法包括:接收桌子的第一维度,扫描放置在桌子上的患者以获得第一数据集,通过与患者在桌子上执行扫描来生成桌子的图像,以及确定第一维度之间的差异 以及图像中的表的第二维度。