Methods and apparatus for predicting contrast agent uptake in a computed tomography system
    81.
    发明授权
    Methods and apparatus for predicting contrast agent uptake in a computed tomography system 失效
    在计算机断层摄影系统中预测造影剂摄取的方法和装置

    公开(公告)号:US06236706B1

    公开(公告)日:2001-05-22

    申请号:US09521292

    申请日:1996-12-12

    申请人: Jiang Hsieh

    发明人: Jiang Hsieh

    IPC分类号: A61B603

    摘要: The present invention, in one form, is a system which predicts contrast agent uptake in an organ of interest. In accordance with one embodiment, and after the contrast agent has been administered to a patient, a prep scan is performed to determine a base contrast agent uptake measurement. A predictive algorithm is then applied to the base measurement to predict a subsequent contrast agent uptake measurement. The predicted subsequent measurement is then compared to a scanning parameter. Particularly, if the predicted subsequent measurement satisfies the scanning parameter, then an image scan is initiated. If the predicted subsequent measurement does not satisfy the scanning parameter, however, then an additional prep scan is performed to determine a new base contrast agent uptake measurement. The predictive algorithm is then applied to the new base measurement to predict a subsequent contrast agent uptake measurement. The prep scans and predictions are repeated until the predicted subsequent contrast agent uptake measurement satisfies the scanning parameter.

    摘要翻译: 本发明以一种形式是一种预测感兴趣器官中造影剂摄取的系统。 根据一个实施方案,并且在将造影剂施用于患者之后,进行准备扫描以确定基础造影剂吸收测量。 然后将预测算法应用于基础测量以预测随后的造影剂吸收测量。 然后将预测的后续测量与扫描参数进行比较。 特别地,如果预测的后续测量满足扫描参数,则开始图像扫描。 然而,如果预测的后续测量不满足扫描参数,则执行附加的准备扫描以确定新的基础造影剂吸收测量。 然后将预测算法应用于新的基础测量以预测随后的造影剂摄取测量。 重复准备扫描和预测,直到预测的后续造影剂摄取测量满足扫描参数。

    Contrast enhancement for CT systems
    82.
    发明授权
    Contrast enhancement for CT systems 失效
    CT系统的对比度增强

    公开(公告)号:US5761333A

    公开(公告)日:1998-06-02

    申请号:US914697

    申请日:1997-08-19

    IPC分类号: G06T5/00 G06K9/00

    摘要: The present invention, in one form, is a method for improving grey-white matter differentiation between regions of an image to be reconstructed from data obtained by a CT scan. More particularly, in accordance with one form of the present invention, a re-mapping function is utilized to generate CT numbers. In accordance with such function, CT numbers that are outside the grey-white matter region are not "stretched". The CT numbers within such region are "stretched" with the larger "stretch" centered on the grey-white matter region and tapering off at the boundary. Using such a function, grey-white matter differentiation is improved without adversely affecting quality and accuracy.

    摘要翻译: 本发明在一种形式中是一种通过CT扫描得到的数据来改善待重建图像的区域之间的灰白质差异的方法。 更具体地,根据本发明的一种形式,利用重映射功能来产生CT数。 根据这样的功能,在灰白色区域外的CT数字不会“拉伸”。 该区域内的CT数“拉伸”,以灰白色区域为中心的较大的“拉伸”被拉伸,并在边界逐渐变细。 使用这样的功能,灰白质分化改善而不会不利地影响质量和精度。

    Methods and apparatus for image reconstruction in a multislice computed
tomography system
    83.
    发明授权
    Methods and apparatus for image reconstruction in a multislice computed tomography system 失效
    多层计算机断层摄影系统中图像重建的方法和装置

    公开(公告)号:US5732118A

    公开(公告)日:1998-03-24

    申请号:US755892

    申请日:1996-12-02

    申请人: Jiang Hsieh

    发明人: Jiang Hsieh

    IPC分类号: A61B6/03

    摘要: The present invention, in one form, is a system for obtaining data measurement signals for producing a tomographic image of an object in a multislice scan. More specifically, detector cells in at least one channel of a detector array are electrically coupled, or ganged, so that the ganged channel provides one data measurement signal to be transmitted through the gantry slip ring. The signal distribution in the z-direction for the ganged channel is then determined using signals obtained by adjacent non-ganged detector cells.

    摘要翻译: 本发明在一种形式中是用于获得用于产生多层扫描中的物体的断层图像的数据测量信号的系统。 更具体地,检测器阵列的至少一个通道中的检测器单元电耦合或组合,使得联动通道提供一个通过台架滑环传输的数据测量信号。 然后使用由相邻非联合检测器单元获得的信号来确定用于联合通道的z方向上的信号分布。

    Methods and apparatus for reducing partial volume image artifacts
    84.
    发明授权
    Methods and apparatus for reducing partial volume image artifacts 失效
    减少部分体积图像伪影的方法和装置

    公开(公告)号:US5727041A

    公开(公告)日:1998-03-10

    申请号:US747639

    申请日:1996-11-13

    申请人: Jiang Hsieh

    发明人: Jiang Hsieh

    IPC分类号: A61B6/03 G06T1/00

    CPC分类号: A61B6/032 Y10S378/901

    摘要: The present invention, in one form, is a method for improving image quality in Computed Tomography systems by using a partial volume artifact estimation algorithm. In accordance with one embodiment of the algorithm, an object of interest is scanned to generate image data. The image data is segmented into low attenuation data and high attenuation data. A gradient image is generated for two adjacent slices of the image data. The gradient image is then forward projected and squared. The squared gradient image is an estimation of partial volume artifacts in the image data, and therefore is removed from the image data.

    摘要翻译: 本发明以一种形式,是通过使用部分体积假象估计算法来提高计算机断层成像系统中的图像质量的方法。 根据算法的一个实施例,扫描感兴趣的对象以生成图像数据。 图像数据被分割成低衰减数据和高衰减数据。 为图像数据的两个相邻切片生成渐变图像。 然后梯度图像向前投影和平方。 平方梯度图像是对图像数据中的部分体积伪像的估计,因此从图像数据中去除。

    Adaptive filter for reducing streaking artifacts in x-ray tomographic
images
    86.
    发明授权
    Adaptive filter for reducing streaking artifacts in x-ray tomographic images 失效
    自适应滤波器,用于减少X射线断层图像中的条纹伪像

    公开(公告)号:US5416815A

    公开(公告)日:1995-05-16

    申请号:US87568

    申请日:1993-07-02

    申请人: Jiang Hsieh

    发明人: Jiang Hsieh

    IPC分类号: A61B6/03 G01N23/04 G01N23/083

    摘要: Streaking artifacts in a computed tomography x-ray image are reduced by adaptively filtering each set of projection data. The adaptive filter produces an error vector (.theta.) by low-pass filtering the projection data (P) and subtracting the error vector (.theta.) from the projection data (P) prior to image reconstruction. A window function generator controls the low-pass filter as a function of x-ray detector readings.

    摘要翻译: 通过对每组投影数据进行自适应滤波,减少计算机断层摄影X射线图像中的伪像。 自适应滤波器通过对投影数据(P)进行低通滤波并在图像重建之前从投影数据(P)中减去误差向量(θ)来产生误差向量(θ)。 窗口函数发生器控制低通滤波器作为x射线探测器读数的函数。