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

CPC分类号： G06T5/002 ,  G06T5/50 ,  G06T2200/12 ,  G06T2207/10081 ,  G06T2207/30004 ,  Y10S378/901

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。

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

CPC分类号： A61B6/032 ,  A61B6/027 ,  Y10S378/901

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。

公开(公告)号：US06393090B1

公开(公告)日：2002-05-21

申请号：US09410161

申请日：1999-09-30

申请人： Jiang Hsieh ,  Robert F. Senzig

发明人： Jiang Hsieh ,  Robert F. Senzig

IPC分类号： G01N2300

CPC分类号： G01N23/06 ,  A61B6/022 ,  A61B6/032 ,  A61B6/4085

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。

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

CPC分类号： A61B6/032 ,  A61B6/4085 ,  A61B6/4233

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。

公开(公告)号：US06359956B1

公开(公告)日：2002-03-19

申请号：US09739027

申请日：2000-12-15

申请人： Jiang Hsieh ,  Jianying Li

发明人： Jiang Hsieh ,  Jianying Li

IPC分类号： A61B603

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/4085

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。

公开(公告)号：US06332013B1

公开(公告)日：2001-12-18

申请号：US09473341

申请日：1999-12-28

申请人： Jiang Hsieh

发明人： Jiang Hsieh

IPC分类号： A61B603

CPC分类号： G06T11/005 ,  A61B6/027 ,  A61B6/583 ,  G06T2211/421 ,  Y10S378/901

摘要： In one aspect, the present invention is a method for filtering projection data of a computed tomographic scan of an object. The method includes steps of: acquiring projection data representing a tilted, helical scan of an object; zero padding the acquired projection data; determining a Fourier transform of the zero padded projection data; determining a product of the Fourier transform of the zero padded projection data, a ramp function, and a phase shift function; and determining an inverse Fourier transform of the multiplied, transformed projection data as filtered projection data. The above-described method provides filtered data that produces compensated tilted, helically scanned CT images having significantly better spatial resolution than those methods employing a high frequency kernel boost.

摘要翻译： 一方面，本发明是用于过滤对象的计算机断层摄影扫描的投影数据的方法。 该方法包括以下步骤：获取表示对象的倾斜螺旋扫描的投影数据; 零填充所获取的投影数据; 确定零填充投影数据的傅里叶变换; 确定零填充投影数据的傅里叶变换，斜坡函数和相移函数的乘积; 并且确定所乘积的经变换的投影数据的傅立叶逆变换作为滤波投影数据。上述方法提供了滤波数据，该滤波数据产生具有比采用高频内核提升的方法具有明显更好的空间分辨率的补偿的倾斜的螺旋扫描的CT图像。

公开(公告)号：US06307910B1

公开(公告)日：2001-10-23

申请号：US09479015

申请日：2000-01-07

申请人： Kishore C. Acharya ,  Jiang Hsieh ,  Kenneth G. Dunahee ,  Steven J. Woloschek

发明人： Kishore C. Acharya ,  Jiang Hsieh ,  Kenneth G. Dunahee ,  Steven J. Woloschek

IPC分类号： H61B603

CPC分类号： A61B6/541 ,  A61B6/032 ,  G01N23/046 ,  G01N2223/419 ,  G01N2223/612 ,  G06T11/005 ,  G06T2211/412 ,  G06T2211/436

摘要： Methods and corresponding apparatus for imaging a portion of a patient's body with a computed tomographic imaging system configured to scan the patient's body at a cyclically varying view angle, in which the imaging system includes a radiation source and detector array providing a fan angle width of image data. In one embodiment, the method includes axially scanning the portion of the patient's body, gating the radiation source on over less than a 360 °view angle cycle of the axial scan, acquiring image data of the portion of the patient's body during at least a portion of the time the radiation source is gated on, and assembling the acquired image data into an image of the portion of the patient's body.

摘要翻译： 用于利用计算机断层成像系统对患者身体的一部分进行成像的方法和相应装置，所述计算机断层摄影系统被配置为以循环变化的视角扫描患者身体，其中所述成像系统包括辐射源和提供图像的扇角宽度的检测器阵列 数据。 在一个实施例中，该方法包括轴向扫描患者身体的部分，在轴向扫描的小于360°的视角周期上选通辐射源，在至少一部分内获取患者身体部分的图像数据 放射源被选通的时间，以及将获取的图像数据组装成患者身体的该部分的图像。

公开(公告)号：US06292531B1

公开(公告)日：2001-09-18

申请号：US09261352

申请日：1999-03-03

申请人： Jiang Hsieh

发明人： Jiang Hsieh

IPC分类号： A61B604

CPC分类号： A61B6/502 ,  A61B6/02 ,  A61B6/4028 ,  A61B6/4233

摘要： The present invention, in one form, includes an imaging system having a moving x-ray source and a movable detector array to generate depth information mammography images. More specifically, the depth information images are generated by collecting projection data from a plurality of projection angles. In one embodiment, the projection angle is altered by alter the x-axis position of an x-ray source and a detector array so that the entire object of interest remains within the field of view of the imaging system. The depth information mammography images improve diagnosis and pathology location information.

摘要翻译： 本发明以一种形式包括具有移动X射线源和可移动检测器阵列的成像系统，以产生深度信息乳房摄影图像。 更具体地，通过从多个投影角收集投影数据来生成深度信息图像。 在一个实施例中，通过改变x射线源和检测器阵列的x轴位置来改变投影角度，使得整个关注物体保持在成像系统的视场内。 深度信息乳房X线照相图像改善诊断和病理位置信息。

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

CPC分类号： A61B6/504 ,  A61B6/027 ,  A61B6/032 ,  A61B6/481 ,  Y10S378/901

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。

公开(公告)号：US5761333A

公开(公告)日：1998-06-02

申请号：US914697

申请日：1997-08-19

申请人： Jiang Hsieh ,  Stanley H. Fox

发明人： Jiang Hsieh ,  Stanley H. Fox

IPC分类号： G06T5/00 ,  G06K9/00

CPC分类号： G06T7/0081 ,  G06T5/008 ,  G06T7/0012 ,  G06T2207/10081 ,  G06T2207/30016

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。