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1.发明授权Method for helical windmill artifact reduction with noise restoration for helical multislice CT 失效螺旋式风车神经降低方法，用于螺旋多层CT的噪声恢复公开(公告)号：US07623691B2
公开(公告)日：2009-11-24
申请号：US10912183
申请日：2004-08-06
IPC分类号： G06K9/00
CPC分类号： G06T5/002 , A61B6/027 , G06T5/003 , G06T5/50 , G06T2207/10081 , G06T2207/20221 , G06T2207/30004
摘要： A method of removing an imaging artifact in a medical image, including obtaining a first plurality of images, the first plurality of images collectively defining a first image volume; filtering the first plurality of images to create a second plurality of images, each image in the second plurality of images comprising an average of at least two images in the first plurality of images; selecting a first image from the first plurality of images; adding a lost noise image to a second image in the second plurality of images to create a noise restored image, the second image in the second plurality of images corresponding to the first image in the first plurality of images; determining a gradient image based on pixel values in the second plurality of images, the gradient image comprising a gradient value at each pixel location in the second image; and combining, based on the determined gradient image, the first image and the noise restored image to obtain a corrected image that does not contain the imaging artifact.
摘要翻译： 一种去除医学图像中的成像伪影的方法，包括获得第一多个图像，所述第一多个图像共同限定第一图像体积; 过滤所述第一多个图像以创建第二多个图像，所述第二多个图像中的每个图像包括所述第一多个图像中的至少两个图像的平均值; 从所述第一多个图像中选择第一图像; 在所述第二多个图像中将丢失的噪声图像添加到第二图像以创建噪声恢复图像，所述第二多个图像中的所述第二图像对应于所述第一多个图像中的所述第一图像; 基于所述第二多个图像中的像素值确定梯度图像，所述梯度图像包括在所述第二图像中的每个像素位置处的梯度值; 并且基于所确定的梯度图像合并第一图像和噪声恢复图像，以获得不包含成像伪像的校正图像。
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2.发明授权公开(公告)号：US07359478B2
公开(公告)日：2008-04-15
申请号：US10990464
申请日：2004-11-18
IPC分类号： A61B6/03
CPC分类号： G06T11/005 , A61B6/027 , G06T2211/432 , Y10S378/901
摘要： A method, system, and computer program product for compensating for the unavailability of projection data of a scanned object at a selected point, the selected point located outside a detection range of a detector. The method include the steps of obtaining projection data of the scanned object, and compensating for the unavailability of the projection data at the selected point based on the obtained projection data and coordinates of the selected point relative to the detector. The compensating step includes determining at least one complementary projection angle and coordinates of at least one complementary point based on a source projection angle and the coordinates of the selected point relative to the detector, and estimating the projection data value at the selected point based on the acquired projection data, the at least one complementary projection angle, and the coordinates of the at least one complementary point.
摘要翻译： 一种方法，系统和计算机程序产品，用于补偿在选定点处扫描对象的投影数据的不可用性，该选定点位于检测器的检测范围之外。 该方法包括以下步骤：基于所获得的投影数据和相对于检测器的所选点的坐标来补偿所选择的投影数据的不可用性，从而获得扫描对象的投影数据。 补偿步骤包括基于源投影角度和所选点相对于检测器的坐标来确定至少一个互补点的至少一个互补投影角度和坐标，以及基于所选择的点估计所选点处的投影数据值 所获取的投影数据，所述至少一个互补投影角以及所述至少一个互补点的坐标。
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3.发明授权Method and system for reconstructing computed tomography images using redundant data 有权使用冗余数据重建计算机断层摄影图像的方法和系统公开(公告)号：US06778630B2
公开(公告)日：2004-08-17
申请号：US10103781
申请日：2002-03-25
IPC分类号： A61B603
CPC分类号： G06T11/005 , A61B6/027 , Y10S378/901
摘要： A method and system for reconstructing an x-ray image from a partial orbit through the use of a “virtual” fan angle. The virtual fan angle is determined based upon the range of angular positions spanned by a source in a CT instrument or a selected smaller angle. Exposure data is obtained and he virtual fan angle is used to weight the exposure data. Image reconstruction can then proceed using the weighted exposure data. The described methods and system also function for data collected over a complete orbit.
摘要翻译： 通过使用“虚拟”风扇角度从部分轨道重建X射线图像的方法和系统。 虚拟风扇角度是根据CT仪器中的光源所跨度的角度位置或选定的较小角度来确定的。 获得曝光数据，并使用虚拟风扇角度对曝光数据进行加权。 然后可以使用加权曝光数据进行图像重建。 所描述的方法和系统还对完整轨道上收集的数据起作用。
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公开(公告)号：US08611630B1
公开(公告)日：2013-12-17
申请号：US13152997
申请日：2011-06-03
IPC分类号： G06K9/00
CPC分类号： G06T7/0012 , G06T7/246 , G06T11/005 , G06T11/006 , G06T2207/10081 , G06T2211/412 , G06T2211/416 , G06T2211/421
摘要： The methods and systems of the present invention is an algorithm which estimates motion inside objects that change during the scan. The algorithm is flexible and can be used for solving the misalignment correction problem and, more generally, for finding scan parameters that are not accurately known. The algorithm is based on Local Tomography so it is faster and is not limited to a source trajectory for which accurate and efficient inversion formulas exist.
摘要翻译： 本发明的方法和系统是估计在扫描期间变化的物体内的运动的算法。 该算法是灵活的，可用于解决不对准校正问题，更一般地，用于找到不准确知道的扫描参数。 该算法基于局部层析成像，因此它更快，并不局限于存在精确有效的反演公式的源轨迹。
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5.发明授权Method and system for multi-detector-row computed tomography utilizing projection data up-sampling with shift 有权使用投影数据向上采样与移位的多检测器行计算机断层摄影的方法和系统公开(公告)号：US08385620B2
公开(公告)日：2013-02-26
申请号：US12262283
申请日：2008-10-31
IPC分类号： A61B6/03
CPC分类号： G06T11/005
摘要： A computed tomography apparatus and method where data is upsampled with shifting to produce upsampled data. The data is shifted up and down in the same amount in the z-direction, and then upsampled through interpolation. An image is reconstructed using the upsampled data. The process is preferably performed column-by-column. An upsampling shift and interpolation kernel size can be adaptive to the data z-gradient.
摘要翻译： 一种计算机断层摄影装置和方法，其中数据被上采样以移位以产生上采样的数据。 数据在z方向上以相同的量上下移动，然后通过插值进行上采样。 使用上采样数据重建图像。 该方法优选逐列进行。 上采样移位和插值内核大小可以适应于数据的z-梯度。
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6.发明授权Scattered radiation correction method and scattered radiation correction apparatus 有权散射辐射校正方法和散射辐射校正装置公开(公告)号：US07912180B2
公开(公告)日：2011-03-22
申请号：US12388947
申请日：2009-02-19
申请人： Yu Zou , Michael D. Silver , Satoru Ohishi , Kozo Sato
发明人： Yu Zou , Michael D. Silver , Satoru Ohishi , Kozo Sato
IPC分类号： G01N23/201 , G01N23/00
CPC分类号： A61B6/032 , A61B6/5282 , G06T5/003 , G06T5/50 , G06T2207/10081 , G06T2207/20224 , G06T2207/30004
摘要： Scattered radiation is estimated by using a reduced image generated from a projection image, and the scattered radiation image of the projection image is acquired by enlargement processing. The scattered radiation correction of the projection image is executed by subtracting the obtained scattered radiation image from the projection image. In addition, when a primary X-ray image and a scattered radiation image in each projection direction are to be obtained by sequential approximation calculation, a primary X-ray image which has already been identified in an adjacent projection direction is used as a first estimated value (initially set value) in next sequential calculation.
摘要翻译： 通过使用从投影图像生成的缩小图像来估计散射辐射，并且通过放大处理获取投影图像的散射辐射图像。 通过从投影图像中减去所获得的散射辐射图像来执行投影图像的散射辐射校正。 此外，当通过顺序近似计算要获得每个投影方向上的主X射线图像和散射辐射图像时，将已经在相邻投影方向上识别的主X射线图像用作第一估计 值（初始设定值）。
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7.发明申请SYSTEM AND METHOD FOR TOMOGRAPHIC RECONSTRUCTION UTILIZING CIRCULAR TRAJECTORY AND SCANOGRAM TO REDUCE ARTIFACTS 审中-公开使用圆形轨迹和扫描方法进行人造脊椎重建的系统和方法，以减少人造物公开(公告)号：US20090213985A1
公开(公告)日：2009-08-27
申请号：US12238079
申请日：2008-09-25
IPC分类号： H05G1/60
摘要： A computed tomography apparatus and method using line data estimated from circle data and scanogram data. An image of a subject is reconstructed using the circle data and the estimated line data. The circle data and scanogram data may be weighted in estimating the line data. The apparatus and method are useful in diminishing or eliminating streak artifacts in reconstructed images such as images including the spine.
摘要翻译： 一种使用从圆形数据和扫描数据估计的线数据的计算机断层摄影装置和方法。 使用圆形数据和估计行数据重建对象的图像。 可以在估计线数据时加权圆数据和扫描图数据。 该装置和方法可用于减少或消除重建图像（例如包括脊柱的图像）中的条纹伪影。
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8.发明申请SYSTEM AND METHOD FOR TOMOGRAPHIC RECONSTRUCTION UTILIZING CIRCULAR TRAJECTORY AND SCANOGRAM TO REDUCE ARTIFACTS 有权使用圆形轨迹和扫描方法进行人造脊椎重建的系统和方法，以减少人造物公开(公告)号：US20110317805A1
公开(公告)日：2011-12-29
申请号：US13178094
申请日：2011-07-07
摘要： A computed tomography apparatus and method using line data estimated from circle data and scanogram data. An image of a subject is reconstructed using the circle data and the estimated line data. The circle data and scanogram data may be weighted in estimating the line data. The apparatus and method are useful in diminishing or eliminating streak artifacts in reconstructed images such as images including the spine.
摘要翻译： 一种使用从圆形数据和扫描数据估计的线数据的计算机断层摄影装置和方法。 使用圆形数据和估计行数据重建对象的图像。 可以在估计线数据时加权圆数据和扫描图数据。 该装置和方法可用于减少或消除重建图像（例如包括脊柱的图像）中的条纹伪影。
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9.发明申请METHOD, APPARATUS, AND COMPUTER-READABLE MEDIUM FOR PRE-RECONSTRUCTION DECOMPOSITION AND CALIBRATION IN DUAL ENERGY COMPUTED TOMOGRAPHY 有权方法，装置和计算机可读介质，用于双重能量计算机图像中的预重建分解和校准公开(公告)号：US20090262997A1
公开(公告)日：2009-10-22
申请号：US12106907
申请日：2008-04-21
申请人： Yu ZOU , Michael D. Silver
发明人： Yu ZOU , Michael D. Silver
CPC分类号： G06T11/005 , A61B6/583 , G06T2211/408 , G06T2211/424
摘要： A method of obtaining a computed tomography image of an object includes determining linear terms and non-linear beam hardening terms in a pair of line integral equations for dual-energy projection data from inserting average and difference from average attenuation terms, obtaining an initial solution of the line integral equation by setting the non-linear beam hardening terms to zero, and iteratively solving the line integral equations to obtain one line integral equations for each basis material. Attenuation by the first basis material corresponds to a photoelectric attenuation process, and attenuation by the second basis material corresponds to a Compton attenuation process. The line integral equations can be inverted by an inverse Radon procedure such as filtered backprojection to give images of each basis material. The images of each basis material can then be optionally combined to give monochromatic images, density and effective atomic number images, or photoelectric and Compton processes images.
摘要翻译： 获得对象的计算机断层摄影图像的方法包括：从插入平均值和平均衰减项之间的双能量投影数据的一对线性积分方程中确定线性项和非线性束强化项，获得初始解 通过将非线性束硬化项设置为零，并迭代求解线积分方程以获得每个基础材料的一个线积分方程，即线积分方程。 第一基材的衰减对应于光电衰减过程，第二基材的衰减对应于康普顿衰减过程。 线性积分方程可以通过反向Radon程序反转，例如滤波反投影，以给出每种基础材料的图像。 然后可以选择地组合每个基材的图像以产生单色图像，密度和有效的原子序数图像，或光电和康普顿处理图像。
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公开(公告)号：US5889833A
公开(公告)日：1999-03-30
申请号：US877211
申请日：1997-06-17
申请人： Michael D. Silver
发明人： Michael D. Silver
CPC分类号： A61B6/504 , A61B6/027 , A61B6/032 , G06T11/005 , Y10S378/901
摘要： An x-ray computed tomography device and method where backprojection is performed with pixels each having their own back projection range. The range is determined using a two-dimensional completeness condition such that every line through a reconstructed slice must intercept the projection of the source orbit onto the plane of the slice. The completeness condition provides an adequate amount of data for the back projection to maintain quality of the reconstructed image while allowing a higher helical pitch ratio. This is advantageous in situations where fast scanning is desired, such as patient screening and CT-angiography. The method and device are preferably applied to a helical cone beam system. The backprojection can be performed using cone-beam projection data obtained with a helical scan or after sorting the projection data into parallel-beam ray-sums in the transverse plane while maintaining the cone angle. The sorting advantageously further increases the helical pitch ratio and thus increases scanning speed and reduces scanning time. The two types of backprojection may each use either the full projection data set or a minimal data set determined based upon the completeness condition.
摘要翻译： 一种x射线计算机断层摄影装置和方法，其中每个具有其自己的背投影范围的像素执行反投影。 使用二维完整性条件确定范围，使得通过重构的切片的每条线必须截取源轨道到切片平面上的投影。 完整性条件为后投影提供足够数量的数据，以保持重建图像的质量，同时允许更高的螺距比。 这在需要快速扫描的情况下是有利的，例如患者筛查和CT血管造影。 该方法和装置优选地应用于螺旋锥形束系统。 可以使用通过螺旋扫描获得的锥形束投影数据或在将投影数据分组成横向平面中的平行光束和并保持锥角的同时进行反投影。 排序有利地进一步增加了螺距，从而增加了扫描速度并缩短了扫描时间。 两种类型的反投影可以各自使用完全投影数据集或基于完整性条件确定的最小数据集。
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