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公开(公告)号：US20070177713A1
公开(公告)日：2007-08-02
申请号：US10597871
申请日：2005-02-04
申请人： Thomas Kohler , Roland Proksa , Claas Bontus
发明人： Thomas Kohler , Roland Proksa , Claas Bontus
CPC分类号： G06T11/005 , A61B6/027 , G06T2211/412
摘要： Motion is one of the most critical sources of artifacts in helical conebeam CT. By comparing opposite rays corresponding to projection data, the amount of motion may be estimated and, in the following suppression of corresponding motion artifacts may be performed according to an exemplary embodiment of the present invention. The method of motion artifact compensation may be implemented in both approximate reconstruction algorithms and exact reconstruction algorithms. Advantageously, motion during the data acquisition is detected automatically and related motion artifacts may be suppressed adaptively.
摘要翻译： 运动是螺旋锥束CT中最重要的文物来源之一。 通过比较与投影数据相对应的相对射线，可以估计运动量，并且可以根据本发明的示例性实施例来执行以下对相应运动伪像的抑制。 运动伪像补偿的方法可以在近似重建算法和精确重构算法中实现。 有利地，自动检测数据采集期间的运动，并且可以自适应地抑制相关的运动伪像。
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公开(公告)号：US06490477B1
公开(公告)日：2002-12-03
申请号：US09303317
申请日：1999-04-30
IPC分类号： A61B505
CPC分类号： A61B6/583 , A61B6/04 , A61B6/08 , A61B6/547 , G05B2219/39029
摘要： An imaging modality, in particular a mobile CT system, comprises an imaging system for imaging an object to be examined. The imaging modality is also provided with an image guided surgery system which includes a position measuring system for measuring positions within the object and a data processor for deriving a transformation between positions within the object and the corresponding positions in the image. The position measuring device is also arranged to measure the position of the imaging system and the data processor is arranged to derive the transformation from the position and/or orientation of the imaging system. The position measuring system is notably an optical position measuring system which is arranged to measure the position of the gantry of the CT system. The data processor is arranged to derive the transformation from the measured position of the gantry. A highly accurate result is obtained when a calibration is carried out which links the position of the CT gantry to the position of the scanning plane.
摘要翻译： 成像模态，特别是移动CT系统，包括用于对被检查对象进行成像的成像系统。 成像模式还提供有图像引导手术系统，其包括用于测量对象内的位置的位置测量系统和用于导出对象内的位置与图像中的对应位置之间的变换的数据处理器。 位置测量装置还被布置成测量成像系统的位置，并且数据处理器被布置成从成像系统的位置和/或取向导出变换。 位置测量系统特别是一种光学位置测量系统，其被布置成测量CT系统的台架的位置。 数据处理器被安排为从台架的测量位置导出变换。 当执行将CT机架的位置与扫描平面的位置联系起来的校准时，获得高度精确的结果。
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23.发明授权公开(公告)号：US06426992B1
公开(公告)日：2002-07-30
申请号：US09921505
申请日：2001-08-02
申请人： Thomas Köhler , Roland Proksa
发明人： Thomas Köhler , Roland Proksa
IPC分类号： A61B603
CPC分类号： G01T1/2985 , A61B6/027 , A61B6/032 , A61B6/4035 , A61B6/4085 , A61B6/4291 , A61B6/482 , Y10S378/901
摘要： The invention relates to a computed tomography apparatus whose radiation source emits a conical radiation beam and is capable of scanning the examination zone along a trajectory in the form of a helix. The detector unit that is connected to the radiation source consists of a plurality of spatially separated detector segments that are mutually offset in the axial direction and each of which is arranged in such a manner that a projection onto the helix covers at least two neighboring turns of the helix. A CT image having an improved and spatially more uniformly distributed signal-to-noise ratio can be reconstructed from the CT data acquired by means of such a detector unit.
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公开(公告)号：US5072183A
公开(公告)日：1991-12-10
申请号：US590444
申请日：1990-09-26
申请人： Graeme McKinnon , Roland Proksa
发明人： Graeme McKinnon , Roland Proksa
CPC分类号： G01R33/3614
摘要： An rf generator for magnetic resonance imaging apparatus including a modulator in which a carrier is modulated with an envelope signal, and a transmitter stage which is connected subsequent to the modulator generator in which the implementation of the modulating signal enables the expenditure for the transmitter stage be substantially reduced in that the modulator comprises a first modulator section in which the envelope signal is converted into a series of equally long digital pulses whose density corresponds to the amplitude of the envelope signal, in that k different kinds of pulses are provided, in that during each pulse of a given kind the carrier is always switched on with a given phase position which deviates from the phase positions of the carrier which are associated with the pulses of the other kinds by 360.degree./k or an integer multiple thereof, and in that the resultant pulse-wise switched, preferably square-wave carrier acts as a switching signal for the transmitter stage.
摘要翻译： 一种用于磁共振成像设备的射频发生器，包括其中载波被包络信号调制的调制器，以及发射机级，其在调制器发生器之后连接，其中调制信号的实现使得发射机级的支出能够 实质上减少了，因为调制器包括第一调制器部分，其中包围信号被转换成一系列等长数字脉冲，其密度对应于包络信号的幅度，在k种不同种类的脉冲中， 给定类型的每个脉冲总是以给定的相位位置开启，给定的相位位置偏离与其他类型的脉冲相关联的载波的相位位置360°/ k或其整数倍，并且 合成的脉冲切换，优选方波载波用作发射机级的切换信号。
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公开(公告)号：US5004983A
公开(公告)日：1991-04-02
申请号：US359620
申请日：1989-06-01
CPC分类号： G01R33/3607
摘要： The invention relates to a circuit arrangement for generating rf signals for MR examinations, comprising a read-only memory in which a signal is stored in the form of a series of data words, an address generator for reading data words from the read-only memory with a clock frequency, and a digital-to-analog converter which succeeds the read-only memory. In order to reduce the required storage capacity, a sinusoidal signal in the form of a series of data words is stored in the memory.
摘要翻译： 本发明涉及一种用于产生用于MR检查的rf信号的电路装置，包括其中以一系列数据字的形式存储信号的只读存储器，用于从只读存储器读取数据字的地址发生器 具有时钟频率和成为只读存储器的数模转换器。 为了减少所需的存储容量，将一系列数据字形式的正弦信号存储在存储器中。
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公开(公告)号：US09230348B2
公开(公告)日：2016-01-05
申请号：US13994775
申请日：2011-12-15
IPC分类号： G06T11/00
CPC分类号： G06T11/003 , G06T11/006 , G06T2211/408 , G06T2211/424
摘要： The noise of a detection value acquired by an imaging system (30) can depend on the contributions of different components within a region of interest to be imaged, which has been traversed by radiation (4) causing the respective acquired detection value. This dependence is considered while iteratively reconstructing an image of the region of interest, wherein first component attenuation values, which correspond to elements of a first component within the region of interest, and second component attenuation values, which correspond to elements of a first component within the region of interest, are determined, wherein noise values are determined from the first component attenuation values and the second component attenuation values and wherein the noise values are used for updating the image. This consideration of the dependence of the noise of an acquired detection value on the different components improves the quality of the iteratively reconstructed image.
摘要翻译： 由成像系统（30）获取的检测值的噪声可以取决于被成像的感兴趣区域内的不同部件的贡献，其已被辐射（4）穿过，导致相应的获取的检测值。 在迭代地重建感兴趣区域的图像的同时考虑这种依赖性，其中对应于感兴趣区域内的第一分量的元素的第一分量衰减值和与第一分量衰减值对应的第二分量衰减值 确定感兴趣区域，其中根据第一分量衰减值和第二分量衰减值确定噪声值，并且其中噪声值用于更新图像。 对所获取的检测值的噪声对不同分量的依赖性的考虑改善了迭代重建图像的质量。
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公开(公告)号：US08842805B2
公开(公告)日：2014-09-23
申请号：US13386906
申请日：2010-07-20
申请人： Roland Proksa
发明人： Roland Proksa
CPC分类号： A61B6/405 , A61B6/032 , A61B6/4021 , A61B6/4233 , A61B6/4241 , A61B6/482 , A61B6/508 , A61B6/542 , A61B6/585 , G01T1/171
摘要： The present invention relates to an X-ray examination device and a corresponding method. A fast and periodical modulation of the X-ray flux within each detection interval is performed having a low X-ray flux at the beginning of the detection interval to ensure that no detection channel is overloaded. With increasing the X-ray flux particularly the peripheral detection channels will rum into saturation, which is detected. A saturated detector channel is stopped from further detecting radiation, and the time of effective radiation detection without saturation is measured for correcting those detection signals. From all detection signals, after any correction of detection signals from saturated detection channels, an X-ray image can be reconstructed.
摘要翻译： 本发明涉及一种X射线检查装置及相应的方法。 在检测间隔开始时，对每个检测间隔内的X射线通量进行快速且周期性的调制，以确保没有检测通道过载。 随着X射线通量的增加，外围探测通道将会进入饱和状态，这是被检测到的。 停止饱和检测器通道进一步检测辐射，并且测量没有饱和的有效辐射检测的时间以校正这些检测信号。 从所有检测信号，在从饱和检测通道检测信号的任何校正之后，可以重建X射线图像。
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公开(公告)号：US08705831B2
公开(公告)日：2014-04-22
申请号：US13394819
申请日：2010-09-21
申请人： Thomas Koehler , Roland Proksa
发明人： Thomas Koehler , Roland Proksa
IPC分类号： G06K9/00
CPC分类号： G06T11/008 , G06T5/50 , G06T2211/421 , G06T2211/424
摘要： The invention relates to an image generation system for generating an image of a region of interest. The image generation system comprises a measured data providing unit for providing measured data of the region of interest, a reconstruction unit (12) for reconstructing a first and a second image of the region of interest from the measured data using a first and a second reconstruction method, a noise determination unit (13) for determining first and second noise values for first and second image elements of the first and second image, and an image element combining unit (14) for combining corresponding first and second image elements into combined image elements forming a combined image based on the first and second noise values. By combining corresponding image elements of two differently reconstructed images based on determined noise values, a combined image of a region of interest can be generated with an improved quality.
摘要翻译： 本发明涉及一种用于产生感兴趣区域的图像的图像生成系统。 图像生成系统包括测量数据提供单元，用于提供感兴趣区域的测量数据;重建单元（12），用于使用第一和第二重构从所测量的数据重构感兴趣区域的第一和第二图像 方法，用于确定第一和第二图像的第一和第二图像元素的第一和第二噪声值的噪声确定单元（13）和用于将对应的第一和第二图像元素组合成组合图像元素的图像元素合成单元（14） 基于第一和第二噪声值形成组合图像。 通过基于确定的噪声值组合两个不同重建图像的相应图像元素，可以以改进的质量生成感兴趣区域的组合图像。
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公开(公告)号：US08653471B2
公开(公告)日：2014-02-18
申请号：US13255518
申请日：2010-02-18
IPC分类号： G01T1/00
CPC分类号： A61B6/4208 , A61B6/032 , A61B6/4014 , A61B6/4042 , A61B6/482 , G01T1/20
摘要： A detector array (110) of an imaging system (100) includes a radiation sensitive detector (114, 116) that detects radiation and generates a signal indicative thereof. A current-to-frequency (I/F) converter (202) converts the signal to a pulse train having a frequency indicative of the signal for an integration period. Circuitry (120) generates a first moment and at least one higher order moment based on the pulse train.
摘要翻译： 成像系统（100）的检测器阵列（110）包括检测辐射并产生指示其的信号的辐射敏感检测器（114,116）。 电流 - 频率（I / F）转换器（202）将信号转换成具有指示用于积分周期的信号的频率的脉冲串。 电路（120）基于脉冲串产生第一时刻和至少一个较高阶矩。
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公开(公告)号：US08615120B2
公开(公告)日：2013-12-24
申请号：US13054097
申请日：2009-07-14
申请人： Roland Proksa
发明人： Roland Proksa
CPC分类号： G06T11/006 , G06T2211/408
摘要： A system includes an image estimator (128) that generates estimated native image data from data acquired when a K-edge material is present in a scanned region during data acquisition, wherein the estimated native image data is indicative of native image data generated from data acquired when the K-edge material is not present in the scanned region during the data acquisition.
摘要翻译： 一种系统包括图像估计器（128），其在数据采集期间当在扫描区域中存在K边缘材料时获取的数据产生估计的本机图像数据，其中所估计的本机图像数据指示从获取的数据生成的本机图像数据 当在数据采集期间K边缘材料不存在于扫描区域中时。
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