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21.发明公开MR SEGMENTATION USING TRANSMISSION DATA IN HYBRID NUCLEAR/MR IMAGING 审中-公开富兰克林/ MR-BILDGEBUNG的MR-SEGMENTIERUNG ANHAND VONÜBERTRAGUNGSDATEN
公开(公告)号：EP2338142A2
公开(公告)日：2011-06-29
申请号：EP09787148.7
申请日：2009-09-09
发明人： GAGNON, Daniel , HU, Zhiquiang
IPC分类号： G06T7/00
CPC分类号： G01R33/481 , G01R33/5608 , G06T7/11 , G06T2207/10088 , G06T2207/10104 , G06T2207/30004
摘要： When correcting attenuation in a nuclear image (e.g., PET or SPECT), an MR-based attenuation correction (AC) map (16) is generated using MR image data (14) of a subject (60). The subject (60) is then placed in a nuclear imaging device with a radioactive point or line source (18, 18') from which transmission data is measured as the patient is imaged. In order to resolve ambiguity between air voxels and bone voxels in the MR-based AC map (16), estimated transmission data (24) is generated from the AC map and compared to the measured transmission data (22) from the point or line source. An error is iteratively calculated for the estimated and measured transmission data, and attenuation values of the AC map (16) are refined to minimize the error. The refined AC map (32) is used to correct attenuation in collected nuclear data (41) which is reconstructed into an attenuation corrected image (99) of the patient.
摘要翻译： 当校正核图像（例如PET或SPECT）中的衰减时，使用对象（60）的MR图像数据（14）来生成基于MR的衰减校正（AC）图（16）。 然后将受试者（60）放置在具有放射性点或线源（18,18'）的核成像装置中，当患者被成像时从该源成像传播数据。 为了解决基于MR的AC映射（16）中的空气体素和骨骼体素之间的模糊性，从AC映射生成估计的传输数据（24），并与来自点或线源的测量的传输数据（22）进行比较 。 对于估计和测量的传输数据迭代地计算误差，并且AC映射（16）的衰减值被改进以使误差最小化。 精细AC图（32）用于校正收集的核数据（41）中的衰减，其被重建成患者的衰减校正图像（99）。
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22.发明授权METHOD AND SYSTEM FOR PET IMAGE RECONSTRUCTION USING PORTIONS OF EVENT DATA 有权方法和系统PET图像重建使用事件的部分数据
公开(公告)号：EP1946271B1
公开(公告)日：2011-05-04
申请号：EP06821254.7
申请日：2006-10-30
IPC分类号： G06T11/00
CPC分类号： A61B6/037 , G06T11/006
摘要： A method and system for use in positron emission tomography, wherein a list-based reconstructor means (129) is configured to generate first portion volumetric data responsive to a first portion of a plurality of positron annihilation events detected during a positron emission tomography scan; generate a human-readable image indicative of the first portion volumetric data; use a list-based reconstruction technique to generate composite volumetric data responsive to the first portion volumetric data and a second portion of the plurality of positron annihilation events; and generate a composite human-readable image indicative of the composite volumetric data. In another aspect the reconstructor (129) is configured to selecting first or second portion event quantities responsive to one or more parameters including image definition requirements and processing time requirements.
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23.发明公开USING NON-ATTENUATION CORRECTED PET EMISSION IMAGES TO COMPENSATE FOR INCOMPLETE ANATOMIC IMAGES 审中-公开校正的PET发射非衰减的使用数字为补偿不完全解剖插图
公开(公告)号：EP2289048A1
公开(公告)日：2011-03-02
申请号：EP09746193.3
申请日：2009-05-04
发明人： HU, Zhiqiang , GAGNON, Daniel , TUNG, Chia-Hua
IPC分类号： G06T11/00
CPC分类号： G06T11/006 , G06T2211/424 , G06T2211/432
摘要： When compensating for truncated patient scan data acquired by a multi-modal PET/CT or PET/MR imaging system (14, 16), such as occurs when a patient is larger than a field of view for an anatomical imaging device, a segmented contour of a non-attenuation-corrected (NAC) PET image is used to identify a contour of the truncated region. An appropriate tissue type is used to fill in truncated regions of a truncated CT or MR image for the attenuation map. The corrected attenuation map is then used to generate an attenuation-corrected PET image of the patient or a region of interest. Alternatively, the system can be employed in PET/CT or PET/MR imaging scenarios where two modalities are performed sequentially (e.g., not simultaneously), and thus the contour derived from the PET scan can be compared to the CT or MR image to infer potential subject motion between the PET and CT or MR scans. Additionally, the system can be employed in PET imaging scenarios where the contour derived from the NAC PET image is used as emission boundary for scatter correction using single-scatter simulation, in which a tail-fitting procedure utilizes an emission boundary to define pure-scatter tails (e.g., in the absence of true coincidence events).
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公开(公告)号：EP2265974A2
公开(公告)日：2010-12-29
申请号：EP09729460.7
申请日：2009-03-20
IPC分类号： G01T1/24
CPC分类号： G01T1/2985 , A61B6/037 , G01R33/481
摘要： When performing positron emission tomography (PET) scanning and image reconstruction, a primary PET system (10) with a primary PET detector array (12) is used to image a patient or subject, and a secondary PET detector array (14) is coupled to the system at specific input points to mitigate unnecessary duplication of system components. The primary system (10) provides PET data processing and reconstruction for the secondary array (14), in addition to the first array (12). An adjustable array (120) includes radially movable detectors (122) and stationary detectors (124) with different crystal resolutions. The movable detectors (122) are alternately positioned with the stationary detectors (124) at a first radius to form a large detector ring, or are positioned at a second, smaller radius without the stationary detectors (124) to form a small detector ring.
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25.发明公开
公开(公告)号：EP1946271A1
公开(公告)日：2008-07-23
申请号：EP06821254.7
申请日：2006-10-30
IPC分类号： G06T11/00
CPC分类号： A61B6/037 , G06T11/006
摘要： A method and system for use in positron emission tomography, wherein a list-based reconstructor means (129) is configured to generate first portion volumetric data responsive to a first portion of a plurality of positron annihilation events detected during a positron emission tomography scan; generate a human-readable image indicative of the first portion volumetric data; use a list-based reconstruction technique to generate composite volumetric data responsive to the first portion volumetric data and a second portion of the plurality of positron annihilation events; and generate a composite human-readable image indicative of the composite volumetric data. In another aspect the reconstructor (129) is configured to selecting first or second portion event quantities responsive to one or more parameters including image definition requirements and processing time requirements.
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公开(公告)号：EP1940290A2
公开(公告)日：2008-07-09
申请号：EP06809318.6
申请日：2006-09-15
摘要： An imaging system (10) comprises a data device (30), which controls radiation data acquisition from a subject positioned in an examination region (18) for an examination. A rebinning processor (40) bins the acquired data periodically into a histogram (42). A transform (70) transforms the histogram (42) into individual independent or uncorrelated components, each component including a signal content and a noise content. A stopping determining device (52) compares an aspect of at least one selected component to a predetermined threshold (TH) and, based on the comparison, terminates the data acquisition.
摘要翻译： 成像系统（10）包括数据设备（30），其控制来自位于检查区域（18）中的对象的辐射数据采集以进行检查。 重组处理器（40）将获取的数据周期性地分组到柱状图（42）中。 变换（70）将直方图（42）变换成单独的独立或不相关的分量，每个分量包括信号内容和噪声内容。 停止确定装置（52）将至少一个选定分量的方面与预定阈值（TH）进行比较，并且基于该比较终止数据采集。
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公开(公告)号：EP1815420A1
公开(公告)日：2007-08-08
申请号：EP05800605.7
申请日：2005-11-04
发明人： GAGNON, Daniel , WANG, Wenli
IPC分类号： G06T3/00
CPC分类号： G06T3/4061 , A61B6/583
摘要： A multi-modality system (10) includes a nuclear imaging system (12) and a computed tomography (CT) scanner (14). The nuclear system (12) includes a PET scanner (28) which acquires electronic data that is reconstructed into a PET blob image by a PET reconstruction processor (50). The CT scanner (14) acquires the scanned data which is reconstructed into a 3D CT voxel image by a CT reconstruction processor (56). An interpolation processor (62) interpolates the PET blob image directly into the CT voxel space. Once the PET and CT images are in the same space, they are combined by a combining means (110). A video processor (66) processes the received composite PET-CT data for a display on a monitor (68).
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公开(公告)号：EP1709463A1
公开(公告)日：2006-10-11
申请号：EP05702588.4
申请日：2005-01-05
IPC分类号： G01T1/29
CPC分类号： G01T1/2985 , A61B6/037 , G01T1/1615
摘要： A radiographic imaging system (10) includes an array of detectors (16) for detecting emission radiation emitted from a subject (14). The detectors (16) are arranged around a circular bore (18), defining a field of view of the imaging system (10). End shields (40) are disposed at an entrance and at an exit of the axial field-of-view (18) defining a subject receiving aperture (46). One or more septa (50), partially covering the circumference, shields the detectors (16) from the radiation originating outside of the axial field-of-view (18) as well as the body scattered radiation. Septa (50) are spread out sparsely across the field of view such that a ratio of the area shielded by the septa (50) to the field of view is negligible. The patient aperture (46) is increased without compromising the 3D imaging.
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公开(公告)号：EP1527405A2
公开(公告)日：2005-05-04
申请号：EP03716646.9
申请日：2003-03-17
发明人： GAGNON, Daniel , MCNALLY, James, M. , STECKNER, Michael, C. , STOLK, Jacob, A. , YOUNG, Terence, P.
IPC分类号： G06F19/00
CPC分类号： G16H15/00 , G06F19/00 , G06F19/321 , G06F19/3418 , G16H40/20
摘要： A plurality of diagnostic scanners (S1, S2, . . . , Sn) share access to a remote, communal processing center (CP) that performs reconstruction and post reconstruction processing for various modalities. Each of the diagnostic scanners submits a data set to the remote center electronically over the lines (T). An scheduling computer (22) assigns a priority to each of the received data sets and controls a plurality of parallel processors (261, 262, . . . , 26n) accordingly. The reconstructed image representations are sent electronically back to the address that sent them, or another designated location, for display on a monitor (281, 282, . . . , 28n, 28cf, 28r). Upgrades loaded into the remote center are immediately available for all users. Software modifications, hardware adjustments, training services, operations monitoring, and scanner operating services of individual scanners are provided from the remote center.
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公开(公告)号：EP1402286A2
公开(公告)日：2004-03-31
申请号：EP02752166.5
申请日：2002-06-20
IPC分类号： G01T1/29
CPC分类号： G01T1/2928 , A61B6/037 , A61B6/4258
摘要： A nuclear imaging apparatus includes a radiation detector comprising an array (18) of solid state detector elements (22) responsive to incident gamma radiation by emitting a current spike. A pixel correction processor (44) detects defective detector elements in the array and a flood correction circuit (66) corrects detected radiation events (70) based on sensitivity differences between a plurality of groupings of detector elements in the array. A reconstruction processor (76) reconstructs an image representation from the corrected radiation events (74).
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