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51. 发明授权

US07375337B2 Constant radius single photon emission tomography 失效
标题翻译：恒半径单光子发射断层扫描
公开(公告)号：US07375337B2
公开(公告)日：2008-05-20
申请号：US10541559
申请日：2003-12-19
申请人： Daniel Gagnon
发明人： Daniel Gagnon
IPC分类号： G01T1/164 , G01T1/166
CPC分类号： A61B6/037 , A61B6/032 , A61B6/5235 , G01T1/1603 , G01T1/1611 , G01T1/1644 , G01T1/1648 , G01T1/2985
摘要： A nuclear camera (10) includes four or more gamma detectors (20, 20′, 20″, 201, 202, 203, 204, 205, 206) arranged or, a generally circular rotatable gantry (12, 12′, 12″, 12′″) around an imaging region that emits emission radiation. The gamma detectors are each disposed at a fixed equal distance (R, R2, R3, R5) from an imaging isocenter (22, 22′, 22″, 22′″) to rotate in a fixed radius circular orbit. Each gamma detector includes a radiation sensitive surface (72) that responds to the emission radiation and a slat collimator (70) that spins about an axis 88. Resolution and sensitivity at the fixed radius are selected by selecting collimator slat height (Wz) and spacing (G) and radiation sensitive surface width (Cy). The gamma detectors and rotating gantry are enclosed in an optically opaque toroidal housing (14) that defines a generally circular bore (16) that admits imaging subjects over a range of sizes.
摘要翻译：核相机（10）包括布置的四个或更多个伽马检测器（20,20'，20“，201,202,203,204,205,206），或者大致圆形的可旋转机架（12,12'，12' '，12“'）围绕发射发射辐射的成像区域。伽马检测器各自从成像等角点（22,22'，22“，22”“）以固定的等距离（R，R 2，R 3，R 5）设置成以固定半径的圆形轨道旋转。每个伽马检测器包括响应于发射辐射的辐射敏感表面（72）和围绕轴线88旋转的平板准直器（70）。通过选择准直器板条高度（Wz）和间距来选择固定半径处的分辨率和灵敏度（G）和辐射敏感表面宽度（Cy）。伽马探测器和旋转机架被封闭在光学不透明的环形壳体（14）中，该环形壳体限定大致圆形的孔（16），其允许成像对象在一定尺寸范围内。

52. 发明申请

US20070102873A1 Apparatus for varying pressure roll nip force 审中-公开
标题翻译：用于改变压力辊压力的装置
公开(公告)号：US20070102873A1
公开(公告)日：2007-05-10
申请号：US11269313
申请日：2005-11-08
申请人： Larry Acton , William Connors , Daniel Gagnon , Herman Smith
发明人： Larry Acton , William Connors , Daniel Gagnon , Herman Smith
IPC分类号： B65H5/02 , B65H5/04
CPC分类号： B65H5/062 , B65H2511/224
摘要： An apparatus for varying nip pressure in a media feedpath including a feed roller and a pressure roller defining a feed nip there between includes a rotatable cam having a preselected eccentric path when rotated, a first pivotable linkage pivotally engaging the rotatable cam, a second pivotable linkage, a biasing member operably interconnecting the first and second pivotal linkages for providing a biasing force on the pressure roller. The pressure roller is rotatably connected to the second linkage opposite the biasing member, wherein rotation of the cam varies the biasing force provided by the biasing member on the pressure roller.
摘要翻译：用于改变介质进给路径中包括进给辊和限定其间的进给辊隙的压力辊的压力压力的装置包括：当旋转时具有预选偏心路径的可旋转凸轮;枢转地接合可旋转凸轮的第一可枢转连杆;第二可枢转连杆，偏置构件，其可操作地互连所述第一和第二枢转连杆，以在所述压力辊上提供偏置力。压力辊可旋转地连接到与偏置构件相对的第二连杆，其中凸轮的旋转改变由偏压构件在压力辊上提供的偏压力。

53. 发明申请

US20060289776A1 Method and apparatus for reversing performance degradation in semi-conductor detectors 有权
标题翻译：用于逆转半导体检测器性能下降的方法和装置
公开(公告)号：US20060289776A1
公开(公告)日：2006-12-28
申请号：US10595433
申请日：2004-10-06
申请人： Daniel Gagnon , Jerome Griesmer
发明人： Daniel Gagnon , Jerome Griesmer
IPC分类号： G01T1/24
CPC分类号： G01T1/249 , G01T1/24
摘要： A system reverses degraded energy resolution of semiconductor radiation detection elements (44) which are used in a radiation detector assembly. A means (38) identifies semiconductor elements which exhibit degraded energy resolution as compared to an initial level of energy resolution after application of the forward bias. A means (40) restores the degraded semiconductor elements to the initial level of energy resolution by applying the reverse bias. A heater (74) accelerates the restoration process by supplying an elevated ambient temperature. A screening means (48) screens new semiconductor elements to identify the elements which are susceptible to degradation. A forward bias is applied by a forward bias means (50) to induce the degradation. A heater (52) increases an ambient temperature to accelerate the performance degradation in the new semiconductor elements. The identified degradable elements are treated with a reverse bias prior to installation in the detector.
摘要翻译：系统反转在辐射检测器组件中使用的半导体辐射检测元件（44）的降解的能量分辨率。一种装置（38）识别与应用正向偏压之后的能量分辨率的初始水平相比表现出降低的能量分辨率的半导体元件。 A装置（40）通过施加反向偏压将劣化的半导体元件恢复到初始的能量分辨率水平。加热器（74）通过提供升高的环境温度来加速恢复过程。屏蔽装置（48）屏蔽新的半导体元件以识别易于退化的元件。正向偏压由正向偏压装置（50）施加以引起劣化。加热器（52）增加环境温度以加速新半导体元件的性能下降。在安装在检测器中之前，用反向偏压处理所识别的可降解元件。

54. 发明授权

US06627893B1 Focused rotating slat-hole for gamma cameras 失效
标题翻译：用于伽马相机的聚焦旋转板条孔
公开(公告)号：US06627893B1
公开(公告)日：2003-09-30
申请号：US09808935
申请日：2001-03-15
申请人： Gengsheng Lawrence Zeng , Daniel Gagnon
发明人： Gengsheng Lawrence Zeng , Daniel Gagnon
IPC分类号： G01T1166
CPC分类号： G01T1/1648 , A61B6/037 , G01T1/1644
摘要： &ggr;-ray emissions (14) are detected by a rotating, one-dimensional detector array (18). Slats of a convergent or divergent collimator (16) are mounted between detector elements. The slats are canted by an angle &agr; from focusing on a focal spot (40) on a perpendicular bisector to the detector array. As a detector head (30) revolves around a longitudinal axis (36) of the subject, the head is canted (FIG. 5) to generate angularly offset data sets. Data sets with the detector array rotated to 180° opposite orientations are processed (62) to generate a first derivative data set. Parallel lines or planes (64) of the canted data sets are processed (68) to generate a second derivative data set which is backprojected (70) in accordance with the Radon transform into a three-dimensional image representation.
摘要翻译：伽马射线辐射（14）由旋转的一维检测器阵列（18）检测。收敛或发散准直器（16）的板条安装在检测器元件之间。板条以聚焦在垂直平分线上的焦点（40）上的角度α倾斜到检测器阵列。当检测器头（30）围绕对象的纵向轴线（36）旋转时，头部被倾斜（图5）以产生角度偏移数据集。将检测器阵列旋转到相对方向180°的数据集被处理（62）以产生一阶导数数据集。处理倾斜数据集合的平行线或平面（64）（68）以产生根据Radon变换反向投影（70）到三维图像表示中的二阶导数数据集。

55. 发明授权

US06388257B1 Stepped asymmetric sampling scheme for transmission radiation corrected gamma cameras 失效
标题翻译：用于传输辐射校正的伽马照相机的步进非对称采样方案
公开(公告)号：US06388257B1
公开(公告)日：2002-05-14
申请号：US09522736
申请日：2000-03-10
申请人： Daniel Gagnon , Chi-Hua Tung
发明人： Daniel Gagnon , Chi-Hua Tung
IPC分类号： G01T1166
CPC分类号： G01T1/1615 , G01T1/1648
摘要： An asymmetric sampling scheme for use with a nuclear medicine gamma camera facilitates collection of a full set of higher resolution emission data and lower resolution transmission data with one complete 360° rotation of the gantry. The gantry (16) contains a plurality of radiation detectors (20a-20c) and at least one adjustably mounted radiation source (30a). During a scan, the gantry (16) is incrementally rotated about a subject receiving aperture (18) by a predetermined step size throughout a first 180° of a rotation (P1, . . . , P6). The gantry (16) is then rotated about the subject receiving aperture (18) by one-half the predetermined step size (P7 or P8). The gantry (16) is then incrementally rotated about the subject receiving aperture (18) by the predetermined step size throughout the remaining 180° of the scan (P8, . . . , P2). Emission data collected during the second half of the scan (P8, . . . , P12) is interleaved into the data from the first half of the scan. Such sampling reduces overall scan time by cutting the number of steps approximately in half, therefore, eliminating 50% of the dead time while the gantry rotates and comes to rest.
摘要翻译：与核医学伽马照相机一起使用的非对称采样方案有助于采集一整套更高分辨率的发射数据和较低分辨率的传输数据，同时具有台架的一个完整360°旋转。台架（16）包含多个辐射探测器（20a-20c）和至少一个可调节安装的辐射源（30a）。在扫描期间，在旋转的第一个180°（P1，...，P6）中，台架（16）围绕被检体接收孔径（18）以预定的步长递增地旋转。然后将台架（16）围绕主体接收孔（18）旋转预定步长（P7或P8）的一半。然后，在整个扫描的剩余180°（P8，...，P2）中，台架（16）围绕被检体接收孔（18）逐渐旋转预定的步长。扫描后半部分收集的发射数据（P8，...，P12）被交织到扫描前半部分的数据中。这种采样通过将大约一半的步数减少来减少总体扫描时间，因此，当台架旋转并停止时，消除50％的死区时间。

56. 发明授权

US06388244B1 Virtual contouring for transmission scanning in spect and pet studies 失效
标题翻译：在光谱和宠物研究中的虚拟轮廓传输扫描
公开(公告)号：US06388244B1
公开(公告)日：2002-05-14
申请号：US09531840
申请日：2000-03-20
申请人： Daniel Gagnon
发明人： Daniel Gagnon
IPC分类号： H01L2700
CPC分类号： G01T1/1615 , A61B6/037 , A61B6/4258 , G01T1/1648 , G01T1/2985
摘要： A nuclear gamma camera employs a virtual contouring technique in order to maximize the portion of transmission radiation fan beams (32a, 32b) which pass through a subject (12). A plurality of radiation detector heads (20a-20c) having radiation receiving faces and a plurality of radiation sources (30a, 30b) are mounted to a gantry (16). An orbit memory (42) stores clearance offset orbit (45) around the subject and a subject support (10). A tangent calculator (46) calculates virtual lines (48a, 48b) between the radiation sources (30a, 30b) and the corresponding radiation detector heads (20a, 20b). The virtual lines (48a, 48b) correspond to edge rays of the transmission radiation fans (32a, 32b). A shift calculator (50) calculates and sends shift commands to a motor orbit controller (52) which controls rotational and translational drives attached to the detector heads (20a-20c). The detector heads are translated such that the virtual lines (48a, 48b) remain tangent to a predefined contour of the subject throughout rotation of the detector heads about the subject receiving aperture (18). The detected transmission radiation (32a, 32b) is reconstructed (64t) into an attenuation volumetric image representation and used to correct (68) detected emission radiation data. The corrected emission data is then reconstructed (64e) into a volumetric image representation. The virtual contouring minimizes lost rays (40) of transmission radiation and facilitates an artifact-free attenuation volumetric image representation.
摘要翻译：核伽马照相机采用虚拟轮廓技术，以使通过被摄体（12）的透射辐射扇形光束（32a，32b）的部分最大化。具有辐射接收面和多个辐射源（30a，30b）的多个辐射探测器头（20a-20c）安装在台架（16）上。轨道存储器（42）存储围绕被摄体和对象支架（10）的间隙偏移轨道（45）。切线计算器（46）计算辐射源（30a，30b）和相应的辐射探测器头（20a，20b）之间的虚线（48a，48b）。虚拟线（48a，48b）对应于透射辐射风扇（32a，32b）的边缘光线。移位计算器（50）计算并发送移位命令到马达轨道控制器（52），该马达轨道控制器控制附接到检测器头（20a-20c）的旋转和平移驱动。检测器头被平移，使得虚拟线（48a，48b）在检测器头围绕对象接收孔（18）的旋转期间保持与被摄体的预定轮廓相切。检测到的发射辐射（32a，32b）被重建（64t）成为衰减体积图像表示，并用于校正（68）检测到的发射辐射数据。然后将经校正的发射数据重建（64e）成体积图像表示。虚拟轮廓使传输辐射的损失光线（40）最小化，并且有利于无伪影衰减

57. 发明授权

US10114086B2 Hybrid PET/MR imaging systems 有权
公开(公告)号：US10114086B2
公开(公告)日：2018-10-30
申请号：US12195637
申请日：2008-08-21
申请人： Daniel Gagnon , Michael A. Morich , Douglas M. Blakeley , Robert L. Zahn , Kevin M. Nieman
发明人： Daniel Gagnon , Michael A. Morich , Douglas M. Blakeley , Robert L. Zahn , Kevin M. Nieman
IPC分类号： A61B5/05 , A61B6/00 , G01R33/28 , G01R33/3875 , G01R33/421 , G01R33/422 , G01R33/48
摘要： A hybrid imaging system includes a magnetic resonance scanner and a second modality imaging system disposed in the same radio frequency isolation space. The second modality imaging system includes radiation detectors configured to detect at least one of high energy particles and high energy photons. In some embodiments a retractable radio frequency screen is selectively extendible into a gap between the magnetic resonance scanner and the second modality imaging system. In some embodiments shim coils are disposed with the magnetic resonance scanner and are configured to compensate for distortion of the static magnetic field of the magnetic resonance scanner produced by proximity of the second modality imaging system.

58. 发明授权

US09285326B2 Sparse and energy discriminating collimated detector elements to assist scatter evaluation in CT imaging 有权
标题翻译：稀疏和能量鉴别准直检测器元件，以辅助CT成像中的散射评估
公开(公告)号：US09285326B2
公开(公告)日：2016-03-15
申请号：US13526594
申请日：2012-06-19
申请人： Daniel Gagnon , Yu Zou , Xiaolan Wang
发明人： Daniel Gagnon , Yu Zou , Xiaolan Wang
IPC分类号： A61B6/00 , G01T1/16 , G01N23/04 , G01T1/24 , A61B6/03 , H05G1/02
CPC分类号： G01N23/046 , A61B6/032 , A61B6/4078 , A61B6/4233 , A61B6/4291 , A61B6/5282 , G01T1/242 , H05G1/02
摘要： A computed-tomography apparatus that includes a CT scanner including an X-ray source and a detector covering respective angle ranges in the axial and transaxial planes of the CT scanner. The CT detector includes first detector elements disposed on a first surface to capture incident X-ray photons emitted from the X-ray source, and second detector elements sparsely disposed on a second surface different from the first surface, the second surface being farther away from the scanner than the first surface, the second detector elements being smaller in number than the first detector elements. Each of the second detector elements is reachable only by X-ray photons originating in a small angle range around a line connecting the X-ray source and a center of the surface of the detector element, the small angle range being determined by the predetermined distance separating the first and second surfaces and a size of the detector element.
摘要翻译：一种计算机断层摄影装置，其包括CT扫描仪，其包括X射线源和覆盖CT扫描器的轴向和横轴平面中的相应角度范围的检测器。 CT检测器包括设置在第一表面上以捕获从X射线源发射的入射X射线光子的第一检测器元件，以及稀疏地设置在不同于第一表面的第二表面上的第二检测器元件，第二表面远离扫描器比第一表面，第二检测器元件的数量小于第一检测器元件。每个第二检测器元件只能由围绕连接X射线源和检测器元件的表面的中心的线的小角度范围内的X射线光子到达，小角度范围由预定距离确定分离第一和第二表面以及检测器元件的尺寸。

59. 发明授权

US08558181B2 Positron emission tomography system with hybrid detection geometries and sampling 有权
标题翻译：具有混合检测几何和采样的正电子发射断层摄影系统
公开(公告)号：US08558181B2
公开(公告)日：2013-10-15
申请号：US12915705
申请日：2010-10-29
申请人： Daniel Gagnon , Wenli Wang
发明人： Daniel Gagnon , Wenli Wang
IPC分类号： G01T1/164 , G21K1/02
CPC分类号： G01T1/1644 , A61B6/037
摘要： A gamma ray detection system includes a plurality of detector modules having a same length, where each detector module is configured to detect gamma rays generated from positron annihilation events. A first detector module of the plurality of detector modules is shifted by a predetermined distance in an axial direction from a second detector module of the plurality of detector modules that is adjacent to the first detector module, where the predetermined distance is less than the length of the detector modules.
摘要翻译：伽马射线检测系统包括具有相同长度的多个检测器模块，其中每个检测器模块被配置为检测由正电子湮灭事件产生的伽马射线。多个检测器模块的第一检测器模块从与第一检测器模块相邻的多个检测器模块的第二检测器模块沿轴向偏移预定距离，其中预定距离小于检测器模块。

60. 发明授权

US08515148B2 Geometrical transformations preserving list-mode format 有权
标题翻译：保留列表模式格式的几何变换
公开(公告)号：US08515148B2
公开(公告)日：2013-08-20
申请号：US12991719
申请日：2009-05-13
申请人： Daniel Gagnon , Patrick Olivier , Parmeshwar Kishore Khurd
发明人： Daniel Gagnon , Patrick Olivier , Parmeshwar Kishore Khurd
IPC分类号： G06K9/00
CPC分类号： G01T1/1648 , A61B6/037 , G06T11/005
摘要： A diagnostic imaging device includes detector elements (16) for detecting γ-rays indicative of nuclear decay events. The detected γ-rays are used to produce lines of response (LORs) (46), which are time stamped (20) and stored in list mode. The LORs are reconstructed (34) into an image. An image analysis processor (38) analyzes the image for motion artifacts and iteratively adjusts an event transform processor (30) to transform selected LORs to minimize the motion artifacts. If the transformed LOR (50) does not correspond with a pair of detector elements (16), closest detector elements (52, 54) are determined. Candidate LORs (62) are created between the closest and neighboring detector elements. An event location (40) on an LOR (46) is determined from the time-of-flight (TOF) information and then transformed (47) to generate a transformed event location (48). The candidate LOR (62) which most nearly intersects the transformed event location (40) and the appropriately updated TOF information is selected for use in image reconstruction.
摘要翻译：诊断成像装置包括用于检测指示核衰变事件的γ射线的检测器元件（16）。检测到的伽马射线用于产生响应列（LOR）（46），它们是时间戳的（20），并以列表模式存储。 LOR被重构（34）成为图像。图像分析处理器（38）分析运动伪像的图像，并迭代地调整事件变换处理器（30）以变换所选择的LOR以最小化运动伪影。如果变换的LOR（50）不对应于一对检测器元件（16），则确定最近的检测器元件（52,54）。在最近和相邻的检测器元件之间创建候选LOR（62）。根据飞行时间（TOF）信息确定LOR（46）上的事件位置（40），然后变换（47）以生成转换的事件位置（48）。选择与变换的事件位置（40）最接近相交的候选LOR（62）和适当更新的TOF信息用于图像重建。

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