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1. 发明授权

US06552349B2 Detector with non-circular field of view 失效
公开(公告)号：US06552349B2
公开(公告)日：2003-04-22
申请号：US10041198
申请日：2002-01-08
申请人： Daniel Gagnon , Christopher G. Matthews
发明人： Daniel Gagnon , Christopher G. Matthews
IPC分类号： G01T120
CPC分类号： G01T1/1648
摘要： A radiation detector includes a slit collimator. A radiation detector receives radiation which has been received in each of the slits. The aspect ratio of the detector is approximately three, and each semiconductor radiation detector has a transverse dimension which is less than that of its respective slit. A reconstruction processor generates an image indicative of the radiation received by the detectors. The detector may be rotated about a fixed axis. Alternately, the detector may be translated in coordination with its rotation to provide a substantially square field of view.

2. 发明授权

US6147353A Image shift for gamma camera 失效
标题翻译：伽马相机的图像移位
公开(公告)号：US6147353A
公开(公告)日：2000-11-14
申请号：US86947
申请日：1998-05-29
申请人： Daniel Gagnon , Christopher G. Matthews , Frank P. DiFilippo
发明人： Daniel Gagnon , Christopher G. Matthews , Frank P. DiFilippo
IPC分类号： G01T1/164 , G01T1/166
CPC分类号： G01T1/1648 , G01T1/166
摘要： A gamma camera includes first and second detectors which face an examination region. The detectors are rotatable about the examination region and translatable in a direction tangential to the examination region. Translation of the detectors is coordinated with the rotation of the detectors about the examination so as to increase the effective field of view of the detectors. In a first embodiment, the detectors are translated in the transverse direction when the detectors are located at each of a plurality of positions about the examination region. In a second embodiment, translation of the detectors is coordinated such that, for a given projection angle, the first detector is used to detect radiation data from a subset of the region of interest.
摘要翻译：伽马照相机包括面向检查区域的第一和第二检测器。检测器可围绕检查区域旋转并且可在与检查区域相切的方向上平移。检测器的翻转与检测器围绕检查的旋转协调，以增加检测器的有效视场。在第一实施例中，当检测器位于围绕检查区域的多个位置中的每一个位置时，检测器在横向平移。在第二实施例中，协调检测器的平移，使得对于给定的投影角度，第一检测器用于检测来自感兴趣区域的子集的辐射数据。

3. 发明授权

US06727502B1 Calibration technique for coincidence imaging systems 有权
标题翻译：符合成像系统的校准技术
公开(公告)号：US06727502B1
公开(公告)日：2004-04-27
申请号：US09893934
申请日：2001-06-27
申请人： Christopher G. Matthews , Wenli Wang
发明人： Christopher G. Matthews , Wenli Wang
IPC分类号： G01T1164
CPC分类号： G01T1/1644 , A61B6/037
摘要： An imaging method using a plurality of radiation detectors (12) is disclosed. A plurality of coincidence radiation events are measured (60) associated with a point radiation source (18). Initial values are assigned (62) for fitting parameters. Lines of response (LOR) are calculated (64) based upon the fitting parameters and the measured radiation events. A figure of merit is generated (66) that characterizes the apparent size of the point radiation source based upon the LOR's. The fitting parameters are optimized (70) using a minimization algorithm which includes iteratively repeating the calculating (64) and generating (66) steps to produce a minimized figure of merit. Correction factors are extracted from the optimized fitting parameters (72). A set of radiation data is acquired from an associated subject. The radiation data is corrected for mechanical camera misalignment by correcting the spatial coordinates of the detected radiation events using the correction factors. An image representation is reconstructed from the corrected radiation data.
摘要翻译：公开了一种使用多个辐射检测器（12）的成像方法。测量与点辐射源（18）相关联的多个重合辐射事件（60）。分配初始值（62）用于拟合参数。基于拟合参数和测量的辐射事件计算响应线（LOR）（64）。产生品质因数（66），其基于LOR来表征点辐射源的表观尺寸。使用最小化算法优化拟合参数（70）（70），其包括迭代地重复计算（64）和生成（66）步骤以产生最小化品质因数。从优化的拟合参数（72）中提取校正因子。从相关对象获取一组辐射数据。通过使用校正因子校正检测到的辐射事件的空间坐标，对机械相机未对准来校正辐射数据。从校正的辐射数据重建图像表示。

4. 发明授权

US06294788B1 Randoms correction in positron imaging 有权
标题翻译：正电子成像随机校正
公开(公告)号：US06294788B1
公开(公告)日：2001-09-25
申请号：US09377009
申请日：1999-08-18
申请人： Steven E. Cooke , Christopher G. Matthews , John F. Vesel
发明人： Steven E. Cooke , Christopher G. Matthews , John F. Vesel
IPC分类号： G01T1172
CPC分类号： G01T1/2985 , A61B6/037 , G01T1/172
摘要： In positron emission imaging, coincident gamma ray pairs are acquired and processed to generate an image. Random gamma ray pairs in the acquired coincidence data degrade the quality of the resultant image. The coincident gamma ray pairs are re-paired to generate non-coincident gamma ray pairs. The non-coincident pairs are used to correct for randoms in the acquired coincidence data. Alternately, singles gamma rays may be detected and paired with non-coincident single gamma rays to generate non-coincident pairs. These pairs may be used to correct for randoms in the acquired coincidence data.
摘要翻译：在正电子发射成像中，获取并处理重合的伽马射线对以产生图像。所获得的符合数据中的随机伽马射线对降低所得图像的质量。重合伽马射线对被重新配对以产生非重合伽马射线对。不一致的对用于校正所获取的重合数据中的随机数。或者，单个γ射线可以被检测并且与非重合的单个γ射线配对以产生非重合对。这些对可用于校正所获取的重合数据中的随机数。

5. 发明授权

US06359279B1 Detector for nuclear imaging 失效
标题翻译：核成像检测器
公开(公告)号：US06359279B1
公开(公告)日：2002-03-19
申请号：US09206508
申请日：1998-12-07
申请人： Daniel Gagnon , Christopher G. Matthews
发明人： Daniel Gagnon , Christopher G. Matthews
IPC分类号： F01T1166
CPC分类号： G01T1/1648
摘要： A radiation detector includes slit collimator. A radiation detector receives radiation which has been received in each of the slits. The aspect ratio of the detector is approximately three, and each semiconductor radiation detector has a transverse dimension which is less than that of its respective slit. A reconstruction processor generates an image indicative of the radiation received by the detectors. The detector may be rotated about a fixed axis. Alternately, the detector may be translated in coordination with its rotation to provide a substantially square field of view.
摘要翻译：辐射检测器包括狭缝准直仪。辐射检测器接收已经接收在每个狭缝中的辐射。检测器的纵横比约为三个，每个半导体辐射检测器的横向尺寸小于其相应狭缝的横向尺寸。重建处理器产生指示由检测器接收的辐射的图像。检测器可以围绕固定轴线旋转。或者，检测器可以与其旋转协调地平移以提供基本上正方形的视场。

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