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1. 发明授权

US5760401A Resolution enhancement apparatus and method for dual head gamma camera system capable of coincidence imaging 失效
标题翻译：用于能够重合成像的双头伽马相机系统的分辨率增强装置和方法
公开(公告)号：US5760401A
公开(公告)日：1998-06-02
申请号：US846525
申请日：1997-04-29
申请人： Peter Nelleman , Hugo Bertelsen , Horace Hines
发明人： Peter Nelleman , Hugo Bertelsen , Horace Hines
IPC分类号： G01T1/164 , G01T1/166 , G01T1/202 , G01T1/29 , G01T1/172
CPC分类号： G01T1/1603 , A61B6/037 , G01T1/1642 , G01T1/2985
摘要： The present invention provides an apparatus and method for enhancing the resolution of a Positron Emission Tomography (PET) image in a Nuclear Camera System that is configurable to performs both PET and SPECT imaging. The apparatus includes a crystal that interacts with a gamma ray to create a scintillation event within the surface of the crystal. The gamma rays that impinge the crystal have an incident angle that is limited by a field of view of the crystal. Positioned behind the crystal is a detector that responds to the light photons released by the scintillation event and registers a coordinate value of the scintillation event. Coupled to the detector is a resolution enhancer that generates an in-crystal plane displacement correction value for the coordinate value registered by the detector. The in-crystal plane displacement correction value is then combined with the coordinate value to compute the actual entry point of the gamma ray into the crystal.
摘要翻译：本发明提供了一种用于增强核相机系统中可配置为执行PET和SPECT成像的正电子发射断层摄影（PET）图像的分辨率的装置和方法。该装置包括与γ射线相互作用以在晶体表面内产生闪烁事件的晶体。撞击晶体的伽马射线具有受到晶体视场限制的入射角。位于晶体后面的是检测器，其响应于由闪烁事件释放的光子，并记录闪烁事件的坐标值。耦合到检测器的是分辨率增强器，其产生由检测器登记的坐标值的晶体内位移校正值。然后将晶体平面位移校正值与坐标值组合，以计算伽马射线进入晶体的实际入口点。

2. 发明授权

US6008493A Method and apparatus for performing correction of emission contamination and deadtime loss in a medical imaging system 失效
标题翻译：用于执行医疗成像系统中的排放污染和死时间损失校正的方法和装置
公开(公告)号：US6008493A
公开(公告)日：1999-12-28
申请号：US865930
申请日：1997-05-30
申请人： Lingxiong Shao , Hugo Bertelsen , Peter Nelleman , Horace Hines
发明人： Lingxiong Shao , Hugo Bertelsen , Peter Nelleman , Horace Hines
IPC分类号： G01T1/161 , G01T1/17 , G01T1/29 , G01T1/166
CPC分类号： G01T1/1611 , G01T1/171 , G01T1/2985
摘要： A method of correcting for deadtime and for emission contamination of a transmission scan in a nuclear camera system is provided. The transmission scan is used to correct positron emission tomography (PET) images for attenuation. The camera system includes two detectors and two corresponding single-photon point sources that are collimated to produce fanbeam illumination profiles. A transmission detection window and an emission contamination detection window is defined on each detector. Radiation from each source is scanned axially across the field of view of the corresponding detector in synchronization with the corresponding transmission detection window to acquire transmission projection data. The emission contamination detection windows are also scanned axially concurrently with, but offset from, the transmission detection windows to acquire emission data. Events detected in the transmission detection windows are used to add counts from appropriate locations of the transmission projection on an event-by-event basis as those events are detected. Events detected in the emission contamination detection windows are used to subtract counts from appropriate locations of the transmission projection on an event-by-event basis as those events are detected. The number of counts by which a given location is incremented or decremented for each detected event is determined event-by-event from a look-up table based on the current singles rate.
摘要翻译：提供了一种校正核相机系统中的发射扫描的死区时间和发射污染的方法。透射扫描用于校正正电子发射断层摄影（PET）图像以进行衰减。相机系统包括两个检测器和两个对准的单光子点源，其被准直以产生扇形照明轮廓。在每个检测器上定义传输检测窗口和排放污染检测窗口。与对应的传输检测窗口同步地从相应检测器的视野轴向扫描来自每个源的辐射以获取传输投影数据。排放污染检测窗口也与传输检测窗口轴向同时扫描但偏移以获取发射数据。在发送检测窗口中检测到的事件用于在检测到事件时逐个事件的基础上从传输投影的适当位置添加计数。在发射污染检测窗口中检测到的事件用于在检测到事件时逐个事件基础上从传输投影的适当位置减去计数。基于当前单打率，从查找表中逐个事件确定给定位置对于每个检测到的事件递增或递减的计数次数。

3. 发明授权

US06410920B1 Method and apparatus for performing correction of emission contamination and deadtime loss in a medical imaging system 失效
标题翻译：用于执行医疗成像系统中的排放污染和死时间损失校正的方法和装置
公开(公告)号：US06410920B1
公开(公告)日：2002-06-25
申请号：US09400745
申请日：1999-09-21
申请人： Lingxiong Shao , Hugo Bertelsen , Peter Nelleman , Horace Hines
发明人： Lingxiong Shao , Hugo Bertelsen , Peter Nelleman , Horace Hines
IPC分类号： G01T1164
CPC分类号： G01T1/2985 , A61B6/00 , A61B6/037 , G01T1/1611 , G01T1/171
摘要： A method of correcting for deadtime and for emission contamination of a transmission scan in a nuclear camera system is provided. The transmission scan is used to correct positron emission tomography (PET) images for attenuation. The camera system includes two detectors and two corresponding single-photon point sources that are collimated to produce fanbeam illumination profiles. A transmission detection window and an emission contamination detection window is defined on each detector. Radiation from each source is scanned axially across the field of view of the corresponding detector in synchronization with the corresponding transmission detection window to acquire transmission projection data. The emission contamination detection windows are also scanned axially concurrently with, but offset from, the transmission detection windows to acquire emission data. Events detected in the transmission detection windows are used to add counts from appropriate locations of the transmission projection on an event-by-event basis in real-time. Events detected in the emission contamination detection windows are used to subtract counts from appropriate locations of the transmission projection on an event-by-event basis as those events are detected. The number of counts by which a given location is incremented or decremented for each detected event is determined event-by-event from a look-up table based on the current singles rate.
摘要翻译：提供了一种校正核相机系统中的发射扫描的死区时间和发射污染的方法。透射扫描用于校正正电子发射断层摄影（PET）图像以进行衰减。相机系统包括两个检测器和两个对准的单光子点源，其被准直以产生扇形照明轮廓。在每个检测器上定义传输检测窗口和排放污染检测窗口。与对应的传输检测窗口同步地从相应检测器的视野轴向扫描来自每个源的辐射以获取传输投影数据。排放污染检测窗口也与传输检测窗口轴向同时扫描但偏移以获取发射数据。在传输检测窗口中检测到的事件用于实时地逐个事件地从传输投影的适当位置添加计数。在发射污染检测窗口中检测到的事件用于在检测到事件时逐个事件基础上从传输投影的适当位置减去计数。基于当前单打率，从查找表中逐个事件确定给定位置对于每个检测到的事件递增或递减的计数次数。

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