专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US6144034A Delay calibration for gamma camera timing circuit 失效
标题翻译：伽马相机定时电路的延迟校准
公开(公告)号：US6144034A
公开(公告)日：2000-11-07
申请号：US120993
申请日：1998-07-22
申请人： Thomas E. Scharf , Michael J. Petrillo
发明人： Thomas E. Scharf , Michael J. Petrillo
IPC分类号： G01T1/164 , H03K5/00 , G01T1/166 , H03K5/22
CPC分类号： G01T1/1647 , H03K2005/00097
摘要： A method and apparatus for calibrating a programmable delay in a timing circuit of a gamma camera detector are provided. The programmable delay has an error, the value of which is to be determined. An input signal that is applied as input to the programmable delay is simultaneously applied as input to a precision fixed delay. The fixed delay has a delay value within the programmable range of the programmable delay, but has an error that is substantially smaller than that of the programmable delay. The output of the programmable delay is applied to one input of a decision circuit, and the output of the fixed delay is applied to another input of the decision circuit. The delay of the programmable delay is initially programmed to a value that is substantially greater than the delay of the fixed delay, and input pulses are then applied to both delays. The delay value of the programmable delay is progressively decreased as input pulses are applied, until the output of the decision circuit indicates that the outputs of both delays are asserted concurrently. The error of the programmable delay is then computed based upon the programmed delay value. The programmable delay is then reprogrammed with a new delay value, based on the computed error, to achieve a desired delay value during normal operation of the timing circuit.
摘要翻译：提供了用于校准伽马相机检测器的定时电路中的可编程延迟的方法和装置。可编程延迟有一个错误，其值将被确定。作为可编程延迟的输入的输入信号同时作为精度固定延迟的输入。固定延迟在可编程延迟的可编程范围内具有延迟值，但是具有明显小于可编程延迟的误差。可编程延迟的输出被施加到判定电路的一个输入，并且固定延迟的输出被施加到判决电路的另一个输入端。可编程延迟的延迟最初被编程为大大大于固定延迟的延迟的值，然后将输入脉冲施加到两个延迟。当施加输入脉冲时，可编程延迟的延迟值逐渐减小，直到判决电路的输出指示两个延迟的输出同时被断言。然后根据编程的延迟值计算可编程延迟的误差。然后，基于计算出的误差，可编程延迟用新的延迟值进行重新编程，以在定时电路的正常操作期间实现期望的延迟值。

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

US5959300A Attenuation correction in a medical imaging system using computed path lengths and attenuation values of a model attenuation medium 失效
标题翻译：使用计算的路径长度和模型衰减介质的衰减值在医学成像系统中的衰减校正
公开(公告)号：US5959300A
公开(公告)日：1999-09-28
申请号：US833684
申请日：1997-04-08
申请人： Horace H. Hines , William K. Braymer , John R. Liebig
发明人： Horace H. Hines , William K. Braymer , John R. Liebig
IPC分类号： G01T1/164 , G01T1/29 , G01T1/166
CPC分类号： G01T1/1611 , A61B6/037 , G01T1/1642 , G01T1/2985
摘要： A method of correcting for attenuation during emission imaging in a gamma camera medical imaging system. Attenuation values are determined empirically and are stored in a look-up table in a memory that is readable by the imaging system, with each attenuation value corresponding to a given thickness value. The attenuation values are computed before imaging is performed by first measuring the number of photons which pass from a transmission source through various known depths of water or another suitable model attenuator, using the same radiation source as will be used for emission imaging. For each depth, the measurement is then used to compute the actual attenuation for a thickness of the model attenuator. The attenuation is then stored as a value in the look-up table with corresponding values of attenuator thickness and is later used to correct emission data for the effects of attenuation.
摘要翻译：一种在γ照相机医学成像系统中校正发射成像期间的衰减的方法。经验确定衰减值，并存储在可由成像系统读取的存储器中的查找表中，每个衰减值对应于给定的厚度值。在通过首先使用与用于发射成像的相同的辐射源测量从透射源通过各种已知深度的水或另一合适的模型衰减器的光子的数量来执行成像之前计算衰减值。对于每个深度，然后使用测量来计算模型衰减器的厚度的实际衰减。然后将衰减作为值与衰减器厚度的对应值一起存储在查找表中，并且随后用于校正发射数据的衰减效应。

4. 发明授权

US5763887A Tailored optical interface for scintillation camera detector 失效
标题翻译：用于闪烁相机检测器的定制光学接口
公开(公告)号：US5763887A
公开(公告)日：1998-06-09
申请号：US691585
申请日：1996-08-02
申请人： Matthew J. Murphy
发明人： Matthew J. Murphy
IPC分类号： G01T1/164 , G01T1/20
CPC分类号： G01T1/1642 , G01T1/2002 , A61B6/4258
摘要： A scintillation camera detector head comprises a scintillation crystal, a plurality of photomultiplier tubes (PMTs) optically coupled to the scintillation crystal, and a diffractive surface, such as a holographic optical element (HOE), optically coupled to the scintillation crystal. The diffractive surface preferentially reflects or redirects light from a scintillation event which impinges upon the surface toward one or more predetermined PMTs as a function of the angle of incidence or the location of the event. Light emitted under a peak PMT can be preferentially reflected or transmitted away from the peak PMT and toward the surrounding PMTs to reduce spatial resolution modulation. Alternatively, light impinging on the surface from an event can be directed toward the peak PMT and away from surrounding PMTs to achieve greater isolation of events.
摘要翻译：闪烁照相机检测器头包括闪烁晶体，与闪烁晶体光学耦合的多个光电倍增管（PMT）和光学耦合到闪烁晶体的衍射表面，例如全息光学元件（HOE）。衍射表面优选地将来自闪烁事件的光反射或重定向，作为入射角或事件位置的函数的一个或多个预定PMT的冲击表面。在峰值PMT下发射的光可以优先反射或远离峰值PMT并朝着周围的PMT发射以减少空间分辨率调制。或者，从事件撞击在表面上的光可以被引导到峰值PMT并远离周围的PMT以实现更大的事件隔离。

5. 发明授权

US5629971A Scan speed for transmission exposure reduction in a nuclear medicine camera 失效
标题翻译：用于核医学相机的传输曝光减少的扫描速度
公开(公告)号：US5629971A
公开(公告)日：1997-05-13
申请号：US439111
申请日：1995-05-11
申请人： Steven M. Jones , Michael J. Janicki , Thomas F. Lang , John R. Liebig , Xiaohan Wang
发明人： Steven M. Jones , Michael J. Janicki , Thomas F. Lang , John R. Liebig , Xiaohan Wang
IPC分类号： G01T1/164 , G21K5/10
CPC分类号： G01T1/1615 , A61B6/037 , G01T1/1611 , G01T1/1642
摘要： A scan speed procedure and method wherein a minimum radiation exposure period is determined on an object by object basis for a transmission study. Two transmission scans are performed including a prescan followed by a second transmission scan phase. The first transmission prescan is performed using a radiation source over the object. This prescan is of a rapid and predetermined duration (Tp). A resultant count density associated with the object is then generated and examined. The portion having the smallest count density (Cm) is determined and a value (Co) representing the minimum required number of counts for transmission study is given. From the above, a transmission period (Ts) is determined by the system and the second transmission scan phase is performed for the duration Ts using a multi-pass scan phase. The computed duration Ts represents the minimum exposure duration required to collect transmission data to ensure that the count density distribution associated with the object will contain at least Cm count density over each portion of the object.
摘要翻译：一种扫描速度程序和方法，其中针对传输研究，逐对象地确定最小辐射暴露周期。执行两次传输扫描，包括预扫描，随后是第二传输扫描阶段。使用物体上的辐射源执行第一传输预扫描。该预扫描具有快速和预定的持续时间（Tp）。然后生成并检查与对象相关联的合成计数密度。确定具有最小计数密度（Cm）的部分，并且给出表示用于传输研究的最小所需计数数量的值（Co）。从上述可以看出，系统确定了传输周期（Ts），并且使用多遍扫描阶段对持续时间Ts执行第二传输扫描阶段。所计算的持续时间Ts表示收集传输数据所需的最小曝光持续时间，以确保与对象相关联的计数密度分布在对象的每个部分上至少包含Cm计数密度。

6. 发明授权

US5598003A Large field of view transmission and small field of view emission scan within gamma camera system 失效
标题翻译：伽马相机系统中的大视野传输和小视野发射扫描
公开(公告)号：US5598003A
公开(公告)日：1997-01-28
申请号：US438834
申请日：1995-05-11
申请人： Steven M. Jones , Michael J. Janicki , Thomas F. Lang , J. Keenan Brown , John R. Liebig , Xiaohan Wang
发明人： Steven M. Jones , Michael J. Janicki , Thomas F. Lang , J. Keenan Brown , John R. Liebig , Xiaohan Wang
IPC分类号： G01T1/164 , G01T1/161
CPC分类号： G01T1/1648 , A61B6/037 , G01T1/1642
摘要： A method and apparatus for collecting transmission information utilizing a large field of view of a detector and for collecting emission data using a small field of view window of the same detector. The system employs the large field of view of a scintillation detector in order to collect transmission data for the entire body being scanned. Such a technique improves the quantitative capability of emission data by acquiring non-truncated attenuation factors. The emission data of a small field of view window is collected so that high resolution image pixels are used for processing the emission data (e.g., of a particular body organ). Since a large field of view is used for collecting the transmission data, the imaging pixels for transmission data are of lower resolution than the emission data. The emission data can be collected using a roving zoom technique during an ECT scan. A computation adjusts the transmission data to account for the known location of the emission zoom window on the crystal and for the different pixel sizes between the full field of view transmission scan of the body and the smaller roving electronic field of view emission scan of the body organ.
摘要翻译：一种用于利用检测器的大视野来收集传输信息并且使用相同检测器的小视野窗收集发射数据的方法和装置。该系统采用闪烁检测器的大视野，以便收集被扫描的整个身体的传输数据。这种技术通过获取非截断衰减因子来提高发射数据的定量能力。收集小视场窗口的发射数据，使得高分辨率图像像素用于处理发射数据（例如，特定身体器官）。由于使用大的视野来收集传输数据，所以用于传输数据的成像像素的分辨率低于发射数据。在ECT扫描期间，可以使用粗纱放大技术收集排放数据。计算调整传输数据以考虑在晶体上的发射变焦窗口的已知位置以及身体的全视野透射扫描与身体的较小的粗纱电子视野发射扫描之间的不同像素尺寸器官。

7. 发明授权

US5539202A Modifiable digital dynamic compression table 失效
标题翻译：可修改数字动态压缩表
公开(公告)号：US5539202A
公开(公告)日：1996-07-23
申请号：US317931
申请日：1994-10-03
申请人： Michael Geagan , Donald R. Wellnitz
发明人： Michael Geagan , Donald R. Wellnitz
IPC分类号： G01T1/164 , G01T1/17 , G01T1/208 , G01T1/20
CPC分类号： G01T1/17 , G01T1/1647 , G01T1/208
摘要： A circuit for performing digital dynamic compression wherein the circuit is readily modifiable to accept different compression procedures and the input and output signals are in digital form. The system utilizes a memory unit (e.g., a random access memory or other form of programmable memory, such as EEPROM) to contain a procedure utilized to transform digital input channel signal to an offset digital value which is determined based on the total energy of a gamma interaction. This offset digital value is then subtracted from the digital input channel data to arrive at the output dynamically compressed value. However, given sufficient memory size, the memory circuit may be implemented to directly output the compressed value. Since a programmable memory look up table is utilized to contain the dynamic compression procedure, different dynamic compression procedures may be readily loaded into the memory from a computer system. The compression procedure is implemented such that there are no nonuniformities near the signal range transitions.
摘要翻译：一种用于执行数字动态压缩的电路，其中电路易于修改以接受不同的压缩过程，并且输入和输出信号是数字形式。该系统利用存储器单元（例如，随机存取存储器或其他形式的可编程存储器，例如EEPROM）来包含用于将数字输入通道信号转换为基于一个的总能量确定的偏移数字值的过程伽马相互作用。然后从数字输入通道数据中减去该偏移数字值，得到输出动态压缩值。然而，给定足够的存储器大小，可以实现存储器电路以直接输出压缩值。由于使用可编程存储器查找表来包含动态压缩过程，因此可以从计算机系统容易地将不同的动态压缩过程加载到存储器中。压缩过程被实现为使得在信号范围转换附近没有不均匀性。

8. 发明授权

US6100531A Dual-purpose radiation transmission source for nuclear medicine imaging system 失效
标题翻译：用于核医学成像系统的两用辐射传播源
公开(公告)号：US6100531A
公开(公告)日：2000-08-08
申请号：US62303
申请日：1998-04-17
申请人： Horace H. Hines , Ian Farmer , Peter Nellemann , Lingxion Shao , Hugo Bertelsen
发明人： Horace H. Hines , Ian Farmer , Peter Nellemann , Lingxion Shao , Hugo Bertelsen
IPC分类号： G01T1/164 , G01T1/161
CPC分类号： G01T1/1642
摘要： A dual-purpose transmission source for use in a nuclear medicine imaging system is described. A Cs-137 point source is used to transmit radiation having a 662 keV photopeak to a corresponding detector during a transmission scan of an object. The Cs-137 source can be used in transmission scans for correcting either coincidence or single-photon emission data for non-uniform attenuation. When performing a transmission scan to correct single-photon emission data, a collimator may remain mounted to the detector, since a substantial portion of the transmitted radiation completely penetrates the radiation-absorbing material of the collimator to reach the detector.
摘要翻译：描述了用于核医学成像系统的两用传输源。 Cs-137点源用于在物体的透射扫描期间将具有662keV光尖峰的辐射传输到相应的检测器。 Cs-137源可用于传输扫描，用于校正重合或单光子发射数据，用于非均匀衰减。当执行透射扫描以校正单光子发射数据时，准直器可以保持安装到检测器，因为透射辐射的大部分完全穿透准直器的辐射吸收材料以到达检测器。

9. 发明授权

US5990482A Method and apparatus for performing correction of transmission self-contamination in a medical imaging system 失效
标题翻译：用于执行医疗成像系统中的传输自身污染的校正的方法和装置
公开(公告)号：US5990482A
公开(公告)日：1999-11-23
申请号：US865918
申请日：1997-05-30
申请人： Hugo Bertelsen , Lingxiong Shao
发明人： Hugo Bertelsen , Lingxiong Shao
IPC分类号： G01T1/164 , G01T1/166
CPC分类号： G01T1/1648
摘要： A method of acquiring transmission self-contamination data for correcting transmission scan data in a nuclear camera system including two transmission radiation sources and two scintillation detectors. A first source is for transmitting radiation to only a first detector and a second source is for transmitting radiation to only a second detector during a transmission scan of an object to be imaged. To acquire the calibration data, radiation is transmitted from the second source to the second detector while the first source is maintained in a non-transmitting state. While the second source is transmitting, the first detector is used to detect the radiation transmitted from the second source. A set of self-contamination data is then generated based on the radiation from the second source detected with the first detector. The calibration data is used to correct a subsequent transmission scan of the object by subtracting the self-contamination data from the transmission scan data.
摘要翻译：一种获取用于校正包括两个发射辐射源和两个闪烁检测器的核相机系统中的传输扫描数据的传输自身污染数据的方法。第一来源是用于将辐射传输到仅第一检测器，并且第二源用于在待成像对象的透射扫描期间仅向第二检测器发射辐射。为了获取校准数据，辐射从第二源发送到第二检测器，同时第一源保持在非发射状态。当第二个信号源正在传输时，第一个检测器用于检测从第二个信号源发射的辐射。然后基于用第一检测器检测到的来自第二源的辐射产生一组自污染数据。校准数据用于通过从传输扫描数据中减去自身污染数据来校正对象的后续传输扫描。

10. 发明授权

US5900636A Dual-mode gamma camera system utilizing single-photon transmission scanning for attenuation correction of PET data 失效
标题翻译：双模γ相机系统利用单光子传输扫描对PET数据进行衰减校正
公开(公告)号：US5900636A
公开(公告)日：1999-05-04
申请号：US865916
申请日：1997-05-30
申请人： Peter Nellemann , Hugo Bertelsen , Lingxiong Shao , Horace H. Hines
发明人： Peter Nellemann , Hugo Bertelsen , Lingxiong Shao , Horace H. Hines
IPC分类号： G01T1/161 , G01T1/164 , G01T1/29 , G21K5/10
CPC分类号： G01T1/1611 , A61B6/037 , G01T1/1642 , G01T1/1648
摘要： A nuclear camera system includes a pair of detectors orientated 180 degrees apart about an axis of rotation for detecting radiation emitted from an object, a pair of single-photon radiation point sources for transmitting radiation through the object, each to a different detector, and a gantry supporting the detectors and the radiation sources. The gantry provides rotation of the detectors and the radiation source about the axis of rotation, such that the angular positions of the radiation source about the axis of rotation remain fixed relative to the angular positions of the detectors. The camera system further includes a processing system coupled to control the dectors and the radiation sources and to selectably configure the detectors for either coincidence or single-photon emission imaging. The processing system controls the detectors to acquire coincidence emission data of the object and controls the single-photon point sources to acquire transmission data of the object, wherein the radiation from the point sources has a fanbeam illumination profile. The processing system corrects the acquired coincidence emission data for attenuation using the transmission data.
摘要翻译：核相机系统包括一对围绕旋转轴定向180度的检测器，用于检测从物体发射的辐射;一对单光子辐射点源，用于将辐射通过物体传送到不同的检测器;以及龙门架支持探测器和辐射源。台架提供检测器和辐射源围绕旋转轴的旋转，使得辐射源围绕旋转轴线的角位置相对于检测器的角位置保持固定。相机系统还包括耦合以控制分界器和辐射源的处理系统，并且可选地配置用于重合或单光子发射成像的检测器。处理系统控制检测器以获取对象的重合发射数据，并控制单光点点源以获取对象的传输数据，其中来自点源的辐射具有扇形照明轮廓。处理系统使用传输数据来校正获得的用于衰减的重合发射数据。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式