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公开(公告)号：EP0564292B1
公开(公告)日：1998-12-02
申请号：EP93302599.1
申请日：1993-04-01
发明人： Brunnett, Carl J. , Mattson, Rodney A. , Burke, James E. , Miller, Lester , Resnick, Theodore A.
CPC分类号： A61B6/035 , A61B6/032 , A61B6/4028 , A61B6/405 , A61B6/4275 , A61B6/4488 , A61B6/482 , A61B6/56 , H01J35/02 , H01J35/06 , H01J35/10 , H01J35/165 , H01J35/24 , H01J2235/162 , H05G1/025 , H05G1/06 , H05G1/08 , H05G1/20 , H05G1/26 , H05G1/34 , H05G1/52 , H05G1/60 , H05G1/66
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公开(公告)号：EP0412657B1
公开(公告)日：1995-04-19
申请号：EP90307596.8
申请日：1990-07-11
CPC分类号： G06T11/006 , G06T1/20 , G06T2211/428
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公开(公告)号：EP0564292A2
公开(公告)日：1993-10-06
申请号：EP93302599.1
申请日：1993-04-01
发明人： Brunnett, Carl J. , Mattson, Rodney A. , Burke, James E. , Miller, Lester , Resnick, Theodore A.
CPC分类号： A61B6/035 , A61B6/032 , A61B6/4028 , A61B6/405 , A61B6/4275 , A61B6/4488 , A61B6/482 , A61B6/56 , H01J35/02 , H01J35/06 , H01J35/10 , H01J35/165 , H01J35/24 , H01J2235/162 , H05G1/025 , H05G1/06 , H05G1/08 , H05G1/20 , H05G1/26 , H05G1/34 , H05G1/52 , H05G1/60 , H05G1/66
摘要： A toroidal x-ray tube (I) is supported (II) for rotation about a horizontal axis (170) , translation along a vertical axis (172) , and translation along a horizontal axis (174) . The x-ray tube includes a toroidal housing (A) , an annular anode (B) , and a cathode (C) which rotates a beam of electrons around the annular anode. A plurality of parallel connected voltage sources (90₁, 90₂, ..., 90 n ) provide a sufficiently high bias voltage between the electron source and the anode that x-rays are generated. The x-ray beam passes through a compensator crystal (62) , an annular window (20) , a collimator (132) , through a subject received in a central bore (26) of the x-ray tube, and impacts an arc segment of radiation detectors (130) . The x-ray detectors are stationarily mounted outside of the plane of the annular window (FIGURES 2 and 7), nutate into the plane of the windows opposite of the origin of the x-ray beam (FIGURE 6), rotate in part (FIGURE 9) or rotate in full (FIGURE 8). Angular position monitors (58, 154) determine the angular position of the cathode assembly, hence the x-ray beam, and the angular position of the detectors in the rotating detector embodiment.
摘要翻译： 环形X射线管（I）被支撑（II），用于围绕水平轴线（170）旋转，沿着垂直轴线（172）平移并且沿着水平轴线（174）平移。 X射线管包括使环形阳极周围的电子束旋转的环形壳体（A），环形阳极（B）和阴极（C）。 多个并联的电压源（901,902，...，90n）在产生x射线的电子源和阳极之间提供足够高的偏置电压。 x射线束穿过受体在X射线管的中心孔（26）中的受试者通过补偿晶体（62），环形窗（20），准直器（132），并撞击弧段 的辐射探测器（130）。 x射线探测器固定安装在环形窗的平面外面（图2和7），并形成与X射线束原点相反的窗口平面（图6），部分旋转 9）或完全旋转（图8）。 角位置监视器（58,154）确定阴极组件的角度位置，因此确定旋转探测器实施例中的X射线束和检测器的角位置。
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公开(公告)号：EP0212836A1
公开(公告)日：1987-03-04
申请号：EP86305390.6
申请日：1986-07-14
CPC分类号： G01T1/202 , G01T1/2018
摘要： A radiation imaging apparatus and method e.g. for computed tomography x-ray.imaging employing a radiation detector which enhances the detector output due to lower energy components of the incident radiation. One embodiment includes first and second layers (190, 192) of crystalline scintillation material mutually aligned in a path of x-rays to be detected, to receive the x-rays in sequence. The layer (190) upstream in the x-ray path comprises a scintillation material having a relatively high efficiency for converting x-ray energy to light. The downstream layer (192) comprises a scintillation material having a relatively lower efficiency for x-ray/light conversion. A photodiode (198) is positioned to view both scintillation layers (190, 192) simultaneously and to respond to scintillations in either or both. Scintillation crystal material surfaces can be coated with reflective material (194) to enhance the effects of their scintillations. The photodiode (198) thus combines x-ray indicating scintillations from both crystals while in analog form. Another embodiment comprises a photodiode and an optically coupled scintillation crystal, with the photodiode upstream in the x-ray beam path relative to the crystal (Fig. 4).
摘要翻译： 辐射成像装置和方法 对于使用由于入射辐射的较低能量分量而增强检测器输出的辐射检测器的计算机断层摄影X射线成像。 一个实施例包括在待检测的x射线的路径中相互对准的晶体闪烁材料的第一和第二层（190,192），以顺序接收X射线。 x射线路径上游的层（190）包括具有将X射线能量转换成光的相对较高效率的闪烁材料。 下游层（192）包括具有相对较低的x射线/光转换效率的闪烁材料。 定位光电二极管（198）以同时观察闪烁层（190,192）并且在两者之一或两者中对闪烁进行响应。 闪烁晶体材料表面可以涂覆有反射材料（194）以增强其闪烁的影响。 因此，光电二极管（198）组合了来自两个晶体的X射线指示闪烁，同时以模拟形式。 另一个实施例包括光电二极管和光耦合闪烁晶体，其中光电二极管相对于晶体在x射线束路径上游。
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公开(公告)号：EP0475563B1
公开(公告)日：1997-07-23
申请号：EP91304342.8
申请日：1991-05-15
IPC分类号： A61B6/03
CPC分类号： A61B6/032 , A61B6/5205 , G01T1/2985
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公开(公告)号：EP0412657A2
公开(公告)日：1991-02-13
申请号：EP90307596.8
申请日：1990-07-11
CPC分类号： G06T11/006 , G06T1/20 , G06T2211/428
摘要： An imaging apparatus and method acquires image data from a non-invasive examination of a subject. The data is transferred among various agents (20, 30, 40, 50, 60. 70) on a data bus (B). A data acquisition agent (20) receives the image data from the non-invasive examination and generates subsequent agent locations and transmits the subsequent agent locations and the packets of image data along the data bus. Various image processing agents (30, 40, 50) each receive packets of data transmitted with that agent's location and performs imaging and processing operations on the data packets generating another agent location and thereafter transmitting the other agent location and process data packets along the data bus. A display agent (60) receives the processed image data packets from one of the image processing agents via the data bus, stores the processed image data packets and communicates the process image data to a man-readable image display (68).
摘要翻译： 成像装置和方法从对象的非侵入性检查获取图像数据。 在数据总线（B）上的数据在各种代理（20,30,40,50,60,70）之间传送。 数据采集代理（20）从非侵入性检查接收图像数据，并产生后续代理位置，并沿数据总线发送后续代理位置和图像数据分组。 各种图像处理代理（30,40,50）各自接收利用该代理的位置发送的数据包，并对生成另一代理位置的数据分组执行成像和处理操作，然后沿数据总线发送其他代理位置和处理数据分组 。 显示代理（60）经由数据总线从图像处理代理之一接收经处理的图像数据分组，存储经处理的图像数据分组，并将处理图像数据传送到人类可读图像显示（68）。
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公开(公告)号：EP0195869A2
公开(公告)日：1986-10-01
申请号：EP85309395.3
申请日：1985-12-20
IPC分类号： G06F15/62
CPC分类号： G06T11/006 , G06T5/10 , G06T5/20 , G06T2207/10081 , G06T2207/20056 , G06T2211/421
摘要： An imaging method and apparatus having a new and improved data filter. In one application of the invention computed tomography number inaccuracies are avoided by use of a new filter function derived from discrete points of a truncated spatial domain convolution filter. The points from the truncated convolution filter are fourier transformed to yield a ramp filter with ripple in the spatial frequency domain. Data from a CT scan is filtered with this new filter function and back projected to produce images that do not exhibit CT number inaccuracies.
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公开(公告)号：EP0475563A1
公开(公告)日：1992-03-18
申请号：EP91304342.8
申请日：1991-05-15
IPC分类号： A61B6/03
CPC分类号： A61B6/032 , A61B6/5205 , G01T1/2985
摘要： A CT scanner (10) includes a radiation source (12) mounted for rotation about a scan circle (14). A ring of radiation detectors (30) includes narrow detectors (30n) and wide detectors (30w). The narrow and wide detectors are separately sampled (42n, 42w) and operated on with different digital filters (50n, 50w). The wider detectors have a more limited frequency response (32) which typically includes an out of phase response portion (36); whereas, the output signal from the narrow detector has a higher frequency response (34), i.e. better resolution. The filters (50n, 50w) are selected to yield optimum signal to noise ratio. When the data is merged (60), the resultant data has a modulation transfer function with response (62) which has a higher frequency component or improved resolution relative to response (70) that would be obtained from detectors of uniform width of the average of the narrow and detector widths.
摘要翻译： CT扫描器（10）包括安装成绕扫描圆（14）旋转的辐射源（12）。 辐射检测器（30）的环包括窄检测器（30n）和宽检测器（30w）。 窄和宽检测器分别采样（42n，42w），并使用不同的数字滤波器（50n，50w）进行操作。 较宽的检测器具有更有限的频率响应（32），其通常包括异相响应部分（36）; 而来自窄检测器的输出信号具有更高的频率响应（34），即更好的分辨率。 滤波器（50n，50w）被选择以产生最佳的信噪比。 当数据被合并（60）时，所得到的数据具有响应（62）的调制传递函数，其具有相对于响应（70）具有更高的频率分量或改进的分辨率，该响应（70）将从均匀宽度的检测器获得 窄和检测器宽度。
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公开(公告)号：EP0370829A3
公开(公告)日：1992-02-12
申请号：EP89312231.7
申请日：1989-11-24
IPC分类号： G06T1/20
CPC分类号： G06T11/006
摘要： A CT scanner (10) generates views of data such as equal angular increment detector fan views (Figure 2A) which are convolved or filtered by an array processor (24). A combined backprojector and forward projector (28) backprojects the data from the array processor into an output memory (30) and forward projects lines of image representation data from an input memory (26) to the output memory. Each view representation may again be an equal angular increment detector fan format view (Figure 2A), a parallel ray format view (Figure 2B), an equal linear increment source fan format view (Figure 2D), a source fan format view (Figure 2C), an equal angular incremental detector fan format view (Figure 2E), an equal linear increment detector fan format view (Figure 2F), or an equal angular increment source fan format view (Figure 2G). In a backprojector mode, the projector is addressed by line and row addresses of a pixel of the output memory. A look-up table (76) and a multiplier (82) generate a weighting function (W). A multiplier (78) and an adding means (80) along with the look-up table convert the memory addresses into an appropriate address for a line of view data stored in a projector memory (60). An element of view data retrieved in response to the received address is multiplied (84) by the weighting function. In a forward projector mode, a parallel ray forward projection configuration (92) is provided. A view format transform assembly (90) transforms other format view designations and addresses into the corresponding parallel ray format view designations and addresses.
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公开(公告)号：EP0412657A3
公开(公告)日：1991-05-29
申请号：EP90307596.8
申请日：1990-07-11
CPC分类号： G06T11/006 , G06T1/20 , G06T2211/428
摘要： An imaging apparatus and method acquires image data from a non-invasive examination of a subject. The data is transferred among various agents (20, 30, 40, 50, 60. 70) on a data bus (B). A data acquisition agent (20) receives the image data from the non-invasive examination and generates subsequent agent locations and transmits the subsequent agent locations and the packets of image data along the data bus. Various image processing agents (30, 40, 50) each receive packets of data transmitted with that agent's location and performs imaging and processing operations on the data packets generating another agent location and thereafter transmitting the other agent location and process data packets along the data bus. A display agent (60) receives the processed image data packets from one of the image processing agents via the data bus, stores the processed image data packets and communicates the process image data to a man-readable image display (68).
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