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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：EP0370829B1
公开(公告)日：1996-09-25
申请号：EP89312231.7
申请日：1989-11-24
IPC分类号： G06T1/20
CPC分类号： G06T11/006
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公开(公告)号：EP0370829A2
公开(公告)日：1990-05-30
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.
摘要翻译： CT扫描器（10）产生数据的视图，例如由阵列处理器（24）进行卷积或滤波的等角度增量检测器风扇视图（图2A）。 组合的后投影仪和前投影机（28）将来自阵列处理器的数据反向投影到输出存储器（30）中，并将投影线图像表示数据从输入存储器（26）转发到输出存储器。 每个视图表示可以再次是相等的角度增量检测器风扇格式视图（图2A），平行光线格式视图（图2B），相等的线性增量源风扇格式视图（图2D），源风扇格式视图（图2C ），等角度增量检测器风扇格式视图（图2E），相等的线性增量检测器风扇格式视图（图2F）或相等角度增量源风扇格式视图（图2G）。 在反投影仪模式下，投影机由输出存储器的像素的行和行地址寻址。 查找表（76）和乘法器（82）产生加权函数（W）。 与查找表一起的乘法器（78）和加法装置（80）将存储器地址转换为存储在投影仪存储器（60）中的视线数据的适当地址。 通过加权函数将响应于接收到的地址检索的视图数据的元素乘以（84）。 在前投投影模式中，提供平行射线向前投影配置（92）。 视图格式转换组件（90）将其他格式视图名称和地址转换为相应的并行光线格式视图指定和地址。
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