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11.发明授权Computed tomography scanning apparatus and method for generating parallel projections using non-parallel slice data 失效计算机断层扫描装置和用于使用非并行切片数据产生并行投影的方法
公开(公告)号：US5881122A
公开(公告)日：1999-03-09
申请号：US948492
申请日：1997-10-10
CPC分类号： A61B6/032 , A61B6/027 , Y10S378/901
摘要： A nutating slice CT image reconstruction apparatus and method generates a set of projection data using helical cone-beam scanning. The three-dimensional projection data is used to reconstruct a series of planar image slices. The slices are selected such that they define a tilt angle and a rotation angle with respect to the longitudinal axes of the object being scanned. Successive slices have equal tilt angles but changing rotation angles such that normal axes of successive slices define a nutation and precession about the longitudinal axis of the object. Projection data for the tilted slices are formed of selected one-dimensional fan-beam data. As such, the projection data can be applied to conventional two-dimensional reconstruction approaches to generate an image. The projection data can also be used to generate two-dimensional projection images at one or more stationary projection angles through an object being scanned. The nutation or tilt of image volume elements can be compensated for to provide a more accurate image and more accurate target assessment such as accurate total mass determination. A parallel processing architecture can be used to generate and process the nutated slices with improved efficiency.
摘要翻译： 章动切片CT图像重建装置和方法使用螺旋锥束扫描产生一组投影数据。 三维投影数据用于重建一系列平面图像切片。 切片被选择为使得它们相对于被扫描物体的纵向轴线限定倾斜角度和旋转角度。 连续切片具有相等的倾斜角度，但是改变旋转角度，使得连续切片的法线定义关于物体的纵向轴线的章动和进动。 倾斜切片的投影数据由选定的一维扇形光束数据形成。 因此，投影数据可以应用于常规的二维重建方法以产生图像。 投影数据还可用于通过被扫描物体在一个或多个固定投影角度产生二维投影图像。 可以补偿图像体积元件的章动或倾斜，以提供更准确的图像和更准确的目标评估，例如准确的总质量确定。 可以使用并行处理架构来提高效率来生成和处理章程切片。
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