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    • 3. 发明授权
    • Helical rowwise view weighting of computed tomographic images
    • 计算机断层图像的螺旋横向视图加权
    • US06418184B1
    • 2002-07-09
    • US09752275
    • 2000-12-29
    • Sharon X. WangStephen W. MetzJohn A. Fusco
    • Sharon X. WangStephen W. MetzJohn A. Fusco
    • A61B603
    • A61B6/032A61B6/027A61B6/4085Y10S378/901
    • One aspect of the present invention is a method for reconstructing an image of an object utilizing a computed tomographic (CT) imaging system. The method includes steps of: helically scanning an object; interpolating an axial fan beam set of projection data as a vector function {right arrow over (R)}a from a fan beam set of projection data from the helical scan {right arrow over (R)}hi, where i=1, . . . , n is a row index and n represents a of number of rows of the detector array, using a relationship written as: R → a ⁢ ( β , γ ) = ∑ i = 1 n ⁢ w i ⁢ ( β ) ⁢ R → h i ⁢ ( β , γ ) , where wi(&bgr;) is a weighting function written as: w i = ∑ j = 1 m ⁢ f ⁢   ⁢ ( β - β j ) , where m is a number of images used for z smoothing, &bgr;j is a gantry rotation angle for a plane of reconstrution of a jth image, and f ⁢   ⁢ ( x ) = { g ⁢   ⁢ ( x ) , &LeftBracketingBar; x &RightBracketingBar; ≤ β b 0 , &LeftBracketingBar; x &RightBracketingBar; > β b where constants β b = 2 ⁢   ⁢ π p , and g(x) is either a linear or non-linear function.
    • 本发明的一个方面是使用计算机断层摄影(CT)成像系统来重建物体的图像的方法。 该方法包括以下步骤:螺旋扫描物体; 将来自螺旋扫描的投影数据的扇形波束组((R)} hi的右箭头,hi,其中i = 1,...)插入作为向量函数{(R)} a的右箭头的矢量函数的轴向扇形波束组。 。 。 ,n是行索引,n表示检测器阵列的行数,使用写为:其中wi(β)是写入的加权函数,其中m是用于z平滑的图像的数量,betaj 是第j个图像重构平面的机架旋转角,其中常数和g(x)是线性或非线性函数。