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Helical rowwise view weighting of computed tomographic images

  • US 6,418,184 B1
  • Filed: 12/29/2000
  • Issued: 07/09/2002
  • Est. Priority Date: 12/29/2000
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for reconstructing an image of an object utilizing a computed tomographic (CT) imaging system having a radiation source and a multislice detector array on a rotating gantry, the radiation source configured to project a beam of radiation through an object and towards the multislice detector array, the multislice detector array configured to sense attenuation of the radiation passing through the object;

  • said method comprising the steps of;

    helically scanning an object with a computed tomographic imaging system to acquire a plurality of slices of projection data;

    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=1n


    wi

    (β

    )


    R

    hi


    (β

    ,γ

    )
    ,
    embedded imagewhere wi

    ) is a weighting function written as;

    wi=

    j=1m


    f





    (β

    -β

    j
    )
    ,
    embedded imagewhere m is a number of images used for z smoothing, β

    j is a gantry rotation angle for a plane of reconstrution of a jth image, and f





    (x)
    ={g





    (x)
    ,


    x



    β

    b
    0,

    x

    >

    β

    b
    embedded imagewhere constants β

    b
    =2





    π

    p
    ,
    embedded image

    and g(x) is either a linear or non-linear function.

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