Cone-beam reconstruction apparatus and computed tomography apparatus

Cone-beam reconstruction apparatus and computed tomography apparatus

  • CN 1,572,253 B
  • Filed: 06/15/2004
  • Issued: 04/25/2012
  • Est. Priority Date: 06/16/2003
  • Status: Active Grant
First Claim
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1. one kind is obtained the method for data from the computer tomography CT scan, comprising:

  • At least one detector column from the CT system obtains data for projection;

    A weighting function is applied to this data for projection and obtains weighted data, and said weighting function comprises a weight relevant with cone angle, wherein when the absolute value of said cone angle from α

    0To α

    mScope in the time, said weight relevant and α

    with cone angle mWith square being directly proportional of the difference of said cone angle, wherein α

    0Be the cone angle that begins to reduce weight, α

    mBe greater than α

    0Cone angle, α

    mDefine the scope of weighting;

    To said weighted data filtering;

    AndCone angle taken into account said weighted data is carried out back projection.

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