Patent ID: 8385620

Claim:
A computed-tomography apparatus, comprising: an x-ray source; an x-ray detector disposed to receive x-rays from said x-ray source; a data collection unit; and a processing unit for performing upsampling with shifting on data collected by said data collection unit to produce upsampled data, and for reconstructing an image using said upsampled data, wherein said processing unit is configured to perform said upsampling using: Out [ seg · K + k ] = ⁢ In ⁡ [ seg - 1 ] · a ⁡ ( - 1 , k ) + ⁢ In [ seg ] · a ⁡ ( 0 , k ) + In [ seg + 1 ] · a ( 1 , k ) = ⁢ ∑ j = - 1 1 ⁢ In ⁡ [ seg + j ] · a ⁡ ( j , k ) where: a(j, k) is the contribution of each of three input data samples, “In” is an input data column, “Out” is an output upsampled data column, seg is a segment (detector row) index, 0≦seg≦Nseg, where Nseg is a number of detector rows in said detector, K is an upsampling factor, K=2, 4, . . . , k is an local upsampled segment index, 0≦k≦K, and j is a local interpolation segment index, j=−1, 0, 1.