Patent ID: 6898264

Claim:
A method of computing images derived from computer tomography detectors, comprising the steps of: (a) collecting cone beam data from a detector during a scan of an object; (b) preprocessing the cone beam data, wherein the step of preprocessing includes (bi) computing the derivative of the said data along the source trajectory ∂ ∂ q ⁢ D f ⁡ ( y ⁡ ( q ) , Θ )  q = s , where D ƒ is the cone beam data, q,s are variables along the source trajectory, y(q) is the source position as a function of q, Θ is a unit vector; (c) identifying lines on a plane DP(s), where s is the parameter along the scan path and DP(s) is any plane intersecting the cone beam; (e) convolving the said preprocessed data along said lines with filter 1/sin(γ), where γ is polar angle in the plane containing the current source position and a said line; (f) back projecting said filtered data to form a precursor of said image; and (g) repeating steps a, b, c, d, e, and f until an image of the object is completed.