Patent ID: 7853056

Claim:
A method of operating a medical tomographic imaging system comprising the steps of: radiating an object from at least two different directions and so that at least part of radiation penetrates through the object; receiving radiation that penetrates through the object to form a limited amount of one-dimensional or two-dimensional image information of said object; storing said limited amount of one-dimensional or two-dimensional image information on a computer readable medium; running an iterative reconstruction calculation on a computer processor to calculate two-dimensional or three-dimensional image information from said limited amount of one-dimensional or two-dimensional image information of said object; and operating the computer processor to transform said limited amount of image information to a functional transform domain during said method; wherein said limited amount of one-dimensional or two-dimensional image information is transformed to a functional transform domain prior to the step of running the iterative reconstruction calculation to enable the iterative reconstruction calculation to be made with matrix element wise multiplication in sequential order to thereby lower the computer cache miss rate during said iterative reconstructive calculation.