SCATTER CORRECTION METHOD AND APPARATUS FOR COMPUTED TOMOGRAPHY IMAGING

摘要

A method and apparatus to correct for scatter in projection data by successive approximations of a primary-beam estimate and a scatter estimate. The scatter estimate is calculated by convolving a scattering function, which is a function of the primary-beam estimate, with a smoothing function that includes Rayleigh scattering and Compton scattering terms. The scattering function is greater than zero in the limit that the primary-beam estimate goes to zero. The projection data can be X-ray computed tomography projection data, and the choice of scattering function has the benefit of reducing dark-band artefacts in reconstructed computed tomography images.

主权项

1. An apparatus for scatter correction of projection data, the apparatus comprising:
processing circuitry configured to
calculate a primary-beam estimate Pn, andcalculate a scatter estimate Sn using a convolution between a scattering function, SF(Pn), and a smoothing function G,wherein Pn is a current primary-beam estimate, Sn is a current scatter estimate, and SF(Pn) is a predetermined scatter function that is a function of the current the primary-beam estimate and is greater than zero over the range 0≦Pn<1.