Patent ID: 8929507
Filing Date: 2015-01-06
Classification: A61B,G01N,G06T

Abstract:
1. A method of substantially reducing ring artifacts in CT images, comprising the steps of: a) generating attenuation data from detected intensity signals that have been detected at a data acquisition circuit after being attenuated through an object; b) identifying ring-causing components in the attenuation data using a predetermined high-pass filter at a ring reduction device; c) preventing unintended side-effects from said step b) by applying a predetermined first judgment function including fuzzy logic to the identified ring-causing components at the ring reduction device; d) further correcting the identified ring-causing components using a predetermined second judgment function at the ring reduction device to generate corrected ring-causing components, the second judgment function depending upon a mean value and a standard deviation value of the ring-causing components; and e) subtracting the corrected ring-causing components from the attenuation data at the ring reduction device.