Method and system for substantially reducing ring artifact based upon ring statistics

摘要

The current invention is generally related to an image processing method and system for substantially reducing ring artifacts. Using the attenuation data, the ring artifacts are substantially prevented based upon two-step process, and the second ring artifact reduction step removes the undesirable rings based upon previously determined statistical data including mean and standard deviation.

主权项

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.