Xiaoye Wu,Dan Xu,Naveen Chandra,Zhanyu Ge,Jiang Hsieh,Daniel David Harrison,Mary Sue Kulpins
申请号:
US12883631
公开号:
US08315352B2
申请日:
2010.09.16
申请国别(地区):
US
年份:
2012
代理人:
摘要:
An imaging system includes an x-ray source that emits a beam of x-rays toward an object, a detector that receives high frequency electromagnetic energy attenuated by the object, a data acquisition system (DAS) operably connected to the detector, and a computer operably connected to the DAS. The computer is programmed to compute detector coefficients based on a static low kVp measurement and a static high kVp measurement, capture incident spectra at high and low kVp during fast kVp switching, compute effective X-ray incident spectra at high and low kVp during fast kVp switching using the captured incident spectra, scan a water phantom and normalize the computed detector coefficients to water, adjust the computed effective X-ray incident spectra based on the normalized detector coefficients, compute basis material decomposition functions using the adjusted X-ray incident spectra, and generate one or more basis material density images using the computed basis material decomposition functions.