Reconstruction of Xª²Ray Tube Spectra from
Attenuation Data
Chen Xi£¬Mou Xuanqin£¬Yang Ying
£¨School of Electronics and Information Engineering£¬Xi'an¡¡Jiaotong¡¡University£¬Xi'an
710049£¬China£©
Abstract£ºIn order to obtain the perfect information of tube spectra so as to control
X-ray radiation dose and evaluate image quality£¬ a method for spectral reconstruction in
mammography was presented based on a physical model£¬in which the parameters of the model
were estimated through a nonlinear leastª²square method using attenuation data with
different thickness£¬ and then the tube spectra applied to the mammography was
reconstructed. In contrast with the conventional methods£¬ the proposed reconstruction is
constrained by the spectral model and the influence of measurement errors from attenuation
data is effectively restrained. Experimental results show that when attenuation data
contains Poisson noise with 1£¥ standard error£¬ for tungsten anode with tube voltage 35
kV and 45 kV the error of the reconstruction is 4.03£¥ and 2.92£¥ respectively£» for
molybdenum anode with tube voltage 20 kV and 30 kV the error is 6.68£¥ and 8.41£¥
respectivelyª±
Keywords£ºmammography£» spectral model£» spectral reconstruction£» attenuation data