A penalized weighted least-squares image reconstruction based on scatter correction methods for X-ray CT

For metal artifact reduction (MAR) in X-ray cone-beam computed tomography (CBCT), we propose a penalized weighted least-squares (PWLS) image reconstruction method [1] based on scatter correction (SC) method. Our main contribution is to incorporate the inaccuracy of the scatter correction data in PWLS method, and to accelerate the PWLS image reconstruction with a preconditioned conjugate gradient (PCG) method [2]. The reconstruction results of both the simulation and experimental data show that our proposed method effectively reduces the metal artifacts (MA). Compared to the state of art, normalized metal artifact reduction (NMAR) method [3], our method prevents the introduction of some new artifacts due to an inappropriate interpolation possible used in NMAR.

[1]  S. Richard,et al.  A simple, direct method for x-ray scatter estimation and correction in digital radiography and cone-beam CT. , 2005, Medical physics.

[2]  Rainer Raupach,et al.  Normalized metal artifact reduction (NMAR) in computed tomography. , 2010, Medical physics.

[3]  Caifang Cai,et al.  Joint reduce of metal and beam hardening artifacts using Multi-Energy map approach in X-ray Computed Tomography , 2011, 2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP).

[4]  Lei Zhu,et al.  Noise suppression in scatter correction for cone-beam CT. , 2009, Medical physics.

[5]  Jeffrey A. Fessler.  Penalized weighted least-squares image reconstruction for positron emission tomography , 1994, IEEE Trans. Medical Imaging.

[6]  P. Suetens,et al.  Metal streak artifacts in X-ray computed tomography: a simulation study , 1998, 1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255).