ALARA	As-low-as-reasonably-achievable
AMP	Approximate message passing
ART	Algebraic reconstruction technique
BEP	Bilateral edge preserving
CT	Computer tomography
DCT-GAMP	Denoising CT generalized Approximate message passing
DGT	Discrete gradient transform
FBP	Filtered backprojection
FFT	Fast Fourier transform
MAP	Maximum a posteriori
MMSE	Minimum mean square error
OS-SART	Ordered subset simultaneous algebraic reconstruction technique
PSNR	Peak signal-to-noise ratio
TV	Total variation
SART	Simultaneous algebraic reconstruction technique
SSIM]	Structural similarity
VW-SART	Variable weighted simultaneous algebraic reconstruction technique