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A major challenge in computed tomography (CT) is to reduce X-ray dose to a low or even ultra-low level while maintaining the high quality of reconstructed images. We propose a new method for CT reconstruction that combines penalized weighted-least squares reconstruction (PWLS) with regularization based on a sparsifying transform (PWLS-ST) learned from a dataset of numerous CT images. We adopt an alternating...
Recent advances in TOF PET joint estimation of activity and attenuation showed that activity and attenuation can be determined up to a global constant scale without severe crosstalk. MLAA was first proposed to estimate activity and attenuation map simultaneously, and then MLACF was developed to estimate activity and attenuation compensation factor (ACF). MLAA incorporated prior knowledge on the zero...
Fast and accurate quantification of spin-spin relaxation parameter T2 is of importance for clinical MRI applications. Classical spin echo (SE) sequences yield straightforward T2 estimates, but require undesirably long scans. By contrast, steady-state sequences such as the Dual-Echo Steady-State (DESS) sequence are considerably faster, but produce signals that depend on more complex functions of both...
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