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Factor analysis of dynamic PET images: beyond Gaussian noise

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Academic year: 2021

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Fig. 1. β-divergence d β ( y|x) as a function of x with y = 1 and for different values of β.
Fig. 2. PSNR mean and standard deviation obtained on the 6it ( left ) and 50it ( right ) images after factorization with β-NMF with fixed ( top ) and estimated ( bottom ) factor TACs over 64 samples.
Fig. 4. From top to bottom: factor proportions (A 2: K ) from non-specific gray matter, white matter and blood obtained with β-SLMM for β = 0, 1, 2.
Fig. 6. From left to right: Transversal, coronal and sagital planes ( top to bottom ) of MRI ground truth of the stroke zone, factor proportions (A 1 ) from specific gray matter and variability matrices (B) obtained with β-SLMM for β = 0, 1, 2.

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