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Quantification of anatomical structure preservation. (a) Sparse FBP for reference. (b) CNNMAR-1 and (c) CNNMAR-2 outputs. (d) Standard deviation of the gradient magnitude image is evaluated region between two metal tulip heads that contain pertinent anatomical content (spinal canal) and avoid high-frequency artifacts [exemplary ROI shown in red boxes (b) and (c) with gradient magnitude image to the right]. Higher values indicate that more anatomy is preserved.
