Iterative Image Reconstruction with Backprojection

In this series of images, all pixels carrying negative values are marked with a unique green colour except for those negative but close to zero (appr. >-0.7) which are marked dark blue. All postivie values are marked with a grey scale colour bar. Note how quickly large negative values are corrected for. The image essentially doesn't change anymore after the 300 or so iteration, leaving only a few negative values.

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