Feature-Sensitive Ring Artifact Correction for Computed Tomography

Abstract In computed tomography (CT) reconstruction, ring artifacts emerge from incorrectly normalized or defective detector elements. Correction algorithms often introduce blur do not correctly accommodate the behaviour of those artifacts. Normalization errors stem noise in images during normalization process and are always present to some degree. We propose a method for correcting elements sinogram. Our approach compensates both individual gain as well offset pixel values. reduce by inferring information each its neighbors only subset all projections. show with datasets real measurments that our is effective at mitigating shortcomings purely based approaches using Furthermore, can be efficiently implemented compensating most overhead times. Under usual circumstances, function no additional time all.