Dynamic angle selection in X-ray computed tomography

• We propose the dynamic angle selection algorithm for CT scanning.
• The approach is based on the concept of information gain over a set of solutions.
• Projection angles are selected based on the already available projection data.
• The approach can lead to more accurate results from fewer projections.

In X-ray tomography, a number of radiographs (projections) are recorded from which a tomogram is then reconstructed. Conventionally, these projections are acquired equiangularly, resulting in an unbiased sampling of the Radon space. However, especially in case when only a limited number of projections can be acquired, the selection of the angles has a large impact on the quality of the reconstructed image. In this paper, a dynamic algorithm is proposed, in which new projection angles are selected by maximizing the information gain about the object, given the set of possible new angles. Experiments show that this approach can select projection angles for which the accuracy of the reconstructed image is significantly higher compared to the standard angle selections schemes.