3/12/2024 0 Comments Artifact meaning![]() We found that the intensity of the artifacts increases with the contrast of the object, its size, and its distance from the axis of rotation. The effect of the presence of a high contrast object outside the ROI was also studied. For an ROI of 10% FOV, artifacts remained minimal only for the 1/16 th dose case. For an ROI of 30% FOV, artifacts in the reconstructed ROI were minimal for both dose reduction levels. ![]() ROIs in the images were selected and the low-dose data outside the ROI were simulated by adding various levels of noise to the projection data corresponding to a dose of 1/16 and 1/256 of the original dose. High-resolution, high-dose full-field projections of a phantom were obtained. To obtain high-resolution 3D reconstruction of an ROI with minimal artifacts, we have developed a method involving a non-uniform ROI beam filter to reduce dose outside the ROI while acquiring the ROI at a higher dose. High-resolution computed tomography (CT) reconstructions currently require either full field of view (FOV) exposure, resulting in high dose, or region of interest (ROI) exposure, resulting in artifacts.
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