Which technique is used to eliminate the star effect created during tomographic reconstruction?

The star effect during tomographic reconstruction is a phenomenon that occurs due to the inherent limitations of the reconstruction process, particularly in the application of backprojection methods. Filtered backprojection is designed specifically to address these issues by applying a filter prior to backprojection, which helps to minimize artifacts, including the star effect.

The filtering process works by modifying the raw projection data to enhance the quality of the final reconstructed image. This approach effectively reduces the influence of low-frequency artifacts that can arise from the simple backprojection technique, thereby producing a clearer and more accurate image.

The other techniques mentioned have their own applications in image reconstruction or data processing but do not specifically target the elimination of the star effect in the same direct manner as filtered backprojection does. For example, center of rotation offset correction is used to align data properly but does not directly filter out the artifacts. Oversampling can improve image quality but is not a solution designed to address star artifacts. Iterative reconstruction methods do provide advanced capabilities for image quality improvement but may not explicitly focus on the star effect as filtered backprojection does.

Thus, filtered backprojection stands out as the technique specifically aimed at mitigating the star effect through its filtering process, making it the appropriate choice for this question.