Band artifacts are produced when the projection reading of a single channel or a group of channels consistently deviate from the truth. That can be the result of defective detector cells of DAS (Data Acquisition System) channels, deficiencies in system calibration, or a suboptimal image-generation process. This is predominately a third-generation CT scanner phenomenon. The detector channel reading is always mapped to a straight line that is at a fixed distance to the isocenter of the system, a defective reading forms a ring pattern during the back-projection process.
Note: Band or Ring Artifacts are produced in the same way.
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