In transmission computed tomography, relative x-ray attenuation measurements are made at various angles around a patient's body. These input projection data are reconstructed to yield a cross-sectional view of internal structure. If the body section contains material that severely attenuates the x-ray beam, high-density bands that obliterate internal structure will be produced in the process of image reconstruction. A technique has been developed that removes this imaging artifact. The approach views the affected projection data as misinformation. These data are assigned new values, and image reconstruction is performed without changing existing hardware or software.
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