Principles and Concepts of Computed Tomography

摘要: The final CT image is actually made of a grid tiny squares called pixels. scale grays assigned to each pixel represents the attenuation x-rays by structures in tomographic slice. Manipulation gray allows optimal visualization all tissues within This control over and absence structure superimposition are advantages conventional x-ray techniques. steps used acquire collection data from patient (recording transmitted intensities many angles), computer processing (mathematical calculation slice), display (assigning appropriate evaluate structures), storage series images on film archiving for later review). Common artifacts that must be identified interpreted as such include aliasing, ring artifacts, beam hardening effect, metal, motion, partial volume averaging, streaking out-of-field objects.