X-Ray Computed Tomography

Slides on computed tomography, which overcomes the limitations of two-dimensional radiography by forming a three-dimensional image and making soft tissue easy to view. Takes the machine apart: the gantry geometry, the computer that presents the information in visual form together with the manipulative aids that assist diagnosis, and the storage unit that keeps studies for subsequent analysis. Notes that technical advancement has been in speed and application while the basic concept has stayed much the same, and treats patient dose, where image noise falls only if the dose is raised, with typical head and body doses of 2.5 rads and 1 to 2 rads, and what multi-slice operation changes.