BLG 10A/B Study Guide - Final Guide: Digital Subtraction Angiography, Positron Emission Tomography, X-Ray
26 Aug 2018
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X ray (radiograph): produces shadowy negative image of internal structures by directing x rays (electromagnetic waves of short wavelength) at body. Dense structures absorb x rays more and appear light. Hollow structures absorb x rays less and appear dark. Often used to visualize hard, bony structures and locate abnormally dense structures. Computerized axial (computed) tomography (cat/ct): produces cross-section image by a rotating x ray tube that goes around the body. Often used for problems affecting brain and abdomen. Xenon ct: ct brain scan enhanced with inhaled radioactive xenon gas to quickly trace blood flow (absence of xenon from brain indicates stroke is occurring) Dynamic spatial reconstruction (dsr): produces 3d image of body organs and their movements by ultrafast ct scanners. Often used to visualized heart beating and blood flowing through vessels. Provides information on heart defects, constricted or blocked blood vessels etc.
