BIOM 101 Lecture Notes - Lecture 18: Mammography, Radioactive Tracer, Computer Monitor
Document Summary
When imaging, an x-ray beam produced by a so-called x-ray tube passes through the body. The body absorbs part of the energy of the x-ray beam. On the opposite side of the body, detectors or a film capture the attuenatued x-rays. Ct, both parts are rotating, for multiple images, and a 3-d final image. Most common are x-ray radiography and ct, mammography, angiography, and fluoroscopy. Different organs and tissues have a different sensitivity to radiation, so it has to be adjusted. Actual risk to body depends on (cid:449)hat"s being x-rayed. Effective dose is the parameter of the dose absorbed by the entire body taking into account these different sensitivities. Computed tomography available si(cid:374)(cid:272)e (cid:373)i(cid:374)d (cid:1005)97(cid:1004)"s a(cid:374)d re(cid:448)olutio(cid:374)ized (cid:373)edi(cid:272)al i(cid:373)agi(cid:374)g. Single rotation gives several thousand section views, then can be reconstructed into cross- sectional images of the body. More detailed image than conventional x-ray, especially for soft tissues.
