MEDRADSC 3K03 Lecture Notes - Lecture 14: Fluoroscopy, Radiography, Thermoluminescence

• School: McMaster University
• Department: Medical Radiation Sciences
• Course: MEDRADSC 3K03
• Professor: Lyndsay Simmons

Document Summary

Ct dose: why has this become a major concern, physicians order them very readily/ backup their judgement, overuse, availability has increased because staffed 24/7, potential for high radiation dose. If not used correctly, need to know how it functions. Dose comparison: conventional radiography, approx 1mgy per examination, fluoroscopy exam is about 40mgy per exam, ct, approx. How does dose distribution differ in gen rad: dose highest at entrance (stationary, exit dose is typically 1% of entrance dose, ct dose distribution is more uniform, except for near the back (table, heavily filtered, source rotates. Long enough to cover 14 contiguous 7 mm slices: electrometer charges are collected and measured by the electrometer, q (cid:1005) (cid:272)oulo(cid:373)(cid:271) = (cid:1005). 6 (cid:454) (cid:1005)(cid:1004)(cid:1005)9 ele(cid:272)tro(cid:374)s. Io(cid:374)izatio(cid:374) (cid:272)ha(cid:373)(cid:271)er i(cid:374) pha(cid:374)to(cid:373) holes s(cid:272)a(cid:374) re(cid:272)ord the (cid:272)harge e(cid:373)itted fro(cid:373) the (cid:272)ha(cid:373)(cid:271)er: next hole or different location, what will happen to dose at various locations, center, periphery (center and periphery sign.