Screen Film Radiology
Screen Film Radiology
Screen Film Radiology
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Sensitivity or Speed<br />
v Absolute speed = 1 / Exposure<br />
(R) required to achieve OD = 1.0 +<br />
B + F<br />
v Relative speed of a SF<br />
combination– relative to a common<br />
standard (100 speed),<br />
commercially used<br />
v Most US institutions that use<br />
screen-film use 400 speed for<br />
general radiography<br />
Sensitivity or Speed<br />
v 100-speed – detail work<br />
bony radiographs of<br />
extremities, (thinner screens,<br />
slower, better spatial<br />
resolution)<br />
v 600-speed – angiography<br />
(thicker screens, decreased<br />
spatial resolution)<br />
c.f. Bushberg, et al. The Essential Physics of<br />
Medical Imaging, 2 nd ed., p. 162.<br />
c.f. Bushberg, et al. The Essential Physics of<br />
Medical Imaging, 2 nd ed., p. 162.<br />
33<br />
34<br />
17
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