rad231: chapter 33 fluoroscopy

fluoroscopy

a dynamic imaging technique used for active diagnosis during radiography.

image intensification

a technology that enhances image brightness and quality in fluoroscopy.

photocathode

a component that absorbs light photons and emits electrons in an image intensifier tube.

minification gain

the ratio between the area of the input and output screens, indicating brightness increase.

flux gain

the ratio of the number of light photons at the output phosphor compared to those from the input phosphor.

video camera tube

a device that converts light image patterns into electrical signals for video monitoring.

magnification tubes

tubes that increase image size by adjusting voltage supplied to the lenses.

quantum mottle

a blotchy, grainy appearance in images caused by insufficient exposure.

brightness control-abc

an automatic system that maintains image density and contrast in fluoroscopy.

vignetting

an inherent shape distortion where the image edges tend to flare outward.

rods and cones

photoreceptor cells in the retina responsible for night and daylight vision, respectively.

cine system

dynamic recording that captures real-time images in fluoroscopy.

output screen

a glass screen in the image intensifier that converts electrons back into light photons.

optical mirrors

devices that magnify output images using lenses and mirrors, resulting in high resolution.

total brightness gain (tbg)

a measurement indicating the increase in image intensity from an image intensification tube.