Flashcards in Physics Chapter 14 Quiz Deck (15)
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1
Electronic vacuum tube that converts the remnant beam to light, then to electrons, then back to light, increasing the light intensity in the process
image intensifier
2
Metals emit electrons in response to light stimulus
photoemission
3
Expression of the ability of an image intensifier tube to convert x-rat energy into light energy and increase the brightness of the image in the process
brightness gain
4
The ratio of the number of light photons as the output phosphor to the number of light photons emitted in the input phosphor and represents the tube conversion efficiency
flux gain
5
an expression of the degree to which the image is minified from input phosphor to output phosphor
minification gain
6
an expression of the luminance at the output phosphor divided by the input exposure rate, & its unit of measure is the candela per square meter per milliroentgen per second
conversion factor
7
is a function of the fluoroscopic unit that maintains the overall appearance of the fluoro image (contrast & density) by automatically adjusting the kVp, mA, or both
Automatic Brightness Control (ABC)
8
refers to the smallest structures that may be detected in an image. Measured in line pairs per millimeter!
spatial resolution
9
a misrepresentation of the true size or shape of an object
distortion
10
results when insufficient information is present to create the image
image noise
11
is a diode tube contained in a glass envelope to maintain a vacuum. Camera tube most often used!
Vidicon tube
12
an electron gun that provides a continuous stream of electrons & a control grid that forms the electron stream into a beam
Cathode tube (what consist of in fluoro chain)
13
a device that takes the video (analog) signal & divides it into a number of bits (1s &0s) that the computer “understands”
Analog-to-digital converter (ADC)
14
is a light sensitive semiconducting device that generates an electrical charge when stimulated by light & stores this charge in a capacitor
a series of metal oxide semiconductor capacitors, & each capacitor represents a pixel
Charge-coupled device (CCD)
15
