Physics Chapter 14 Quiz

Question 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

Answer 1

image intensifier

Question 2

Metals emit electrons in response to light stimulus

Answer 2

photoemission

Question 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

Answer 3

brightness gain

Question 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

Answer 4

flux gain

Question 5

an expression of the degree to which the image is minified from input phosphor to output phosphor

Answer 5

minification gain

Question 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

Answer 6

conversion factor

Question 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

Answer 7

Automatic Brightness Control (ABC)

Question 8

refers to the smallest structures that may be detected in an image. Measured in line pairs per millimeter!

Answer 8

spatial resolution

Question 9

a misrepresentation of the true size or shape of an object

Answer 9

distortion

Question 10

results when insufficient information is present to create the image

Answer 10

image noise

Question 11

is a diode tube contained in a glass envelope to maintain a vacuum. Camera tube most often used!

Answer 11

Vidicon tube

Question 12

an electron gun that provides a continuous stream of electrons & a control grid that forms the electron stream into a beam

Answer 12

Cathode tube (what consist of in fluoro chain)

Question 13

a device that takes the video (analog) signal & divides it into a number of bits (1s &0s) that the computer “understands”

Answer 13

Analog-to-digital converter (ADC)

Question 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

Answer 14

Charge-coupled device (CCD)

Question 15

The fluoroscopic unit Increases the voltage to the electrostatic focusing lenses, resulting in only those electrons from the center area of the input phosphor interacting with output phosphor contributing to the image, giving the appearance of magnification

Answer 15

Magnification Mode