Physics Chapter 14 Quiz Flashcards Preview

spring 2015 > Physics Chapter 14 Quiz > Flashcards

Flashcards in Physics Chapter 14 Quiz Deck (15):
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

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

Magnification Mode