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Diagnostic Imaging > Chapter 15 > Flashcards

Chapter 15 Flashcards

1
Q

the source of the x-ray beam in an x-ray tube

A

anode target

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2
Q

device used to decrease scatter radiation

A

grip

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3
Q

general amount of blackness in a radiographic image

A

density

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4
Q

electromagnetic radiation of shorter wavelength than light

A

x rays

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5
Q

source of x rays in a dental or portable x ray machine

A

stationary anode

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6
Q

the distance between the source of x ray and image receptor

A

focal film distance

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7
Q

range of shades of grey allowing both bone and soft tissues to be seen at the same exposure setting

A

dynamic range

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8
Q

weakening of sound waves as they enter the body

A

attenuation

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9
Q

device used to make grid lines invisible

A

potter bucky diaphragm

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10
Q

decrease in the strength of the x ray beam near the anode

A

heel effect

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11
Q

current applied to the cathode filament

A

milliamperage

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12
Q

ability to distinguish two adjacent structures on an image

A

spatial resolution

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13
Q

energy that breaks chemical bonds and damages dna

A

ionizing radiation

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14
Q

serves as stationary source of x ray beams

A

rotating anode

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15
Q

difference between blacks and whites in an image

A

contrast

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16
Q

source of electrons in x ray tube

A

cathode

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17
Q

sharpness of radiograph

A

detail

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18
Q

dark structure on radiograph

A

anechoic

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19
Q

b mode

A

brightness mode

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20
Q

radiograph made with cassette

A

computed radiography

21
Q

radiograph uploaded digitally to a computer

A

digital radiograph

22
Q

diagnostic imaging technique used to image moving structure

A

fluoroscopy

23
Q

structure that produces more echoes than surrounding structures

A

hyperechoic

24
Q

measurement of sound frequency

A

Hz

25
Q

structure that has the same brightness as adjacent structures in an ultrasound

A

isoechoic

26
Q

m-mode

A

motion mode

27
Q

computer system used to permanently store and transmit digital images to different computers within a single location or between locations

A

PACS

28
Q

measurement of absorbed radiation that takes into account biological effectiveness of radiation

A

gray

29
Q

unit of absorbed dose of ionizing radiation

A

sievent

30
Q

changing kVp from 50 to 60, changing the focal film distance, removing grid

A

increases radiologic density

31
Q

changing mA from 300 to 200, changing exposure from 1/2 s to 1/4 s

A

decreased radiologic density

32
Q

changing objective film distance from 6 to 12 inches, changing from detail screens to fast screens

A

does not change density

33
Q

reflection of beam when encounters air or gas

A

reverberation artifact

34
Q

layered appearance when US beam cuts through edge of cystic structure and solid tissue

A

shadowing

35
Q

area of darkness resulting from inadequate sound beam penetration through highly reflective or absorbing tissue

A

acoustic enhancement

36
Q

refraction or redirection of the sound beam helpful in identifying round structures

A

edge artifact

37
Q

duplication of an image as a result of reverberation

A

mirror-image artifact

38
Q

when ultrasound beam passes through structure with low attenuation

A

slice-thick artifact

39
Q

part where x ray exits tube

A

window

40
Q

part produces electron cloud when current in applied

A

filament

41
Q

high voltage circuit controls electrical potential between cathode and this part

A

anode

42
Q

part that encases other parts of the tube

A

glass envelope

43
Q

x rays do not emanate from this negatively charged pole

A

cathode

44
Q

part that directs electrons towards anode

A

focusing cup

45
Q

electrons directly impact this part to produce x ray

A

anode target

46
Q

the shorter the wavelength of rays…

A

the greater the energy and penetration

47
Q

kV controls what

A

electrical potential between cathode and anode

48
Q

where electrons impact anode

A

“target”

49
Q

photostimulable phosphor plate is used for what

A

compound radiography

Diagnostic Imaging (2 decks)

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