2015 FALL FINAL!!!!!<3 Flashcards Preview

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Flashcards in 2015 FALL FINAL!!!!!<3 Deck (86)
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61

Above 90 kVp:
if you add 15 kV, you must ______

mAs in half

62

Above 90 kVp:
if you take away 15 kV, you must ____

Double mAs

63

Below 90 kVp:
if you add 10 kVp, you must

cut mAs in half

64

Below 90 kVp:
If you subtract 10 kVp, you must _______

double mAs

65

As collimation decreases then density __1__. As collimation increases then density __2__.

1. Increases (b/c larger field size)
2. Decreases (smaller field size)

66

part density and IR density are _____ proportional

inversely

67

Automatic Processor

developer, fixer, washer, dryer

90 seconds to process film

68

Main controlling factor of contrast

kV

69

High kV=
__1__ scale
__2__ contrast
__3__ latitude
__4__ scatter
__5__ penetration
__6__ colors

1. long
2. low
3. wide
4. increased
5. increased
6. many

70

Low kV=
1. scale
2. contrast
3. colors
4. latitude
5. scatter
6. penetration

1. short
2. high
3. few
4. narrow
5. decreased
6. decreased

71

increased grid ratio = ______ contrast

increased

72

increase collimation= ________ contrast

increased

73

First step in protection

OPTIMUM COLLIMATION

74

T
B
M
F
G

Hardest to penetrate to easiest
teeth, bone, muscle, fat, gas

75

Contrast medias:
A. Adds density
B. Takes away density

A. Positive (ex: barium and iodine)
B. Negative (air and CO2)

76

Additive pathology (ex: edema, atelectasis)=_____ kVp

increase

77

destructive pathology (ex: emphysema, osteoporosis)=_______ kVp

decrease

78

Three ways to overcome motion

1. clear instructions
2. Immobilization devices
3. short exposure time

79

Magnification is AKA

size distortion

80

Increase SID and Decrease OID to prevent

size distortion (AKA magnification)

81

Shape distortion is AKA

true distortion

82

This is caused by mal-alignment of tube, part, and/or IR. Usually elongated or foreshortening. Can be done accidently or on purpose

Shape distortion
AKA true distortion

83

if "S" number is too high then the IR is __1__ and image has excessive __2__.

if "S" number is too low then the IR is __3__ and patient maybe ultimately __4__ due to __5__.

1. underexposed
2. Quantum Mottle/Noise
3. Overexposed
4. overdosed
5. dose creep

84

Invisible image

Latent

85

Visible image

Manifest

86

Film Screen>>Digital Term
1. Density/Receptor Exposure
2. Contrast
3. Recorded Detail

1. Brightness
2. Grayscale/dynamic range
3. spatial resolution