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RAD 104 prelims Flashcards

(58 cards)

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1
Q

What is the FFD in general radiography

A

40 - 42 inches

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2
Q

Is the exactness of representation of the patients anatomy on a radiographic image

A

Radiographic image quality

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3
Q

The degree of overall blackening of a radiograph
Amount of blackness on a given area of radiograph

A

Radiographic density

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4
Q

Combination of setting selected on the control panel

A

Radiographic technique

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5
Q

Uses light to expose the film

A

Intensifying screen

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6
Q

Few variation of black

A

high contrast

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7
Q

The OD that is inherent in the base of the film

A

Base density

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8
Q

Process of taking a radiograph

A

Radiography

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9
Q

Acceptable range for optical density

A

0.25 - 2.0

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10
Q

What is the FFD in the radiography of thoracic cavity

A

72 inches

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11
Q

Principal source of noise

A

Scattered radiation

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12
Q

Most important characteristics of radiographic image

A

spatial resolution
contrast resolution
noise
artifact

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13
Q

Primary control of xray quality (beam penetrability)

A

kilovoltage peak kVp

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14
Q

Too dark = high density = OVEREXPOSED

A

Too light = low density = UNDEREXPOSED

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15
Q

A quantitative factor that when combined with mA determines the exposure rate

A

Exposure time

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16
Q

Device used to reduce the intensity of scatter radiation in the remnant xray beam

A

Grid or Bucky

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17
Q

Blackening

A

Density

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18
Q

Tools for increasing radiographic quality

A

Patient positioning
Image receptor
Selection of exposure factors

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19
Q

Two types of radiation

A

Ionizing
non-ionizing

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20
Q

2 categories of image quality

A

Photographic aspect and Geometric Aspect

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21
Q

Interconnects resolution and noise

A

Speed

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22
Q

Noise that is caused by few xray

A

Quantum mottle

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23
Q

Measured from the focal spot to the recording medium (xray film) and is called FOCAL - FILM DISTANCE (FFD)

A

Distance

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24
Q

Black

25
Controls optical density
mAs
26
Noise that is inherent to Intensifying screen
Structure mottle
27
Process of taking a photograph
Photography
28
milliamperage x exposure time
mAs
29
kVp controls Contrast
mAs controls Density
30
Capability of film to absorb light
Film speed
31
Fog density
0.04
32
Factor that selects the length of the time for an exposure
Exposure time
33
Random fluctuations of the optical density of the radiograph Speckled background on image Grainy or uneven appearance of an image
Noise
34
Variation of density level Goal to make detail visible
Contrast
35
4 significant factors
kVp mA exposure time SID
36
Ability to image small objects that have high subject contrast
Spatial resolution
37
Acceptable base density
0.14
38
Ability to distinguish anatomical structures of similar subject contrast
Contrast resolution
39
Is the most effective method for reducing the scattered radiation
Collimation
40
Law that states that radiation intensity will vary inversely with the square of the distance from the source
Inverse square law
41
Determines number of xray produced Radiation quantity
milliamperage mA
42
Many variation of black
Low contrast
43
ALARA
As low as reasonably achievable
44
Qualities of a good photograph
Composition Focus Evokes emotion or Tells a story
45
The development of the silver grains that contain no useful information
Fog density
46
Acceptable base + fog density
0.18
47
White
Absorption
48
Less precise term for spatial and contrast
Detail
49
Clarity and sharpness of structural lines
Definition
50
Factors that influence and determine the quantity and quality of xrays to which the patient is exposed
Exposure Factor
51
The use of Intensifying screen decreases the patient dose by?
15 - 20
52
Undesired change in the size and shape of the anatomic part
Distortion
53
Is a systematic procedure used by the radiographer to accomplish task of producing a high quality radiograph
Radiographic technique
54
Ejects electron using IR that results to scattered radiation
Compton interaction
55
Capability of screen to produce light
Screen speed
56
FFD is also called
Source - Image Distance (SID)
57
Ability to image 2 separate objects and visually distinguish one from the other
Resolution
58
What causes noise
Insufficient number of xrays Uniform signal produced by scattered radiation Faster screen speed

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