Mobile Radiography

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60 Terms

1

40in is how many cm?

100cm

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2

56in is how many cm

140cm

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3

72in is how many cm

180cm

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4

What are some equipment to watch out for

Leads, Oxygen tube, vascular lines

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5

with difficult or uncooperative patients, chest X-rays should be performed in a what position?

Semi-erect

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6

Air-fluid level demonstrates best in what position?

Erect

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7

If air-fluid level visualization is needed how many projections may be needed?

2 projections

One for air fluid level

One normal projection of the chest

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8

Rechargeable batteries use how many volt outlet

110-120 volt outlet

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9

Mobile units come with built in what for immediate display of the image?

Monitors and flat panel detector systems

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10

Generators in mobile units produce output that is?

High frequency

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11

What type of equipment was used before high frequency generators

Capacitor discharge units

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12

Generators’ battery operates on which phase?

Three phase

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13

List technical factor selection considerations

KVP

MAs

Distance

Grids

Exposure switch

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14

Full power, high frequency units that are battery operated produce what type of ripple making it as efficient as a stationary unit

Little ripple

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15

Which distance should be used when 40” & 72” cannot be achieved

56”

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16

Which frequency is preferred for mobile radiography

High frequency 178-200 lpi

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17

Which dimension and focal range grid is preferred for mobile radiography

Short dimension

Wide focal range 40”-72”

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18

This is a radiographic technique that employs motion to show anatomical structures lying in a plane of tissue while blurring or eliminating the detail in images of structures above and below the plane of interest

Tomography

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19

What year was tomography first developed?

1921

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20

Tomography is most useful for which diagnostic modality?

3D mammography

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21

What are other names for tomography?

Planigraphy

Laminography

Stratigraphy

Sectional radiography

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22

Pivot point around which the motions of the tube and image receptor are centered

Fulcrum

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23

The longer the blurring, what happens to sharpness?

Less sharpness

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24

The shorter the blurring, what happens to sharpness?

Sharper image

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25

What is the relationship between fulcrum and blurring?

Direct

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26

Define Tomographic Amplitude

Arc, angle or distance the tube travels without an exposure

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27

What is the relationship between the tomographic amplitude and the section thickness?

Inverse

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28

The tomographic amplitude is __ or equal to the exposure amplitude

Greater than

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29

Define Exposure Amplitude

Arc, angle, or distance the tube travels during an exposure

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30

The exposure amplitude is __ or equal to the tomographic amplitude

Less than

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31

This is the streaking or smearing that results in the loss of recorded detail of objects outside the focal plane

Blur

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32

What is the relationship between blurring and image receptor exposure of objects

Inverse

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33

Increased blurring causes what type of exposure?

Decreased exposure

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34

List four things blur is affected by

Orientation of tube motion

Distance from the fulcrum

Distance from the image receptor

Exposure amplitude

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35

Exposure amplitude has what type of relationship to blur width?

Direct

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36

Distance from the fulcrum has what type of relationship to blur width?

Direct

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37

Distance from the image receptor has what type of relationship to blur width?

Direct

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38

Orientation of tube motion has what type of relationship with blur width?

Direct

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39

Phantoms are sometimes called?

Blur edges

Blur margin

Blur overlap

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40

These are false images and are dangerous to the diagnostic process

Phantoms

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41

Phantoms are produced during complex tomographic motions, especially what?

Circular

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42

What determines the focal plane and controls the section level?

Fulcrum

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43

This is often referred to as the section although the terms section level, layer height, object plane & depth of focus is also used

Focal plane

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44

This is the region within, which the image exhibits satisfactory special resolution and is controlled by the level of the fulcrum

Focal plane

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45

This is the width of the focal plane and is controlled by the exposure angle

Section thickness

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46

Exposure angle has what type of relationship to section thinckness?

Inverse

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47

Section thickness occurs in what type of plane to the image receptor?

Parallel

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48

What is the distance between fulcrum levels?

Section interval

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49

T/F: section interval should exceed the section thinckness

False : section interval should NOT exceed the section thinckness

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50

Tomography was first achieved by what type of motion?

Linear

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51

Digital radiographic tomography is called what?

Digital tomoaynthesis

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52

How many exposures does the tomosynthetic processing require?

10 exposures

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53

Complex tomographic motions often require how many second exposures?

3 or 6 seconds

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54

Approximately how much more mAs is required for a wide angle tomogram due to loss of scatter caused by the air gap at the extremes of the tomographic motion?

30% more mAs

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55

What percent change in KVP is required to produce a visible exposure difference in most images?

5%

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56

This is used when localization is necessary because the exact location of a structure is unknown or when a survey is being performed

Narrow angle tomography (exposure amplitudes of less than 10 degrees)

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57

This is used when a lesion has been localized or a specific structure has been determined to require a more detailed examination.

Wide angle tomography

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58

What type of scan does panoramic tomography use?

Slit scan

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59

List other names for panoramic tomography

Pantomography

Orthopantomography

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60

What is the total tomographic arc degree limited to?

48 degrees

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