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Board Prep > Image Production- image acquisition, and evaluation > Flashcards

Image Production- image acquisition, and evaluation Flashcards

1
Q

What may be the cause of an over exposed image?

A

SID too low

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2
Q

If the KVP is increased 15 percent, how much must the mAs be reduced in order to maintain the same receptor exposure?

A

50 percent

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3
Q

What distance would produce the lease distortion?

A

72 in
The longer the SID, the less size distortion

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4
Q

A non-great exposure requires 15 mAs. How much mAs is needed if a 5:1 ratio grid is used?

A

30 mAs

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5
Q

Which of the following will occur on the tube angle is decreased?

A

Shape distortion will decrease

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6
Q

Special resolution can be improved by reducing which of the following?

A

Focal spot size

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7
Q

If the mA is set at 400 and the mAs obtained is 80, what is the exposure time?

A

0.2 seconds

To calculate time, divide the mAs by the mA

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8
Q

SID should be reduced by 1 inch for every ————— degrees or CR angle?

A

5

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9
Q

How are mA and seconds related to eachother when used to maintain receptor exposure?

A

Inversely proportional

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10
Q

The ratio of SID to SOD represents which of the following?

A

Magnification ratio

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11
Q

What is the greatest advantage of digital imaging?

A

Contrast resolution

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12
Q

What is the best method to reduce scatter radiation which causes fog?

A

Collimation

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13
Q

Spatial resolution can be improved by?

A

Maximum SID

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14
Q

What is an advantage of the air gap technique?

A

Eliminates the need for a grid

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15
Q

How will be in filtration affect the primary beam?

A

Make it more homogeneous

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16
Q

If the S ID is increase the same as the OID, what will the resultant radiograph show?

A

An increase in size distortion

Magnification formula SID/SOD

17
Q

How much mAs will be generated if the control panel is set at 200 mA and 1/5 second?

A

40 mAs

mAs= 200 mA x 1/5 second

18
Q

Geometric and sharpness is directly proportional to which of the following?

A

OID

19
Q

Time can be decreased by half if the KVP is increased by what percentage?

A

15%

20
Q

What condition would be considered easy to penetrate?

A

Degenerative arthritis

21
Q

What are the two types of distortion that can reduce the quality of a radiograph?

A

Size and shape

22
Q

Density was the term used to describe the overall blackening of a film screen radiograph. What term is used in digital imaging to describe this radiographic quality?

A

Receptor exposure

23
Q

Wavy pattern that results when to geometrically parallel lines are super impose is referred to as what?

A

Moire effect

24
Q

What is the correct name for loss of sharpness due to the use of a large focal spot?

A

Unsharpness

25
Q

Which of the following technique adjustment should be made on radio graphing a geriatric patient with osteoporosis?

A

Decrease kvp

(Osteoporosis is easy to penetrate)

26
Q

Because of the anode Hill affect where is the intensity of the x-ray being the greatest?

A

At the cathode end

27
Q

Which of the following would be used to minimize size distortion?

A

Shortest Possible OID
Longest SID

28
Q

And underexpose radiograph may because by what?

A

Grid cutoff

29
Q

When using AEC, which method can be used to control motion by reducing exposure time?

A

Increase mA

30
Q

Which of the following is not one of the three elements that affect shape distortion?

A

SID

(SID effects size distortion not shape)

31
Q

What condition would be considered hard to penetrate

A

Osteosclerosis

32
Q

If a technique of 300 mA, 1/10 second and 60 kVp is to be changed to 69 kVp what would the new time be?

A

1/20 second

(Cut time in half to compensate for 15% increase in kvp)

33
Q

Spatial resolution is not affected by which of the following?

A

kVp

34
Q

Which of the following radiographic qualities determines the sharpness of detail in the finish radiograph?

A

Spatial resolution and distortion

35
Q

A flat panel detectors DEL size determines what of the following?

A

Spatial resolution

Board Prep (8 decks)

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