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Radiology > Recording The Image > Flashcards

Recording The Image Flashcards

0
Q

How do the digital electrical signals work?

A

They are used to create pixels that form a visible radiographic image on the monitor

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1
Q

What do digital image receptors do?

A

Convert an analog signal into a digital electrical signal

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2
Q

True or false: digital image receptors may resemble and be used in the same manner as a conventional x Ray film cassette

A

True

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3
Q

What are three advantages of digital image receptors over conventional x Ray film?

A

Eliminates the need of X-ray film processing
Better images that are made faster
Images can be manipulated

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4
Q

Can CR systems be used for horizontal and vertical film images?

A

Yes

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5
Q

What are four controllable components of the X-ray?

A

Milliamperes he
Exposeur time
Kilovolt age peak
Focal film distance

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6
Q

What is milliamperage?

A

Measure of the electrical current that is used to heat the wire filament at the cathode

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7
Q

The temperature of the filament is directly related to what?

A

The # of electrons that freed from their orbits to travel to the anode

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8
Q

What is exposeur time?

A

Controls the period of time during which X-rays are actually produced in the X-ray tube

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9
Q

What is exposeur time equivalent to?

A

The amount of X-rays produced

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10
Q

What controls the number of X-rays produced?

A

mA and exposeur time

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11
Q

How can you reach mA-s requirements?

A

By adjusting mA and exposeur time

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12
Q

300mA x 1/60s= what?

A

5ma s

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13
Q

What is kilovolt age peak?

A

Measure of electrical potential difference between the cathode and anode

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14
Q

X-rays of higher energy can do what?

A

Have greater potential to penetrate through tissue

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15
Q

What is the focal I’ll distance

A

The distance between the focal spot in the x Ray tube and the X-ray film

16
Q

What does the focal film distance effect?

A

The number of Rays that reach the film during a radio graphic exposure

17
Q

What is the inverse square law?

A

The intensity of the beam is reduced by 1/4th when you double the distance from the source

18
Q

The visual quality of a radiograph image is assessed by what?

A

Density
Contrast
Detail
Distortion

19
Q

What is density?

A

The degree of blackness on a film

20
Q

What does density depend on?

A

The number of X-rays reaching the film

21
Q

What will the number of X-rays do to density?

A

The more x Rays to reach the film, the greater the blackness and the greater the density

22
Q

How does mA s affect density?

A

Determines the # of x Rays produced

23
Q

How does kVp effect density?

A

Determined penetrating power of X-rays

24
Q

How does FFD effect density?

A

The farther the film from the tube the fewer X-rays that will hit which will cause lower density

25
Q

How can film processing and patient factors effect density? 4

A

Developing time
Developing temperature
Tissue thickness
Tissue density

26
Q

What is radio graphic contrast?

A

Visible difference between two adjacent structures on a film

27
Q

What will high contrast look like?

A

Lots of Black and white little grey

28
Q

What is low contrast?

A

Lots of grey, little black and whit

29
Q

How can kVp effect contrast?

A

Variations and penetrating power can create more or fewer shades of gray

30
Q

What can effect contrast?

A

Differences in tissue thickness/density and scatter radiation

31
Q

What is radio graphic detail?

A

Image sharpness, clarity

32
Q

What are four factors that effect radio graphical detail?

A

Focal spot size, FFD, animal motion, screen film contact

33
Q

What are three ways to prevent radio graphic distortion?

A

Positioning subject as close to the cassette as possible
Positioning point of interest in the center of the x ray beam
Positioning subject parallel to cassette

34
Q

What is the radio graphic image lattitude?

A

The exposeur factor setting range over which radio graphic images of adequate radio graphic density will be produced

35
Q

Why does X-ray film require settings to be exact?

A

Because of its narrow lattitude

36
Q

Why do digital x Rays not need I be as exact?

A

Because digital takes x rays over a wide range of exposure settings

37
Q

Why can digital produce more shades of grey?

A

Because of its wide latitude

Radiology (8 decks)

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