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Slockett's Rad Exposures > Ch 10 Radiographic Quality II > Flashcards

Ch 10 Radiographic Quality II Flashcards

1
Q

What is film speed affected by?

A
  • Immersion time
  • Temperature
  • Chemical activity
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2
Q

The longer the film stays in the chemical bath, the _______ the line becomes.

A

Straighter

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3
Q

If you increase your speed, what happens to your mAs?

A

It goes down

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4
Q

Speed and mAs are _______ proportional.

A

Inversely

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5
Q

A wide latitude, would have ____ shades of gray.

A

Many

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6
Q

A narrow latitude, would have a ______ scale of contrast

A

Short

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7
Q

Latitude and contrast are _______ proportional.

A

Inversely

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8
Q

What is Latitude?

A

Range of exposures that will produce densities within the diagnostic range

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9
Q

What is the formula for Latitude?

A

Latitude= E h - E I

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10
Q

E h=

A

High exposure point OD 2.50

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11
Q

E l=

A

Low exposure point OD 0.25

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12
Q

A narrow latitude film requires ______ exposure accuracy and produces short gray scales.

A

Greater

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13
Q

The _______ amount of magnification should be maintained.

A

Smallest

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14
Q

What is the ratio of image size to object size?

A

Magnification

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15
Q

Some magnification will _____ exist.
40”-?
72”-?

A

Always
40”- 1.1
72”- 1.05

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16
Q

What is SOD?

A

Source to object distance

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17
Q

What is OID?

A

Object to image distance

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18
Q

What is the acceptable magnification range?

A

?

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19
Q

How many cm are in an inch?

A

2.5

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20
Q

What are the (2) factors that effect image magnification?

A
  1. SID

2. OID

21
Q

What is distortion?

A

Unequal magnification of different portions of the same object

22
Q

Distortion is dependent on…

A
  • Thickness of object/ part
  • Position
  • Shape of the object
23
Q

The thicker the object the _____ distortion present on the final radiograph.

A

More

24
Q

We must compensate for object unsharpness with factors we can control, such as:

A
  • Focal spot size
  • SID
  • OID
25
Q

Fine detail=

A

Small focal spot

26
Q

Smaller x-ray beam width will produce a _____ image.

A

Sharper

27
Q

General radiology uses _____ focal spot

A

Large

28
Q

The larger the focal spot the more ____ you get.

A

Penumbra

29
Q

What is Penumbra?

A

Fuzzy border that appears outside the image

30
Q

The greater the distance between tube and the cassette, the greater the image…

A

Sharpness

31
Q

To reduce penumbra, use the _____ amount of SID.

A

Maximum

32
Q

The closer the object to the film, the _____ the detail.

A

Sharper

33
Q

When OID goes down, penumbra goes down and sharpness goes ____.

A

Up

34
Q

When OID goes up, penumbra goes up and sharpness goes ____.

A

Down

35
Q

Penumbra and Sharpness are _______ relational.

A

Inversely

36
Q

Objects not on the central axis appear ______.

A

Distorted

37
Q

If the object plane and the image plane are not parallel, image _______ will appear.

A

Distortion

38
Q

What is Foreshortening?

A

Image size is reduced as the angle on inclination along the central axis increases

39
Q

What is elongation?

A

The image size is lengthened as the inclination is increased

40
Q

What is shape distortion?

A

The misrepresentation by unequal magnification of the actual shape of the structure being examined

41
Q

The farther away the part of interest is from the CR of the image receptor, the greater the ______.

A

Distortion

42
Q

What is focal spot blur?

A

Focal spot is not a point, but rather a rectangular source (0.1- 1.5mm)

43
Q

What is the most important factor in determining resolution?

A

Focal spot blur

44
Q

What is focal spot blur caused by?

A
  • Large effective focal spot
  • Short SID
  • Long OID
45
Q

What side of the tube is focal spot blur the greatest?

A

The cathode side

46
Q

How do you minimize focal spot blur?

A
  • Use small focal spots
  • Decrease OID
  • Increase SID
47
Q

The difference between SID and OID =

A

SOD

48
Q

Can you control subject factors?

A

No

Slockett's Rad Exposures (8 decks)

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