Deck 3: Image Formation

Question 1

When using the bisecting method the object-film distance is kept to a ______________.

Answer 1

minimum

Question 2

All of the following will keep the penumbra as small as possible EXCEPT:

A)small focal spot
B)small OFD
C)angulation of the target
D)decreased FFD

Answer 2

decreased FFD

Question 3

Scatter radiation can be reduced by all of the following methods EXCEPT:

A)open-ended PIDs
B)lead foil inside the film packet
C)kVp settings of 65 and below
D)using as small a beam as possible

Answer 3

kVp settings of 65 and below

Question 4

Long-scale contrast gives the radiograph a (an):

A)black and white appearance
B)gray appearance
C)underpenetrated appearance
D)fogged appearance

Question 5

Identify the correct position of the PID when intraoral radiographs are taken:

A)completely flat against the patient's face
B)almost touching the patient's face
C)within 1 to 2 inches of the patient's face
D)within 3 to 4 inches of the patient's face

Question 6

A radiographic image produced with a kVp setting of approximately 90 will appear as an:

A)image with low-contrast
B)image with long-scale contrast
C)image with many shades of gray
D)all of the above

Question 7

When the position-indicating device (PID)is positioned 2 inches away from the face and all other factors are equal, the resulting film will be:

A)light
B)dark
C)distorted
D)magnified

Question 8

A radiographic image produced with a kVp setting of approximately 65 will appear as an:

A)image with high-contrast
B)image with short-scale contrast
C)image with mostly black and white areas
D)all of the above

Question 9

The pointed cone should _______ be used with the bisecting technique.

Question 10

The most common cause of poor definition in a radiograph is ___________.

Question 11

The degree of blackness on a film in known as:

A)contrast
B)density
C)umbra
D)penumbra

Question 12

The concept that governs the result in question 6 is the:

A)thermionic emission effect
B)HVL factor
C)inverse square law
D)increased object-film distance

Question 13

In order to increase the contrast on a radiograph one should ________ the kVp.

Question 14

All of the following are useful in viewing radiographs EXCEPT:

A)an illuminator
B)ceiling light
C)a magnifying glass
D)a darkened room

Question 15

Penumbra can be described as:

A)definition
B)detail
C)blurring
D)sharpness

Question 16

The most common cause of lack of detail on a radiograph is __________.

Question 17

With regard to the Inverse Square Law, if the focal spot-to-film distance (FFD)doubles, the exposure time should:

A)decrease by
B)decrease by
C)double
D)quadruple

Question 18

Identify the source-to-film distance (FFD)which produces the most amount of image magnification:

A)6 inches
B)10 inches
C)12 inches
D)16 inches

Question 19

The best way to view radiographs is:

A)unmounted
B)on a viewbox
C)using ambient light
D)in the darkroom