Deck 8: Dental X-Ray Image Characteristics

Question 1

If the milliamperage is increased, the film density ____, and the film appears ____.

A) Increases; lighter
B) Increases; darker
C) Decreases; darker
D) Decreases; lighter

Answer 1

Increases; darker

Question 2

Radiopaque refers to that portion of a processed radiograph that is:

A) Black.
B) White.
C) Gray.
D) Within the plastic base.

Answer 2

White.

Question 3

Radiolucent refers to that portion of a processed radiograph that is:

A) Black.
B) White.
C) Gray.
D) Coated with an emulsion.

Answer 3

Black.

Question 4

Radiographic density is defined as:

A) A radiopaque radiograph.
B) A radiolucent radiograph.
C) The overall blackness or darkness of a radiograph.
D) The difference in degrees of blackness between adjacent areas on a dental radiograph.

Question 5

A stepwedge will reveal that radiographs taken at a lower kVp will have ____ than radiographs taken at a higher kVp.

A) More shades of gray
B) Higher contrast
C) Lower contrast
D) Both a and c

Question 6

When a high operating kilovoltage peak (>90 kVp) is used, (low/high) subject contrast and (many shades of gray/areas of black and white) are seen on the radiograph.

A) Low subject contrast; many shades of gray
B) Low subject contrast; areas of black and white
C) High subject contrast; many shades of gray
D) High subject contrast; areas of black and white

Question 7

Which of the following areas would appear the most radiolucent on a dental radiograph?

A) Composite
B) Amalgam
C) Air space
D) Enamel

Question 8

Which of the following factors would improve image sharpness?

A) Larger focal spot
B) Larger crystal size in the film
C) Smaller crystal size in the film
D) Patient movement during x-ray film exposure

Question 9

Which of the following choices would result in increased magnification of the radiographic image?

A) Increased target-film distance
B) Decreased object-film distance
C) Increased object-film distance
D) Both a and b

Question 10

If the operating kilovoltage is increased, the film density ____ because the average energy of the x-rays is raised.

A) Increases
B) Decreases
C) Remains the same
D) Is divided by two

Question 11

The typical stepwedge is constructed of:

A) Aluminum.
B) Steel.
C) Wood.
D) Copper.

Question 12

Which of the following changes will result in a radiograph with reduced density?

A) Increasing the exposure time
B) Increasing the subject thickness
C) Increasing the milliamperage
D) Increasing the operating kilovoltage peak

Question 13

A radiograph that has ____ is said to have low contrast.

A) A very dark overall appearance
B) A very light overall appearance
C) Many shades of gray
D) Very dark areas and very light areas

Question 14

An increase in ____ temperature will result in a film with increased contrast.

A) Development
B) Water bath
C) Fixer
D) Room

Question 15

A stepwedge will reveal that radiographs taken at a higher kVp will have ____ versus radiographs taken at a lower kVp.

A) Long-scale contrast
B) High contrast
C) Only two densities
D) Many areas of black and white

Question 16

Which of the following influencing factors would degrade film sharpness?
(1) Smaller silver halide crystal size
(2) Larger silver halide crystal size
(3) Smaller focal spot
(4) Larger focal spot

A) 1 and 3
B) 1 and 4
C) 2 and 3
D) 2 and 4

Question 17

The range of useful densities seen on a dental radiograph is termed the:

A) Film contrast.
B) Subject contrast.
C) Scale of contrast.
D) Kilovoltage peak.

Question 18

The primary factor that limits the size of the tungsten target is:

A) The cost of the materials.
B) Heat production.
C) The limited kinetic energy of the electrons.
D) The limited kinetic energy of the photons.

Question 19

The geometric characteristic of ____ refers to the capability of the x-ray film to reproduce the distinct outlines of an object.

A) Magnification
B) Distortion
C) Sharpness
D) Parallax

Question 20

A radiograph that has ____ is said to have high contrast.

A) A very dark overall appearance
B) A very light overall appearance
C) Many shades of gray
D) Very dark areas and very light areas

Question 21

The x-ray beam must be perpendicular to the tooth and film in order to minimize:

A) Sharpness.
B) Grain size.
C) Focal spot size.
D) Dimensional distortion.

Question 22

To minimize dimensional distortion, the object and film must be ____ one another.

A) Perpendicular to
B) Parallel to
C) At a 45-degree angle to
D) More than the length of the PID apart from

Question 23

A longer position-indicating device (PID) results in:

A) An increased target-film distance.
B) A more divergent x-ray beam.
C) More image magnification than when a shorter PID is used.
D) An increased object-film distance.