Deck 8: Dental X-Ray Image Characteristics

Question 1

The typical stepwedge is constructed of

A)aluminum.
B)steel.
C)wood.
D)copper.

Answer 1

aluminum.

Question 2

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

A)film contrast.
B)subject contrast.
C)scale of contrast.
D)kilovoltage peak.

Answer 2

scale of contrast.

Question 3

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

A)increases
B)decreases
C)remains the same
D)is divided by two

Answer 3

increases

Question 4

If the milliamperage is increased,the receptor density ________,and the image appears _________.

A)increases;lighter
B)increases;darker
C)decreases;darker
D)decreases;lighter

Question 5

In order to use the paralleling technique when taking periapical images on your patient,you will need to place the receptor approximately an inch from the teeth.Which of the following will you need to do to decrease image magnification?

A)Increase target-receptor distance.
B)Decrease target-receptor distance.
C)Decrease source to object distance.
D)There is no change in magnification;therefore,no changes need to be made.

Question 6

Radiolucent refers to that portion of a dental image that is

A)black.
B)white.
C)contains the tooth.
D)within the plastic base.

Question 7

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 8

Density is defined as

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

Question 9

You are showing your patient a bite-wing image.Your patient points to a portion of the tooth that is the most radiopaque and wants to know what it is.What portion of the tooth is your patient pointing to?

A)The enamel
B)The pulp
C)The denton
D)The periodontal ligament space

Question 10

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 exposure

Question 11

You have to take retake a dental image on your patient because the image is too light and is undiagnostic.Which of the following could you change to produce an image with increased density?

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

Question 12

Which of the following influencing factors would degrade 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 13

A stepwedge will reveal that images taken at a lower kV will have __________ than images taken at a higher kV.

A)more shades of gray
B)higher contrast
C)lower contrast
D)both A and C

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

The teeth on your patient's images appear very radiopaque and the periodontium and tissue appear very radiolucent.Your patient's dental image has

A)high density.
B)low density.
C)low contrast.
D)high contrast.

Question 16

A stepwedge will reveal that images taken at a higher kV will have _____________ versus images taken at a lower kV.

A)long-scale contrast
B)high contrast
C)only two densities
D)many areas of black and white

Question 17

The geometric characteristic of _____________ refers to an image that appears larger than the actual size of the object it represents.

A)magnification
B)distortion
C)sharpness
D)parallax

Question 18

A dental image 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 19

When a high operating kilovoltage is used,(low/high)subject contrast and (many shades of gray/areas of black and white)are seen on the dental image.

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 20

Which of the following areas would appear the most radiopaque on a dental image?

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

Question 21

You are taking dental images on your patient.You have directed the position indicating device (PID)perpendicular to the tooth and the receptor.Which of the following would you minimize by doing this?

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

Question 22

A longer position-indicating device (PID)results in

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

Question 23

To minimize dimensional distortion,the object and receptor 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