Deck 6: Patient Protection

Question 1

Using E-speed film (instead of D-speed film)reduces the radiation exposure to the patient by approximately:

A)25%.
B)50%.
C)75%.
D)nearly 100%.

Answer 1

50%.

Question 2

Scatter radiation is a form of:

A)useful beam.
B)primary radiation.
C)secondary radiation.
D)None are correct

Answer 2

useful beam.

Question 3

When using rectangular collimation with the paralleling technique,one must use a (an):

A)bite tab.
B)8-inch FFD.
C)bisecting device.
D)localizing film-holding device.

Answer 3

localizing film-holding device.

Question 4

To get the diagnostic benefits from radiographs,optimum film viewing requirements include all of the following EXCEPT one.Which one is the EXCEPTION?

A)A darkened room
B)Use of a film mount
C)Lamp on dental unit
D)Use of an illuminating device

Question 5

All of the following are recommended selection criteria for radiographic exposure EXCEPT one,which one is the EXCEPTION?

A)Dental history
B)Medical history
C)Caries risk assessment
D)Nutritional assessment
E)Thorough clinical examination

Question 6

Open-ended,lead-lined (shielded)rectangles or cylinders,and closed-end,pointed cones are the only types of position-indicating devices (PIDs)that should be used.

Question 7

Film speed and focal-film distance (FFD)determine the contribution of mAs to the patient's radiation exposure.However,the choice of kV affects the contrast of the film and radiation dose.

A)Both statements are true.
B)Both statements are false.
C)First statement is true,second is false.
D)First statement is false,second is true.

Question 8

Identify the radiographic technique that provides less radiation exposure to the thyroid gland and eyes:

A)occlusal technique.
B)bite block technique.
C)paralleling technique.
D)bisecting angle technique.

Question 9

The removal of the long wavelength,low energy x-ray photons from the beam is the job of the:

A)filters.
B)collimator.
C)insulating oil.
D)open-ended cone.

Question 10

All of the following can be produced by tube-head drift EXCEPT one.Which one is the EXCEPTION?

A)Blurred image
B)Cone-cut image
C)Darkened image
D)Distorted image

Question 11

What does ALARA stand for?

A)As low as reasonably assessed
B)As little as reasonably affected
C)As long as reasonably achieved
D)As low as reasonably achievable

Question 12

The use of pointed PIDs is prohibited because their use results in:

A)cone cutting.
B)increased scatter radiation.
C)increased primary radiation.
D)greater likelihood of overlapping images.

Question 13

Which of the following results in the greatest reduction of radiation to the patient?

A)Low kVp
B)High mA
C)Short developing time
D)Rectangular collimation

Question 14

When compared to the use of D-speed film digital imaging can reduce the patient's radiation exposure by up to what percent?

A)25%
B)50%
C)80%
D)90%

Question 15

Why is an increased target-receptor distance (FFDs)of up to 16 inches recommended with the paralleling technique?

A)To decrease patient movement
B)To decrease the patient's skin exposure
C)To reduce the possibility of collimator cutoff
D)To compensate for the magnification of the image

Question 16

The collimator limits the size and shape of the x-ray beam to no more than:

A)inches at the skin.
B)Inches at the skin.
C)inches at the skin.
D)Inches at the skin.

Question 17

Tube-head leakage is the radiation that escapes through the protective shielding of the x-ray tube head.

Question 18

The primary radiation is collimated by the aluminum filters.

Question 19

Administrative radiographs are taken to confirm that procedures have been completed.

Question 20

Mechanical timers are usually inaccurate by at least a quarter second.