Finals

Question 1

The production of x-ray photons by the sudden deceleration of high-speed electrons is termed:

Answer 1

Bremsstrahlung

Question 2

The automatic exposure device that is located immediately under the x-ray table is the

Answer 2

Ionization chamber

Question 3

Which of the following may be sued to express exposure in air?
1. Air kerma
2. Gy
3.Sv
4. RBE

Answer 3

Air kerma

Question 4

A PA skull will reduce the dose to the

Answer 4

Eyes

Question 5

If 300 mA has been selected for a particular exposure, what exposure time would be required to produce 6 mAs?

Answer 5

20 ms

Question 6

Types of gonadal shielding include which of the following?
1. Flat Contact
2. Shaped contrast (contour)
3. Shadow

Answer 6

1,2, and 3

Question 7

For radiographic examinations of the chest, it is generally preferred that the chest be examined in the PA projection to decrease dose to

Answer 7

Breast

Question 8

Which of the following would be useful for an examination of a patient suffering from Parkinson’s disease?
1. Short exposure time
2. Decreases SID
3. Compensating filtration

Answer 8

1 only

Question 9

Which of the following contributes most to the patient dose?
1. Photoelectric effect
2. Compton scatter
3. Classic scatter
4. Thompson scatter

Answer 9

1

Question 10

The primary function of filtration is to reduce

Answer 10

Patient skin dose

Question 11

How many tube target interactions are there in x-ray production?

Answer 11

2

Question 12

The occupational dose to radiographers is measured in

Answer 12

Sv

Question 13

Lead aprons are worn during fluoroscopy to protect the radiographer from exposure to radiation from

Answer 13

Compton scatter

Question 14

For radiographic examinations of the skull, it is generally preferred that the skull be examined in the

Answer 14

PA projection

Question 15

The type of radiation monitoring device that uses aluminum oxide as the detection material is

Answer 15

OSL

Question 16

How is the ESE affected as the source-to-skin-distance (SSD) is increased?

Answer 16

ESE Decreases

Question 17

What minimum total amount of filtration (inherent plus added) is required in x-ray equipment operated above 70 kVp?

Answer 17

2.5 mm Al equivalent

Question 18

How are wavelength and energy related?

Answer 18

Inversely

Question 19

The intensity of the beam has what relationship with distance?

Answer 19

Direct

Question 20

Filters used in radiographic x-ray tubes generally are composed of

Answer 20

Aluminum

Question 21

With milliamperes (mA) increased to maintain output intensity, how is the ESE affected as the source-to-skin-distance (SSD) is increased?

Answer 21

ESE Decreases

Question 22

The exposure received at the skin entrance to a patient’s body is known as

Answer 22

Entrance skin exposure (ESE )

Question 23

Aluminum filtration has its greatest effect on

Answer 23

Low energy X-ray photons

Question 24

A significant reduction in patient dose can be achieved by

Answer 24

Increasing kVp/decreasing mAs

Question 25

Because of the anode heel effect, the intensity of the x-ray beam is greatest at the

Answer 25

Cathode end

Question 26

The advantages of beam restriction include which of the following?
1, Less scattered radiation is produced
2. Less biologic material is irradiated
3. Less total filtration will be necessary

Answer 26

1 and 2

Question 27

Filtration will _____the ESE.

Answer 27

Decrease

Question 28

When mAs is increased, patient dose will

Answer 28

Increase

Question 29

If a conscientious radiographer chooses the appropriate exposure/technical factors dose can be reduced by at least

Answer 29

50%

Question 30

Some patients, such as infants and children, are unable to maintain the necessary radiographic position without assistance. If mechanical restraining devices cannot be used, who of the following should be the first choice to help immobilize the patient?

Answer 30

Patients father

Question 31

The principle factors affecting scatter production are

Answer 31

Kv
Subject density

Question 32

The most commonly employed beam restrictor in radiography is the

Answer 32

Collimator

Question 33

Which x-ray interaction is scatter produced in?

Answer 33

Compton scattering

Question 34

Which x-ray interactions are predominantly seen in the diagnostic x-ray range?

Answer 34

Photoelectric absorption
Compton scattering

Question 35

The amount of kV should be selected based on the size of the

Answer 35

Part being examined