PART 1

Question 1

What is the function of the x-ray imaging system?

Answer 1

To provide a controlled flow of electrons intense enough to produce an x-ray beam appropriate for imaging.

Question 2

What are the three main components of an x-ray imaging system?

Answer 2

• Operating console
• High-voltage generator
• X-ray tube

Question 3

What is the purpose of the operating console in an x-ray imaging system?

Answer 3

Allows radiologic technologists to control the x-ray tube current and voltage.

Question 4

What type of x-ray imaging system is used for dermatology?

Answer 4

Grenz Ray (10 – 20 kVp)

Question 5

What is the approximate kVp for a diagnostic x-ray?

Answer 5

30 – 150 kVp

Question 6

Fill in the blank: The x-ray imaging system converts electrical energy into _______.

Answer 6

electromagnetic energy

Question 7

What is the primary material used for carbon fiber couches in x-ray imaging?

Answer 7

Carbon fiber

Question 8

What does mAs stand for in radiation quantity?

Answer 8

Milliampere-second

Question 9

What does kVp stand for in radiation quality?

Answer 9

Kilovolt peak

Question 10

List the factors affecting x-ray quantity.

Answer 10

• mAs
• kVp
• Distance
• Filtration

Question 11

List the factors affecting x-ray quality.

Answer 11

• kVp
• Filtration

Question 12

True or False: The operating console is at high voltage to minimize the possibility of hazardous shock.

Answer 12

False

Question 13

What is the purpose of the autotransformer in an x-ray imaging system?

Answer 13

To supply a precise voltage to the filament circuit and to the high-voltage circuit.

Question 14

What is the function of the line compensator?

Answer 14

Measures and adjusts the voltage provided to the x-ray imaging system to precisely 220 V.

Question 15

What does thermionic emission refer to?

Answer 15

The release of electrons from a heated filament.

Question 16

What are the two primary components of the cathode in the x-ray tube?

Answer 16

• Filament
• Focusing Cup

Question 17

What is the purpose of the focusing cup in the x-ray tube?

Answer 17

To direct the electrons toward the anode.

Question 18

What is the minimum exposure time possible with a synchronous timer?

Answer 18

1/60 s (17 ms)

Question 19

What does AEC stand for in x-ray imaging?

Answer 19

Automatic Exposure Control

Question 20

What type of transformer is the high-voltage transformer?

Answer 20

Step-up transformer

Question 21

Define half-wave rectification.

Answer 21

A condition in which the voltage is not allowed to swing negatively during the negative half of its cycle.

Question 22

What is the purpose of voltage rectification?

Answer 22

To ensure that flow from x-ray tube cathode to anode only occurs in one direction.

Question 23

What are the three types of rectification?

Answer 23

• Unrectified voltage
• Half-wave rectification
• Full-wave rectification

Question 24

Fill in the blank: The x-ray tube current is measured in _______.

Answer 24

milliampere (mA)

Question 25

What is the primary material used for the filament in the x-ray tube?

Answer 25

Tungsten

Question 26

What does the kVp meter allow the technologist to do?

Answer 26

Monitor voltage before an exposure.

Question 27

What is the function of the Bucky tray?

Answer 27

To hold a cassette and grid under the examination table.

Question 28

List the four types of exposure timers.

Answer 28

• Synchronous timer
• Electronic timer
• mAs timer
• Automatic Exposure Control (AEC)

Question 29

What is the purpose of shielding in radiation protection?

Answer 29

To reduce radiation exposure.

Question 30

What does the acronym STAND for in radiation protection?

Answer 30

• S – Shielding
• T – Time
• D – Distance