PART 1 Flashcards
What is the function of the x-ray imaging system?
To provide a controlled flow of electrons intense enough to produce an x-ray beam appropriate for imaging.
What are the three main components of an x-ray imaging system?
- Operating console
- High-voltage generator
- X-ray tube
What is the purpose of the operating console in an x-ray imaging system?
Allows radiologic technologists to control the x-ray tube current and voltage.
What type of x-ray imaging system is used for dermatology?
Grenz Ray (10 – 20 kVp)
What is the approximate kVp for a diagnostic x-ray?
30 – 150 kVp
Fill in the blank: The x-ray imaging system converts electrical energy into _______.
electromagnetic energy
What is the primary material used for carbon fiber couches in x-ray imaging?
Carbon fiber
What does mAs stand for in radiation quantity?
Milliampere-second
What does kVp stand for in radiation quality?
Kilovolt peak
List the factors affecting x-ray quantity.
- mAs
- kVp
- Distance
- Filtration
List the factors affecting x-ray quality.
- kVp
- Filtration
True or False: The operating console is at high voltage to minimize the possibility of hazardous shock.
False
What is the purpose of the autotransformer in an x-ray imaging system?
To supply a precise voltage to the filament circuit and to the high-voltage circuit.
What is the function of the line compensator?
Measures and adjusts the voltage provided to the x-ray imaging system to precisely 220 V.
What does thermionic emission refer to?
The release of electrons from a heated filament.
What are the two primary components of the cathode in the x-ray tube?
- Filament
- Focusing Cup
What is the purpose of the focusing cup in the x-ray tube?
To direct the electrons toward the anode.
What is the minimum exposure time possible with a synchronous timer?
1/60 s (17 ms)
What does AEC stand for in x-ray imaging?
Automatic Exposure Control
What type of transformer is the high-voltage transformer?
Step-up transformer
Define half-wave rectification.
A condition in which the voltage is not allowed to swing negatively during the negative half of its cycle.
What is the purpose of voltage rectification?
To ensure that flow from x-ray tube cathode to anode only occurs in one direction.
What are the three types of rectification?
- Unrectified voltage
- Half-wave rectification
- Full-wave rectification
Fill in the blank: The x-ray tube current is measured in _______.
milliampere (mA)
What is the primary material used for the filament in the x-ray tube?
Tungsten
What does the kVp meter allow the technologist to do?
Monitor voltage before an exposure.
What is the function of the Bucky tray?
To hold a cassette and grid under the examination table.
List the four types of exposure timers.
- Synchronous timer
- Electronic timer
- mAs timer
- Automatic Exposure Control (AEC)
What is the purpose of shielding in radiation protection?
To reduce radiation exposure.
What does the acronym STAND for in radiation protection?
- S – Shielding
- T – Time
- D – Distance
