X-Ray Equipment Operation - Image Production Flashcards
At what speed do x-rays travel?
The speed of light – 186,000 miles per second
The speed of x-rays is based on:
The fact that they form electromagnetic radiation
As radiation strikes matter, how is energy transferred to the atoms?
According to the law of conversion of energy
Electromagnetic induction is the process of causing an electrical current to flow in a conductor:
When it is placed in the magnetic field of another conductor
The strength of the magnetic fields in a transformer is increased by:
Coiling the wires and letting their magnetic fields overlap
The electricity provided to the radiology department is:
60 Hz AC
The electricity provided to the radiology department operates at:
120 pulses per second
The primary advantage of three-phase power is that:
Voltage never drops to zero
A variable transformer that is used to select kVp for the x-ray circuit is the:
Autotransformer
What regulates the duration of x-ray production?
Timer
What is the source of bremsstrahlung and characteristic rays?
Anode
What is the most commonly used AEC?
Ionization chamber
What device always delivers the shortest exposure time possible?
Falling load generator
What device is turned by a rotor?
Anode
The filament is kept warm by:
A standby current from the time the x-ray machine is turned on.
X-rays are produced as incident electrons are slowed going past the nuclei of target atoms by a process called:
Bremsstrahlung
X-rays are produced as incident electrons collide with inner shell electrons in target atoms by a process called:
Characteristic
What are the properties of x-ray?
- Affect film emulsion
- Scatter and produce secondary radiation
- Invisible to the human eye
- Travels in bundles of energy called photons
- Can ionize matter and gases
- Cause phosphors to fluoresce
The x-ray emission spectrum consists of:
Discrete spectrum (produced by characteristic rays) and continuous spectrum (produced by brems rays)
The primary purpose of filtration is:
Radiation protection
The amount of material needed to reduce the intensity of the beam by 1/10 is called:
Tenth-Value Layer
When a quality control test is performed to ensure that the penetrating ability of the x-ray beam is accurate, the result must be within what amount of the control panel setting?
50%
The primary type of grid used in diagnostic imaging is:
Focused
The portion of the image-intensifier tube that converts electron energy to visible light is the:
Output Phosphor
