A photostimulable phosphor is the active component of what piece of quipment?
Computed radiography imaging plate
In computed radiography, the image must be turned into digital form by what device?
Direct digital radiography differs from computed radiography in what way?
The use of fixed detectors that communicate directly with the computer
A graphic display that is constructed to show the radiographer the distribution of pixel values is called:
The law stating that the oouter shell of an atom can contain no more than eight electrons is called:
The intensity of radiation is inversely proportional to the square of the distance between the source of radiation and the person receiving it . This descibes:
Inverse square law
As radiation strkes matter:
The energy is transferred to the atoms according to the law of conservation of energy
Which of the statements are true regarding electrostatic charges?
1) Electrostatics is the study of electirc chares at rest
4) Electrostatic charges concentrate on a conductor in the area of greatest curvature
Which of the statements are false regarding Equipment Operation?
4) The volt is the unit of electric curretn
6) The ampere is the unit of electromotive force
9) Ohm's law is calculated unsing the quation VI=R
Electromagnetic induction is the process of causing an electric 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 vires and letting their magnetic fields overlap
A transformer that has more turns in the secondary than in the prmary coild is called a:
Voltage coming to the x-ray machine is kept constant through the use of a(n):
Line voltage compensator
What device reduces voltage and provides current to produce an electron cloud or space charge at the filament?
What is located in the x-ray circuit between the high-voltage tranformer and the x-ray tube?
When making an exposure, the radiographer should:
Activate the rotor and exposure switch in one continuous motion
The electron stream passes from cathode to anode because of ______ passing through the x-ray tube.
X-rays are produced as incident electrons interact with target atoms by a process called:
X-rays are produced as incident electrons interact with inner shell electrons in target atoms by a process called:
What are properties of x-rays?
2) Affect film emulsion
3) scatter and produced secondary radiation
7) Travel in bundles called photons
8) Ionize matter and gases
10) cause phosphors to fluoresce
The x-ray beam is:
Hetergeneous or polyenergetic, consisting of many different energies (wavelengths)
The x-ray emission spectrum consists of:
Discrete spectrum (produced by characteristic rays) and continuous spectrum (produced by brems rays)
The amount of material needed to reduce the intensity of the beam by 1/10 is called:
What statements are true regarding filtration?
Total filtration (not less that 2.5-mm aluminum equivalent) = inherent filtration (glass envelope, tube housing, oil) + added filtration (aluminum)
Calculating heat untties for three-phase, twelve-pulse quipment requires the use of ____ as a constant; calculating heat units for single-phase equipment requires the use of _____ as a constant; calculating heat units for three-phase, six-pulse equipment requires the use of _____ as a constant.
1.41, 1, 1.35 because average photon energy is different with each type of equipment
Which of the following charts may be consulted to determine the safety of a single x-ray exposure?
Tube rating chart
Which of the following charts may be consulted to determine the safety of a series of x-ray exposure?
Anode cooling curve
The portion of the image intensifire tube that converts elctron energy to visible light is the :
Single-phase, full-wave rectification produces:
Pulsating direct current with 120 pulses per sec and 100%
The increase in average photon evergy when using three-phase, six-pulse equipment compared with single-phase equipment is:
The increase in average photon energy when using three-phase, 12-ulse quipment compared with single-phase equipment is:
Programs that deal with the safe and reliable operation of equipment and those that adress all aspects of the delivery of radiology services are called, respectively:
Quality control and qulity assurace
When a spinning top test is performed on single-phase equipment , a radiograph exhibting four dots would indicate:
An accurate timer, if set on 1/30 second
When a spinning top test is performed on three-phase equipment, a timer setting of 1/60 sencond should indicate the following on the resultant radiograph:
a 6-degree arc
Effective focal-spot size may be measured using the followin tools
slit camera, star test pattern, pinholde camera
Resolution of the television system by be measured ising the following tools
resolution test pattern