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45 Cards in this Set

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Activating the rotor will:
Reduce tube life
X-rays are produced as incident electrons interact with target atoms by a process called:
Bremsstrahlung
Heat is produced in the x-ray tube as:
Electrons interact with the target material
When a spinning top test is performed on three-phase equipment, a timer setting of 1/60 second should indicate the following on the resultant radiograph:
A 6-degree arc
Programs that deal with the safe and reliable operation of equipment and those that address all aspects of the delivery of radiology services are called, respectively:
Quality control and quality assurance
Examples of dedicated x-ray equipment include:
Mammography units
Tomography units
Mobile x-ray machines
The primary purpose of filtration is:
Radiation protection
Resolution of the television system may be measured using the following tool(s):
Resolution test pattern
The portion of the image-intensifier ube that converts visible light to an electronic image is the:
Photocathode
Which of the following statements regarding filtration is true?
Total filtration (not less than 2.5-mm aluminum equivalent) \= inherent filtration (glass, envelope, tube housing, oil) + added filtration (aluminum)
Marks on the focal track of the anode resulting from bombardment of electrons are called:
Pitting
When making an exposure, the radiographer should:
Activate the rotor and exposure switch in one continuous motion
The test that measures the accuracy of successive exposure is:
Exposure reproducibility
Which of the following charts may be consulted to determine the safety of a series of x-ray exposures?
Anode cooling curve
Exposure linearity must be accurate to within:
10%
Effective focal-spot size may be measured using the following tool(s):
Slit camera
Star test pattern
Pinhole camera
All of the above
The x-ray beam is:
Heterogeneous or polyenergetic, consisting of many different energies (wavelengths)
X-rays are produced as incident electrons interact with inner shell electrons in target atoms by a process called:
Characteristic
The amount of mA used for fluoroscopy is:
3 to 5
kVp must be accurate to within:
+ or - 5 kVp maximum
The x-ray emission spectrum consists of:
Discrete spectrum (produced by characteristic rays) and continuous spectrum (produced by brems rays)
The increase in average photon energy when using three-phase, 12-pulse equipment compared with single-phase equipment is:
41%
Effective quality control and quality assurance programs are required for accreditation by:
The Joint Commission
What percentage of energy in the x-ray tube is converted to x-rays?
1%
The collimator must be accurate to a level of:
2% of SID
The portion of the image-intensifier tube that converts electron energy to visible light is the:
Output phosphor
The electron stream passes from cathode to anode because of _____ passing through the x-ray tube.
Current
The process of thermionic emission causes:
Electrons to boil off the filament
The amount of material needed to reduce the intensity of the beam by 1/10 is called:
Tenth-value layer
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 is located between the patient and the image receptor?
Ionization chamber
The filament is kept warm by:
A standby current from the time the x-ray machine is turned on
Most of the energy conversion in the x-ray tube produces:
Heat
Three-phase, Twelve-pulse full-wave rectification produces:
Direct current with 4% ripple
The test that measures the accuracy of adjacent mA stations is:
Exposure linearity
Single-phase, full-wave rectification produces:
Pulsating direct current with 120 pulses per second and 100% ripple
Exposure reproducibility must be accurate to within:
5%
Automatic exposure controls may be tested using:
Phantoms
Total brightness gain achieved using an image intensifier equals:
Flux gain times minification gain
When a spinning top test is performed on single-phase equipment, a radiograph exhibiting four dots would indicate:
A malfunctioning timer, if set on 1/3 second
An accurate timer, if set on 1/30 second
The input phosphor of the image-intensifier tube converts:
X-ray energy to visible light
Calculating heat units for three-phase, twelve-pulse equipment 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
Three-phase, six-pulse full-wave rectification produces:
Direct current with 13% ripple
The increase in average photon energy when using three-phase, six-pulse equipment compared with single-phase equipment is:
35%
WHEN AN IMAGE APPEARS WITH SUFFICIENT DENSITY IN THE CENTER OF THE IMAGE AND INSUFFICIENT DENSITY AT THE PERIMETER, POSSIBLE CAUSES COULD BE:
1) AN UPSIDE DOWN GRID

2) INSUFFICIENT SID WITH A FOCUSED GRID