Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
45 Cards in this Set
- Front
- Back
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 |