Registry part 5
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what is tissue weighting factor
represents the relative tissue radiosensitivity of irradiated material
what is radiation weighting factor
is a number assigned to different types of ionizing radiations in order to better determine their effect on tissue
Which of the following is (are) considered especially radiosensitive tissues?
Intestinal crypt cells
Possible responses to irradiation in utero include
Stochastic effects of radiation include
Somatic effects of radiation refer to effects that are manifested
during the life of the exposed individual
Which of the following is (are) considered long-term somatic effect(s) of exposure to ionizing radiation?
In the production of Bremsstrahlung radiation
the incident electron is deflected, with resulting energy loss
Which of the following cells is the least radiosensitive?
LET is best defined as
a method of expressing radiation quality
a measure of the rate at which radiation energy is transferred to soft tissue
absorption of polyenergetic radiation
Isotopes are atoms that have the same
atomic number but a different mass number
The effects of radiation on biologic material depend on several factors. If a quantity of radiation is delivered to a body over a long
period of time, the effect
will be less than if it is delivered at one time
The photoelectric effect is more likely to occur with
absorbers having a high Z number
high-energy incident photons
positive contrast media
- absorbers having high z number
- poositive contrast media
Early symptoms of acute radiation syndrome include
nausea and vomiting
1 and 2
Biologic material is least sensitive to irradiation under which of the following conditions?
What is likely to occur if 25 rad is accidentally delivered to a recently fertilized ovum?
In fluoroscopy, the automatic brightness control is used to adjust the
kVp and mA
Which of the following would be considered an advantage of using
photospot camera film instead of cassette-loaded spot film to record
conventional fluoroscopic images?
Reduced patient dosage
If a radiograph, made using AEC, is overexposed because an exposure
shorter than the minimum response time was required, the radiographer
decrease the milliamperage
All the following x-ray circuit devices are located between the
incoming power supply and the primary coil of the high-voltage
the milliamperage meter
what three parts of the xray circuit are located on the primary low voltage side
timer autotransformer and kv meter
A type of laser used in CR scanners is
Which of the following x-ray circuit devices operate(s) on the principle of mutual induction?
Which of the following is/are components of the secondary, or high voltage, side of the x-ray circuit?
Which of the following are typical sizes of fluoroscopic photospot camera film?
70 mm and 105 mm
Which of the following functions to increase the milliamperage?
Increasing the heat of the filament
Light-sensitive AEC devices are known as
Which of the following devices is used to control voltage by varying resistance?
Which of the following is a device that can be used in lieu of an
image intensifier/charge-coupled device combination in digital
Flat panel image receptor
The most common cause of x-ray tube failure is
vaporized tungsten on glass envelope.
Which of the following is used in digital fluoroscopy, replacing the image intensifier's television camera tube?
Magnification fluoroscopy provides:
Increased resolution and increased patient dose
The device used to change alternating current to unidirectional current is
a solid-state diode
Which of the following contribute(s) to inherent filtration?
X-ray tube glass envelope
X-ray tube port window
Aluminum between the tube housing and the collimator
1 and 2
A device used to ensure reproducible radiographs, regardless of tissue-density variations, is the
How is the thickness of the tomographic section related to the tomographic angle?
The greater the tomographic angle, the thinner the section.
Although the stated focal-spot size is measured directly under the actual focal spot, focal-spot size in fact varies along the length of the x-ray beam. At which portion of the x-ray beam is the effective focal spot the largest?
at the cathode end
Fractional-focus tubes, with a 0.3-mm focal spot or smaller, have special application in
A device contained within many CR readers that functions to convert
light energy released by the PSP into electrical energy, is called a:
Which of the following is a type of television camera tube that
converts a visible image on the output phosphor of the image intensifier
into an electronic signal?
what is a cathode ray tube
is a television monitor tube that is viewed by the operator during fluoroscopic evaluation of the anatomy of interest.
Which part of an induction motor is located within the x-ray tube glass envelope?
where is the stator located
outside the glass envelope
Digital fluoroscopy units use which of the following devices in lieu of a television camera tube?
charge couple device
which part of the xray circuit operates on self induction
A parallel-plate ionization chamber receives a particular charge as
x-ray photons travel through it. This is the operating principle of
which of the following devices?
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