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31 Cards in this Set
- Front
- Back
Which of the following is recommended to reduce unnecessary irradiation of the patient or persons restraining the patient and to decrease scatter radiation?
-opening the collimator as wide as possible -placement of a lead apron over the area of interest on the patient -selection of full wave rectification as opposed to half wave rectification on the control panel -adjust the collimator so that the smallest field size possible is used |
adjust the collimator so that the smallest field size possible is used
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Veterinary patients have a tendency to move while being positioned for radiographs. The radiographer should help to safely prevent artifacts of movement by:
-using shortest exposure time possible -altering the direction in which the x-rays move -selecting longer exposure time than is recommended -sedating all patients before taking radiographs |
using shortest exposure time possible |
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What is the thickness of lead impregnated rubber lining protective apparel in veterinary radiography?
-1cm -10 mm -0.5 mm -0.5 cm |
0.5 mm
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What type of dosimeter can be stored for years, maintains its information, and can be reused?
-pocket ionization chamber -collimator -thermoluminescent dosimeter -film badge |
thermoluminescent dosimeter
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Which statement is true?
-the body's cells are all approximately equally sensitive to radiation -ionizing radiation only damages DNA within reproductive cells -chemical restraint of veterinary patients is prohibited by the NCRP in the US -genetic damage is not detectable until future generations are produced |
-genetic damage is not detectable until future generations are produced
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All of the following are type of somatic damage except:
-cancer -cataracts -gene mutation -sterility |
gene mutation
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The best way to avoid scatter radiation is by putting distance between you and the primary beam.
True or False |
True |
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Which of the following tissues is least sensitive to ionizing radiation?
-Lymphoid tissue -Lens of the eye -Skin -Bone |
Bone
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The best way to check your safety equipment is to radiograph them to check for leaks in the lead. Leaks would show as white area on the film.
True or False |
False |
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According to state and federal guidelines, what is the maximum permissible dose of occupational radiation one can get in a year?
-0.5 rem/ year -1 rem / year -1.25 rem/year -5 rem year |
5 rem year |
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Which of the following statements are true?
-Veterinary personnel who restrains animals for radiology are often exposed to the primary beam -scatter radiation can be reduced by collimation -Aluminum filtration helps to increase soft, less penetrating x-rays thus increasing quality of the radiograph -scatter radiation is produced by the primary beam interacting with the anode |
scatter radiation can be reduced by collimation
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Scatter depends on:
-the intensity of the beam -the composition of the structure being radiographed -kilovoltage level -all of the above |
all of the above
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The name of the radiation monitoring device that is worn during exposure is
-calipers -dosimeter -rem -none of the above |
dosimeter
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After taking a radiographs you must wait 30 seconds before re entering the room to allow for the dissipation of radiation
True or False |
False |
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X-rays can not penetrate:
-bone -interior walls of most animal hospitals -lead -b and c |
lead
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Why are rotating anode x-ray machines more powerful than stationary cathode x-ray machines?
-The former allow greater dissipation of heat -the former allow the use of a smaller focal spot with higher tube currents -the former allow the use of shorter exposure times -all of the above |
all of the above |
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The primary source of radiation exposure to a technician during radiography is scatter radiation, which can be best defined as:
-radiation produced when no collimator is used -lower energy x-ray photons that have undergone a change in direction after interacting with structures in the patient's body. -high-energy x-ray photons from the primary x-ray beam -lower-energy photons produced when radiographing thick body parts |
lower energy x-ray photons that have undergone a change in direction after interacting with structures in the patient's body.
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For safety reasons portable x-ray machines should not be hand held.
True or False |
True |
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If a pregnant woman is in the radiolgy suite and her baby's cells are damaged by radiation what type of damage is this:
genetic somatic generational reproductive electromagnetic |
somatic
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Match the term with the measurement associated with it.
____dose equivalent ____absorbed dose 1.Gy 2.Sv |
__2__dose equivalent
__1__absorbed dose |
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A Sievert (Sv) is derived from the following equation
-Gy x quality factor = Sv -Gy x thickness = Sv -distance from focal point x mAs = Sv -distance from focal point x kVp = Sv -distance from focal point x quality factor = Sv |
Gy x quality factor = Sv
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A person in the radiology suite wearing lead goggles, thyroid shield, apron, gloves and a dosimeter is as safe as a person outside the radiology suite.
True or False |
False |
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A dosimeter should be worn
-under the lead apron -the entire day working in hospital -on a hook in the x-ray room -during radiographic procedures -constantly for a month |
during radiographic procedures
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It is permissible to place hands in the primary beam if wearing lead gloves.
True or False |
False |
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Lead gloves protect hands when laid on top of the hands.
True or False |
False |
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X-rays only travel downward in a straight line.
True or False |
False |
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Choose all the ways a person can be exposed to radiation from an x-ray machine.
-scatter radiation -the primary beam -x-ray leaks from the tube housing -developing x-ray film -handling x-ray film post exposure |
-scatter radiation
-the primary beam -x-ray leaks from the tube housing |
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A device on the x-ray machine that limits the size of the primary beam is called the
-collimator -window -aluminum filter -time switch -voltage regulator |
collimator
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Ways to decrease the number of personnel in the radiology suite include:
-using higher KvP settings -using lower time setting with higher mA setting -sedating patients -none of the above |
sedating patients
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Protective equipment protects you from:
-Primary beam so your body is protected from radiation -Both primary beam and scatter radiation -Scatter radiation and none of your body part should be in the primary beam |
-Scatter radiation and none of your body part should be in the primary beam
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You can reduce your exposure to radiation by increasing your distance from the primary beam.
True or False |
True |