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23 Cards in this Set
- Front
- Back
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T/F: A veterinary assistant may operate radiographic equipment under indirect supervision |
FALSE- under direct supervision of a registered veterinary technician or licensed veterinarian . Registered Tech may operate equipment under indirect supervision |
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Personnel monitoring equipment (devices) |
consists of devices designed to be worn or carried for the purpose of measuring the radiation dose received by an individual in the course of employment, education, or training |
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Examples of personnel monitoring equipment/devices |
film badges, thermolumnescent dosimeters (TLD), pocket dosimeters, and ring or wrist badges. |
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Which are the most commonly used devices? |
Film and TLD badges |
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Where should X-ray monitoring device be worn? |
Must be worn at the thyroid level on the collar outside the apron. |
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T/F: If fluoroscopy is used, an additional ring or wrist band must be worn. |
True |
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What are the Maximum Permissible dose limits? (Whole body, skin, eyes) |
Whole body (total dose)- 5 rems Skin and extremities (shallow dose)- 50 rems Lens of the eye (eye dose equivalent)- 15 rems |
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What is the occupational dose equivalent limits for persons under 18 years of age? |
May receive 10% of the adult occupational dose limits |
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How much lead equivalent should protective gear (aprons and gloves) be made of? |
Preferably 0.5mm lead equivalent but not less than .25 mm lead equivalent. |
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What are the recommended exposure factors to evaluate tears and cracks of aprons and gloves? |
85 kvp, 10 mAs, 40 inch focal film distance |
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T/F: gloves and aprons protect wearer from primary X-ray beam |
False: protect wearer form scatter radiation ONLY |
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What is the reduction of exposure from using .25 mm compared to .5mm? |
Placing .25mm lead equivalent in a primary x ray beam of 100 kvp is 60% compared to .5mm that attenuates the beam by 85% |
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Radiographing large animals |
Use cassette holders to reduce the assistants exposure to radiation |
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What does Increasing or maximizing the distance between the operator and the source of radiation do? |
Intensity of X-ray beam, scatter radiation diminishes rapidly as the distance between operator and source of radiation increases. Approx. by the square of the relative distance Ex: factor of 2, exposure is reduced to 1/4 of original amount |
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Examples of mechanical restraint |
vinyl or foam covered sandbags, foam wedges, plastic or foam troughs, plastic head braces and mouth specula, rope, gauze, tape, velcro straps, etc. |
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When should general anesthesia be used? |
when total mobility and complete relaxation of the animal patient is required for accurate positioning. |
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_____ ______ _______ can reduce patient dose and the exposure to the personnel from between two and five times without any loss of image quality compared to older calcium tungstate screens. |
rare earth screens |
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Kilovoltage |
penetrating ability (quality) |
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mAs |
amount (quantity) |
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Exposure cord cannot be less than ___ feet in length |
six |
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Digital cassette |
contain reusable phosphor plate, which is sensitive to X-rays but not light. |
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What is the advantage of using digital cassette over film developing? |
elimination of expensive film, absence of toxic developing chemicals and the speed. |
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T/F: Retakes represent one of the biggest cause of excessive unnecessary radiation exposure to veterinary radiographers |
true |
