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26 Cards in this Set
- Front
- Back
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SI unit for equivalent dose measurement is
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Sievert
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when an incoming x-ray excites an atom & the atom produces a new x-ray photon, what effect is this?
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Thompson
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what allows you to vary the size of the radiation field
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collimator
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OID increases
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scatter increases
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low dose technique
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optimized kvp, fast screens, minimum 40 SID
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difference in binding energy from an internal electron being dislodged & replaced by an external electron is called
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Compton effect
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kVp is decreased
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fog decreases
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creates the image on the film
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remnant radiation
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principle source of scatter
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patient
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reason for doing a safety check before making an exposure
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prevent accidental exposure of coworkers
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absorption of x-rays by matter
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attenuation
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boxlike device attached under the tube housing that allows the limited operator to vary t he size of the radiation field
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collimator
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Computed radiography eliminates the need for
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darkrooms
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Computed radiography is sometimes called a
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filmless system
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image receptor consists of
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cassette & the film
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greatest cause of unnecessary radiation exposure in patients
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repeat exposures
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its okay to have the radiation field larger than the size of the film
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false
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number of lead strips per inch
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grid frequency
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lead strips in a grid tend
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absorb scatter radiation & allow remant radiation to pass thru
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source of x-rays
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x-ray tube
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shields placed on or near the body are known as:
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contact shields
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reduction of patient dose is a valid reason for failing to repeat a film that is not diagnostic
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false
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radiographers may hold the patient or the cassette during an x-ray if necessary
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false
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grids will ___ patient radiation
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increase
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due to new grid technology the air gap method is seldom used
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true
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moving grid=
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bucky
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