Patient protection
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | invisible, long-term, cumulative
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| show | approx. 1 in 100 people are likely to develop solid cancer or leukemia from an exposure of 100 mSv above background dose
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| show | Good communication and quality assurance programs
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| show | single most important factor in keeping patient dose to a minumum, only tissues of diagnostic interest should be iradiated -reduces pt dose, reduces production of scattered radiation, improves quality of image
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| Beam restrictor types | show 🗑
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| Collimator | show 🗑
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| show | elementary -dedicated chest, dental unit, trauma imaging equipment -flat piece of lead having a central opening with a size and shape that determines the size and shape of x-ray beam
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| show | circular, lead-lined, slide into place in the tube head or onto the collimator housing Straight-prox and dist diameters identical Flare-dist diameter greater than prox diameter -limited use, more efficient bcs beam restriction is closer to anatomy
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| show | have a fixed opening size, only one field size at a given distance
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| show | controls quantity, no affect on quality
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| kVp | show 🗑
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| NCRP guideline for manual collimation must be within _____ of the SID. | show 🗑
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| Positive beam limitation-PBL | show 🗑
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| show | -required by the NCRP to be within 3% of SID for a single side and within 4% of SID for all 4 sides
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| NCRP guidelines for manual collimation | show 🗑
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| show | small light bulb to illuminate the field and a 45-degree angle mirror to deflect the light.
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| show | TRUE
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| show | high kVp, low mAs -also good bcs heat delivered to x-ray tube is lower and tube life is extended
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| Three-phase or high frequency generators | show 🗑
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| Inherent filtration | show 🗑
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| show | less than 50 kV = .5 mm Al 50-70 kV = 1.5 mm Al more tha 70 kV = 2.5 mm Al
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| Radiosensitive organs | show 🗑
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| Whose gonads to shield | show 🗑
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| Gonad shielding | show 🗑
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| When to shield the gonads | show 🗑
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| Contour shaped shields | show 🗑
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| Shadow shields | show 🗑
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| show | .025-.03 mm molybdenum filtration
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| show | beryllium-low atomic number (4)
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| show | thin sheets of aluminum that are added, collimator and its mirror
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| Why use PA instead of AP chest or spine? | show 🗑
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| show | True -place radiosensitive organs away from the entrance beam
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| Perform these exams in PA projection when possible. | show 🗑
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| good communication | show 🗑
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| show | placed under patient
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| Minimum response/reaction time | show 🗑
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| If the minimum response time is too high, how is this fixed. | show 🗑
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| show | film/screen radiography -four times faster than calcium tungstate phosphors
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| Advantage of digital fluoro | show 🗑
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| grids | show 🗑
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| air-gap technique | show 🗑
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| show | linearity and reproducibility
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| linearity | show 🗑
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| Reproducibility | show 🗑
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| High ratio grids with low kV | show 🗑
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| high ratio grids affect on positioning | show 🗑
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| low ratio grids | show 🗑
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| show | up to 90 kV
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| 16:1 grid good for what kV range? | show 🗑
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| show | general fixed equipment
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| T/F Moving grids call for less exposure than stationary grids. | show 🗑
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| show | -decrease length of exposure -use last image hold -keep pt as close to II as possible -use automatic brightness control setting with high kV, low mA -minimize "boost" and "mag" modes, low pulse rate -collimate to smallest field of view
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| Ways to decrease patient fluoro dose cont. | show 🗑
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| NCRP guidelines for x-ray tube housing leakage | show 🗑
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| show | no less than 12 in -12 inches in mobile radiography -15 inches in stationary radiography
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| show | fewer than 10 R/min
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| Where should the focal spot location be indicated? (NCRP) | show 🗑
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| How often should intensifying screens be cleaned and checked? (NCRP) | show 🗑
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| show | dead-man switch
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| show | RT should be able to see and communicate with the patient at all times
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| show | national council on radiation protection and measurements
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| Principal function of x-ray tube filtration | show 🗑
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Created by:
mmarnold2