Ch 32 Quiz

b angulation of grids and grid cutoff

a common cause for repeat examinations in DR mobile radiography is due to a equipment reliability b angulation of grids and grid cutoff c variations in image brightness d low image contrast

b AEC with single field

all of the following are features essential to a mobile unit *EXCEPT* a expandable 6 foot cord b AEC with single field c dead man type of switch d clear display of exposure factors

d the final kvp is variable as a function of exposure time

all of the following are true of battery powered mobile units *EXCEPT* a their output is a function of current supplies by the batteries b they are quite popular due to their constant and predictable output c their maneuverability can be a challenge based upon their weight and size d the final kvp is variable as a function of exposure time

b set up for a cross table lateral projection of the knee to look for fat blood layering on the image

as you complete a trauma knee exam in the ER on a MVA patient the ER physician indicates they suspect a fracture that is not clearly visible. They ask you to take another image to see if there is the presence of a *lipohemoarthrosis*. in order to visualize this diagnostic finding you would a indicated that is not a radiology protocol and call the radiologist b set up for a cross table lateral projection of the knee to look for fat blood layering on the image c call CT and inform that you are recommending a CT exam of the knee d set up for an upright weight bearing knee in the ER suite at an expanded SID

b ask a nurse if it is possible to move the lines from the image area

as you prepare to complete a portable chest radiograph on a patient with possible CHF you notice several tubes and lines going into the patient prior to making the exposure you should a adjust your kvp to penetrate the opacity of the lines b ask a nurse if it is possible to move the lines from the image area c ask an orderly to hold the lines up and out of your exposure field d remove lines that are nonvital and complete the exam

a are rechargeable

batteries used in mobile radiographic machines a are rechargeable b provide power for mobile only c recharge using 220-240 V AC power d all of the above

b the attending physician

before entering a surgical suite who must be consulted a the unit receptionist b the attending physician c the surgical technician d all of the above

56 inches

convenient SID for mobile radiography

tethered detector

digital receptor with electrical cord

d all of the above

during mobile radiography it is the radiographers responsibility to protect a the patient b other health professionals c the public d all of the above

d all of the above

during mobile radiography it is the radiographers responsibility to request that ____ leave immediate area prior to exposure a physicians b family members c health professionals d all of the above

a patient

during mobile radiography the radiographer must achieve maximum distance primarily from the a patient b mobile unit c image receptor d x-ray tube

a 72

during optimal mobile radiography of the chest the recommended SID is _____ inches a 72 b 56 c 40 d 36

picker corporation

first to develop the portable unit

d low ratio and high frequency

for mobile radiography radiographic grids should have a a high ratio and low frequency b low ratio and low frequency c short focal range d low ratio and high frequency

two one for the patient and one for the radiographer

how many lead aprons should be carried to a mobile radiographic examination a none lead aprons are not necessary b one for the radiographer c one for the patient d two one for the patient and one for the radiographer

b 2.4 mas

if a chest radiograph requires 4 mas at 72 inches the new mas to use at 56 inches would be a 3 mas b 2.4 mas c 1.5 mas d 0.5 mas

c 56 inches

if the radiographer is unable to achieve a 72inch SID during mobile chest radiography an alternative distance to use is a 40 inches b 48 inches c 56 inches d 36 inches

d all of the above

in surgery or in the ER which situation should be considered a the stress of performing in a high tension environment b limitations due to aseptic conditions c the presence of additional critical equipment d all of the above

b false

it is acceptable for a tech to hold image receptor while making an exposure using a mobile x-ray equipment a true b false

b false

it is advisable to raise the exposure technique to the maximum level possible to ensure the image does not have quantum mottle a true b false

d all of the above

mobile examinations often require a special adaptations of routine projections b imaginative equipment manipulation c innovative technical factor considerations d all of the above

c exam conditions can vary widely

mobile exams are difficult to accomplish because a mobile equipment exposure techniques are dependent upon hospital power b stationary equipment is more reliable c exam conditions can vary widely d patient beds can produce image artifacts

a flat panel detector for image review

modern DR mobile radiographic units possess a flat panel detector for image review b disposable single use batteries c a cabinet for multiple DR receptor storage d remote exposure controls

d high frequency

output from battery operated units is essentially a single phase unrectified b single phase fully rectified c three phase 6 pulse d high frequency

establishing patient rapport

parking the portable outside the patient room

low ratio and high frequency

preferred radiographic grid characteristics for mobile radiography

c 6 feet

radiographers should move ____ away from the patient prior to making an exposure a 3 yards b 4 feet c 6 feet d 9 steps

CVP line

should be repositioned prior to exposure after consulting a nurse or physician

b battery

the more advanced full power mobile units use _____ energy for a power supply a microwave b battery c capacitor d alternating current

b false

the most reliable method of eliminating exposure fluctuations due to distance is to use 3 standardized distances 100cm 180cm and 208cm a true b false

c true an incognizant patient still be able to react to kind voice when given explanation

the unconscious patient requires the same explanation that a cognizant patient would receive a false an unconscious patient does not respond to instructions therefore does not require explanation b false an incognizant patient will not remember the given explanation c true an incognizant patient still be able to react to kind voice when given explanation d true an unconscious patient still be able to cooperate with breathing instructions

110 to 120 volts

typical power source for recharging batteries

d two air fluid levels and a normal projection of the chest

when it is determined that air fluid level demonstration of the chest is a priority ______ _____ projections may be required a one lateral decubitus b two supine and lateral decubitus c one dorsal decubitus d two air fluid levels and a normal projection of the chest

a requires a short axis grid

when performing a portable chest image on a broad chested male patient placing the receptor in a transverse orientation a requires a short axis grid b can eliminate the need for a grid c requires a longer SID than 72 inches d all of the above

d you should pay particular attention to patient clothing and lines to prevent image artifacts

when using a DR detector while performing a portable chest radiograph on a patient in the ICU a you must be aware of electrical shorts and shocks from the detector b exposure technique charts are off a little value due to the exposure latitude for the DR detector c you should increase the optimum exposure by 75 percent to ensure low quantum noise d you should pay particular attention to patient clothing and lines to prevent image artifacts

a 6:1

which grid ratio provides the best allowable centering latitude during mobile a xray procedure a 6:1 b 8:1 c 10:1 d 12:1

c the batteries provide power for exposures and travel

with current state of the art portable units a kvp is used to compensate for insufficient mas b it is safe to stand behind the unit for protection c the batteries provide power for exposures and travel d higher ratio grids are necessary

high frequency output

x-ray beam quality with current day portable units