Chapter 32 mobile radiography

Mobile examinations 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 produce image artifacts.

c. exam conditions can vary widely.

Mobile examinations often require

a. special adaptations of routine projections.

b. imaginative equipment manipulation.

c. innovative technical factor considerations.

d. all of the above.

d. all of the above.

In surgery or in the emergency unit, 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

d. all of the above

When it is determined that air-fluid level demonstration is a priority, ____ projection(s) may be required for ____.

a. one; air-fluid levels

b. two; one inspiration and one expiration

c. two; one AP and one lateral projection

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

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

Radiographers should move ____ away from the patient prior to making an exposure.

a. 3 feet

b. 4 feet

c. 6 feet

d. nine

c. 6 feet

During mobile radiography, it is the radiographer's 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 radiographer's responsibility to request that ____ leave the immediate area prior to exposure.

a. physicians

b. family members

c. health professionals

d. all of the above

d. all of the above

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

d. two: one for the patient and one for the radiographer

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. patient.

The more advanced, full-power mobile units use ____ energy for a power supply.

a. microwave

b. battery

c. capacitor

d. alternating current

b. battery

Output from battery-operated units is essentially

a. single-phase unrectified.

b. single-phase, fully rectified.

c. three-phase, 6 pulse.

d. high frequency.

d. high frequency.

During optimal mobile radiography of the chest, the recommended SID is ____ inches.

a. 72

b. 56

c. 40

d. 36

a. 72

Which grid type would permit wide exposure and centering latitude and would therefore be preferred for mobile radiography?

a. 6:1

b. 8:1

c. 10:1

d. 12:1

a. 6:1

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.

c. the batteries provide power for exposures and travel.

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.

d. low ratio and high frequency.

Modern DR mobile radiographic units possess

a. a flat panel detector for image review.

b. disposable, single-use batteries.

c. a cabinet for multiple DR receptor storage.

d. remote exposure controls.

a. a flat panel detector for image review.

Batteries used in mobile radiographic machines

a. are rechargeable.

b. provide power for mobility only.

c. recharge using 220-240 V AC power.

d. all of the above.

a. are rechargeable.

If the radiographer is unable to achieve a 72" SID during mobile chest radiography, an alternative distance to use is

a. 40".

b. 48".

c. 56".

d. 60".

c. 56".

If a chest radiograph requires 4 mAs at 72", the new mAs to use at 56" would be

a. 3 mAs.

b. 2.4 mAs.

c. 1.5 mAs.

d. 0.5 mAs.

b. 2.4 mAs.

The preferred method for demonstrating air fluid levels during mobile radiography is to make sure that the

a. SID is 60".

b. patient is sitting fully erect.

c. radiographic grid has carbon-fiber interspace material.

d. a nurse listens to the chest to indicate the air-fluid level location.

b. patient is sitting fully erect.

All of the following features are essential to a mobile radiographic unit EXCEPT

a. expandable 6-foot exposure cord.

b. automatic exposure control with single field.

c. dead-man type exposure switch.

d. clear display of exposure factors.

b. automatic exposure control with single field.

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 of little value due to the exposure latitude of 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.

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

Quantum noise that occurs on a portable radiographic image, is typically the result of

a. under exposure.

b. patient involuntary motion.

c. poor electrical connections due to frayed wires.

d. a grid ratio that is too low.

a. under exposure.