Module 1 - Mobile Radiography Test Review

What are mAs ranges on mobile machines?

0.04 - 320 mAs

What are kVp ranges on mobile machines?

40 - 130 kVp

Describe concerns when using a grid for mobile radiography

When placed on unstable surface, grid tilts and can lead to grid cutoff

What are the grid ratios used for mobile radiography?

6:1 or 8:1

What focal ranges do grids have for mobile radiography?

36" to 44"

When is the anode heel effect more pronounced?

Short SID, Larger field size, Small anode angles

How should the anode-heel effect be used in mobile radiography?

Cathode end should be placed at thicker body part for maximum density

What SIDs are usually used for mobile radiography?  What concerns are there with using longer SIDs?

40" or 72", Longer SIDs require increase in mAs

Describe how you determine a mobile chest radiograph has distortion with cephalic angulation.

Position of the clavicles and how much of the lung apices can be seen above

Describe the radiation practices during mobile radiography.

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Source to skin distances should never be less than ?

12”

What protective precautions should be taken to cover the cassette in an isolation unit?

Place IR in clean protective cover

What do you ask family members to do when you are ready to do mobile radiography?

Exit the room

Where do you position a mobile unit for a supine mobile radiograph?

If pt supine, machine in middle of bed

Where do you position a mobile unit for a mobile radiograph on a seated patient?

If pt seated, machine near foot of bed

Describe correct collimation when performing mobile radiography?

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What do you do with traction devices?

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What is the single most effective means of radiation protection during mobile radiography?

distance

When should you shield patients during mobile radiography?

not anymore

Isolation patients usually consist of which patients?

patients who are considered sick and have an infectious disease that can be spread

In post-op mobile radiography, what is required before a technologist can move limbs that have had surgery?

check with MD or nurse

For fluid level detection, in what position do you place the patient?

affected side down

Where is the CR for a lateral decubitus CXR placed?

T7. Midline of body

Describe how to perform a lateral Decubitus CXR

place pt laying down on side, either left or right depending on what is needed to be seen. Will be AP projection.

What is not considered an artifact when performing mobile radiography?

Anything internal in a patient that cannot be removed

What are the criteria to determine sufficient aeration on a chest x-ray?

Ten posterior ribs must be seen above diaphragm

Name the specific guidelines used to determine if IR exposure (contrast and density) are sufficient.

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