Part 4: Basic operation Flashcards
What is human eye integration time?
0.2 seconds
Cumulative time limit for actual fluoro on time
5 mins
How to maintain adequate contrast?
lowest mA and highest kVp appropriate
To reduce pt exposure, operator should select the (smallest/largest) field of view in non-magnification mode coupled with the (smallest/largest) manually collimated field size appropriate.
LARGEST field of view
SMALLEST manually collimated field size
When automatic collimation mode is NOT on, operator should use the ___ to manually collimate the x-ray beam so that the ____ are visible on the TV monitor.
collimator shutter devices
shutter blades
2 techniques to use to lower pt exposure when continuous exposure is not necessary
- last frame hold
2. video storage methods
Which is preferred in terms of pt exposure?
photospot film cameras or spot film cassettes
photospot film cameras with 70, 100, or 105 mm film sizes are better
___ has the same dose savings as photospot cameras with added benefit of instantaneous viewing of the image
digital photospot reading
___ and ___ should be tested annually at most to ensure image intensifiers provide adequate contrast.
brightness gain
contrast gain
should you use direct view systems or television camera/monitor or mirror optic systems?
YES television camera/monitor or mirror optic systems
NO direct view systems
Image intensifier should be as (close to/far from) the pt as possible
Close to
