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Protection for Pat
Radiology / Medical Assistant
Question | Answer |
---|---|
The following provide protection from radiation --- | filtration & shielding & collimation ( beam restriction ) |
of the following which does not provide protection from radiation --- | ionization |
Unnecessary radiation is received by the patient and x-ray operator from --- | a repeat x-ray because of technical error or carelessness |
The x-ray beam should be collimated so that which of the following is true ? | the beam is restricted to the body part being x-rayed & the beam is no larger than the film |
What does a automatic collimator allow the x-ray machine operator to do ? | --use a film holder larger than the radiation field |
An improperly collimated radiographic beam will do which of the following ? | result in extra scattered radiation |
a device that projects a light field through a collimator to enable the machine operator to see the actual location of the x-ray beam before the exposure ? | a light localizer |
What is the "main" purpose of filtering an x-ray beam ? | to reduce radiation exposure to patient's skin |
on which of the following should gonadal shields be used ? | all patients with reproductive potential |
for male patients you shoudl use --- | shaped contact shield |
which of the following requires special shielding--- | the femur |
all of the following are primary exposure factors ---- | KVP, MA, exposure Time |
when yo increase the KVP and decrease the Milliamperes what happens to the skin exposure ? | it is decreased |
the following affects the quality (penetrating power ) of an x-ray beam ? | KVP |
to reduce a patients exposure time for the same quality of x-rays, you could use what combination ? | 90 ma for 2 seconds |
to reduce patients exposure to radiation you may try --- | Higher KVP & lower milliamperes |
If you do not change the KVP but you reduce the millliamperes by 20 %, what happens ? | patients exposure increases |
What are the two components of radiographic film ? | film base & emulsion |
When x-rays and light photons interact with the radiographic film, what happens to the film to produce the latent image? | silver halide is transformed into irregular clumps and strands of black metalic silver. |
When using intensifying screens , what type of film should you use ? | screen film |
A film holder must be ---- | light-tight and radiolucent |
as a basic x-ray machine operator in florida , which of the following combinations should you employ ? | a screen film, & cardboard holder |
the intesifying screen is used mainly ---- | to reduce amount of radiation required for exam |
The active layer (phosphor) of the intesifying screen does what ? | converts x-ray beam into light energy |
the rare earth screen is more popular than the calcium tungstate (CT) screen because of all of the following --- | it needs less radiation than CT, & permits shorter exposure, & faster |
what screen combination should you use to reduce pat exposure ? | High speed film |
the 16:1 grid absorbs the most scatter radiation | the 16:1 grid absorbs the most scatter radiation |