Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
47 Cards in this Set
- Front
- Back
|
Leakage radiation cannot exceed? |
100 mR/hr @ 1 meter |
|
|
What type of filter do we use if we want uniform density of the foot? |
wedge |
|
|
What type of filter is a wedge? |
compensating filter |
|
|
The exam table is made up of what? |
carbon fiber |
|
|
Types of beam limiting devices |
collimator, cones, cylinders, and aperture diaphragms |
|
|
What is the last image hold feature? |
keeps last fluoro image on screen, helps reduce pt dose |
|
|
What is half-value layer? |
thickness of material needed to reduce the beam to half its intensity |
|
|
What is a flat piece of lead with a hole in the center that helps limit beam size? |
aperture diaphragm |
|
|
How much can linearity vary by? |
10% |
|
|
When do we use a grid? |
when the body part is greater than 10 cm |
|
|
What’s the purpose of filtration? |
remove low energy photons, decrease patient dose |
|
|
If trying to reduce scatter, where does the C-Arm tube need to be positioned? |
under the patient |
|
|
What is reproducibility? |
using identical settings for each exposure to get the same results |
|
|
How accurate does reproducibility have to be? |
5% or less |
|
|
Filtration for tubes that operate above 70 kVp? |
2.5 mm Al Eq |
|
|
When does the timer sound during fluoro? |
after 5 minutes |
|
|
kVp range for fluoro for an adult |
75-110 |
|
|
How accurate does distance indicator have to be? |
2% of SID |
|
|
How accurate does PBL have to be? |
2% of SID |
|
|
Two filtration types |
inherent & added |
|
|
Inherent filtration |
what is in the tube (glass envelope, insulating oil around tube, glass window in tube housing) |
|
|
Added filtration |
outside the glass window (collimator, sheets of aluminum, compensating filters) |
|
|
What material do we usually use for filtration? |
Aluminum |
|
|
Does faster film screen speed increase or decrease patient dose? |
decrease |
|
|
Minimum SSD for mobile radiography? |
12” |
|
|
In CR, what changes light to electronic signal? |
photomultiplier tube |
|
|
Every diagnostic imaging system must have? |
protective tube housing, correctly functioning control panel |
|
|
How accurate does centering indicator have to be? |
1% of SID |
|
|
Difference between light beam and X-ray must not exceed? |
2% of SID |
|
|
Filtration for tubes that operate at 50-70 kVp? |
1.5 mm Al Eq |
|
|
Filtration for tubes operating below 50 kVp? |
0.5 mm Al Eq |
|
|
Types of compensating filters? |
wedge, trough (bilateral wedge) |
|
|
Minimal SSD for stationary fluoroscope? |
15” |
|
|
Minimum SSD for mobile fluoroscopes? |
12” |
|
|
Occupational annual dose limit |
50 mSv |
|
|
Education and training annual skin, hands, & feet dose limit |
50 mSv |
|
|
Embryo and fetus monthly dose limit |
0.5 mSv |
|
|
Embryo and fetus entire pregnancy dose limit |
5 mSv |
|
|
Occupational cumulative dose limit |
Age x 10 mSv |
|
|
Occupational annual lens of eye dose limit |
150 mSv |
|
|
Occupational annual skin, hands, & feet dose limit |
500 mSv |
|
|
Nonoccupational annual frequent exposure dose limit |
1 mSv |
|
|
Nonoccupational annual infrequent exposure dose limit |
5 mSv |
|
|
Nonoccupational annual lens of eye dose limit |
15 mSv |
|
|
Nonoccupational annual skin, hands, & feet dose limit |
50 mSv |
|
|
Education and training annual dose limit |
1 mSv |
|
|
Education and training annual lens of eye dose limit |
15 mSv |
