Radiology Quiz Pt. 3 Flashcards
What is the difference between AC and DC electrical current?
AC Alternate current flows in one direction then flows in opposite direction (back and forth, always there)
DC Direct current, flows in one direction (digital radiography)
What is the Frankfort plane?
Imaginary line that intersects the midsagital line and the altragus line (under orbits of eye)
What are the kvp settings range and maximum output?
Varies from 65,000-90,000/100,00kvp
Maximum - 65-90/100 kvp
What are kvp settings for child-xl adult?
Child - 65-70
Adult - 70-75
Xl adult - 75-90/100kvp
mA range?
7-15mA
Maximum output - 15mA
mA settings child-xl adult?
Child - 7mA
Adult - 10mA
Xl adult - 15mA
What’s another name for scatter radiation?
Compton effect
What does mA control?
Density/Quantity
What does kvp control?
Contrast/Quality
Insta oral film sizes and uses
#0 = pedo film (2-5years) #1 = anterior film 20 ct mount (age 6) #2 adult film 18 fms #3 long bitewing #4 occlusal film
Extra oral sizes
Panoramic
Child 5x12in
Adult 6x12in
Cephalometric
8x10in
5x7in
What is reduction?
When the processing occurs
Latent image becomes visible
What is the latent image?
Unseen image
Difference between small and large crystals?
Larger crystals the faster the film
What films speeds are now obsolete and why?
A,B,C (they are illegal)
They are very slow
What is phlangioma? How can it be prevented?
Patient finger in X-ray
Use image receptor holders
What is the difference between convex and concave aspects of the identification dot?
Concave - lingual
Convex - labial/facial
What is the difference between labial and lingual mounting? and which is more popular?
Labial is the viewpoint of looking at a patient (most popular)
Lingual is the viewpoint from inside the patients mouth
How much radiation is a patients finger and hands exposed to if holding the X-ray film during x-ray exposure?
2% or 2degrees radiation
What is the name of variety of energy wavelengths called?
Polychromatic beam
What is the purpose of the lead foil and black paper in a film packet?
Lead foil in film protects the patient from back scatter radiation
Black paper protects film from light exposure
What is the difference between open ended and closed ended PID?
Open ended reduces scatter radiation
Close ended increased career radiation
Illegal today
What is BID?
Another name for PID
Beam indicating device
What metals are found inside an X-ray tubehead?
- Molybdenum
- Tungsten
- Copper
What is alopecia?
Hair loss caused by radiation
What is the ideal storage temperature for film image receptors?
50-70degrees F or 10-24degrees Celsius
What does the unleaded glass/window/port do?
Allows X-rays to pass through
What does the tungsten filament do?
Release electrons when heated
What does the tungsten target/focal spot do?
High speed electrons strike the target to produce 99%heat and 1% radiation
What does the glass envelope do?
Keep X-ray from exiting tube in wrong direction
Cathode
(-)
Anode
(+)
What is quanta?
A bundle of energy with no mass or weight, a photon
If kvp is operating about 70 what is the minimum filtration thickness?
2.5 mm
If kvp is operating under 70 what is the filtration thickness?
1.5mm
What is an artifact?
Anything you can see on an X-ray that’s not suppose to be there
Ex: earrings
What are the two sides of infra oral film?
Tube side
Label side
