Week 2 Flashcards
Which cells have the same effect to radiation?
Somatic and genetic
Are young cells or old cells more vulnerable to radiation young or old?
Young
Define GRAY.
Quantity of energy imparted by the radiation to matter per unit of mass
Define SIVERT.
Absorbed dose as modified by quality factors for live tissues.
What is ALARA?
The basic safety procedures
What are the three key items for work safety?
Time, distance, and shielding.
How many millimeters of lead equivalent do gloves have ?
0.5mm
What is density?
The degree of blackness in a film.
What is density controlled by?
Exposed silver
What is exposed silver controlled by?
mAS
What is contrast?
The difference between tones
What is Dmax?
All the silver halide grains are developed.
What are some reasons for maximum blackness?
Not enough mAs, not enough kVp, and compromised developer.
What does mAs control?
Density
What is contrast controlled by?
kVps
What happens with high contrast?
A large difference between densities.
What happens with low contrast?
Small difference between densities.
What is a short scale of contrast?
Big difference between densities.
What is short scale contrast usually used for?
Bones and soft tissue?
How is short scale contrast achieved?
By using a lower kVp
What is a large scale of contrast?
Slight difference between densities.
How is large scale contrast achieved?
Using a higher kVp
Where is large scale of contrast commonly used?
Abdomen and thorax.
Where do you high a lower contrast long scale or short scale?
Longer scale
What is noise on a film?
Grainless textured appearance
What does grain relate to?
The size of the silver clumps
