click below
click below
Normal Size Small Size show me how
Bill's class
Unit 2 lessons 16-19
Question | Answer |
---|---|
What is voltage | Electrical unit of measurement |
How is kvp realated to the energy of the beam | It is directly related |
How is kvp related to optical density | it is directly related |
What should kvp be used to control | Radiographic contrast |
If the space charge compensator is working properly, what property of the primary beam is affected by kvp | Energy, penetrating power, and quality |
What is beam divergence | As the primary beam travels it spreads apart |
What is the geometric shape of the primary beam | Cone |
Why is the primary beam cone shaped | Beam divergence |
What is photon density | The compactness of the photons at a given distance |
As SID is increased what happens to photon density | It is reduced |
What is the relationship between the SID and optical density | they are inversely proportional |
What is the inverse square law | Intensity is inversely proportional to the square of the distance |
What is the formula for the inverse square law | I1/I2=(SID2/SID1)^2 |
What is the purpose of film development | convert a latent image to a manifest image |
Can a properly exposed film be over-developed, explain | No, futher increase in optical density beyond normal processing time is due to development fog activity |
During manual development what is considered "ideal" development time | 5 minutes |
Why are the images that are developed under five minutes lighter in optical density | They have not been fully developed (underdeveloped) |
How is development time related to optical density | directly related |
What is a latent image | Invisible image, has not been developed |
What is a manifest image | Visible image, after it has been developed |
How is temperature of the developer related to optical density | directly related |
What is chemical fog | Image that is fogged due to development |
What are three ways that a film can be fogged by action of developer | Developed to long, developed to hot, or contamination |
How is developer temerature controlled in an automatic processor | Thermastat |
During automatic development what is the maximum temperature latitude | +-0.5*F |