+
Related Flashcards
Cards In This Set
| Front | Back |
|
Order of tissue absorption from least to most:fat, air, metal, bone, water
|
Airfatwaterbonemetal
|
|
What is scatter radiation
|
Radiation that interacts with an attenuator and has changed in direction and lost energy
|
|
Wave Theory Equation
|
C= frequency * wavelength
|
|
Particle Theory Equation
|
E= frequency * wavelength
As known as quantum theory Bundle of energy = quantum or photon |
|
Inverse Square Law Equation
|
X-rays travel in straight line
I1/ I2 = d22/ d21 |
|
Direct Square Law Equation
|
MAs1/ mAs2= d21/ d22
|
|
3 Interactions In the tube
|
1. Heat 2. Brems- Further from N less energy lost= low energy beams3. Characteristic- knocks out electron making hole to be filled by outer shell electron
|
|
What is attenuation
|
Reduction in the intensity of the beam as it traverses matter by either absorption or scatter
|
|
Attenuation Interactions- In the person
|
1. Photoelectric Effect- absorption- Incident photon comes and knocks electron out and outer shell electron replaces and causes characteristic radiation
2. Compton Effect- Scatter- knocks out a valence electron and gives off scatter radiation-high energy= low angle |
|
4 components of a generator
|
1. Mains Supply -power switch -line voltage compensator
2. Primary-kV selector-kV meter-timer 3. High voltage circuit- rectifiers-mA meter-tube 4. Filament Circuit-mA selector-focal spot size selector |
|
3 types of Grids
|
1. Parallel2. Focused3. Cross Grids
|
|
Grid Cut off
|
1. Off level- uniform2. Off centered- uniform3. Upside down- peripheral4. Lg SID- peripheral5. Sm SID- peripheral6. Parallel- peripheral
|
|
2 Types of Filters
|
1. Inherent- by tube and housing- envelope -port- most-oil
2. Added-compensating -compound |
|
4 Types of Mobiles
|
1. Mains dependent2. Battery Dependent 3. Hybrid4. Capacitor Discharge
|
|
5 Image Enhancement
|
1. Enhancement - brightness& contrast2. Restoration3. Compression4. Analysis5. Sythesis
|
