11. X-ray Emission Spectra Flashcards
What is the limiting factor of charectorisitc raditation energy?
Atomic number
On a graph, label;
1. Max energy
2. Min energy
3. Average beam energy
4. Line spectra
JUST DO IT BRUH
What is the end of the graph dependant on?
kVp
How do you find the average kVp?
Divide the peak kVp by 3 and 2 to get the range
What is the effective beam energy affected by?
- Waveform
- Filtration
- Atomic number
What is the line spectra determined by?
The atomic number
How can you tell that the atomic number (target material) has changed on a graph?
If the line spectra has moved
If the average energy of the beam is higher, what happens to the quality of the beam?
Higher quality
What is the affect of ripple on maximum energy?
There is no affect
If the number of photons has increased, and the height of the spectrum has also increased, what has happened to ripple?
Lower ripple
If there is a higher kVp, which way would the max energy move?
Moves further to the right
With filtration, as we get to our higher energy level, do we decrease as many photons?
No, not as much
What type of radiation can be filtered out by the filter?
Both charectoristic and Bremms
What affect does filtration have on the beam and graph?
6
- Decreases # of photons/Decreases the height of curve
- Greater reduction of low energy photons
- Lower patient dose
- . Increased average energy of beam
- No affect on max energy
If mA is the only thing that changes, what affect does it have on the graph?
- ONLY increases the height of the curve
- INcreases all types of photons
- Intensity is directly proportional to mA
- No affect on beam energy
If there is a higher atomic number, where will the line move?
To the right
