Test 1 Flashcards
When was the first X-ray
1895
What was the early use of X-rays
Dermatology, hair restoration and shoe fitting
What is DEXA scans good for
Bone density
How do X-rays act?
Like particles
What happen when you have more electrons
The higher the binding energy
Photon energy is directly proportional to
Frequency
Photon energy is inversely proportional to
Wavelength
What is the units for energy levels in X-rays
KVp
What is the diagnostic imaging energy level
50-120 KVp
What is SID
From tube to Bucky
What is FFD
Tube to Bucky
What is TFD
Tube to Bucky
What is SOD
Tube to person
What is OFD
Tube to person
What is OID
Tube to person
What is the inverse square law
The further away from the source the less light hits the person. Thus not a clear picture. The decrease is by the square root
Inverse square law equation
I1/I2=d22/d12
At 10 feet what is the proportion of the X-ray beam you get hit
Change in mAs formula
I1/I2=d12/d22
What does KVp control
Quality of the picture
What does KVp represent
The force of the X-ray/penetration
What does mAs control
Quantity of the beams
What do you set first on the console
Set the mAS first
What is large focal spot used for
Torso
What is small focal spot
For extremities
What does the rectification step do
Keeps current going one way by using diodes
Three phase power is
3 60hz waves offset by 120 degrees
What is the evolution of the X-ray tube
Crookes, Coolidge and modern/rotating
What is the space charge effect
Electron cloud that is saturated with negative that prevents more electrons from joining
What does the line focus principle say
Increased thermal capacity = decreased image quality
What is the anode heel effect
The anode side has less radiation than the cathode side
What’s the anode heel effect good for
To limit radiation exposure to thinner body parts
How to decrease the anode heel effect
Compensation filter, collimating tighter, increase SID
What side should the anode side be on
Anode side up
How to warm up the tube
3 exposures, 10 seconds apart.
60, 70, 80 KVp
200mAs, 1 sec
