Flashcards in X-Ray Physics (Part II) (Irene Gold) Deck (135)
What three things are found inside the Cathode?
What is the source of the electrons that produce the x-ray?
What is the filament made out of?
When does a Thermionic Emission happen?
When current is applied to a filament
What controls the quantity of electrons (mA)?
Temperature of the filament
What part of the cathode encases the two filaments?
In what part of the Cathode does the Thermionic Emission occur?
What is the name of the positive electrode in the x-ray tube?
In most x-ray machines is the anode stationary or rotating?
What is the reason for a rotating Anode target?
To dissipate the heat that is generated
What is the focal area/spot of the Anode?
The exposed area of the tungsten target
How is the focal spot determined?
By the size of the filament
What does a Smaller filament produce as an outcome?
What is it called when "The effect of making the actual focal spot size appear smaller when viewed for the position on the film"?
Line Focus Principle
What give you a smaller effective spot on x-ray?
Smaller target angle
What is the term used that "Heats the filament causing a boiling off of electrons"?
How is the term Millamperage per Second defined (mAs)?
More Current=More Electrons produced= More x-ray produced= Greater Radiographic density (Darker)
What is the term used for overall blackening on the film?
What does the term Radiolucent mean?
Structures produce more blackening on the film
What term is used for "Structures that produce less blackening on the film"?
(Whiter on X-ray)
The relationship between what two components of x-ray mAs and density?
They are directly proportional
What is the primary way to control how black a film is?
If the mAs is increased what does that mean in terms of film exposure?
The film exposure time is increased
What is the minimum change in mAs to see a change in density on the film?
What does it mean to the density if the mAs is either doubled or halved?
The density will be doubled or halved, they are directionally proportional
What is the definition of Kilovoltage (kVp)?
The force applied to accelerate the electrons from the cathode to the anode at the time of exposure
When will the greatest number of high energy x-ray photons be produced?
When a great force of Kilovoltage (kVp) is produced
What is the relationship between wavelength and frequency?
If there is a low kVp what kind of energy and penetration are produced?