Flashcards in Test 3 Ch 7,8,9 Deck (44)
3 types of IR systems
4 requirements to produce an X-ray:
Vacuum (tube housing)
Source of electrons (filament)
Accelerate electrons (voltage)
Stop electrons (target)
The beam of photons before it interacts with the patients body is called
Invisible image created after exposure before processing
Relationship of radiation intensity and distance from source of radiation
Inverse square law
The resulting beam that is able to exit from the patient is called
The difference in ____________ allows for the formation of radiographs. As radiation is absorbed differently in different tissues of the body
Which bone structure would be radiopaque ?
Air, superficial tissues
Exposure factors that determine the quality of the image
DR has a scintillator typically made of what .... that will convert electrons one n stored in the TFT
Amorphous selenium (a-Se)
The ________ determines the individual size of each pixel.
Indirect capture consists of a two step process:
X-ray photons converted to light using the scintillator and then -converted to electric signal
4 factors affecting image quality
The X-ray beam is described as
Polyenergetic or heterogeneous
The anode and cathode are what charges?
Cathode = negative
Form of X-ray beam collocation of field size that ensures the X-ray exposure field is no larger than receptor size
Positive beam limitation
The process of “coning down” indicates what?
In the cathode, As temperature increases and electrons start “boiling off” through a process called???
The X-ray tube is made of
To withstand extreme amount of heat
X-ray tabletops are:
The power of the X-ray system(the generator) is expressed in
Although it is recommended to prep the X-ray tube, repeated prepping of the tube can..
Damage the tube and shorten its lifespan!
The most sophisticated and desired tube system?
What does it mean when the imaging plate needs conditioning ?
Needs an intense white light source to clear the image
Multiple views; 60 images sweep the patient in one breath hold
Two basic sources of ionizing radiation:
Natural and man made
Natural ionizing radiation are
Man made radiation consists of
Uranium sun, and radium, (radon)
Stemming from sewers
X-rays interact with matter in 5 ways!
The two interactions of X-rays with matter that directly influence patients and workers
Compton scattering -effecting workers
Photoelectric -effecting patients