General 2.4 Flashcards
All of these affect contrast?
kVP
What is the inherent filtration
Metal Housing
Insulating Oil
Glass envelope
What allows you to qualitatively change an image? What are 2 examples
MIPACs (using algorithms to mathematically change density values to predetermined numerical values)
Magnification and Edge Enhancement
Which one reads the electrical signal?
dark purple
Which one converts visible light to electrical signal
periwinkle
What increases magnification?
Increased object to receptor distance
What wave has the most energy?
Picture of a few and it is the one with the highest frequency (it was 4lol)
The energy needed to remove an electron from its shell is…
Binding energy
What is the focusing cup made of and what is its charge?
Molybdenum
Negative
Picture of an x-ray tube and asks what dissipates heat
Copper stem
Picture of an x-ray tube and asks what creates the electrons
Tungsten filament
The transformer that brings 110 volts to 3-5 and is controlled by what?
Step-down transformer
mA
What increases sharpness?
Increased source to object distance
Why did it take so long to switch from film to digital?
IDK, expensive equipment and patient comfort?
Picture of edge enhancement
Picture of length calibration or measurement ruler
If you change the tube from 6 to 12 what happens to the beam intensity
1/4
PSP what is important
Heat and Laser
Laser and scintillator- i think its this? haley
In the production of a digital image in CMOS, what does the x-radiation get converted to?
Electricity
Numerical value
Visible light
Gray value
visible light –> what the scintilator does
How fast does the x-ray travel in vacuum? (FITB)
speed of light
What is true about copper and tungsten?
K shell of tungsten is more energy than L shell
Characteristic radiation is…
Electron to electron
If you move the tube mesially but the object moves bucally where is it?
Buccal
SLOB
Which one has the lowest radiation
CCD
What is CCD?
Direct
Why is low vapor pressure important?
maintain vacuum
Bitewing where contacts are overlapped. What is wrong?
Horizontal angulation
Picture of X-ray head and says what must be maintained in space 5?
Vacuum
What is the point of line principle system?
Used to dissipate heat and increase resolution
What does the rectifier do to electrons?
always go cathode to anode
What does a rectifier do?
Turn all to direct and go cathode to anode
If it hits the nucleus directly what energy is release and what type of x-ray
Maximum, bremsstrahlung
Matter is..
Something with mass and takes up space
Which of the following is true?
Most is characteristic (not true)
idk
Edge enhancement does what?
Simulate or hide disease states
If you increase ___ , then the ____ of electrons will increase?
mA, amount
Which element is associated with film?
silver
What is not ionizing radiation?
Microwaves
What has the best spacial resolution?
Film
Definition of thermionic emission
Low voltage filament current heats the tungsten with the result being the separation of electrons from the outer shell of the tungsten atom
-separation of electrons
When object and receptor are not parallel and beam and receptor are perpendicular?
Teeth appear shorter
Small focal spot:
Higher spatial resolution
Decrease sharpening:
Larger focal spot
Definition of quality
Mean energy of the X-rays
High contrast needs low kVp
true
Edge enhancement multiple
What is a part of the cathode:
Tungsten filament
If you want to keep density the same, and double mA, what would you do to time
half it
Characteristic:
Electron from inner gets knocked out and electron from outer fills in
What would happen if you couldn’t compress x-ray files-
server wouldn’t have ideal storage space
Which of the following requires the use of chemical interactions to produce a radiographic image?
a. CMOS
b. PSP
c. Film
d. CCD
film
