X-Ray Units Flashcards
Components of the intraoral x-ray unit
tube head
extension arm
control panel
The ______ is the part of the unit where x-rays will be produced
x-ray tube
What is this definition:
X-rays will be produced when electrons inside the tube start
to accelerate and then collide against a target, thus turning
the kinetic energy of the electrons into x-rays
X-ray Production
electrical force that causes electrons to move
from a negative pole to a positive pole
voltage
number of electrons moving through a circuit
amperage
Electrical Components of tube head
low-voltage transformer
high-voltage transformer
electric current
autotransformer
Connected to the Cathode only
Electrical current to the filament (mA)
Lower the voltage
* 110-220V → ~3-10V
Low-voltage transformer / Step-Down transformer /
Filament transformer
More winding turns = ________ of low-voltage transformer
primary coil
less winding turns = __________ of low-voltage transformer
secondary coil
Connected to the Cathode and the Anode
Electron acceleration (kV)
- 110-220V → ~60,000-100,000V (60 kV – 100 kV)
High-voltage transformer / Step-up Transformer
Negative electrode (-)
Tungsten filament
* Source of electrons
* Highest tensile strength
* Highest melting point of any pure metal (6192°F)
Focusing cup
* Molybdenum
Low-voltage transformer (LVT)
Cathode
What does the following:
increases electrical current (mA)
increases filament temperature
increases amount of electrons
increases amount of x-rays produced
cathode
Positive electrode (+)
Tungsten block (target)
* Highest melting point
* High atomic number (74)
* More electrons in the orbitals
* Strong binding energy of electrons in the K orbital
Copper block (heat dissipation)
Anode
Between a stationary anode and rotating anode, which one is more commonly used in dental units
stationary
What does the following:
increases voltage applied (kV)
increases electron acceleration
increases kinetic energy
increases x-ray quality
increases mean energy of the x-ray photons
Electrons acceleration (Cathode to Anode)
What does the following:
decreases focal spot
decreases divergent x-rays
increases image sharpness
decreases heat dissipation
Anode (target)
What is the anode angle
20 degrees
Defines the voltage to the High-Voltage Transformer
kV selector
Stabilized and ideal voltage
autotransformer
Beam-indicating device (BID)
Aiming cylinder
- Direction of the x-ray beam
- Focal spot to object distance
- Shape of the x-ray beam= cylindrical or Rectangular
Position-indicating device (PID)
Lead disc
Blocks the more divergent photons
Collimates the beam area
collimator
What does the following:
decreases irradiated tissue
decreases radiation exposure
decreases secondary radiation
increases image quality
decreases fog
tube head
collimation x filtration
tube head
what 2 filtrations make up total filtration
inherent filtration
additional filtration
Which filtration:
X-ray tube glass
Insulating oil
inherent
Which filtration:
Aluminum Filter
Tube head exit
Additional
Connects the electrical wires
Horizontal and vertical movements
extension arm
