Rt103 Flashcards
Allows radiologic technologists to control the x-ray tube current and voltage
Provides for control of line compensation, kvp, mA, and exposure time
Control console
Measures the voltage provided to the xray imaging system
Adjust the voltage to precisely 220v
Line compensator/monitor
Provide different voltage for input to the step-up and step-down transformers
Autotransformers
Components of high voltage generator
Rectifiers
Transformers
The production of an emf in a circuit by a change in the current in an adjacent circuit that is link to the first flux line of MF
Occurs when two coils are place in proximity and a varying current is supplied to the first coil which induces a similar flow in the second coil
Mutual induction
The force field that are created when magnetic dipoles orient to create magnet
Magnetic flux
Used to change low voltages into higher voltages or vice versa in an AC circuit
They placed inside a metal box about the size of a table or desk
Transformers
Produces magnetic flux or which generates MF when connected to the electrical source
Primary winding
helps to link almost all the fluxes to the secondary coil
Magnetic/transformer core
Converts MF to current flow; gives desired output power and desired voltage
Secondary winding
A simple transformer made with two coils of wire in close proximity to facilitate mutual induction
Air core transformer
When primary and secondary coils have an iron core placed within them, the strength of the MF is greatly increased,
Open core transformer
To correct the difficulties with an open core transformer by placing an iron bar on the top of the open core
Closed core transformer
Uses central iron core with both the primary and secondary wires wrapping around the iron core
Shell core transformer
is caused by
inherent resistance to current flow
that is found in all conductors.
- this is minimized by using low
current resistance wire, such as
large-diameter copper and by using
high voltage and low
current/amperage.
-low power is given off as heat.
Copper loss
in the core occurs because energy is
expended as the continually changing
AC current magnetizes, demagnetizes
and remagnetizes the core material,
producing heat loss.
-can be minimized by using a silicon
core.
Hysteresis loss(lagging loss)
result of currents opposing the
cause that produced them.
Eddy current loss
3 types of transformers used in xray circuits
Autotransformers
Step-up transformer
Step-down transformer
Converts a lower AC-voltage into a higher AC voltage and is also called the high-voltage transformer
Step-up transformer
produce an
output voltage that is lower than an
input voltage.
Used to apply high current to the tube filament
Step-down transformer
is used to
vary the incoming line voltage for the
HV (high-voltage) step-up transformer.
Autotransformers
is
used to increase the incoming line
voltage to the kV range which is
necessary for x-ray production
Hv step-up transformer
is the component which
varies current resistance and acts as a
variable milliampere (mA) selector to
select mA for various radiographic
examination
Rheostat
are solid-state devices that
allow current to flow in only one
direction.
• They are used to convert HV AC from
the secondary side of the step-up
transformer to HV DC, which is applied
to the x-ray tube.
Rectifiers
Rectifiers are sometimes called
Diodes
Uses solid-state diodes to effectively
suppress the negative portion of the AC
sine wave.
Half wave rectification
This produces more uniform pulsating DC
sine waves.
Full wave rectification
It requires six rectifiers to produce six usable
pulses per cycle.
Three phase circuit
Measures the amount of variation
between maximum and minimum
voltage.
Ripple
