x-ray tube, operating console, high voltage generator
Name the 3 principle parts of an x-ray imaging system:
low
Operating circuits are:
autotransformer
1st component of circuit to get power is:
1 coil
How many windings are in the autotransformer?
electrons boiled off (mA)
Thermal ionic determines:
electronic
Accurate type of timer:
when IR has received required radiation intensity
When does AEC terminate exposure?
lowest time highest mA
mAs gives:
500-1000 time
Step up transformer increases voltage by:
cathode to anode
Diode flows from:
rectifier, transformer, filament
High voltage contains__________, ____________, __________.
amplitude
Difference in primary and secondary waves?
solid state
Newer rectifiers are:
Positive only
Half wave rectifiers, when current flow through tube?
360 pulses
Full wave, 3 pulse unit, how many pulses?
high frequency
What type of machine is voltage across the tube constant?
High frequency
What type of machine is used for Mammo?
self 100%, half wave 100%, full wave 100%, 3 phase 6 pulse 14%, 3 phase 12 pulse 4%, 3 phase high frequency >1
List the voltage ripple
single phase
Which generator has lowest power rating?
Arm, protective housing, glass envelope
External parts x-ray tube:
Arches
Tube that ages and has tungsten. What happens?
Negative, Positive
Cathode is _______, Anode is _______.
Tungsten vaporizes
Most common cause of tube failure?
space cloud (charge) of electrons
Thermonic creates:
Magnetic field
Rotating anode turns by:
Tungsten
Target is coated with____________.
filiament
Source of radiation in x-ray tube is:
decreases it
Decrease focal spot size, tube angle
10,000 rpm
High capacity tube rotates:
Heel affect
Intensity of beam, lower on anode and:
cathode
The _______ is on thicker part of patient.
long exposure time
Tube failure occurs because of _____ ______ _______.
1-2cm
Approx. how long is the filament _________.
2 filaments
Dual focus tube has _________
kVp, mA, max time
Each tube has a chart showing____, ___, _________
stators
Outside glass envelope is _____________.
rebounding electrons
All focus radiation is produced from ________ __________.
anode angle
Heel effect is caused by ______ _______
smaller
Effect focal spot is:
single excessive exposure
Cracking of anode is:
In the filament
Where is the step down transformer located?
kVp x mA x s= HU
Heat Unit Formula
1 phase
kVp x mA x s x 1.35 = HU
Heat Unit Formula
3 phase 6 pulse
kVp x mA x s x 1.41 = HU
Heat Unit Formula
3phase 12 pulse
kVp x mA x s x 1.45 = HU
Heat Unit Formula
High Frequency
Diode
A diagnostic x-ray tube is an example of a: