FILAMENT CIRCUIT varies current sent to the filament in order to provide the required mA value
SECONDARY CIRCUIT high voltage transformers rectification x-ray tube
7 IMPORTANT PARTS TO ID
Incoming Line voltage
Step Up Transformer
Step down transformer
8 Circuitry Source Carlton Adler (1996). Principles of radiographic imaging An art and a science. (96-99).
Modifies incoming current to produce x-rays
Boosts voltage to range necessary produce x-rays.
Modifies incoming line power to produce thermionic emission from the filament wire.
Filament circuit adjusts to mA ratings (50 100 200 etc.).
After mA selection current sent to step down transformer to modify amps that reach
9 (No Transcript) 10 AUTOTRANSFORMER
RAISES OR LOWERS THE VOLTAGE
KVP TAPS LOCATED
220 VOLTS INCOMING CONVERTED FROM 100 T0 300 VOLTS
VOLTMETER - OFF OF AUTOTRANSFORMER
11 AUTOTRANSFORMER 12 TIMER SWITCH
Timer switch ends exposure (unless exposure button is let go prior to end of exposure because of dead man switch) .
Timer circuit controls number of photons produced.
MECHANICAL NO LONGER USED
spring wounded and not very accurate.
Synchronous timers synchronous motor w/60 revolutions/second min. exposure time is 1/60 sec and timer in multipulse
AEC - TIMERS monitors time and mA and terminates exposure when desired mAs is attained. Designed to provide the highest safe tube current for the shortest time.
mA METER located on secondary side of high voltage section.
13 (No Transcript) 14 generator 15 generators
Fuction to change mechanical energy in to electrical energy
Electrical current flowing through a conductor in one direction is _______
A battery is a source of direct current
16 X-Ray Tube Circuit 17 Rectification AC to DC
Single phase 100 ripple
Three phase supeimposes 3 AC waveforms each separated from each other by 120 results in nearly constant potiential 13 or 4 ripple
18 HIGH FREQUENCY
60 Hz TO 6000 Hz 1 ripple contstant
Capacitor discharge Mobile Units
Depression of exposure button causes charges a capacitor instead of an xray tube - light ready on when capacitor is fully charged the exposure switch triggers the discharge power supplied by batteries (plug in portables)
INCREASE THE VOLTAGE TO THE TUBE
SEE OTHER PRESENTATION
STEP UP OR DOWN
OPEN CORE CLOSED CORE OR SHELL TYPE
ABOUT 95 EFFICIENT
AUTOTRASFORMER _____ induction
Functions to provide ___________
Both types require AC for operation
21 (No Transcript) 22 Filament Current
Current comes from Autotransformer
Filament Rheostat controls the Ma selection
Ammeter shows current to
Step down transformer
Focal Spot Selector Switch located here
23 FILAMENT CURRENT 24 MA METER
MA METER THAT IS LOCATED AFTER THE RECTIFER IS TO MEASURE THE MA GOING TO THE XRAY TUBE
AMMETER ON FILAMENT SIDE MEASURES THE CURRENT TO THE STEP DOWN TRANSFORMER
25 (No Transcript) 26
Line voltage compensator adjusts for flucutations in incoming voltage
Timers (terminiates the exposure regulates the length of exposure)
(spinning top test QC)
Backup timer (AED fails)
Exposure Switch remote controlled to start the exposure
Is more efficiently tansported over long distances at low currents ahd high volatage in order to avoid large power losses
Amplitude and polarity of the current vary with time
AC sinusoidal wave
AC varies amplitude and periodic reversal of polarity
A coil of wire is a helix
Supplied with current it is a solenoid
Add an iron core simple form of
31 ELECTROMAGNETIC INDUCTION
3 WAYS TO CREATE MOTION BETWEEN LINES OF FORCE AND A CONDUCTOR
Move the conductor through mag field
Move magnetic lines of force
Vary the magnetic flux
32 Faradays law
Regulate the strength of the induced current
Strength of the Magnet
Speed of the motion
Angle of the magnet
Number of turns on the conduction coil
33 (No Transcript) 34 TYPES OF EQUIPMENT
MAMMO CHEST HEAD
35 (No Transcript) 36 (No Transcript) 37 PRACTICESTUDYREVIEW
YOU CAN DO IT !!!!!
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