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Physic2 x-ray ciruit

QuestionAnswer
Autotransformer measures in volts
What is the purpose of a step-up transformer electromagnetic; increase volts
What is the purpose of a step-down transformer increases amperage
Where is the kVp selector located attached to the secondary of the autotransformer
Where is the pre-reading voltmeter located secondary of autotransformer connected in parallel
Where is the exposure switch and timer located between the secondary of the autotransformer and the primary of the step-up transformer
Where is the mA meter located connected in series in the middle of the secondary of the step-up transformer
Where is the rectification system located Between the secondary of the step-up transformer and the x-ray tube
Where is the filament ameter located connected in series on the primary side of the step-down transformer
What are table tops made of carbon fiber, floating Tops, 90/30, and bucky slot cover
What absorbs very little of the primary beam carbon fiber
Fluoroscopy tables that tilt____ degrees to the feet and _____ to the head 90;30
Where is the line voltage compensator located on the primary side of the autotransformer
What does the line voltage compensator do It adjust the voltage(as there are are variations in line voltage sometimes) so that a consistent level of voltage is always supplied to the autotransformer
The filament circuit contains a mA selector called a rheostat
The filament circuit contains a step down transformer whos purpose is to increase amperage to the filament of the x-ray tube
The filament circuit contains a Filament ammeter
The mA selector and the filament ammeter are both located where on the primary side of the step down transformer
Where is the timer located between the secondary side of the autotransformer and the primary side of the step up transformer
Timers are located in the tube circuit
What kind of timer is very simple and used in smaller uits mechanical timer(cheap but not very accurate)
Mechanical timers can only be used for exposures greater than 250 milliseconds
What type of timer has a synchronous motor and is synchromized with a 60 current cycle Synochronous timers
The shortest exposure time that can be used is___ second and the time steps increase multiples of 1/60 is__,___ 1/60;1/30,1/20
These are the most sophisticated, most complicated, and most accurate Electronic timers
This is the most common type of timer used Electronic timers
The electronic timer has a exposuretimes avaliable as low as 1 millisecond
These timers are electronic timers that monitor the product of mA and time and terminate the exposre when the proper mAs is reached mAs timers
Where is the mAs timer located on the secondary side of the step-up transformer
What knid of timer automatically shuts the system of when the exposure is done phototimer
Whjat is rectification Voltage polarity control
The x-ray tube will work well is the cathode is always___ and the anode is always___ negative and positive
Since the current is A.C. rectification only happens in half the time
Rectification makes sure that the voltage is always being fed from cathode to anode in the x-ray tube
This is where the x-ray tube rectifies itself self rectification
Where is self rectification found in small portables and can only handle low techniques
Electrons flow through a single rectification circuit
This type of rectification uses either one or two valve tubes(thermionic diodes) half wave rectification
This will stop the current from reaching the anode on the reverse bias half wave rectification
During the half wave rectification the reverse bias is eliminated
What will allow higher techniques than self rectification half wave rectification
This uses four valve tubes and solid states rectifiers full wave rectification which is called the graetz bridge rectification
this will allow the voltage to be fed from cathode to anode in the x-ray tube full wave rectification
converts alternating current to direct current rectification
Valve tubes in rectification are thermonic diodes
solid state diodes in rectification are P-N junction
High frequency generators are used to replace what? Full wave or three phase rectification
What is the advantage of a high frequency generator That they provide a nearly constant potential voltage waveform and are very small
How much of a ripple do high frequency generators have 1%
Where can high frequency generators be placed because they are small insize they can be placed in the tube housing
What are the results of a high frequency generator ripple because it is almost constant potential it results improved image quality and lower patient dose
If the high frequency generator uses an inverted circuit what happens high speed switches or choppers which convert DC into a series of square pulses
What is the self rectification ripple 200% ripple
Half wave rectification 100% ripple
Full wave rectification 100% ripple
3 phase- 6 pulse 13% ripple
3 phase- 12 pulse 4% ripple
high frequency less than 1% ripple
steady direct current 0% ripple
What does a spinning top test do evaluate the accuracy of the timer and makes sure the rectification system is working properly
What is the spinnning top test used to test full wave rectification and halewave/ self rectification
Created by: atesta0824