imaging system test
Call Kai
Learn
Practice Test
Spaced Repetition
Match
Flashcards
Knowt Play1/44
There's no tags or description
Looks like no tags are added yet.
45 Terms
What is a diode
positive and negative side
What is anode made of
Rhenium alloy tungsten
Why does anode rotate
To prevent electrons from hitting same spot
At what rate does anode rotate
3400-10,000 rotation per minute
What is table top made of
Carbon fiber
How much lead in Bucky slot cover
.25mm lead
The control console is on high or low voltage side
Low
What does mrt stand for
Minimum response time
1 millisecond
Where are AEC chambers located
Between patient and IR
Where are phototimer AEC located
Behind receptor
What is backup timer for
Incase equipment fails
1 second
What does rectifier do
AC to DC
On secondary side
How many pulses in 1 second
120
Amp meter is series or parallel
Series
What is constant potential
Never dropped to 0
3 phase 6 pulse drops what percent
14%
3 phase 12 pulse drops what percent
4%
High frequency drops what percent
<1%
3 phase 6 pulse has how many rectifiers
6
Voltage ripple of single phase is what percent
100%
What is half wave rectification
Remove negative pulse
Why is 3 phase better than single
More efficient and better for pt Dose
What is falling load generator
Exposure begins at max MA then drops resulting in short exposure time
For a single phase unit with 50@ 5 and going to 3 phase what to do to technique
Half mas or increase kvp 15%
What parts make up imaging system
high voltage
Console
X ray tube
How is beam quality measured
Kvp
Line compensator does what
Increase or decrease voltage
What does auto transformer do
Gets voltage from line compensator & supplies it to high voltage side (filament)
Self electromagnetic
What type of induction does step up or down transformer work off of
Mutual
Kvp selector is also what
Auto transformer
Ma selector is also what
Rheostat
Transformer law formula
Vs/vp=ns/np
Ohms law
V=IR
Tube current measured in
Miliamps
Thermionic emission
Boiling off of electrons at filament
Kvp meters are in what kind of circuit
Parallel
What is space charge effect
Negative charges repel at the filament
Is the filament step up or step down
Step down
Actual focal spot is where
Anode
Effective focal spot is where
Body
What type of focal spot is good for tube life and detail
Large with steep anode angle
Window width controls what
Contrast
When you increase window width what happens
Lower contrast
When you increase window level what happens
Image gets darker
What is the minimum response time
1 ms