Definitions
Comparison of the meaningful information in an image, compared to the amount of contamination
Signal-to-noise ratio
The 6 components of an ultrasound system
1. Transducer
2. Pulser and Beam Former
3. Receiver
4. Display
5. Storage
6. Master Synchronizer
5 operations that must be performed in the appropriate order for the system to function properly:
1. Amplification
2. Compensation
3. Compression
4. Demodulation
5. Reject
PRP and PRF are reciprocals
true
The most common way to improve signal-to-noise ratio
Increasing output power
Determines the firing delay patters for phased array systems
Two major functions of an ultrasound system
Preparation/transmission and reception
What does compression change?
The gray scale characteristics of the image
Amplification is not adjustable
false
Shallow imaging has a ____ PRP
shorter or longer?
shorter
Random and persistent disturbance that obscures or reduces a signal's clarity
Noise
During transmission, the transducer transforms ____ energy into ____ energy
electrical; acoustic
How many parts is demodulation?
Two
When displaying an ultrasound image, the display needs to be a flat screen
true
Makes the image brighter or darker
Alters the strength of the voltages in the receiver that the transducer created during reception
Receiver gain
The pulser functions during ___
transmission
Rejection affects all ____-level signals on the image
low-level
PRP is adjustable
true
The signal-to-noise ratio is high and creates a stronger signal than the noise, how is the image quality?
high or low?
Maintains and organizes the proper timing and interaction of the system's components
Master Synchronizer
Archives ultrasound studies
Storage
Synonyms for Compensation (3)
Time-gain compensation (TGC), Depth gain compensation (DGC), and swept gain
Compression is only performed once
false, twice
Deep imaging has a _____ listening time
Longer