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17 Cards in this Set

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A method of reporting the extent to which a signal can vary and still be accurately measured
Dynamic Range
Dynamic Range: units?
Decibels (dB)
Weak signals that fall below the lower dynamic range value, exceed the system's ___
Threshold
Strong signals that fall above the upper dynamic range value, ___ the system (reported as the upper dynamic range value)
Saturate
Does the dynamic range increase or decrease the more the signal is processed?
Decrease
Which of the following has the largest dynamic range?
A. transducer
B. receiver
C. scan converter
D. display
E. archive
A
Which of the following has the smallest dynamic range?
A. transducer
B. receiver
C. scan converter
D. display
E. archive
E
Inaccuracies may result when signals pass to a system component with a smaller dynamic range. How are these errors avoided?
Compression
A technique that reduces the dynamic range of a signal without introducing errors:
- the largest signal remains the largest
- the smallest signal remains the smallest
- the range of signals is reduced
Compression
Does the human eye have a wider or narrower dynamic range than system displays?
Narrower
Is compression adjustable by the sonographer?
Yes
An uncompressed signal within the receiver of an ultrasound system has a dynamic range of 110 dB. The signal undergoes 40 dB of compression. What is the dynamic range of the compressed signal?
70 dB
An uncompressed signal has a dynamic range of 85 dB. The signal undergoes 30 dB of compression. What is the dynamic range of the compressed signal?
55 dB
After compression, a signal within the ultrasound system has a dynamic range of 70 dB. The original signal was compressed by 40 dB. What is the dynamic range of the original, uncompressed signal?
110 dB
A signal within a system's receiver has a dynamic range of 60 dB after compression. The original signal was compressed by 50 dB. What is the dynamic range of the original, uncompressed signal?
110 dB
Do the following characteristics describe a narrow or wide dynamic range?
- few choices
- bistable image (B&W)
- high contrast
Narrow Dynamic Range
Do the following characteristics describe a narrow or wide dynamic range?
- many choices
- greyscale image
- low contrast
Wide Dynamic Range