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17 Cards in this Set
- Front
- Back
A method of reporting the extent to which a signal can vary and still be accurately measured |
Dynamic Range
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Dynamic Range: units?
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Decibels (dB)
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Weak signals that fall below the lower dynamic range value, exceed the system's ___
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Threshold
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Strong signals that fall above the upper dynamic range value, ___ the system (reported as the upper dynamic range value)
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Saturate
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Does the dynamic range increase or decrease the more the signal is processed?
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Decrease
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Which of the following has the largest dynamic range?
A. transducer B. receiver C. scan converter D. display E. archive |
A
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Which of the following has the smallest dynamic range?
A. transducer B. receiver C. scan converter D. display E. archive |
E
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Inaccuracies may result when signals pass to a system component with a smaller dynamic range. How are these errors avoided?
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Compression
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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
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Does the human eye have a wider or narrower dynamic range than system displays?
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Narrower
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Is compression adjustable by the sonographer?
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Yes
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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?
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70 dB
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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?
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55 dB
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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?
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110 dB
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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?
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110 dB
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Do the following characteristics describe a narrow or wide dynamic range?
- few choices - bistable image (B&W) - high contrast |
Narrow Dynamic Range
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Do the following characteristics describe a narrow or wide dynamic range?
- many choices - greyscale image - low contrast |
Wide Dynamic Range
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