ultrasound physics ch 16
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What is dynamic range?
the method of describing the extent to which a signal can vary and still maintain accuracy.
We can think of dynamic range as "number of available choices."
What are the units of dynamic range?
Dynamic Range is... (3)
- 1.) a comparison
- 2.) a relative measurement
- 3.) a ratio
What is the general rule of dynamic range?
the dynamic range of information decreases the more it is processed.
What technique reduces the dynamic range of a signal without introducing errors?
What are the three requirements of compression?
- 1.) the largest signal remains the largest
- 2.) the smallest signal remains the smallest
- 3.) the range of signals is reduced
Can compression be adjusted by the sonographer?
EXAMPLE of compression
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?
What does a narrow dynamic range mean? (3)
- 1.) fewer shades of gray
- 2.) black and white (bistable)
- 3.) high contrast
What does a wide dynamic range mean? (3)
- 1.) many choices of gray
- 2.) gray scale
- 3.) low contrast
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