Chapter 16 Flashcards
A method of reporting the extent to which a signal can vary and still be accurately measured.
• “number of available choices”
Dynamic range
Units for dynamic range
Decibels
Weak signals are _ the systems threshold
Below
Signals that at too strong _ the system
Saturate
_ keeps the signals in a range of accurate measurement.
Dynamic range
Individual components of of a system have different
Different ranges
Individual components of of a system have different
Different ranges
As a general rule, the dynamic range of information _ the more it is processed
Decreased
Components _(such as _) process data with the widest dynamic range.
earliest in the imaging chain (transducer)
Components _ (_) process data with narrower dynamic ranges
Farther along (display)
Components _ (_) process data with narrower dynamic ranges
Farther along (display)
Component: tranducer
Dynamic range:
120dB
Component: transducer
Dynamic range:
120dB
Component: tranducer
Dynamic range:
120dB
Component: receiver
Dynamic range:
100-120dB
Component: receiver
Dynamic range:
100-120dB
Component: scan converter
Dynamic range:
40-50 dB
Component: scan converter
Dynamic range:
40-50 dB
Component: display
Dynamic range:
20-30dB
Component: display
Dynamic range:
20-30dB
Component: archive
Dynamic range:
10-30db
_ eliminates potential errors that occur when the dynamic range of one component is narrower than that of another component
Compression of dynamic range
_ eliminates potential errors that occur when the dynamic range of one component is narrower than that of another component
Compression of dynamic range
Compression eliminates _ that occur when the dynamic ranges of _.
Potential errors
one component is narrower than that of another component
Compression of dynamic range reduces _
the dynamic range of a signal without introducing errors
Compression of dynamic range helps to _ info into _ so we can see _
Compress
The correct shades of gray
The meaningful clinical info
Compression of Dynamic Range: Largest signal _ Smallest signal _ Ranges of signals _ Adjustable by _
Remains the largest
Remains the smallest
Is reduced
Sonographer
Compression of Dynamic Range: Largest signal _ Smallest signal _ Ranges of signals _ Adjustable by _
Remains the largest
Remains the smallest
Is reduced
Sonographer
Mathematics for compression uses _
dB
Wide dynamic range = _ shades of gray
_ contrast
Many
Low
Wide dynamic range = _ shades of gray
_ contrast
Many
Low
Gray scale image= _ dynamic range
Widest
Narrow dynamic range= _ gray shades
_ contrast
Fewer
High
Bistable = _ dynamic range
Narrowest
Fewer shades: _ choices Bistable or gray scale? _ dynamic range _ contrast
Few
Bistable
Narrow
High
Fewer shades: _ choices Bistable or gray scale? _ dynamic range _ contrast
Few
Bistable
Narrow
High
More shades: _ choices Bistable or gray scale? _ dynamic range _ contrast
Many
Gray scale
Wide
Low
