Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
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
|
|
|
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
|
