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26 Cards in this Set
- Front
- Back
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What numbers are used in the Binary system? |
A series of zeros and ones |
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When utilizing read and write magnification, in which process are the pixels enlarged? |
Read |
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What are 5 functions of the Received functions? (Alphabetically) |
1. Amplification 2. Compensation 3. Compression 4. Demodulation 5. Rejection |
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Which of the receiver functions can't be adjustable by the sonographer? |
Demodulation |
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The smallest amount of digital storage is |
Binary digit |
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Which control could you use to adjust the Attenuation of sound in certain areas? |
TGC's |
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How many shades of gray are in 1 bit? |
256 |
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Define Rectification |
Turns negative voltage into positive - corrects or eliminates negative voltage |
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Does write magnification except used old data? |
No |
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Where does coded excitation take place? |
Extends the bounds resolution to penetration thru SNR thru coding on transmit and decoding on receive |
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What newer technology utilizes long sound pulse waves to create an image? |
Harmonic frequency (fundamental frequency) |
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The smallest element in a digital picture is called? |
Pixel |
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Read zoom |
Post processing |
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Write zoom |
Pre processing |
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Where are images stored in the ultrasound machine? |
Scan converter |
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How many bits make up a byte? |
8 bits = 1 byte |
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What component of the ultrasound system implements changes during TGC adjustment? |
Post processing in scan converter |
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Which technology utilizes data that is collected from different scan lines to help produce the picture? |
Interpolation (fill-in) |
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What is an advantage of coded excitation? |
Increase signal to noise ratio |
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Which is incorporated with Demodulation? a) bit b) amplification c) rectification d) compression |
c) Rectification |
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Define Rejection |
Rejects low level noise -displays low level echoes only when clinically important |
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Which of the following receiver functions can't be changed by sonographer? |
Demodulation |
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With read (post processing), pre processing can occur? |
Yes |
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Is Attenuation a function of the receiver? |
No |
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Coded Excitation |
Complicated mathematical process that has "long" pulses to make them more usable for ultrasound.
-occurs in the beam former or pulser |
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Coded excitation helps with |
- improves signal to noise ratio - improves penetration - reduces speckle - improves contrast resolution (shades of gray) |
