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16 Cards in this Set
- Front
- Back
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Describe gain |
Measured in decibels, B knob. The system gain controls the degree of echo application, or brightness of the image |
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What does increasing the overall gain due to the image? |
increases the brightness of the entire image |
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Describe depth gain compensation DGC. |
🔹Attempts to show structures of the same acoustic strength with the same brightness no matter the depth. selective control for small segments of depth the display used to create a uniform image |
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What does dgc controls compensate for |
Compensates for attenuation by absorption, scatter, and reflection. |
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What does Acoustic power do? |
Lower acoustic Powers decrease transmitted acoustic energy and patient exposure to ultrasonic energy. 🔹Stronger pulse = stronger Echo 🔹weaker pulse = week or Echo |
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Can acoustic power create an image of uniform brightness from top to bottom? |
Power output alone cannot make an image of uniform brightness from top to bottom |
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What does the dynamic range knob manipulate? |
🔹Range of intensities from the strongest Echo to the weakest Echo that A system can display. 🔹Varies the range of Shades of Gray displayed |
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Explain the difference between low and high dynamic range |
🔹High dynamic range (wide) = more shades of grey, less contrast. 🔹Low dynamic range (narrow) = less Shades of Grey, more contrast. |
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Explain Zoom? |
Magnification |
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Describe pre-processing (write magnification) |
🔹Zooming in before you take the picture. 🔹Image is clear, defined, and sharp Aquires new data. |
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Describe post processing (read magnification) |
🔹Zooming in on a picture you took. 🔹Image starts to get fuzzy and pixelated. Uses old data. |
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Which four factors affect frame rate? |
🔹Image depth 🔹number of focal points 🔹select your size (field of view) 🔹line density All factors are inversely related. Make the machine do more stuff frame rate will suffer. |
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How does image depth affect frame rate? |
Inversely related. Decrease in depth increase frame rate. Increase depth decrease frame rate |
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How does number of focal points affect frame rate? |
🔹Decrease number of focal points = faster frame rate. 🔹Increase number of focal points = slower frame rate. |
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How does selector size (field of view) affect frame rate? |
🔹 decrease field of view = a faster frame rate. 🔹 Increase field of view = slower frame rate. |
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How does line density affect frame rate? |
🔹Increase the number of lines = slow frame rate. 🔹 Decreasing number of lines = fast frame rate |
