L10.2 Introduction to sonography Flashcards by Matthew Lam | Brainscape

Q

Feaatures of ultrasound

A

Requires a medium for transmission
- Air/bone does not transmit US well
>20,000Hz
Speed of sound I biological tissues = 1540m/s (slight variability)
- Attenuated signals coming back to the transducer

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Q

White/black colours on sonogram

A

Strong reflection → white
Bones don’t reflect → black

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Q

3 different views/techniques for US

A

Parasternal long axis view (diameter ish)
Parasternal short axis view (rotated 90o)
Apical 4 chamber view

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Q

What is spontaneous contrast

A

Spontaneous contrast (blood shown in different colour on sonogram) → only apparent in low flow states

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Q

How is pericardial effusion shown on sonograms

A

Pericardial effusion → black region and strands going outside of heart seen → may compress heart

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