Lecture 29 DA Flashcards
1
Q
What frequency is ultrasound?
A
Above 20kHz.
2
Q
What doesn’t transmit ultrasound very well?
A
Bone and air.
3
Q
How much of the energy produced by ultrasound is in the returning signal?
A
1/10,000 of the original signal.
4
Q
What does black and white reflect in ultrasound imagery?
A
Black - weak reflection.
White - strong reflection.
5
Q
What effect can ischaemia have on chordae tendinae?
A
They can snap as a result.
6
Q
What is the consequence of the atrial vestibules?
A
They can collect thrombi, which can embolise to the systemic circulation.
