Ocular US Flashcards
1
Q
What is Ocular US good for?
A
Visualise retina if opacity anteiror to retina
2
Q
What does high frequency US produce
A
Better resolution
Poorer penetration
3
Q
How doe dense tissues appear
A
Hyperechoic - brighter
4
Q
How do less dense tissue appear
A
Less bright Hypoechoic
5
Q
What does increasing gain allo
A
Weak signals can be visualised - small FB, Posterior vitreous detachement
6
Q
What is lower gain good for
A
Detecting stronger signals such as masses and tumours
7
Q
What should you start with
A
High gain to detect weak signals
Continue with lower gain to improve resolution
Start with high grey scale - display maximum samples from white to black
8
Q
What is gain measured in
A
decibels
