Ultrasound

Question 1

How frequency of ultrasound wave affects depth

Answer 1

high frequency → more detail, less penetration

lower frequency → transmits deeper, less detail

Question 2

Probes:

linear

sector

phased

Answer 2

linear: transmits high frequency, shallow waves
sector: transmits low frequency, deep waves

→ “scattering” deeper might make you miss something deep

phased: same as scattered but square so you can see heart between ribs

Question 3

Gain

Answer 3

amplification of signaml from probe onto screen

Question 4

B-mode

Answer 4

“basic” mode

real time visualization of structures

Question 5

M-mode

Answer 5

just one beam at a time transmitted

⇒ count # of baby heart beats

Question 6

Doppler red vs blue

Answer 6

red: flow towards probe
blue: flow away from probe