Physics Mod 7

Question 1

Law of hemodynamics

Answer 1

P = Q x R
Q = v x area
R = 8ln / pir^4

Question 2

Poiseuille’s law

Answer 2

Q = deltaP pi r^4 / 8 l n

Question 3

Bernoulli’s equation simplified

Answer 3

delta P = 1/2 p(v2^2-v1^2)

Question 4

Spectral window

Answer 4

in PW doppler
region without signal
signifies laminar flow

Question 5

Doppler risetime for a diseased vessel cut off

Answer 5

> 144 msec

Question 6

Arterial signal components

Answer 6

1) rapid acceleration
2) short flow reversal cause by high resistance of distal bed
3) diastolic forward flow component

Question 7

Resistive index

Answer 7

(systolic - diastolic) / systolic

Question 8

Pulsatility index

Answer 8

(systolic - diastolic) / mean velocity

Question 9

Systolic diastolic ratio

Answer 9

Systolic / diastolic