Physical Principles

Question 1

Doppler Equation

Answer 1

dF= 2 Fo V Cos
_________
c

Question 2

dF

Answer 2

doppler shift

Question 3

Fo

Answer 3

carrier freq

Question 4

V

Answer 4

velocity

Question 5

Cos

Answer 5

angle

Question 6

c

Answer 6

speed of us through soft tissue 1540 m/s

Question 7

directly related to transducer

Answer 7

doppler shift

Question 8

What does the number 2 represent

Answer 8

two doppler shifts: red blood cells then act as a wave source

Question 9

frequency is

Answer 9

collected

Question 10

velocity is

Answer 10

calculated

Question 11

calculating for velocity

Answer 11

V = c Df
_____
2 Fo Cos

Question 12

velocity eq

v =

Answer 12

calculated value which represents velocity of flow (moving reflector) to calc, the freq must be known

Question 13

vel eq

Df=

Answer 13

known value, measured by doppler proportional to velocity of source

Question 14

vel eq

Cos=

Answer 14

angle determined form image

Question 15

cos of 90 =

Answer 15

0

Question 16

source of error for solving for velocity is

Answer 16

doppler angle theta which increased its nonlinear influence as the angle becomes closer to 90 degrees

Question 17

ideal doppler angle for vascular exam

Answer 17

60, obtained centerstream, parallel to walls

Question 18

what causes doppler angle to be < 60

Answer 18

vessel tortuosity which is unstable

Question 19

not reliable when

Answer 19

angle < 60