Lecture 19: Doppler ultrasound

Question 1

Continuous wave Doppler measures __-

Answer 1

flow dynamics, no structural data just movement

Question 2

continuous wave Doppler reads ___ information along the __length

Answer 2

velocity, entire transducer length

Question 3

t or f: with continuous wave Doppler hard to know where wave comes from

Answer 3

true

Question 4

t or f: continuous wave Doppler can generate image information

Answer 4

false

Question 5

Does continues wave Doppler have ability to measure very slow or very fast velocities

Answer 5

fast

Question 6

Based on color flow and continuous wave what wrong/ what is vmax and is that normal or abnormal. Identify 1

Answer 6

Lots of blue in PA- regurgitation flow
1. Regurgitation jet
Vmax= 6m/sec, should be 1m/sec

Question 7

color flow is good for evaluating __of flow

Answer 7

direction

Question 8

in color flow Doppler __sends out sound

Answer 8

each transducer

Question 9

in color flow the computer determines whether flow is ___ or __ from transducer

Answer 9

towards or away

Question 10

what type of Doppler used, normal or abnormal

Answer 10

color Doppler
Normal- red flow is away from probe and flowing LA—LV

Question 11

red color in color Doppler is __probe

Answer 11

towards

Question 12

blue color in color Doppler is __from probe

Answer 12

away

Question 13

t or f: power Doppler is used in cardio

Answer 13

false

Question 14

what is power Doppler used for

Answer 14

low flow systems (abdomen)

Question 15

in power Doppler computer disregards __ and just detects ___

Answer 15

direction, movement

Question 16

power Doppler very sensitive to patient __

Answer 16

motion

Question 17

what type Doppler used

Answer 17

power Doppler- just looking at blood flow, no direction

Question 18

image from liver- what wrong

Answer 18

Peritoneal fluid

Question 19

noticed nodule in liver, image does not show color, but lets say you do color Doppler and see color what wrong

Answer 19

acquired shunt- vessels should not be there (no color)

Question 20

normal or abnormal hepatic BF

Answer 20

normal BF

Question 21

normal or abnormal hepatic BF

Answer 21

abnormal
Line shows blunted dead vessels
Circle shows new vessel formation likely due to increased pressure in portal vein= PSS

Question 22

Image of splenic vein- what wrong. Attached to portal vein

Answer 22

Red- flowing in wrong direction, should be blue. Likely portal hypertension causing a build up of pressure and can’t flow

Question 23

spectral Doppler displays __ of flow for __purposes

Answer 23

waveform, measurement

Question 24

what are 2 types of spectral Doppler

Answer 24

pulse wave, continuous wave

Question 25

pulse wave ___indicates area to be sampled

Answer 25

small gate

Question 26

Continuous wave or pulse wave Doppler: very specific and therefore accurate

Answer 26

pulse wave

Question 27

Due to small gate in pulse wave Doppler you can’t image ___velocity. Generally __m/s

Answer 27

high flow, generally <1.5m/s

Question 28

pulse wave Doppler of pulmonary outflow tract- normal or abnormal

Answer 28

normal, no regurgitating jets

Question 29

what is relationship/equation for pressure and velocity

Answer 29

pressure= 4v^2

Question 30

normal pulmonary velocity = __m/s, therefore pressure=__

Answer 30

<2m/s Pressure= 4 (2)^2=4 16mmHg

Question 31

abnormal velocity is __m/s, and therefore pressure= ___

Answer 31

5m/s Pressure= 4 (5)^2 =100mmHg

Question 32

what wrong and what is abnormal of diastole and systole

Answer 32

dilated cardiomyopathy Diastolic and systolic very close together

Question 33

what wrong and what does diastole and systole show on M mode

Answer 33

hypertrophic cardiomyopathy Diastole and systole more space but very thick

Question 34

cat with hypertrophic cardiomyopathy. What is circled and what is sequela

Answer 34

Blood clot Can lead to paralysis of hindlimbs

Question 35

what wrong

Answer 35

Heartworm disease

Question 36

what wrong

Answer 36

mitral valve insufficiency- very thick

Question 37

what wrong

Answer 37

mitral valve insufficiency with regurgitant flow- blue color going in wrong direction

Question 38

For spectral Doppler use __ if >1.5m/sec and __ for low flow

Answer 38

continuous wave, pulse wave