Lecture 19: Doppler ultrasound Flashcards
Continuous wave Doppler measures __-
flow dynamics, no structural data just movement
continuous wave Doppler reads ___ information along the __length
velocity, entire transducer length
t or f: with continuous wave Doppler hard to know where wave comes from
true
t or f: continuous wave Doppler can generate image information
false
Does continues wave Doppler have ability to measure very slow or very fast velocities
fast
Based on color flow and continuous wave what wrong/ what is vmax and is that normal or abnormal. Identify 1
Lots of blue in PA- regurgitation flow
1. Regurgitation jet
Vmax= 6m/sec, should be 1m/sec
color flow is good for evaluating __of flow
direction
in color flow Doppler __sends out sound
each transducer
in color flow the computer determines whether flow is ___ or __ from transducer
towards or away
what type of Doppler used, normal or abnormal
color Doppler
Normal- red flow is away from probe and flowing LA—LV
red color in color Doppler is __probe
towards
blue color in color Doppler is __from probe
away
t or f: power Doppler is used in cardio
false
what is power Doppler used for
low flow systems (abdomen)
in power Doppler computer disregards __ and just detects ___
direction, movement
power Doppler very sensitive to patient __
motion
what type Doppler used
power Doppler- just looking at blood flow, no direction
image from liver- what wrong
Peritoneal fluid
noticed nodule in liver, image does not show color, but lets say you do color Doppler and see color what wrong
acquired shunt- vessels should not be there (no color)
normal or abnormal hepatic BF
normal BF
normal or abnormal hepatic BF
abnormal
Line shows blunted dead vessels
Circle shows new vessel formation likely due to increased pressure in portal vein= PSS
Image of splenic vein- what wrong. Attached to portal vein
Red- flowing in wrong direction, should be blue. Likely portal hypertension causing a build up of pressure and can’t flow
spectral Doppler displays __ of flow for __purposes
waveform, measurement
what are 2 types of spectral Doppler
pulse wave, continuous wave
pulse wave ___indicates area to be sampled
small gate
Continuous wave or pulse wave Doppler: very specific and therefore accurate
pulse wave
Due to small gate in pulse wave Doppler you can’t image ___velocity. Generally __m/s
high flow, generally <1.5m/s
pulse wave Doppler of pulmonary outflow tract- normal or abnormal
normal, no regurgitating jets
what is relationship/equation for pressure and velocity
pressure= 4v^2
normal pulmonary velocity = __m/s, therefore pressure=__
<2m/s
Pressure= 4 (2)^2=4 16mmHg
abnormal velocity is __m/s, and therefore pressure= ___
5m/s
Pressure= 4 (5)^2 =100mmHg
what wrong and what is abnormal of diastole and systole
dilated cardiomyopathy
Diastolic and systolic very close together
what wrong and what does diastole and systole show on M mode
hypertrophic cardiomyopathy
Diastole and systole more space but very thick
cat with hypertrophic cardiomyopathy. What is circled and what is sequela
Blood clot
Can lead to paralysis of hindlimbs
what wrong
Heartworm disease
what wrong
mitral valve insufficiency- very thick
what wrong
mitral valve insufficiency with regurgitant flow- blue color going in wrong direction
For spectral Doppler use __ if >1.5m/sec and __ for low flow
continuous wave, pulse wave
