A brief description of vascular doppler studies

1. Presenter-
Guided by-
Dr. Twinkle Joshi Dr.
Vaishali Kuchewar
Vascular Doppler Studies

2. Ultrasound- Vascular
 Non invasive method that uses sound waves to evaluate
the
body's circulatory system and identifies blockages or
clots in the arteries and veins
 Produces pictures using sound waves. A small probe
known as transducer and gel is placed directly
on the skin.
 High-frequency sound waves travel from the probe
through the gel into the body. Probe collects the sounds
that bounce back.
 A computer converts sound waves to an image. It does
not use radiation.
 Captures real-time images, so it can show blood flow,

3. Types
 Color Doppler - converts sound waves into different
colors. Colors show the speed and direction of blood
flow in real time.
 Power Doppler - Provides detail of blood flow but it
cannot show the direction of blood flow
 Spectral Doppler -Shows blood flow information on a
graph and shows how much a blood vessel is
blocked.
 Duplex Doppler - Takes images of blood vessels and
organs and turns them into a graph.
 Continuous wave Doppler- Sound waves are sent
and received continuously. Shows accurate
measurement of blood that flows at faster speeds.

4. Uses
 Monitor the blood flow to organs and tissues.
 Locate stenosis, plaque or emboli and help plan
for their effective treatment.
 Detect blood clots (DVT) in the major veins of the
legs or arms and varicose veins.
 Determine suitability for angioplasty.
 Evaluate success of graft or bypass blood
vessels.
 Determine an enlarged artery (aneurysm).
 Evaluate a congenital vascular malformations
(arteriovenous malformations or fistula)

5. Preparation
 Jewelry is removed prior and loose, comfortable
clothing is worn.
 If abdominal vessels are being examined, unless the
examination is performed on an urgent basis, it is best
to fast before the procedure.

6. Principle
 Based on the principle of SONAR.
 When a sound wave strikes an object, it bounces back
.By measuring these echo waves, it is possible to
determine how far away the object is as well as its size,
shape, and consistency.

7. Procedure
Transduc
er
Computer
console
•Sends out
inaudible high-
frequency sound
waves into the
body
• Listens for
returning echoes
Jelly
•Applied to area under
examination and
transducer is placed .
•Gel allows sound
waves to travel back
and forth between the
transducer and the area
under examination.
•Image is based on
loudness (A),pitch
(f), time taken for
ultrasound signal to
return to transducer

8.  Doppler ultrasound, measures the direction and speed of
blood cells as they move through vessels. The movement of
blood cells causes a change in pitch of the reflected sound
waves (Doppler effect). A computer collects and processes
the sounds(pulse like) and creates graphs or color pictures
that represent the flow of blood through the blood vessels.

9. After procedure
 Most ultrasound exams are painless, fast, and
easily tolerated.
 Scanning over an area of tenderness, may
create pressure or minor pain from the
transducer.
 Ultrasound gel is wiped off the skin. It does
not stain or discolor clothing.
 One can resume normal activities
immediately.

10. Advantages
 Noninvasive (no needles or injections).
 Widely available, easy to use and less expensive
 Safe and does not use radiation.
 Gives clear picture of soft tissues that do not
show up well on x-ray images.
 Risks
 Standard diagnostic ultrasound has no known
harmful effects on humans.
 Intolerance in areas of inflammation and infection.

11. Limitations
 Deep vessels are harder to see than superficial
vessels. Specialized tests such as CT or MRI may be
necessary to properly visualize them.
 Smaller vessels are more difficult to image and
evaluate than larger vessels.
 Calcifications due to atherosclerosis may obstruct
ultrasound beam.

12. Results
 Normal result - blood vessels show no signs of
narrowing, clots, or closure, and the arteries have
normal blood flow.
 Abnormal results may be due to:
 Blockage in an artery by a blood clot
 Blood clot in a vein (DVT)
 Narrowing or widening of an artery
 Spastic arterial disease (arterial contractions brought
on by cold or emotion)
 Venous occlusion (closing of a vein)
 Venous reflux (blood flow going the wrong direction in
veins)
 Arterial occlusion from atherosclerosis

13. Thank you !