Practical Lecture in Biophysics

1. 2nd Practical Exercise
Doppler sonography
Second Faculty of Medicine, Charles University
General Medicine, 1st year
Biophysics
Practical Exercises
Measurement of the blood flow velocity
in the radial artery

2. This slides show you how we get a record from Doppler sonography.

3. We need this technical equipment:
1. Bidop Hadeco ES-100V3
8MHz probe
Cable with USB
connection to a
computer
2. Ultrasound gel
3. Smart-V-Link 4.1 software 4. Gimp 2.10. software

4. 1. We start Smart-V-Link 4.1 software.
Double-click on the
icon of the software
on the screen.

5. 2. Patient Information opens.
We fill basic
information about
our patient.

6. 3. Save filled information about your patient.
Click on "Save".

7. 4. Main Screen opens.
We choose
"Individual Waveform".
We click on the icon.

8. 5. Individual Waveform opens.

9. 6. We turn the probe ON.
Press the
probe button.

10. 7. Now, the device is ready to measure.
Display is ON.

11. 8. We need to put ultrasonic gel on the probe top.
Approximately 3 mm thick
layer of the gel.

12. 9. Find a point in the elbow pit (cubital fossa or fossa cubitalis) where you are able
to detect pulse.
The elbow pit and the
radial artery on the right
hand.

13. 10. Put the probe on the point with pulse and move it slowly to locate the point
where the maximum Doppler sounds are heard.
An ideal probe angle to the
vessel is approximately
45 degrees.

14. 11. Individual Waveform opens.
Here, we double - click
to start measurement.

15. 12. Monitoring Screen with waveforms opens.
Red curve or positive
values are from the
radial artery.
Blue curve or negative
values are from an
adjacent vein.

16. 13. When the waveform becomes rhythmical and stable, we press the probe button
to freeze the waveform.
We need five QRS
complexes ("peaks")
for next analysis.

17. 14. We press PrtSc (Print Screen) on keyboard to save data.

18. 15. We paste Print Screen in open GIMP 2.10. software using CTRL+V.

19. 16. We use Crop tool to select graphic.
Press "Enter" to crop
selected graphic.

20. 17. We save the image. The image is prepared for next analysis.

21. Until this step, we did all steps together.
Now, your individual work starts.
The aim of your work is analysis of a record from
Doppler sonography and fill a protocol.
Next slides show you how to analyze the record and fill
the protocol.

22. Before the practical lecture, you will obtain such an image
with a record from Doppler sonography.

23. 18. Open the image in GIMP 2.10.
GIMP is a free to
download and install on
your computer.

24. 19. Open your Protocol. Fill information.
Your practical
lecture e.g. 1st =
1, 2nd = 2 …
Date of your
practical
lecture
Group
number and
team letter FILL IN
THE YELLOW
CELLS ONLY.

25. 20. Calibration
1. Put cursor
on "0" point.
2. Read values in pixels.
The X-axis value in "0" point is 243 pixels.
The Y-axis value in "0" point 441 pixels.
3. Put the values
into table in the
Protocol.
= conversion of
pixels to seconds
and cm/s

26. 21. Calibration
X-axis 4s
X-axis zero and
Y-axis zero
Y-axis
value

27. 22. Measurement
Systole begin
Systole top
Diastole end is
systole begin of the
next cycle

28. 23. Measurement
Completed
Measurement table

29. 24. Conversion
The data measured in pixels
are automatically converted
to seconds [s] and an unit of
velocity [cm/s].
Average values are
automatically calculated.

30. 25. Complete table

31. 26. Discussion and conclusion
cite source of
information