bk3000 User Guide
(16-01249-EN-01)
Safety Information
35
In the table in the Technical Data (BZ2100), the overall measurement accuracy for a
full range measurement is given in the right-hand column for each measurement. The
footnote below the table states the digital image resolution.
Time Measurements
In M-mode and spectral Doppler mode, data is displayed along a time axis. It is
possible to measure time differences. The accuracy for a time difference
measurement is
•
Rounded to the nearest: 0.01s
•
Accuracy: 0.01 x
t
where
t
is the full time scale of the image field.
Doppler Measurements
In measuring blood flow velocity it is assumed that the measured power spectral
distribution of the Doppler signal equals the blood cell velocity distribution.
The measurement accuracy of blood flow velocity is heavily dependent on the angle
between the ultrasound beam and the velocity vector of the blood cells. The
velocity accuracies given in the Technical Data (BZ2100) are valid for
= 55
. To
find the percentage accuracy for other angles, multiply the stated accuracy by
If the blood velocity exceeds the selected velocity range, aliasing occurs,
corresponding to an overload condition of the measurement system.
cos
1,8
+
cos
–
cos
------------------------------------------------
100
0,5
+
