bk ultrasound Flex Focus 1202, User Manual

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42 Chapter 2 December 2015 Flex Focus 1202 User Guide (BB1756-Q)
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.
References
[1] EN 60529:1991+A1:2000. Specification for degrees of protection provided by enclosures
(IP code).
[2] EN/IEC 60601-1:1990+A1:1993+A2:1995+A13:1996 Medical electrical equipment. Part
1: General requirements for safety.
EN/IEC 60601-1:2006 3rd Ed. Medical electrical equipment. Part 1: General requirements
for basic safety and essential performance .
[3] EN 60601-2-37:2001+A1:2005 +A2:2005 Medical electrical equipment – Part 2-37: Par-
ticular requirements for the safety of ultrasonic medical diagnostic and monitoring equip-
ment.
EN 60601-2-37:2008 Medical electrical equipment – Part 2-37: Particular requirements
for the basic safety and essential performance of ultrasonic medical diagnostic and moni-
toring equipment.
[4] UL 60601-1:2003 Medical Electrical Equipment – Part 1. General Requirements for Safety.
[5] CSA C22.2 No. 601.1–M90 Medical Electrical Equipment – Part 1. General Requirements
for safety.
[6] EN 60601-1-2:2001 + A1:2006 Medical electrical equipment - Part 1-2: General require-
ments for safety. Collateral standard: Electromagnetic Compatibility-Requirements and
tests.
EN 60601-1-2:2007 Medical electrical equipment - Part 1-2: General requirements for
basic safety and essential performance. Collateral standard: Electromagnetic Compatibil-
ity-Requirements and tests.

cos

1,8 +
 
cos –

cos
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
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100 0,5 +
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