GE Voluson 730, Инструкция по эксплуатации

Страница: 30 / 96

Safety
Voluson
®
730 - Instruction Manual
2-20
105838 Rev. 3
2.15 Measurement Accuracy of the System
Measurements must never be made in a hurry, accurate positioning of the measuring cross or
measuring dots is necessary especially with area/circumference measurements.
Despite the high technical accuracy of the scan geometry and the measuring system of the
VOLUSON
®
730 equipment one must, however, be aware of inaccuracies caused by the ultrasound
beam properties and the physiological properties of the scanned structures, tissues and fluids.
For the reason of improved lateral resolution you should choose the proper scanhead for the depth
range of the structure to be measured.
The table shows the inaccuracies to be taken into account for measurements.
Accuracy Range
Distance +/- 3 % range of the system according to German KBV-regulations
Area +/- 6 %
Circumference +/- 3 %
Volume +/- 9 %
Explanation:
Distance error:
< +/- 3% (or max. 1mm for an object < 30mm)
Area: < +/- 6% = Distance 1 x Distance 2
Volume: < +/- 9% = Distance 1 x Distance 2 x Distance 3
a) Test Phantom: Multi-purpose phantom, Model 539, from ATS Laboratories Inc,
b) Wire Grid phantom in water bath at 47° C, accuracy of wire spacing 0.2 mm
2.16 Disposal
When disposing “Follow local governing ordinances and recycling plans regarding disposal or
recycling of device components”.
The instrument does not pose any unusual threat when disposing of it.