11.1.7 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®
S6/S8 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
Distance +/- 3 %
Area +/- 6 %
Circumference +/- 3 %
Volume +/- 9 %
Explanation:
Distance error: < +/- 3% (or max. 1mm for an object < 33mm) Area: < +/- 6% = Distance 1 x
Distance 2 Volume: < +/- 9% = Distance 1 x Distance 2 x Distance 3
•
Test Phantom: Multi-purpose phantom, Model 539, from ATS Laboratories Inc,
•
Wire Grid phantom in water bath at 47˚C, accuracy of wire spacing 0.2 mm
11.2 Calculations and Worksheets
11.2.1 Calculation Packages
The Calculation function supports calculation packages for following applications:
Abdomen Calculations
(chapter
'Abdomen Calculations'
on page 11-24
)
Small Parts Calculations
(chapter
'Small Parts Calculations'
on page 11-34
)
Obstetric Calculations
(chapter
'Obstetric Calculations - Subcategory: Biometry'
on page 11-
37
)
Cardiology Calculations
(chapter
'Cardiac Calculations'
on page 11-60
)
Urology Calculations
(chapter
'Urology Calculations'
on page 11-82
)
Vascular Calculations
(chapter
'Vascular Calculations'
on page 11-84
)
Gynecology Calculations
(chapter
'Gynecology Calculations'
on page 11-87
)
Pediatric Calculations
(chapter
'Pediatric Calculations'
on page 11-91
)
Neurology Calculation
(chapter
'Neurology Calculations'
on page 11-94
)
Orthopedics Calculations
(chapter
'MSK Calculations'
on page 11-97
)
Measurements and Patient Worksheets (Reports)
Voluson® S6/S8 Basic User Manual
5433669-100 Revision 4 11-23
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