Basic Measurements
The Type of the hip joint is evaluated according to the following table:
TYPE
α
ß
1a
> 60° < 55°
2
43°- 60° 55°- 77°
3/4
< 43°
> 77°
Note:
The Hip Joint measurement must be calculated only with the included measurement
software!
13.7 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® 730Pro
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 scan head 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
Voluson
®
730Pro - Operation Manual
105831 Rev. 0 13-15
To Next Page
Loading...
