Siemens SONOLINE G50 - Measurement Accuracy; Linear Measurements on a Multi-Planar Image

6 T e chnical Description
[ 1 ] I N S T R U C T I O N S F O R U S E 6 - 1 7
Measurement Accuracy
The following table describes the variability in accuracy for each parameter:
Parameter Ranges Accuracy
Image Depth Scale 20 to 240 mm
30 to 240 mm
< ± 3% or < 1 mm, if below 33 mm
< ± 3% of full scale
ECG/Image Time Scales 2, 4, 8, 16 sec.
< ± 5 ms
Two-dimensional Measurements
– Distance/Depth
up to 240 mm
< ± 3% or < 1 mm, if below 33 mm
– Area
up to 999 cm
2
< ± 6% or < 66 mm
2
, if below 11 cm
2
– Trace (Ellipse)
up to 999 cm
2
< ± 6% or < 66 mm
2
, if below 11 cm
2
– Angle
0° to 180° < ± 3% on ½ segment
– Ratio (A/B)
Result B/A & (A-B)/A up to 1.0
< ± 10% of A
Result A/B 1.0 to 99.9
< ± 10% of A
Time Motion (TM) Measurements
– Depth
up to 240 mm
< ± 3% or < 0.5 mm, if below 17 mm
– Time
up to 16 sec.
< ± 2%
– Heart Rate
15 to 999 bpm
< ± 5%
– Velocity
up to 999 mm/sec.
< ± 5%
Volume Measurements
– Volume (Area, Length, Diameter)
up to 999 cm
3
< ± 9% or < 3.2 cm
3
, if below 36 cm
3
– Thyroid Volume
up to 999 cm
3
< ± 9% or < 3.2 cm
3
, if below 36 cm
3
– Urine Remainder
up to 999 ml
< ± 9% or < 3.2 cm
3
, if below 36 cm
3
– Prostate Volume
up to 999 cm
3
< ± 9% or < 3.2 cm
3
, if below 36 cm
3
Linear Measurements on a Multi-Planar Image
The measurement accuracy tables are based on the worst-case linear
measurements for a multi-planar image.
Transducer: C6-3 3D, C6F3
NTSC Systems, Standard Sweep Speed
Measured Length
Depth
20 mm 40 mm 60 mm
80 mm within ± 5.8 % within ± 5 % within ± 5 %
160 mm within ± 10.5 % within ± 5.2 % within ± 5 %
240 mm within ± 17.8 % within ± 8.9 % within ± 5.9 %