Siemens SONOLINE G50, Инструкция по эксплуатации, Страница: 218 / 229

6 T e c h n i c a l D e s c r i p t i o n
[ 1 ] I N S T R U C T I O N S F O R U S E
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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 %