Measurement Precision And Uncertainty; Acoustic Output Display Operation And Accuracy - GE LOGIQ 500 Advanced Reference Manual

Measurement Precision and Uncertainty

Precision
Measurement
Uncertainty
Table 6–143. Measurement Precision and Uncertainty

Acoustic Output Display Operation and Accuracy

LOGIQ 500 Advanced Reference Manual
2276614–100 Rev. 0
Precision and measurement uncertainty of the system used to
measure the acoustic output is provided in the following table.
These values are determined in accordance with Section 6.4 of
the Standard for Real-Time Display of Thermal and Mechanical
Acoustic Output Indices on Diagnostic Ultrasound Equipment ,
AIUM/NEMA 1992 and the Acoustic Output Measurement
Standard for Diagnostic Ultrasound Equipment , NEMA 1992.
Center Acoustic
Frequency Power
4.4% 1.5%
10.0% 3.4%
The Acoustic Output display shows MI (Mechanical Index) while
in B-Mode. When other modes are selected TIS, TIB or TIC are
displayed. The Setup/Custom Display menu page 9 will
determine which value (TIS, TIB or TIC) is displayed.
Display increments are 0.2 for values of one or less and 1.0 for
values greater than one. Display accuracy for MI is –15% to
+38%. Display accuracy for TI is –37% to +95%. Index values
less than 0.4 are not displayed.
FDA Acoustic Output Data
Peak
Rarefactional Acoustic
Pressure Intensity
2.6%
6.0% 11.6%
6–107
5.1%