GE LOGIQ V1 - Mechanical Index; Changing the Thermal Index Type; TI and MI Display Accuracy; Controls Affecting Acoustic Output

Safety
4-28 LOGIQ V2/LOGIQ V1 – User Guide
Direction 5610736-100
Rev. 9
Acoustic Output Display Specifications (continued)
Mechanical Index
MI recognizes the importance of non-thermal processes,
cavitation in particular, and the Index is an attempt to indicate
the probability that they might occur within the tissue.
Changing the Thermal Index Type
You can select the displayed TI type on Utility -> Imaging ->
B-Mode. This preset is application dependent so each
application could specify a different TI type.
TI and MI Display Accuracy
The TI and MI display starts at a value of 0 and increments do
not exceed 0.2 for the entire range of display.
When display MI>= 0.6, TI>= 3.6, the displayed values of MI and
TI is not lower than 50% or higher than 150% of the measured
value.
When display MI < 0.6, TI < 3.6, the absolute error of MI <= 0.3,
the absolute error of TI <= 1.8.
Controls Affecting Acoustic Output
The potential for producing mechanical bioeffects (MI) or
thermal bioeffects (TI) can be influenced by certain controls.
Direct. The Acoustic Output control has the most significant
effect on Acoustic Output.
Indirect. Indirect effects may occur when adjusting controls.
Controls that can influence MI and TI are detailed under the
Bioeffects portion of each control in the Optimizing the Image
sections.
Always observe the Acoustic Output display for possible effects.