Mechanical Index; Changing The Thermal Index Type; Ti And Mi Display Accuracy; Controls Affecting Acoustic Output - GE LOGIQ V2 User Manual

Safety
Acoustic Output Display Specifications (continued)

Mechanical Index

Changing the Thermal Index Type

TI and MI Display Accuracy

Controls Affecting Acoustic Output

4-28
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.
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.
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.
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.
LOGIQ V2/LOGIQ V1
Direction 5610736-100 Rev. 9
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User Guide