Safety Precautions
LOGIQ V2/LOGIQ V1 – User Guide 4-27
Direction 5610736-100 Rev. 9
Acoustic Output
When the “Auto Freeze” preset is selected on the Utility ->
System -> System Imaging screen, the system auto freezes if it
detects no change in the image.
Located on the upper right section of the system display monitor,
the acoustic output display provides the operator with real-time
indication of acoustic levels being generated by the system. See
the Acoustic Output chapter in the Advanced Reference Manual
for more information. This display is based on NEMA/AIUM
Standards for Real-time Display of Thermal and Mechanic
Acoustic Output Indices on Diagnostic Ultrasound Equipment.
Acoustic Output Display Specifications
The display consists of three parts: Thermal Index (TI),
Mechanical Index (MI), and a relative Acoustic Output (AO)
value. Although not part of the NEMA/AIUM standard, the AO
value informs the user of where the system is operating within
the range of available output.
Always be aware of the acoustic output level by observing the
Acoustic Output Display. In addition, become thoroughly familiar
with the Acoustic Output Display and equipment controls
affecting output.
Thermal Index
Depending on the examination and type of tissue involved, the
TI parameter will be one of three types:
• Soft Tissue Thermal Index (TIS). Used when imaging soft
tissue only, it provides an estimate of potential temperature
increase in soft tissue.
• Bone Thermal Index (TIB). Used when bone is near the
focus of the image as in the third trimester OB examination,
it provides an estimate of potential temperature increase in
the bone or adjacent soft tissue.
• Cranial Bone Thermal Index (TIC). Used when bone is
near the skin surface as in transcranial examination, it
provides an estimate of potential temperature increase in
the bone or adjacent soft tissue.
Allowing the machine to transmit acoustic output when the
probe not in use (or in its holder) can cause the transducer to
build up heat. Always lower the acoustic power or freeze the
image when not in use.
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