Acoustic Output - GE LOGIQ 7 Pro Quick Manual

LOGIQ 7/LOGIQ 7 Pro Quick Guide

Acoustic Output

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. Depending on the examination and type of tissue
involved, the TI parameter will be one of three types:
The TI and MI are displayed at all times. The TI display starts at a value of 0.0 and increments in steps of 0.1 The MI display values between 0 and 0.4 increment in
steps of 0.01 and for values greater than 0.4, increments in steps of 0.1.
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.
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.
Mechanical Index
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.
Display precision is ±0.1 and accuracy is ±50%. Accuracy of the power output displayed value on the Touch Panel is ±10%.
Safety
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