Acoustic Output; Acoustic Output Display Specifications; Controls Affecting Output - GE LOGIQ C5 Quick Manual

LOGIQ C5/C5 PRO Quick Guide

Acoustic Output

Located on the upper right section of the system display monitor, the acoustic output display provides the operator with a 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:
• 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.
The TI and MI is displayed at all times. The MI display starts at a value of 0.0 and increments in steps of 0.1 while the TI display starts at a value of 0.4 and
increments in steps of 0.1 (values less than 0.4 are displayed as < 0.4). Display precision is ± 0.1, and accuracy is ± 50%.

Controls Affecting Output

The potential for producing mechanical bioeffects (MI) or thermal bioeffects (TI) can be influenced by the 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
Modes chapter of the Basic User Manual.
Always observe the acoustic output display for possible effects.
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