User's Manual

Clarius Ultrasound Scanner - HD3 Scanners Safety Topics
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Additional considerations:
• Minimize scan time by performing only medically required ones.
• Use diagnostic ultrasounds efficiently and effectively, as all other medical tools.
• Compromising the exam's quality by rushing the exam could result in a poor exam, which
could require follow-up exams, which then adds exposure time.
• Select the appropriate TI and MI range for the task at hand.
• Note that output is affected by frequency, focus, pulse length, and dwell time.
Output Display
The output display provides an indication of the potential for bioeffects that might be caused
by the ultrasound energy being emitted. With this information, users can better control the
diagnostic ultrasound equipment and examination to ensure that needed diagnostic
information is obtained with a minimum of risk to the patient.
Display Standards
The system output display consists of the following exposure indices to indicate the potential
thermal and mechanical effects:
• TI: This is continuously displayed over the range of 0.0 to maximum output, based on the
scanner and application, in increments of 0.1, and consists of the following indices:
• thermal index for soft tissue (TIS)
• thermal index for bone (TIB)
• thermal index for cranial bone (TIC)
Keep output display indices to a minimum. Select a TI based on:
• Approximate index for the application: TIS is used for imaging soft tissue, TIB for a
focus at or near bone, and TIC for imaging through bone near the surface (for
example, a cranial exam).
• Mitigating factors that might create artificially high or low TI readings: Location of
fluid or bone, or blood flow. For example, is there a highly attenuating tissue path
so that the actual potential for local zone heating is less than the TI displays?
• Scanned modes versus unscanned modes of operation that affect the TI: For
scanned modes (such as B-Mode), heating tends to be near the surface. For
unscanned modes (such as M-Mode or Doppler-type modes), the potential for
heating tends to be deeper in the focal zone.
• MI: This is continuously displayed over the range of 0.0 to 1.9, in increments of 0.1.
TI Display