no attenuation. In the body, and in particular, in water tank measurements,
nonlinear propagation and saturation losses occur as pulser voltages increase.
Therefore, the display accuracy estimates are based on the variability range of
transducers and systems, inherent acoustic output modeling errors, and
measurement variability. Display accuracy estimates are not based on errors in,
or caused by measuring according to, the AIUM measurement standards, or the
effects of nonlinear loss on the measured values.
Control Effects
Controls Affecting the Indices
As various system controls are adjusted, the TI and MI values may change. This
will be most apparent as the output power control is adjusted; but other system
controls affect the on-screen output values.
Power
The output power control affects the system acoustic output. Two real-time
output values are on the display: TI and MI. They change as the system responds
to power-control adjustments.
In combined modes, such as simultaneous Color, 2D, and PW Doppler, the
individual modes each add to the total TI. One mode will be the dominant
contributor to this total. The displayed MI will be from the mode with the largest
MI value.
2D Controls
• Sector Width: Narrowing the sector angle may increase frame rate. This
action will increase the TI. Pulser voltage may be automatically adjusted
down with software controls to keep the TI below the system maximums.
A decrease in pulser voltage will decrease MI.
• Zoom: Increasing the zoom magnification by pressing Zoom may increase
frame rate. This action will increase the TI. The number of focal zones may
iE33 User Manual
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4535 616 23901
Safety
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