spacing or the frame rate, which could change the TI values. An increasing spacing may
decrease the TI, and an increasing frame rate may increase the TI.
Color Doppler Controls
Image Width: Narrowing the image width may increase the frame rate, which may increase
the TI.
Velocity Scale: Increasing the Velocity scale may increase the TI by increasing the pulse
repetition frequency.
Color ROI Size and Position: A narrower Color Region of Interest (ROI) may increase the
frame rate, which may increase the TI. A longer Color ROI, or a deeper Color ROI, may
decrease the pulse repetition frequency and decrease the TI.
Operating Frequency: Changing the operating frequency will affect both the displayed MI
and TI values because the beam formation is affected and transducer efficiencies may differ
between frequencies.
Combinational with B-Mode: Use of combination modes affects the TI and the MI through
the combination of pulse types. Because the TI is additive, simultaneous pulsing of B and
COLOR modes will cause larger TI values than sequential pulsing (e.g. auto-update). The
displayed MI will be from the pulses with the largest peak pressure.
Image Presets: Changing the image presets may indirectly change the color sensitivity.
Increasing the sensitivity could increase the TI values.
Color Doppler Triplex Controls
Image Width: Narrowing the image width may increase the frame rate, which may increase
the TI.
Velocity Scale: Increasing the Velocity scale may increase the TI by increasing the pulse
repetition frequency.
Color ROI Size and Position: A narrower Color Region of Interest (ROI) may increase the
frame rate, which may increase the TI. A longer Color ROI, or a deeper Color ROI, may
decrease the pulse repetition frequency and decrease TI.
PW Gate Size: A smaller PW Gate size may increase the allowable pulse repetition
frequency and may increase TI.
PW Gate Position: A shallower PW Gate position may increase the allowable pulse
repetition frequency and may increase the TI.
Operating Frequency: Changing the operating frequency will affect both the displayed MI
and TI values because the beam formation is affected and transducer efficiencies may differ
between frequencies.
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