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4.2.5.4 Color Doppler Calculation
A processing flow is shown in the following
Blood Flow Calculation
Body Tissue Velocity (R & I)
Blood Flow Velocity (R & I)
Blood Flow Intensity
Blood Flow Variance
Velocity
Calculation
Vmain
Artifact
Suppression
Velo
CFA Dyn
Interpolation
MTI Filter
Vsub
Abs
Vari
Gain
１． Removes unnecessary low velocity signal components form
body tissue structure such as cardiac wall.
２． Calculates complex signal of velocity of body tissue motion
from through the MTI filter, and calculates complex signal of
velocity of blood flow, instantaneous reflection intensity of
blood flow and velocity variance of blood flow from MTI filter.
３． Calculates average velocity of body tissue motion and
average velocity of blood flow.
４． Suppresses CFM artifacts from average velocity of body
tissue motion, average velocity of blood flow and reflection
intensity of blood flow.
５． Amplifies and attenuates CFM data.
６． Calculates CFA dynamic range in the CFA mode.
７． Interpolates complex data of body tissue velocity,
complex data of blood velocity, reflection intensity of
blood flow and velocity variance of blood flow in the
beam direction to double the number of lines.
4 - 14
L1E-EA0229
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