2.
THE DEVELOPED TECHNIQUES IN TARGET TRACKING IN US IMAGES
2.1
MAIN PROBLEMS IN TARGET TRACKING IN
US IMAGES
Tracking
and measuring the movement of fetal organs on ultrasound images requires
solving the following problems:
-
Image
calibration and noise suppression;
-
Target
object location and tracking in cluttered background;
-
Fast
and accurate image geometrical transformation to allow for image variations
in the process of movement and imaging.
The
main sources of noise that may cause the target tracking failures are:
-
Periodic
noise due to imperfections is the VCR system;
-
Speckle
noise generated by the US imaging system.
The
main obstacles for the reliable organ tracking are:
-
The
target organ is camouflaged by other organs in the field of view;
-
Images
are spatially very inhomogeneous;
-
The
target image changes considerably in the video sequence.
2.2
IMAGE CALIBRATION TECHNIQUES
2.3
ORGAN TRACKING TECHNIQUES
2.4
TRACKING TECHNOLOGY
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