Information Technology Reference
In-Depth Information
Fig. 5.7 Illustration of the resampled cross-sectional images of the CTA data for the
construction of the ground truth data. a The segmented coronary artery is represented as 3D
surface (semi-transparent structure), b Cross-sectional images of the artery, obtained by slicing
the volume data using the planes perpendicular to the orientation of the vessel
Fig. 5.8 Determination of the ground truth data based on the successive cross-sections. a An
example of the annotation of the observer (show in blue), the red circles are the control points
determined by the observer (the square denotes the starting control point), b The resulting ground
truth data determined by the software in red. The red dot indicates the centre and the circle
represents the radius of the artery at this cross section
Since the manual segmentation procedure is very time consuming, only four
major branches, i.e. right coronary artery (RCA), left anterior descending artery
(LAD), left circumflex artery (LCX) and one large side branch of the coronaries,
were chosen for evaluation. In addition to the metrics defined in Eq. 5.10 , the
Hausdorff distance was also applied to measure the difference between the seg-
mented vessel surface and the manually delineated ground truth data. The Hausdorff
distance is defined as:
Search WWH ::




Custom Search