Bronchi Diameter Quantification from 3D CT Data

The line width quantification method was applied to chest CT images taken by a helical CT scanner to determine the diameters of bronchi. The original voxel dimensions were 0.29 x 0.29 x 1.0 (mm3). In order to make the voxel isotropic, sinc interpolation was applied along the 2-direction. The volume size used in the experiment was 90 x 70 x 80 (voxels) after interpolation.

Figure 10.14(a) shows the original CT images. After the initial region extraction by thresholding the line filtered images, the medial axis was detected using af = V2, 2, and 2^2 voxels. Figure 10.14(b) shows the results of axis detection at the three different scales. Note that the axis points of thin structures were detected only at the smaller two scales while those of large structures (the right segment) were stably extracted at the larger two scales. Figure 10.14(c) shows the results of diameter estimation using ae = 1.2 voxels based on the medial axes at these three scales.

Figure 10.15: Thickness estimation of cartilages from MR images. (a) Original MR images. The acetabular (pelvic side) cartilages are shown by arrowheads and the femoral head cartilages by arrows. (b) Thickness distribution of acetabular cartilages. The bone regions are volume-rendered in white. (c) Thickness distribution of femoral cartilages. (A color version of this figure will appear on the CD that accompanies the volume.)

Figure 10.15: Thickness estimation of cartilages from MR images. (a) Original MR images. The acetabular (pelvic side) cartilages are shown by arrowheads and the femoral head cartilages by arrows. (b) Thickness distribution of acetabular cartilages. The bone regions are volume-rendered in white. (c) Thickness distribution of femoral cartilages. (A color version of this figure will appear on the CD that accompanies the volume.)

0 0

Post a comment