Biomedical Engineering Reference
In-Depth Information
Figure 11.
Two different re-slicing methods: (a) parallel re-slicing along the
y
-axis with
spatial spacing (
d
); (2) rotationally re-slicing along the
z
-axis with uniform angular spacing.
Reprinted with permission from the AAPM.
Figure 12.
Three different slices in parallel re-slicing: (a) at the front end of the prostate; (b)
in the middle of the prostate; (b) at the back end of the prostate. Reprinted with permission
from the AAPM.
Figure 13.
Three different slices in rotationally re-slicing of the same prostate: (a) slice at
0
◦
; (b) slice at
45
◦
; (b) slice at
90
◦
. The dotted contour is the prostate boundary outlined
by the operator. Reprinted with permission from the AAPM.
4.1.1. Evaluation of the slice-based 3D segmentation method
In order to demonstrate the feasibility of the slice-based 3D prostate seg-
mentation method, the segmentation experiments have been conducted using the
3D transrectal ultrasound (TRUS) images of six patients scheduled for prostate
brachytherapy (see Figure 14). The 3D US images were acquired with a 3D
