Biomedical Engineering Reference
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Figure 14. Initial segmentation slices of six different 3D TRUS prostate images obtained
from different patients. (a) This 3D TRUS image was used to determine the classification
criterion for selection of the vertex on the clockwise or anti-clockwise contours. (b-f)
These 3D TRUS images were used to evaluate the segmentation algorithms. Reprinted
with permission from the AAPM. See attached CD for color version.
US imaging system developed in our laboratory, using a tilt scanning mecha-
nism [24, 35, 36]. This system is used in both 3D US guided cryosurgery and
brachytherapy, as well as in the development of our 3D US guided breast biopsy
system [22, 44]. We used an Aloka 2000 ultrasound machine (Aloka, CN) with
a biplane side-firing transrectal ultrasound (TRUS) transducer, mounted in a mo-
torized scanning mechanism [22, 24, 35, 36]. The transducer was rotated about its
axis tilted through a total scanning angle of about 120 while a series of 120 con-
ventional 2D B-mode images were acquired with an 8-bit video frame grabber
operating at 15 fps. For each scan, the acquired 2D images were reconstructed
into a 3D image with the z -axis oriented parallel to the transducer axis [24,35].
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