Biomedical Engineering Reference
In-Depth Information
7.5.4
Image Processing and Kinematics
A sample of a raw IVUS image is shown in Fig. 7.24; the black circular
area in the center is the IVUS probe (ultrasounds cannot be detected
inside the probe). The image processing was based on Open CV and
Visual C++.
The procedure for obtaining the blood vessel contour in 3D is
composed of the following steps:
1. Corresponding capture of video frame from IVUS and posture
from the magnetic tracker
2. Region of interest (ROI) selection from the raw images
3. Image iltering and conversion to grayscale
4. Catheter center search using Hough circle transformation
algorithm
5. Contour detection using Canny algorithm
6. Kinematics for contour posture calculation
Example images for this process and the lux diagram of the image
processing algorithm are shown in Figs. 7.24 and 7.25, respectively.
Filtered Borders and
Center Measurement
Raw images
Border Extraction
Figure 7.24 Raw image captured from the IVUS and image processing
results for: Cross section with and without branch.
 
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