Title:Registration between 2D and 3D Ultrasound Images to Track Liver Blood
Vessel Movement
Volume: 19
Author(s): Kohji Masuda*, Taichi Shimizu, Takumi Nakazawa and Yoshihiro Edamoto
Affiliation:
- Department of Biomedical Engineering, Tokyo University of Agriculture and Technology, Tokyo 184-8588, Japan
Keywords:
Three-dimensional ultrasound image, gradient descend method, multiple image resolutions, hepatic artery, body motion, ultrasound images.
Abstract:
Background: For the accurate positioning of surgical tools, conventional intraoperative
navigation systems have been developed to recognize the relationship between target positions and the
tools. However, since an internal organ is deformed during the operation, registration between realtime
two-dimensional (2D) ultrasound images and three-dimensional (3D) CT or MRI images is not
always effective. Therefore, this study developed image registration between 2D and 3D ultrasound
images considering deformation for tracking target vessel movement in the liver.
Methods: 3D ultrasound image was obtained in advance with 3D coordinates, including the target
vessel. Then real-time 2D images and ultrasound probe position were simultaneously acquired using a
3D position sensor. We applied multiple image resolution registration, where rapid and fine optimizations
can be expected at higher and lower levels, respectively. Meanwhile, the gradient descent method
was adopted for the optimization, which determines the relative arrangements to obtain maximum similarity
between 2D and 3D images. We experimentally established resolution level parameters using a
phantom before applying it to track liver blood vessel movements in a normal healthy subject.
Results: Comparing the 2D images and the registered images, although the approach has some limitations
in tracking large displacement, we confirmed that the cross-section of the target blood vessel was
clearly visualized.
Conclusion: This method has the potential for an ultrasound therapy targeting blood vessels under
natural respiration conditions.