Improvement on the Thickness-direction Resolution of 2D Ultrasound Image Positioning
Date Issued
2012
Date
2012
Author(s)
Li, Zong-Han
Abstract
The ultrasound image is the common medical diagnostic equipment with a lot of advantages including real time imaging, low cost and nonradioactive. The theorem of ultrasound imaging is that a transducer receives the sound wave reflected from the target. The ultrasound system estimates the distance according to the information of reflected sound waves. Then, the system presents the distance information using a two dimension image. The ultrasound image can show the structure of human body, and it could be combined with position sensors, which are attached to an ultrasound probe, to find the target position. This positioning approach is called ultrasound image positioning. Positioning using single ultrasound image cannot be accurate since the thickness problem. In this thesis, a novel ultrasound positioning approach is proposed. This research used two ultrasound systems that are placed orthogonally. The proposed system can obtain an accurate target position using dual ultrasound images. For fixed target, the positioning error was less than 1 mm. For moving target, the positioning error was less than 1.8 mm.
Subjects
Positioning by ultrasound image
Coordinate transformation
Feature tracking
Type
thesis
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