| Author: | Lee, King Hong |
| Title: | The feasibility study of motion tracking using 3D ultrasound : phantom tests |
| Degree: | M.Sc. |
| Year: | 2014 |
| Subject: | Radiotherapy. Medical physics. Respiration -- Measurement. Hong Kong Polytechnic University -- Dissertations |
| Department: | Interdisciplinary Division of Biomedical Engineering |
| Pages: | ix, 73 leaves : col. ill. ; 30 cm. |
| Language: | English |
| Abstract: | Radiation therapy is a local treatment. During radiation therapy, the treatment machine aims beams of ionizing radiation at the tumor to kill cancer cells. A treatment plan intends to deliver sufficient dose to the tumor and spare the surrounding normal tissues. However, the normal tissues are incidentally irradiated during radiation therapy. In the abdominal and thorax regions, the positions of organs are not rigid due to respiration. It is great challenge to achieve a sufficient dose of radiation to the moving target as well as spare the surrounding healthy tissues during intra-fraction of radiotherapy. Management of the respiratory motion is considered in the radiation therapy. Management of the respiratory motion includes monitoring and controlling the respiratory motion. To monitor organ’s motion, some studies showed that soft tissue could be tracked using curved, linear arrays or 3-dimension (3D) curvilinear transducer. Any transducer has a constraint of the field of view (FOV) especially where the superficial tissue near to the transducer. To enlarge the FOV, a freehand ultrasound scanning technique and motion tracking of silicone phantom will be studied. This study aimed to evaluate the performance of 3D reconstruction of freehand ultrasound scanning and motion tracking of silicone phantom using 1D array ultrasound transducer. Freehand ultrasound scanning with electromagnetic tracking system and CT scanning of silicone phantom were performed. The dimensions in between ultrasound images and CT images were compared. Moving silicone phantom on a motorized table was tracked using ultrasound imaging. The result showed that there was no significant difference between dimensions in ultrasound images and CT images. The displacement of the phantom being tracked strongly correlated with the preset trajectory. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b27434655.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.76 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/7439