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.
Access: restricted access

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