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  2. 電機資訊學院
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Please use this identifier to cite or link to this item: https://scholars.lib.ntu.edu.tw/handle/123456789/516618
Title: Feasibility of Transrib Focused Ultrasound Thermal Ablation for Liver Tumors Using a Spherically Curved 2D Array: A Numerical Study
Authors: H-L Liu
H Chang
W-S Chen
T-C Shih
J-K Hsiao
W-L Lin
HAO-LI LIU 
H-L Liu
H Chang
W-S Chen
T-C Shih
J-K Hsiao
W-L Lin
劉浩澧 
HAO-LI LIU 
Issue Date: 2007
Journal Volume: 34
Journal Issue: 9
Start page/Pages: 3436-3448
Source: Medical Physics
Abstract: 
The use of focused ultrasound thermal ablation to treat hepatocarcinoma and other liver tumors produces promising clinical results. However, one of the major drawbacks is the high absorption of ultrasonic energy by the rib, making partial rib removal necessary in many cases. This study numerically investigated the feasibility of using a spherical ultrasound phased array for transrib liver-tumor thermal ablation. An independently array-element activitation scheme, which switches off the transducer elements obstructed by the ribs based on feedback anatomical medical imaging, was proposed to reduce the rib-overheating problem. The numerical results showed that the proposed treatment planning strategy can effectively reduce the specific energy absorbed by the rib while maintaining the energy at the target position, which both reduces the rib-overheating problem and increases the possibility of treating a target lesion under an intact rib. The analysis also demonstrated that the target position and the ultrasound frequency play key roles in the treatment. Patients with diverse characteristics were also tested to show the generality of the proposed strategy. The proposed treatment planning strategy also provides useful information for evaluating the treatment effectiveness prior to clinically performing transrib ultrasound liver-tumor thermal ablation. ? 2007 American Association of Physicists in Medicine.
URI: https://scholars.lib.ntu.edu.tw/handle/123456789/516618
ISSN: 942405
DOI: 10.1118/1.2759888
metadata.dc.subject.other: Ablation; Medical imaging; Tumors; Focused ultrasound; Liver tumors; Numerical results; Transducer elements; Treatment planning; Ultrasonic energy; Ultrasound frequency; Ultrasound phased arrays; Ultrasonics; absorption; article; diagnostic imaging; feasibility study; feedback system; heating; human; liver tumor; priority journal; ultrasound
[SDGs]SDG3
Appears in Collections:電機工程學系

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