NDLI: SAR analysis of the improved resonant cavity applicator with electrical shield and water bolus for deep tumors by a 3-D FEM

Content Provider	IEEE Xplore Digital Library
Author	Shindo, Y. Iseki, Y. Yokoyama, K. Arakawa, J. Watanabe, K. Kato, K. Kubo, M. Uzuka, T. Takahashi, H.
Copyright Year	2012
Description	Author affiliation: Sect. of Neurosurg., Niigata Cancer Center, Niigata, Japan (Uzuka, T.; Takahashi, H.) \|\| Future Creation Lab., Olympus Co. Ltd., Japan (Kubo, M.) \|\| Dept. of Mech. Eng. Inf., Meiji Univ., Kawasaki, Japan (Shindo, Y.; Iseki, Y.; Yokoyama, K.; Arakawa, J.; Watanabe, K.; Kato, K.)
Abstract	This paper discusses the improvements of the re-entrant resonant cavity applicator, such as an electromagnetic shield and a water bolus for concentrating heating energy on deep tumors in an abdominal region of the human body. From our previous study, it was found that the proposed heating system using the resonant cavity applicator, was effective for heating brain tumors and also for heating other small objects. However, when heating the abdomen with the developed applicator, undesirable areas such as the neck, arm, hip and breast were heated. Therefore, we have improved the resonant cavity applicator to overcome these problems. First, a cylindrical shield made of an aluminum alloy was installed inside the cavity. It was designed to protect non-tumorous areas from concentrated electromagnetic fields. Second, in order to concentrate heating energy on deep tumors inside the human body, a water bolus was installed around the body. Third, the length of the lower inner electrode was changed to control the heating area. In this study, to evaluate the effectiveness of the proposed methods, specific absorption rate (SAR) distributions were calculated by FEM with the 3-D anatomical human body model reconstructed from MRI images. From these results, it was confirmed that the improved heating system was effective to non-invasively heat abdominal deep tumors.
Sponsorship	IEEE Eng. Medicine Biol. Soc.
Starting Page	5679
Ending Page	5682
File Size	1394548
Page Count	4
File Format	PDF
ISBN	9781424441198
ISSN	1557170X
e-ISBN	9781457717871
DOI	10.1109/EMBC.2012.6347284
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-08-28
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Heating Tumors Cavity resonators Applicators Electrodes Finite element methods Liver
Content Type	Text
Resource Type	Article
Subject	Signal Processing Biomedical Engineering Health Informatics Computer Vision and Pattern Recognition

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