The Effects of Inhomogeneities on MCG forward Solution

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概要

• 論文の詳細を見る

• The aim of this study was to quantify the effects of inhomogeneities on magnetocardiography(MCG)forward solutions. It can serve to guide the selection of inhomogeneities to include in any geometric model used to compute magnetocardiographics fields. A numerical model of a human torso was used which construction included geometry for major anatomical structures such as subcutaneous fat, skeletal muscle, lungs, major arteries and veins, and the bones. Simulations were done with a single current dipole placed at different sites of heart. The boundary element method(BEM)was utilized for numerical treatment of magnetic field calculations. Comparisons of the effects of different conductivity on MCG forward solution followed one of two basic schemes:1)consider the difference between the magnetic fields of the homogeneous torso model and the same model with one inhomogeneity of a single organ or tissue added;2)consider the difference between the magnetic fields of the full inhomogeneous model and the same model with one inhomogeneity of individual organ or tissue removed. When single inhomogeneities were added to an otherwise homogeneous model, the skeletal muscle, the right lung, the both lungs and the left lung had larger average effects(15.9, 15.1, 14.9, 14.4% relative error(RE), respectively)than the other inhomogeneities tested. When single inhomogeneities were removed from an otherwise full inhomogeneneous model, the both lungs, the left lung, and the skeletal muscle and the right lung had larger effects(17.3, 14.9, 14.3, 14.2% relative error(RE)respectively)then other inhomogeneities tested. The results of this study suggested that accurate representation of tissue inhomogeneity has a significant effect on the accuracy of the MCG forward solution. Our results showed that the inclusion of the boundaries also had effects on the topology of the magnetic fields and on the MCG inverse solution accuracy.

• 社団法人電子情報通信学会の論文
• 2000-08-25

著者

• Kang Yoon-myung

  Mec Laboratory Daikin Industries Limited

• Niki Noboru

  The Faculty Of Engineering Tokushima University

• Nakaya Y

  Department Of Nutrition School Of Medicine The University Of Tokushima

• CHEN Jiange

  the Faculty of Engineering, Tokushima University

• NAKAYA Yutaka

  Medical School, Tokushima University

• NISHITANI Hiromu

  Medical School, Tokushima University

• Nakaya Yutaka

  Medical School Tokushima University

• Chen Jiange

  The Faculty Of Engineering Tokushima University

• Nishitani Hiromu

  Medical School Tokushima University

• NISHITANI Hiromu

  Medical School of Tokushima

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