Hongyan He1,2,3, Shufeng Wei1, Huixian Wang1, Wenhui Yang4,5. 1. Institute of Electrical of Engineering, Chinese Academy of Sciences, Beijing, 100190, China. 2. Chinese Academy of Sciences, Beijing, 100049, China. 3. School of Information and Electrical Engineering, Hebei University of Engineering, Handan, 056038, China. 4. Institute of Electrical of Engineering, Chinese Academy of Sciences, Beijing, 100190, China. yangwenh@mail.iee.ac.cn. 5. Chinese Academy of Sciences, Beijing, 100049, China. yangwenh@mail.iee.ac.cn.
Abstract
OBJECTIVE: The goal of this work is to analyze the influence of the distributions and dimensions of the coil elements and to present a method for improving the performance of the matrix gradient coil. METHODS: Three typical models (five structures in total) are presented, and a double-layer biplanar matrix gradient coil is used to install coil elements. Two metrics, namely, the role of coil elements and mutual inductance between coil elements, are proposed to assess the performance of coil systems. An optimization approach to design matrix gradient coils is introduced based on analyzing the distributions and dimensions of coil elements. The flexibility of the magnetic field generation of the designed coil structure is demonstrated by generating full third-order spherical harmonic fields and different oblique gradient fields. RESULTS: Matrix gradient coils with suitable distributions are capable of generating target magnetic fields. The role of coil elements quantitatively illustrates that the coil elements have different impacts on generating magnetic fields. Increasing the coil element dimension within a certain range can reduce the mutual inductance between coil elements and improve the performance of the coil system. The designed novel double-layer biplanar matrix gradient coil achieves an acceptable performance in generating different magnetic fields. CONCLUSIONS: The proposed metrics can provide theoretical support for designing matrix gradient coils and evaluating their performance. The role of coil elements contributes to analyzing the distributions of coil elements to decrease the number of coil elements and power amplifiers. The mutual inductance between coil elements can be a reference for designing the dimensions of coil elements.
OBJECTIVE: The goal of this work is to analyze the influence of the distributions and dimensions of the coil elements and to present a method for improving the performance of the matrix gradient coil. METHODS: Three typical models (five structures in total) are presented, and a double-layer biplanar matrix gradient coil is used to install coil elements. Two metrics, namely, the role of coil elements and mutual inductance between coil elements, are proposed to assess the performance of coil systems. An optimization approach to design matrix gradient coils is introduced based on analyzing the distributions and dimensions of coil elements. The flexibility of the magnetic field generation of the designed coil structure is demonstrated by generating full third-order spherical harmonic fields and different oblique gradient fields. RESULTS: Matrix gradient coils with suitable distributions are capable of generating target magnetic fields. The role of coil elements quantitatively illustrates that the coil elements have different impacts on generating magnetic fields. Increasing the coil element dimension within a certain range can reduce the mutual inductance between coil elements and improve the performance of the coil system. The designed novel double-layer biplanar matrix gradient coil achieves an acceptable performance in generating different magnetic fields. CONCLUSIONS: The proposed metrics can provide theoretical support for designing matrix gradient coils and evaluating their performance. The role of coil elements contributes to analyzing the distributions of coil elements to decrease the number of coil elements and power amplifiers. The mutual inductance between coil elements can be a reference for designing the dimensions of coil elements.
Authors: Christoph Juchem; Terence W Nixon; Scott McIntyre; Douglas L Rothman; Robin A de Graaf Journal: J Magn Reson Date: 2010-03-11 Impact factor: 2.229
Authors: Christoph Juchem; Peter B Brown; Terence W Nixon; Scott McIntyre; Douglas L Rothman; Robin A de Graaf Journal: Magn Reson Med Date: 2011-03-25 Impact factor: 4.668
Authors: Christoph Juchem; Terence W Nixon; Scott McIntyre; Vincent O Boer; Douglas L Rothman; Robin A de Graaf Journal: J Magn Reson Date: 2011-07-23 Impact factor: 2.229
Authors: Christoph Juchem; Peter Herman; Basavaraju G Sanganahalli; Peter B Brown; Scott McIntyre; Terence W Nixon; Dan Green; Fahmeed Hyder; Robin A de Graaf Journal: NMR Biomed Date: 2014-05-17 Impact factor: 4.044