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Design of small-scale gradient coils in magnetic resonance imaging by using the topology optimization method

Chinese Physics B 2018年第5期27卷 91-100页

作者：潘辉贾峰刘震宇 Maxim Zaitsev Juergen Hennig Jan G Korvink Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 China University of Chinese Academy of Sciences Beijing 100049 China Deptartment of Radiology Medical Physics Medical Center University of Freiburg Faculty of Medicine University of Freiburg Freiburg 79106 Germany Institute of Microstructure Technology Karlsruhe Institute of Technology (KIT) Karlsruhe 76344 Germany

A topology optimization method based on the solid isotropic material with penalization interpolation scheme is utilized for designing gradient coils for use in magnetic resonance microscopy. Unlike the popular stream function method, the proposed method has design variables that are the distribution of conductive material. A voltage-driven transverse gradient coil is proposed to be used as micro-scale magnetic resonance imaging（MRI） gradient coils, thus avoiding introducing a coil-winding pattern and simplifying the coil configuration. The proposed method avoids post-processing errors that occur when the continuous current density is approximated by discrete wires in the stream function approach. The feasibility and accuracy of the method are verified through designing the z-gradient and y-gradient coils on a cylindrical *** design results show that the proposed method can provide a new coil layout in a compact design space.

关键词： topology optimization method gradient coils solid isotropic material with penalization magnetic resonance imaging

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Accurate surface normal representation to facilitate gradient coil optimization on curved surface

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Magnetic Resonance Letters 2023年第1期3卷 67-84,I0004页

作者： Hao Ren Hui Pan Feng Jia Jan G.Korvink Zhenyu Liu Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun130033China School of Optoelectronics University of Chinese Academy of SciencesBeijing101499China Department of Radiology Medical PhysicsMedical Center University of FreiburgFaculty of MedicineUniversity of FreiburgFreiburg79110Germany Institute of Microstructure Technology Karlsruhe Institute of Technology(KIT)Karlsruhe76049Germany

The design methods for gradient coils are mostly based on discrete extrinsic methods(e.g.,the BioteSavart integration calculation),for which the surface normal vector strongly influences any numerical calculation of the discretized *** studies are mostly based on regular or analytical surfaces,which allow normal vectors to be expressed *** certain applications,design methods for extending currentcarrying surfaces from developable or analytic geometries to arbitrary surfaces generated from a scanned point cloud are *** key task is to correctly express the discretized normal vectors to ensure geometrical accuracy of the designed ***,it has been proven that applying a Delaunay triangulation to approximate a smooth surface can result in the discrete elemental normal vectors converging to those of the original ***,this article uses Delaunay triangulation to expand upon previous design methods so that they encompass arbitrary piecewise continuous *** design methods,the stream function and the so-called solid isotropic material with penalization(SIMP)method,are used to design circumvolute and noncircumvolute gradient coils on general surfaces.

关键词： gradient coils Delaunay triangulation Stream function SIMP method

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