A new design for a three-channel surface gradient coil employing a three-dimensional finite element model. 1996

F Shi, and L L Latour, and R Ludwig, and C H Sotak
Department of Electrical and Computer Engineering (F.S., R.L.) and Biomedical Engineering (L.L.L., C.H.S.), Worcester Polytechnic Institute, MA 01609, USA.

A new design of a three-channel surface gradient coil (SGC) is presented. The optimal objective of this design is to minimize parasitic field gradients by modifying the wire arrangement in the individual coils. A 3D finite element (FE) model is employed to analyze the SGC's field predictions. The numerical analysis results of the new SGC design indicate improved field behaviors when compared with those of a previously reported SGC designed by Cho and Yi (J. Magn. Reson. 94, 471-485 (1991)). To confirm the predicted improvement, two Gy (Y-axis) gradient coils, based on the old and new designs, have been constructed and installed in a General Electric CSI 2 Tesla MRI system with a 15-cm bore. Based on the resulting MR images, the new gradient coil configuration provides more uniform field gradients and less parasitic field gradients, which results in higher quality images than the previously reported SGC design. This paper also demonstrates the remarkable accuracy of the 3D FE simulation model.

UI MeSH Term Description Entries
D007091 Image Processing, Computer-Assisted A technique of inputting two-dimensional or three-dimensional images into a computer and then enhancing or analyzing the imagery into a form that is more useful to the human observer. Biomedical Image Processing,Computer-Assisted Image Processing,Digital Image Processing,Image Analysis, Computer-Assisted,Image Reconstruction,Medical Image Processing,Analysis, Computer-Assisted Image,Computer-Assisted Image Analysis,Computer Assisted Image Analysis,Computer Assisted Image Processing,Computer-Assisted Image Analyses,Image Analyses, Computer-Assisted,Image Analysis, Computer Assisted,Image Processing, Biomedical,Image Processing, Computer Assisted,Image Processing, Digital,Image Processing, Medical,Image Processings, Medical,Image Reconstructions,Medical Image Processings,Processing, Biomedical Image,Processing, Digital Image,Processing, Medical Image,Processings, Digital Image,Processings, Medical Image,Reconstruction, Image,Reconstructions, Image
D008279 Magnetic Resonance Imaging Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques. Chemical Shift Imaging,MR Tomography,MRI Scans,MRI, Functional,Magnetic Resonance Image,Magnetic Resonance Imaging, Functional,Magnetization Transfer Contrast Imaging,NMR Imaging,NMR Tomography,Tomography, NMR,Tomography, Proton Spin,fMRI,Functional Magnetic Resonance Imaging,Imaging, Chemical Shift,Proton Spin Tomography,Spin Echo Imaging,Steady-State Free Precession MRI,Tomography, MR,Zeugmatography,Chemical Shift Imagings,Echo Imaging, Spin,Echo Imagings, Spin,Functional MRI,Functional MRIs,Image, Magnetic Resonance,Imaging, Magnetic Resonance,Imaging, NMR,Imaging, Spin Echo,Imagings, Chemical Shift,Imagings, Spin Echo,MRI Scan,MRIs, Functional,Magnetic Resonance Images,Resonance Image, Magnetic,Scan, MRI,Scans, MRI,Shift Imaging, Chemical,Shift Imagings, Chemical,Spin Echo Imagings,Steady State Free Precession MRI
D003198 Computer Simulation Computer-based representation of physical systems and phenomena such as chemical processes. Computational Modeling,Computational Modelling,Computer Models,In silico Modeling,In silico Models,In silico Simulation,Models, Computer,Computerized Models,Computer Model,Computer Simulations,Computerized Model,In silico Model,Model, Computer,Model, Computerized,Model, In silico,Modeling, Computational,Modeling, In silico,Modelling, Computational,Simulation, Computer,Simulation, In silico,Simulations, Computer
D004867 Equipment Design Methods and patterns of fabricating machines and related hardware. Design, Equipment,Device Design,Medical Device Design,Design, Medical Device,Designs, Medical Device,Device Design, Medical,Device Designs, Medical,Medical Device Designs,Design, Device,Designs, Device,Designs, Equipment,Device Designs,Equipment Designs
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D019047 Phantoms, Imaging Devices or objects in various imaging techniques used to visualize or enhance visualization by simulating conditions encountered in the procedure. Phantoms are used very often in procedures employing or measuring x-irradiation or radioactive material to evaluate performance. Phantoms often have properties similar to human tissue. Water demonstrates absorbing properties similar to normal tissue, hence water-filled phantoms are used to map radiation levels. Phantoms are used also as teaching aids to simulate real conditions with x-ray or ultrasonic machines. (From Iturralde, Dictionary and Handbook of Nuclear Medicine and Clinical Imaging, 1990) Phantoms, Radiographic,Phantoms, Radiologic,Radiographic Phantoms,Radiologic Phantoms,Phantom, Radiographic,Phantom, Radiologic,Radiographic Phantom,Radiologic Phantom,Imaging Phantom,Imaging Phantoms,Phantom, Imaging

Related Publications

F Shi, and L L Latour, and R Ludwig, and C H Sotak
January 1988, Operative dentistry,
F Shi, and L L Latour, and R Ludwig, and C H Sotak
March 2021, The Review of scientific instruments,
F Shi, and L L Latour, and R Ludwig, and C H Sotak
August 2002, Journal of biomechanical engineering,
F Shi, and L L Latour, and R Ludwig, and C H Sotak
March 2007, Journal of the Optical Society of America. A, Optics, image science, and vision,
F Shi, and L L Latour, and R Ludwig, and C H Sotak
October 2021, Forces in mechanics,
F Shi, and L L Latour, and R Ludwig, and C H Sotak
January 2003, Journal of oral rehabilitation,
F Shi, and L L Latour, and R Ludwig, and C H Sotak
August 2017, Journal of magnetic resonance (San Diego, Calif. : 1997),
F Shi, and L L Latour, and R Ludwig, and C H Sotak
January 2010, Srpski arhiv za celokupno lekarstvo,
F Shi, and L L Latour, and R Ludwig, and C H Sotak
December 2007, Magma (New York, N.Y.),
F Shi, and L L Latour, and R Ludwig, and C H Sotak
October 2019, Sensors (Basel, Switzerland),
Copied contents to your clipboard!