Sebastian Littin1, Daniel Gallichan2, Anna Masako Welz3, Feng Jia3, Andrew Dewdney4, Hans Weber3, Gerrit Schultz3, Jürgen Hennig3, Maxim Zaitsev3. 1. Department of Diagnostic Radiology, Medical Physics, University Medical Center Freiburg, Breisacher Str. 60a, 79106, Freiburg, Germany. sebastian.littin@uniklinik-freiburg.de. 2. CIBM, EPFL, Lausanne, Switzerland. 3. Department of Diagnostic Radiology, Medical Physics, University Medical Center Freiburg, Breisacher Str. 60a, 79106, Freiburg, Germany. 4. Healthcare Sector, Siemens AG, Erlangen, Germany.
Abstract
OBJECT: In this paper we present a monoplanar gradient system capable of imaging a volume comparable with that covered by linear gradient systems. Such a system has been designed and implemented. MATERIALS AND METHODS: Building such a system was made possible by relaxing the constraint of global linearity and replacing it with a requirement for local orthogonality. A framework was derived for optimization of local orthogonality within the physical boundaries and geometric constraints. Spatial encoding of magnetic fields was optimized for their local orthogonality over a large field of view. RESULTS: A coil design consisting of straight wire segments was optimized, implemented, and integrated into a 3T human scanner to show the feasibility of this approach. Initial MR images are shown and further applications of the derived optimization method and the nonlinear planar gradient system are discussed. CONCLUSION: Encoding fields generated by the prototype encoding system were shown to be locally orthogonal and able to encode a cylindrical volume sufficient for some abdomen imaging applications for humans.
OBJECT: In this paper we present a monoplanar gradient system capable of imaging a volume comparable with that covered by linear gradient systems. Such a system has been designed and implemented. MATERIALS AND METHODS: Building such a system was made possible by relaxing the constraint of global linearity and replacing it with a requirement for local orthogonality. A framework was derived for optimization of local orthogonality within the physical boundaries and geometric constraints. Spatial encoding of magnetic fields was optimized for their local orthogonality over a large field of view. RESULTS: A coil design consisting of straight wire segments was optimized, implemented, and integrated into a 3T human scanner to show the feasibility of this approach. Initial MR images are shown and further applications of the derived optimization method and the nonlinear planar gradient system are discussed. CONCLUSION: Encoding fields generated by the prototype encoding system were shown to be locally orthogonal and able to encode a cylindrical volume sufficient for some abdomen imaging applications for humans.
Authors: Walter R T Witschey; Chris A Cocosco; Daniel Gallichan; Gerrit Schultz; Hans Weber; Anna Welz; Jürgen Hennig; Maxim Zaitsev Journal: Magn Reson Med Date: 2011-11-29 Impact factor: 4.668
Authors: Gerrit Schultz; Peter Ullmann; Heinrich Lehr; Anna M Welz; Jürgen Hennig; Maxim Zaitsev Journal: Magn Reson Med Date: 2010-09-16 Impact factor: 4.668
Authors: Andrey V Demyanenko; Lin Zhao; Yun Kee; Shuyi Nie; Scott E Fraser; J Michael Tyszka Journal: J Magn Reson Date: 2009-06-02 Impact factor: 2.229
Authors: William B Handler; Chad T Harris; Timothy J Scholl; Dennis L Parker; K Craig Goodrich; Brian Dalrymple; Frank Van Sass; Blaine A Chronik Journal: J Magn Reson Imaging Date: 2013-10-09 Impact factor: 4.813
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: Walter Rt Witschey; Sebastian Littin; Chris A Cocosco; Daniel Gallichan; Gerrit Schultz; Hans Weber; Anna Welz; Jürgen Hennig; Maxim Zaitsev Journal: Magn Reson Med Date: 2013-02-25 Impact factor: 4.668
Authors: Daniel Gallichan; Chris A Cocosco; Gerrit Schultz; Hans Weber; Anna M Welz; Jürgen Hennig; Maxim Zaitsev Journal: MAGMA Date: 2012-04-07 Impact factor: 2.310
Authors: Feng Jia; Gerrit Schultz; Frederik Testud; Anna Masako Welz; Hans Weber; Sebastian Littin; Huijun Yu; Jürgen Hennig; Maxim Zaitsev Journal: MAGMA Date: 2015-12-14 Impact factor: 2.310