A5017969855- Advanced MRI Techniques and Applications
- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Electric Motor Design and Analysis
- Particle Accelerators and Free-Electron Lasers
- Magnetic Properties of Alloys
- Scientific Research and Discoveries
- Superconductivity in MgB2 and Alloys
- Electromagnetic Scattering and Analysis
- Physics of Superconductivity and Magnetism
- Fusion materials and technologies
Columbus Superconductors (Italy)
2018
Esaote (Italy)
2003-2011
Abstract Magnetic Resonance Imaging (MRI) systems with magnetic field strengths higher than 7 Tesla (T), offer exceptional image resolution and signal-to-noise ratio, enabling more detailed visualization of fine anatomical structures, especially for brain, musculoskeletal, cardiovascular studies. Only a few them are operating in the whole world. An 11.74 T magnet human MRI has been commissioned at Gachon University Gil Medical Center (GUGMC) South Korea 2022 now exceeded two-year operational...
The need to optimize the magnet shape, size and region of homogeneity with respect anatomy patient is particularly strong in dedicated MRI design: cost weight are often determining factors for success market. An elongated coil geometry could be useful cases where scanner designed imaging non axisymmetric parts human body (e.g. extremities): this paper we present a fast design method based on Linear Programming (LP), which racetrack coils used magnetic field over an ellipsoidal region,...
The key factor for the success of dedicated magnetic resonance imaging systems on medical market is optimization magnet geometry with respect to anatomical region that has be scanned. This leads design compact structures which do not need whole body patient inserted inside cavity. A further step in this direction can made considering non axially symmetric volumes field homogeneity evaluation, more easily conformed most districts human (e.g. extremities). In paper an analysis electromagnet...
A novel 0.25 T permanent magnet device for dedicated Magnetic Resonance Imaging is presented. The main feature that the magnetic system connected to a support enabling rotation of entire structure perform patient examination under different weight bearing conditions. allows study particularly hidden (in standard horizontal position) pathologies spine and other districts (extremities) like knee. Main design challenges (due rotation) are here discussed. This represent first only attempt with...
A new 0.2 T magnetic structure for dedicated (extremities) Magnetic Resonance Imaging is presented. The main features are: circuit based on rare-earth permanent magnet material and iron, ergonomic double-height cavity shape (optimized to allow shoulder, legs joints examinations in a very compact with respect traditional whole body systems), special design of split pole plates improve field homogeneity reduce eddy current effects. typical (a few parts per million inside the imaging volume)...
The homogeneity of the magnetic field plays a fundamental role in MRI. Standard shimming techniques are usually applied on volumes such as spheres or (less frequently) surfaces revolution (oblate and prolate spheroids) based well-known solutions Laplace equation. We present complete mathematical formalism for solution equation with Dirichlet conditions defined tri-axial ellipsoid through transformation ellipsoidal coordinates. importance lies fact that this surface can be more easily...
The magnetic field, necessary for the plasma confinement in International Thermonuclear Experimental Reactor (ITER), Cadarache, France, is provided by 18 Toroidal Field Coils (TFC). In each coil, this field produced circulating a current of 68 kA through 4.5 km Nb3Sn cable-in-conduit superconductor, which assembled into mechanical structure capable withstanding huge Lorentz forces produced. Fusion Energy, European Domestic Agency ITER, responsible supply 10 TFC. This article gives an...
The discovery of superconductivity in MgB 2 gives the chance to study application magnet design conjunction with use cryocoolers. Central field and compactness conventional copper electromagnets iron yoke can be improved using superconducting materials. possibility is under investigation. A critical current density 1000 A/mm at 4.2K, self-field, considered a typical value for this material. Taking into account temperature magnetic dependence constructional packing factors we have more...
A fast and reliable 2D optimization method is presented for the shaping of pole plates an open MRI magnet. The shape determined by expanding profile in Fourier series: different methods have been analysed, starting from initial magnetic field homogeneity with flat pieces some results are given. extension this to real 3D corresponding case illustrated.