| Design of biplanar gradient coils for magnetic resonance imaging of the human torso and limbs. | |
| | |
MedLine Citation:
|
PMID: 10372528 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
A method is described for design of gradient coils of unconventional geometry for MRI that is based on the superpositions of magnetic fields arising from individual current elements calculated by the Biot-Savart Law. Use of an optimization method based on a genetic algorithm enables a wide diversity in the shapes of coil that can be modeled. To exemplify this a two axis, biplanar gradient set is presented; this geometry offers good access for rectangular objects whilst holding the coils closer to the region of interest than is possible for cylindrical configurations. The inner dimensions of the gradient set were 40.0 x 24.4 x 40.0 cm and the gradient efficiencies were 0.3 and 0.4 mT m(-1) A(-1) in the z- and y- directions respectively over a 15 cm diameter region. Correction of signals arising from regions for which gradient linearity was not optimized was successful for the monotonic region within the set; the largest cuboid from which the MR signal could be processed to produce an undistorted image is of dimensions 36.3 x 17.2 x 24.4 cm. |
| | |
Authors:
|
G B Williams; B J Fisher; C L Huang; T A Carpenter; L D Hall |
Related Documents
:
|
3258708 - Mr imaging of avascular necrosis of the femoral head: value of small-field-of-view sagi... 17282528 - Finite-element electromagnetic simulation of a volume resonator coil for mr neuroimaging. 22503458 - In vitro characterization of [(18)f]-florbetaben, an aβ imaging radiotracer. 17271888 - Novel double-turn loop probe for intravascular mri. 17405618 - Oro-facio-digital syndrome type 1: imaging findings in an 11-year-old girl. 10352598 - Acute pancreatitis: interobserver agreement and correlation of ct and mr cholangiopancr... |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Magnetic resonance imaging Volume: 17 ISSN: 0730-725X ISO Abbreviation: Magn Reson Imaging Publication Date: 1999 Jun |
Date Detail:
|
Created Date: 1999-09-14 Completed Date: 1999-09-14 Revised Date: 2006-11-15 |
Medline Journal Info:
|
Nlm Unique ID: 8214883 Medline TA: Magn Reson Imaging Country: UNITED STATES |
Other Details:
|
Languages: eng Pagination: 739-54 Citation Subset: IM |
Affiliation:
|
Herchel Smith Laboratory for Medicinal Chemistry, University of Cambridge School of Clinical Medicine, England, UK. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Algorithms Equipment Design Humans Image Enhancement Magnetic Resonance Imaging / instrumentation* Magnetics* Models, Genetic Models, Theoretical Surface Properties |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Correlation between MRI and clinico-pathological manifestations in Lewis rats protected from experim...
Next Document: In vivo proton magnetic resonance spectroscopy of diseased prostate: spectroscopic features of malig...