| Limitations of calculating field distributions and magnetic susceptibilities in MRI using a Fourier based method. | |
| | |
MedLine Citation:
|
PMID: 19182322 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
A discrete Fourier based method for calculating field distributions and local magnetic susceptibility in MRI is carefully studied. Simulations suggest that the method based on discrete Green's functions in both 2D and 3D spaces has less error than the method based on continuous Green's functions. The 2D field calculations require the correction of the 'Lorentz disk', which is similar to the Lorentz sphere term in the 3D case. A standard least-squares fit is proposed for the extraction of susceptibility for a single object from MR images. Simulations and a phantom study confirm both the discrete method and the feasibility of the least-squares fit approach. Finding accurate susceptibility values of local structures in the brain from MR images may be possible with this approach in the future. |
| | |
Authors:
|
Yu-Chung N Cheng; Jaladhar Neelavalli; E Mark Haacke |
Publication Detail:
|
Type: Journal Article; Research Support, N.I.H., Extramural Date: 2009-01-30 |
Journal Detail:
|
Title: Physics in medicine and biology Volume: 54 ISSN: 0031-9155 ISO Abbreviation: Phys Med Biol Publication Date: 2009 Mar |
Date Detail:
|
Created Date: 2009-02-10 Completed Date: 2009-06-03 Revised Date: 2011-09-26 |
Medline Journal Info:
|
Nlm Unique ID: 0401220 Medline TA: Phys Med Biol Country: England |
Other Details:
|
Languages: eng Pagination: 1169-89 Citation Subset: IM |
Affiliation:
|
Department of Radiology, Wayne State University, Detriot, MI, USA. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Fourier Analysis* Magnetic Resonance Imaging / adverse effects, methods* Magnetics* Models, Theoretical* Phantoms, Imaging |
| Grant Support | |
ID/Acronym/Agency:
|
HL062983-04A2/HL/NHLBI NIH HHS; R01 HL062983-04A2/HL/NHLBI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Ultra fast electromagnetic field computations for RF multi-transmit techniques in high field MRI.
Next Document: Simulation studies of a new 'OpenPET' geometry based on a quad unit of detector rings.