Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Spectroscopic MR imaging using the spread spectrum produced by oscillatinggradient fields
Autore:
Takaya, K;
Indirizzi:
Univ Saskatchewan, Dept Elect Engn, Saskatoon, SK S7N 5A9, Canada Univ Saskatchewan Saskatoon SK Canada S7N 5A9 skatoon, SK S7N 5A9, Canada
Titolo Testata:
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES
fascicolo: 3, volume: E84A, anno: 2001,
pagine: 875 - 883
SICI:
0916-8508(200103)E84A:3<875:SMIUTS>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
NMR;
Keywords:
spectroscopic MRI; chemical shift MRI; spread spectrum; frequency modulation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
--discip_EC--
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Takaya, K Univ Saskatchewan, Dept Elect Engn, 57 Campus Dr, Saskatoon, SK S7N 5A9, Canada Univ Saskatchewan 57 Campus Dr Saskatoon SK Canada S7N 5A9 anada
Citazione:
K. Takaya, "Spectroscopic MR imaging using the spread spectrum produced by oscillatinggradient fields", IEICE T FUN, E84A(3), 2001, pp. 875-883

Abstract

A chemical shift MR method which utilizes a oscillating gradient held is presented in this paper. Frequency modulation resulting from oscillating a gradient field spreads the spectrum that contains both chemical shift and spatial information, over a wide frequency range by using a large modulation factor in FM. The chemical shift spectrum resides within every frequency band segmented by the modulation frequency w(m). The spectral elements gathered from all such frequency segments for a chemical shift frequency contain the spatial image of that particular chemical shift frequency, despite the distortion introduced by a series of the Bessel functions acting as a pointspread function. A sum of several Bessel functions of the first kind J(n)(.) is used to approximate the deconvolution process, since the sum staggered with respect to n has a desirable peaking property useful in deconvolution. This leads to devise a new image reconstruction algorithm based on the simple moving average over the spatial coordinate for which the oscillating gradient is applied. Furthermore, the number of echo measurements necessaryfor an image size of N x N is reduced from N-2 of the spin echo chemical shift, imaging down to N by this method. Simulation results supporting the validity of this method are also presented in this paper.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 08:57:28