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Titolo:
QUANTIFICATION AND REDUCTION OF GHOSTING ARTIFACTS IN INTERLEAVED ECHO-PLANAR IMAGING
Autore:
REEDER SB; ATALAR E; BOLSTER BD; MCVEIGH ER;
Indirizzi:
JOHNS HOPKINS UNIV,SCH MED,425 TRAYLOR BLDG,720 RUTLAND AVE BALTIMOREMD 21205 JOHNS HOPKINS UNIV,SCH MED BALTIMORE MD 21205
Titolo Testata:
Magnetic resonance in medicine
fascicolo: 3, volume: 38, anno: 1997,
pagine: 429 - 439
SICI:
0740-3194(1997)38:3<429:QAROGA>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
GRADIENT-ECHO; RESONANCE; RECONSTRUCTION; PERFUSION; ERRORS;
Keywords:
MRI; ARTIFACTS; RECONSTRUCTION; EPI; FUNCTIONAL IMAGING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
S.B. Reeder et al., "QUANTIFICATION AND REDUCTION OF GHOSTING ARTIFACTS IN INTERLEAVED ECHO-PLANAR IMAGING", Magnetic resonance in medicine, 38(3), 1997, pp. 429-439

Abstract

A mathematical analysis of ghosting artifacts often seen in interleaved echo-planar images (EPI) is presented. These artifacts result from phase and amplitude discontinuities between lines of k-space in the phase-encoding direction, and timing misregistrations from system filterdelays. Phase offsets and time delays are often measured using ''reference'' scans, to reduce ghosting through postprocessing. From the expressions describing ghosting artifacts, criteria were established for reducing ghosting to acceptable levels. Subsequently, the signal-to-noise ratio (SNR) requirements for estimation of time delays acid phase offsets, determined from reference scans, was evaluated to establish the effect of estimation error on artifact reduction for interleaved EPI, Artifacts resulting from these effects can be reduced to very low levels when appropriate reference scan estimation is used. This has important implications for functional MRI (fMRI) and applications involving small changes in signal intensity.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 13:43:34