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Titolo:
THE EFFECT OF HIGH-PERFORMANCE GRADIENTS ON FAST GRADIENT-ECHO IMAGING
Autore:
REEDER SB; MCVEIGH ER;
Indirizzi:
JOHNS HOPKINS UNIV,SCH MED,DEPT BIOMED ENGN & RADIOL,MED IMAGING LAB,407 TRAYLOR BLDG BALTIMORE MD 21205 JOHNS HOPKINS UNIV,SCH MED,DEPT BIOMED ENGN & RADIOL,MED IMAGING LAB BALTIMORE MD 21205
Titolo Testata:
Magnetic resonance in medicine
fascicolo: 5, volume: 32, anno: 1994,
pagine: 612 - 621
SICI:
0740-3194(1994)32:5<612:TEOHGO>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIC-RESONANCE; BREATH-HOLD; MRI; MYOCARDIUM; SEQUENCES; NOISE;
Keywords:
OPTIMIZATION; MRI; SNR; GRADIENT COILS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
S.B. Reeder e E.R. Mcveigh, "THE EFFECT OF HIGH-PERFORMANCE GRADIENTS ON FAST GRADIENT-ECHO IMAGING", Magnetic resonance in medicine, 32(5), 1994, pp. 612-621

Abstract

The effect of gradient system performance on segmented k-space gradient echo imaging is presented. Three cases were investigated. First, anideal system that has infinite slew rates and unlimited maximum gradient strengths was considered. Second, a ''high speed'' imaging system (2.3 (G/cm), 23 (G/cm)/ms) was considered. These two cases were compared with a ''conventional'' imaging system (1 (G/cm), 1.67 (G/cm)/ms). It was found that substantial increases in SNR can be achieved (approximate to 45%) by using high speed versus a conventional gradient system, for a TR of 6 ms. For trapezoidal gradient waveforms, there exists an optimum maximum gradient strength for a given slew rate, and any increase in gradient strength above this optimum will not be utilized byan optimized sequence. These studies have shown that increasing TR without decreasing the bandwidth is not a good way to increase SNR for constant scan time.

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Documento generato il 27/11/20 alle ore 13:57:34