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Titolo:
Double-shot magnetic resonance imaging of cerebral lesions: Fast spin-echoversus echo planar sequences
Autore:
Wolansky, LJ; Sheth, MP; Axen, R; Prasad, V;
Indirizzi:
Univ Med & Dent New Jersey, New Jersey Med Sch, Dept Radiol, Newark, NJ 07103 USA Univ Med & Dent New Jersey Newark NJ USA 07103 diol, Newark, NJ 07103 USA
Titolo Testata:
JOURNAL OF NEUROIMAGING
fascicolo: 3, volume: 10, anno: 2000,
pagine: 131 - 137
SICI:
1051-2284(200007)10:3<131:DMRIOC>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
MULTIPLE-SCLEROSIS; HASTE MR; BRAIN;
Keywords:
MRI; cerebral lesions; echo planar imaging;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Wolansky, LJ Univ Med & Dent New Jersey, New Jersey Med Sch, Dept Radiol, UH-C320,150 Bergen St, Newark, NJ 07103 USA Univ Med & Dent New Jersey UH-C320,150 Bergen St Newark NJ USA 07103
Citazione:
L.J. Wolansky et al., "Double-shot magnetic resonance imaging of cerebral lesions: Fast spin-echoversus echo planar sequences", J NEUROIMAG, 10(3), 2000, pp. 131-137

Abstract

The authors compared two new rapid MRI techniques: double-shot echo-planarimaging (DS-EPI) versus double-shot fast spin-echo (DS-FSE) in the evaluation of cerebral lesions. The authors examined 35 patients with 37 lesions, which were hyperintense on long TR images. Patients were scanned with both DS-EPI and DS-FSE with a time of repetition (TR) of 10,000 milliseconds andan echo time (TE) of 80 milliseconds. Conspicuity was determined from region of interest measurements to calculate contrast to noise ratio (C/N). Visual comparisons between DS-EPI and DS-FSE, and between DS-EPI and T2-weighted conventional spin-echo (CSE) were also performed to evaluate the sequences' ability to depict hemorrhage. The mean C/N for both sequences was comparable: 36.7 for DS-FSE and 35.6 for DS-EPI, with no statistically significant difference (p = 0.77). With regards to depicting blood products, DS-EPI proved far more effective than DS-FSE and comparable to CSE. Also, DS-EPI proved to be more time-efficient, requiring 1.67 seconds per section, while DS-FSE required 3.33 seconds per section. Whereas DS-FSE and DS-EPI are comparable in their ability to depict hyperintense cerebral pathology, DS-EPI is more time-efficient, and therefore appears preferable. Because of the high magnetic susceptibility of DS-EPI, geometric distortion degrades visualization of lesions in the posterior fossa or near the sinuses. On the other hand, the high magnetic susceptibility results in high conspicuity of bloodproducts.

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Documento generato il 02/06/20 alle ore 01:52:08