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Titolo:
Contrast mechanisms in MR imaging
Autore:
Nitz, WR; Reimer, P;
Indirizzi:
Univ Regensburg Klinikum, Inst Rontgendiagnost, D-93042 Regensburg, Germany Univ Regensburg Klinikum Regensburg Germany D-93042 Regensburg, Germany Univ Munster, Dept Clin Radiol, D-48129 Munster, Germany Univ Munster Munster Germany D-48129 in Radiol, D-48129 Munster, Germany
Titolo Testata:
EUROPEAN RADIOLOGY
fascicolo: 6, volume: 9, anno: 1999,
pagine: 1032 - 1046
SICI:
0938-7994(1999)9:6<1032:CMIMI>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
FAST SPIN-ECHO; GRADIENT-ECHO; BRAIN; RELAXATION; RARE; SEQUENCES; DEPENDENCE; INVIVO; GRASE; NMR;
Keywords:
MR imaging; contrast mechanisms; proton density, T1, T2; spin echo; gradient echo; turbo spin echo; echo-planar imaging;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Nitz, WR Univ Regensburg Klinikum, Inst Rontgendiagnost, Franz-Josef-Str-Allee 11, D-93042 Regensburg, Germany Univ Regensburg Klinikum Franz-Josef-Str-Allee 11 Regensburg Germany D-93042
Citazione:
W.R. Nitz e P. Reimer, "Contrast mechanisms in MR imaging", EUR RADIOL, 9(6), 1999, pp. 1032-1046

Abstract

This paper is a brief introduction to tissue-specific parameters and the utilization of various MR imaging sequences to display these parameters in order to differentiate normal from pathologic tissue and function. The threedominant tissue-specific discussed are proton density, longitudinal time T1, and transverse relaxation time T2. For the utilization of gradient-echo sequences, transverse relaxation time T2* is introduced, more dependent on the environment or tissue interfaces than on the tissue itself. Another tissue-specific parameter is the concentration of macromolecules and their hydration layers as targeted with magnetization transfer imaging. Still another tissue-specific parameter is the chemical environment. Functional parameters that influence the contrast are diffusion, perfusion, flow, or motion. The sequence-related utilization of these tissue-specific parameters start with preparation as in spectral suppression of fat signal, relaxation-dependent elimination of fat or cerebrospinal fluid (CSF) signal, simple inversion magnetization transfer saturation, or diffusion Possible contrast mechanisms for the tissue-specific parameters are discussed for each of the commonly used sequences, whether of spin-echo type or of gradient-echo type, with or without magnetization preparation, conventional single-echo acquisition, or contemporary multiecho acquisition.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 15:18:41