Images by Nuclear Magnetic Resonance: A Modified Version of the EPI Method

Autor:	Waldemar Wolney Filho, Simone Souza Ramalho, Nilson Mendes Borges
Rok vydání:	2001
Předmět:	Physics Sequence medicine.diagnostic_test Physics::Medical Physics Phase (waves) General Physics and Astronomy Magnetic resonance imaging Iterative reconstruction Single excitation Sample (graphics) Nuclear magnetic resonance Encoding (memory) medicine Ghosting
Zdroj:	Brazilian Journal of Physics, Volume: 31, Issue: 2, Pages: 308-316, Published: JUN 2001 Brazilian Journal of Physics v.31 n.2 2001 Brazilian Journal of Physics Sociedade Brasileira de Física (SBF) instacron:SBF
ISSN:	0103-9733
DOI:	10.1590/s0103-97332001000200025
Popis:	It is well known that data accquisition times and image reconstruction procedures in conventional magnetic resonance imaging (MRI) are usually long. For time dependent phenomena, such as sample motion, respiration, blood flow pulsation and others, faster accquision times are desirable to avoid ghosting artifacts. Over the last two decades, a great number of fast and ultra-fast MRI methods have been proposed that greatly reduce the accquision times. One of them is the echo-planar imaging (EPI) method which uses a single excitation scheme to scan entirely the k-space in a very short time. In the initial sections of this work we will supply the reader with a brief description of the image reconstruction procedures for the conventional MRI sequence and four different schemes of the EPI method. However, our main objective is to propose a modified version of the spin-echo EPI method, suggesting a sequence with the use of a constant phase encoding gradient.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f77bb2182c5388dc323ced992f749f56 https://doi.org/10.1590/s0103-97332001000200025 Zobrazit plný text záznamu