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Selection of multislice in nuclear magnetic resonance tomography. Selecao de multiplos planos em tomografia por ressonancia magnetica nuclear

Miscellaneous:

Abstract

The study and the implementation of three techniques for the selection of multislice, aiming the optimization of the NMR tomography is presented. The first technique uses the simultaneous excitation of multiple slices, being each plane encoded with a pre determined phase for a latter decodification of the information by the linear combination of n experiments. The second one makes use of the multislice simultaneous excitation, like the first one, but the slices are acquired in the presence of an oblique reading gradient, which provides us the multi slices signal without any further computer processing. The third technique uses frequency multiplexed excitation, that is, different slices are successively excited during the repetition time of an acquisition, making possible multislice acquisition at the same time of a single slice. The construction and the use of a phantom for the equipment characterization are discussed too. Many technical aspects necessary for an improvement of the tomography performance, like reception circuits and resonators, are discussed. A brief introduction to the gradient modulated adiabatic excitation (GMAX) technique and the first results ever obtained with it, using surface coils, is presented. (author).
Publication Date:
Jan 01, 1990
Product Type:
Miscellaneous
Reference Number:
AIX-24-074756; EDB-93-152533
Resource Relation:
Other Information: Tese (M.Sc.)
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; NUCLEAR MAGNETIC RESONANCE; COMPUTERIZED TOMOGRAPHY; ADIABATIC PROCESSES; COMPARATIVE EVALUATIONS; DIAGNOSIS; NMR IMAGING; OPTIMIZATION; PHANTOMS; DIAGNOSTIC TECHNIQUES; EVALUATION; MAGNETIC RESONANCE; MOCKUP; RESONANCE; STRUCTURAL MODELS; TOMOGRAPHY; 550602* - Medicine- External Radiation in Diagnostics- (1980-)
OSTI ID:
5956619
Research Organizations:
Sao Paulo Univ., Sao Carlos, SP (Brazil). Inst. de Fisica e Quimica
Country of Origin:
Brazil
Language:
Portuguese
Availability:
Available from the Nuclear Information Center of Comissao Nacional de Energia Nuclear, RJ (Brazil)
Submitting Site:
INIS
Size:
Pages: (155 p)
Announcement Date:

Miscellaneous:

Citation Formats

Frare, Junior, P L. Selection of multislice in nuclear magnetic resonance tomography. Selecao de multiplos planos em tomografia por ressonancia magnetica nuclear. Brazil: N. p., 1990. Web.
Frare, Junior, P L. Selection of multislice in nuclear magnetic resonance tomography. Selecao de multiplos planos em tomografia por ressonancia magnetica nuclear. Brazil.
Frare, Junior, P L. 1990. "Selection of multislice in nuclear magnetic resonance tomography. Selecao de multiplos planos em tomografia por ressonancia magnetica nuclear." Brazil.
@misc{etde_5956619,
title = {Selection of multislice in nuclear magnetic resonance tomography. Selecao de multiplos planos em tomografia por ressonancia magnetica nuclear}
author = {Frare, Junior, P L}
abstractNote = {The study and the implementation of three techniques for the selection of multislice, aiming the optimization of the NMR tomography is presented. The first technique uses the simultaneous excitation of multiple slices, being each plane encoded with a pre determined phase for a latter decodification of the information by the linear combination of n experiments. The second one makes use of the multislice simultaneous excitation, like the first one, but the slices are acquired in the presence of an oblique reading gradient, which provides us the multi slices signal without any further computer processing. The third technique uses frequency multiplexed excitation, that is, different slices are successively excited during the repetition time of an acquisition, making possible multislice acquisition at the same time of a single slice. The construction and the use of a phantom for the equipment characterization are discussed too. Many technical aspects necessary for an improvement of the tomography performance, like reception circuits and resonators, are discussed. A brief introduction to the gradient modulated adiabatic excitation (GMAX) technique and the first results ever obtained with it, using surface coils, is presented. (author).}
place = {Brazil}
year = {1990}
month = {Jan}
}