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1. WO1996003665 - REDUCED POWER SELECTIVE EXCITATION RF PULSES

Publication Number WO/1996/003665
Publication Date 08.02.1996
International Application No. PCT/US1995/009454
International Filing Date 26.07.1995
Chapter 2 Demand Filed 27.02.1996
IPC
G01R 33/48 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
44using nuclear magnetic resonance
48NMR imaging systems
G01R 33/483 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
44using nuclear magnetic resonance
48NMR imaging systems
483with selection of signal or spectra from particular regions of the volume, e.g. in vivo spectroscopy
G01R 33/54 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
44using nuclear magnetic resonance
48NMR imaging systems
54Signal processing systems, e.g. using pulse sequences
CPC
G01R 33/446
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
44using nuclear magnetic resonance [NMR]
446Multifrequency selective RF pulses, e.g. multinuclear acquisition mode
G01R 33/4833
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
44using nuclear magnetic resonance [NMR]
48NMR imaging systems
483with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy
4833using spatially selective excitation of the volume of interest, e.g. selecting non-orthogonal or inclined slices
Applicants
  • SHINNAR, Meir [US/US]; US
Inventors
  • SHINNAR, Meir; US
Agents
  • ROCCI, Steven, J. ; Woodcock Washburn Kurtz Mackiewicz & Norris 46th floor One Liberty Place Philadelphia, PA 19103, US
Priority Data
08/282,22028.07.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) REDUCED POWER SELECTIVE EXCITATION RF PULSES
(FR) IMPULSIONS H.F. D'EXCITATION SELECTIVE A PUISSANCE REDUITE
Abstract
(EN)
A method for limiting the peak power and total energy of an input pulse without degrading the resulting excitation. This is accomplished by recognizing that the total energy of the pulse is encoded in the lowest order Fourier series coefficients of the frequency response and then specifying the total energy of the pulse as a design parameter to the RF pulse synthesis algorithm. Peak power of the pulse may also be limited by selecting the proper roots for the frequency response describing the magnetization in the z-direction.
(FR)
La présente invention concerne un procédé de limitation de la puissante de crête et de l'énergie totale d'une impulsion d'entrée sans dégradation de l'excitation résultante. Le procédé consiste à reconnaître que c'est avec les coefficients d'ordre inférieur de la série de Fourier qu'est codée la réponse en fréquence de l'énergie impulsionnelle totale, puis à spécifier l'énergie impulsionnelle totale sous forme d'un paramètre fondamental de l'algorithme de synthèse de l'impulsion H.F. Le choix de racines appropriées pour la réponse en fréquence décrivant la magnétisation selon l'axe z permet également de limiter la puissance impulsionnelle de crête.
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