Reduced power selective excitation rf pulses

G - Physics – 01 – R

Patent

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G01R 33/32 (2006.01) G01N 24/08 (2006.01) G01R 33/48 (2006.01) G01R 33/483 (2006.01) G01R 33/54 (2006.01)

Patent

CA 2196216

A method far 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.

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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