Use of measurements made in one echo train to correct...

Details Use of measurements made in one echo train to correct... Use of measurements made in one echo train to correct...

G - Physics

01

V

G01V 3/00 (2006.01)

Patent

CA 2563698

Estimates of ringing produced by short recovery pulse sequences (CPMG or modified CPMG) are used to improve the effects of ringing in a conventional CPMG or modified CPMG sequences. This is an effective method for removal of ringing when the ringing is varying over a time interval that would be spanned by a phase alternated pair of conventional sequences. By use of frequency dithering, ringing due to the excitation pulse and the refocusing pulses can be removed.

On utilise des estimations d'échos multiples résultant de brèves séquences d'impulsions de récupération (impulsions CPMG ou CPMG modifiées) pour corriger les effets des échos multiples dans des séquences CPMG classiques ou modifiées. Il s'agit d'un procédé efficace pour éliminer les échos multiples lorsque ce phénomène varie sur un intervalle de temps qui serait couvert par une paire de séquences classiques à alternance de phase. Le recours au tramage de fréquence permet d'éliminer les échos multiples dus à l'impulsion d'excitation et aux impulsions de refocalisation.

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