Patent ID: 7091720
Filing Date: 2006-08-15
Classification: G01R

Abstract:
1. A method for avoiding peripheral interference signals when using a spin-echo pulse sequence for magnetic resonance tomography, comprising the steps of: placing a subject in a basic magnetic field having a homogenous volume adjoining a non-homogeneous volume; obtaining echo signals from the subject in said basic magnetic field using a spin-echo pulse sequence, including emitting a radio-frequency excitation pulse and, during said radio-frequency excitation pulse, activating a first slice selection gradient, and emitting a radio-frequency refocusing pulse and, during said radio-frequency refocusing pulse, activating a second slice selection gradient; and in said spin-echo sequence, employing a radio-frequency excitation pulse having an average frequency and a bandwidth that differ from an average frequency and a bandwidth of said radio-frequency refocusing pulse, and activating said first slice selection gradient with an amplitude g wherein R is the radius of the homogenous volume, r is a slice position of said transverse layer, and d is a thickness of said transverse excitation slice.