Magnetic resonance system and method for determining a diffusion-weighted image
AssigneeSiemens Aktiengesellschaft
InventorMichael Zwanger
Life of this patent
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Abstract
In a method for determination of a diffusion-weighted image of an examination subject in a magnetic resonance system, a diffusion-weighted data set is acquired with magnetic diffusion gradients being activated; a diffusion-weighted image of the examination subject is calculated using this diffusion-weighted data set; dephasing or spoiler gradients are activated in order to reduce artifacts in the diffusion-weighted image due to additional signal echoes and the position and/or amplitude and/or polarity of the dephasing gradients is/are selected dependent on the diffusion gradients.
Claims15
A method for determining a diffusion-weighted magnetic resonance image of an examination subject, comprising the steps of:
- exposing an examination subject in a magnetic resonance system to a pulse sequence, including activating magnetic diffusion gradients and activating artifact-reducing gradients selected from the group consisting of dephasing gradients and spoiler gradients, to acquire a diffusion-weighted magnetic resonance data set from the examination subject;
- calculating a diffusion-weighted image of the examination subject from the diffusion weighted magnetic resonance data set;
- and
- setting at least one characteristic selected from the group consisting of a position of said artifact-reducing gradients, an amplitude of said artifact-reducing gradients, and a polarity of said artifact-reducing gradients, dependent on said magnetic diffusion gradients to reduce artifacts in said diffusion-weighted image due to additional signal echoes produced by said artifact-reducing reducing gradients.
A magnetic resonance system comprising:
- a magnetic resonance scanner configured to interact with an examination subject;
- a control unit connected to said magnetic resonance scanner to operate said magnetic resonance scanner to expose said examination subject to a pulse sequence, by activating magnetic diffusion gradients and activating artifact-reducing gradients selected from the group consisting of dephasing gradients and spoiler gradients, to acquire a diffusion-weighted magnetic resonance data set from the examination subject;
- an image computer supplied with said diffusion-weighted magnetic resonance data set that calculates a diffusion-weighted image of the examination subject from the diffusion weighted magnetic resonance data set;
- and
- said control unit setting at least one characteristic selected from the group consisting of a position of said artifact-reducing gradients, an amplitude of said artifact-reducing gradients, and a polarity of said artifact-reducing gradients, dependent on said magnetic diffusion gradients to reduce artifacts in said diffusion-weighted image due to additional signal echoes produced by said artifact-reducing gradients.
Dependencies are inferred from the claim text.