US 7,002,343 B2Granted

Method for determining a compensation setting for an eddy current field

AssigneeSiemens Aktiengesellschaft

InventorVolker Weissenberger

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Abstract

In a method for determining a compensation setting for an eddy current field that is caused by a temporally variable gradient field of a magnetic resonance apparatus, at least two magnetic resonance data sets arising from different spatial positions are generated using the gradient field, and from the magnetic resonance data sets, the compensation setting of a filter is calculated, with which a control quantity of the gradient field can be pre-distorted, such that the sum from the gradient field and at least one component of the eddy current field exhibits a desired time curve, and the gradient field used for the magnetic resonance data sets is generated with a predetermined initial setting of the filter that at least approximately takes into account the component of the eddy current field.

Claims12

Dependent claims

A method for determining a setting for compensating an eddy current field caused by a temporally variable gradient field in a magnetic resonance apparatus, comprising the steps of:

generating a gradient field in a magnetic resonance apparatus using an eddy current compensation filter and setting said eddy current compensation filter to an initial setting that at least approximately counts for a component of an eddy current field expected to arise in said magnetic resonance apparatus due to said gradient field;
using said gradient field, obtaining at least two preliminary magnetic resonance data sets respectively arising from different spatial positions in the magnetic resonance apparatus, with said eddy current field being inexactly compensated due to said initial setting;
from said magnetic resonance data sets, calculating a compensation setting for said eddy current compensation filter for more exactly compensating said eddy current field that causes a sum of the gradient field and said at least one component of the eddy current field to exhibit a selected time curve;
and
obtaining a diagnostic magnetic resonance data set by generating said gradient field with said filter at said compensation.

2 more elements

Dependencies are inferred from the claim text.