Patent Document ID: 20100052674
Application ID: 12461902
Patent Status: 0

Claim One:
1. A method for determining an attenuation map for use in positron emission tomography and for use of homogeneity information relating to the magnetic resonance magnetic field within the framework of a single magnetic resonance image recording, the method comprising: recording a first and a second image data record with a three-dimensional gradient echo sequence during a first and a second echo time, respectively, a phase difference between a water and a fat signal amounting to zero during the first echo time and amounting to 180° degrees during the second echo time; and determining the attenuation map from fat/water ratios obtained from the image data records by way of Dixon technology, all voxels with a signal intensity below a first threshold value being excluded at least for the second image data record by using a mask and only non-excluded voxels of the first and second image data record being taken into consideration in order to determine homogeneity information from phase differences of adjacent voxels.