Koninklijke Philips Corporation N.V.

Philips Intellectual Property & Standards Gmbh

Philips Gmbh

Gwenael Henri Herigault

Arjan Willem Simonetti

Peter Boernert

Miha Fuderer

Tim Nielsen

Gabriele Marianne Beck

Zhaolin Chen

Elizabeth Anne Moore

Kim Van De Ven

Mathijs Visser

At least a portion of a body () is placed in a main magnetic field Bo within the examination volume of a MR device. The portion of the body () is subject to an imaging sequence including one or more RF pulses and switched magnetic field gradients to acquire imaging signals. The portion of the body () is subject to a navigator sequence applied at least once before, during, or after the imaging sequence. The navigator sequence includes one or more RF pulses and switched magnetic field gradients controlled to acquire navigator signals with a single-point or multi-point Dixon technique. Translation and/or rotation and/or shear data reflecting motion of the body are derived from the navigator signals during the acquisition of the imaging signals. The translation and/or rotation and/or shear data are used for adapting the imaging sequence and/or for motion correction during reconstruction of an MR image.

MRI with motion correction using navigators acquired using a dixon technique

An object () in an examination volume of a MR device () is imaged with improved susceptibility weighted contrast. The imaging includes the steps of: a) generating at least two echo signals at different echo times by subjecting the object () to an imaging sequence of RF pulses and switched magnetic field gradients; b) acquiring the echo signals; c) repeating steps a) and b) for a plurality of phase encoding steps; d) reconstructing an intermediate MR image for each echo time from the acquired echo signals; and e) generating a susceptibility weighted MR image by computing, for each voxel of the susceptibility weighted MR image, a non-linear combination of the voxel values of the intermediate MR images at the respective image position. The non-linear combination emphasizes lower voxel magnitude values more than higher voxel magnitude values.

MR imaging with enhanced susceptibility contrast

At least a portion of a body () of a patient positioned in an examination volume of a MR device (). A portion of the body () is subject to a calibration sequence including RF pulses and switched magnetic field gradients controlled in such a manner that a calibration signal data set is acquired by a multi-point Dixon technique at a first image resolution. Calibration parameters are derived from the calibration signal data set. The MR device () is controlled according to the derived calibration parameters. The portion of the body () is subject to an imaging sequence including RF pulses and switched magnetic field gradients controlled in such a manner that a diagnostic signal data set is acquired at a second image resolution which is higher than the first image resolution. A diagnostic MR image is reconstructed from the diagnostic signal data set.

MR imaging using a multi-point dixon technique

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Eindhoven, Netherlands

Gwenael Henri Herigault