Koninklijke Philips Corporation N.V.

Philips Intellectual Property & Standards Gmbh

Philips Gmbh

Arjan Willem Simonetti

Gwenael Henri Herigault

Peter Boernert

Daniel Bystrov

Tim Nielsen

Harald Sepp Heese

Gabriele Marianne Beck

Johan Michiel Den Harder

Marc Kouwenhoven

Henri Gwenael Herigault

Wendy De Kok

Cornelis Johannes Franciscus Maria Bergmans

Mathijs Visser

Cornelis J F M Bergmans

Harald S Heese

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

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

At least a portion of a body () of a patient is positioned in an examination volume of a MR device (). The 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 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. The MR device () is operated according to the derived calibration parameters with fat saturation during acquisition of the diagnostic signal data set and/or during reconstruction of the diagnostic MR image.

A method of acquiring at least one clinical MRI image of a subject comprising the following steps: acquiring a first survey image with a first field of view, the first survey image having a first spatial resolution,&#x2014;locating a first region of interest and at least one anatomical landmarks in the first survey image, determining the position and the orientation of the first region of interest using the anatomical landmarks, the position and the orientation of the first region being used for&#x2014;planning a second survey image,&#x2014;acquiring the second survey image with a second field of view, the second survey image having a second spatial resolution, the second spatial resolution being higher than the first spatial resolution, generating a geometry planning for the anatomical region of interest using the second survey image,&#x2014;acquiring a diagnostic image of the anatomical region of interest using the geometry planning.

Automated sequential planning of MR scans

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Eindhoven, Netherlands

Arjan Willem Simonetti