U.S. Philips Corporation

Markus B Scheidegger

Klaas P Pruessmann

Peter Boesiger

Peter Bosiger

Markus Weiger

Matthias Stuber

Xavier G Golay

The invention relates to a method for obtaining images by means of magnetic resonance (MR) of an object placed in a static magnetic field which method includes simultaneous measurement of a number sets of MR signals by application gradients and an array of receiver coils, reconstruction of a number of receiver coil images from the sets MR signals measured and reconstruction of a final image from a distant dependent sensitivity of the receiver coils and the first plurality of receiver coil images. In order to reduce the acquisition time the number of phase encoding steps corresponding to the phase-encoding gradient is reduced with a reduction factor compared to standard Fourier imaging, while a same field of view is maintained as in standard Fourier imaging. In this way fast cardiac imaging may be possible. According to the invention the calculation of complicated matrix inversion can be simplified by determining of an image vector of the final image from a combination of a generalized inverse of a sensitivity matrix and a receiver coil image vector. In this way aliasing artifacts in the final image are reduced. Furthermore, the reconstruction method enables application of non integer reduction factors.

Magnetic resonance imaging method and apparatus

The invention relates to a magnetic resonance method for determining a perfusion image of a portion, which method comprises the following steps: generation of a control pulse sequence in a first portion of the body and measurement of a control data set by generation of an MR-image sequence for imaging of an third portion of the body, generation of a labelling pulse sequence in a second portion of the body wherein a fluid flows towards the third portion, and measurement of the labelled data set by generation of the MR-image sequence for imaging the third portion of the body, and reconstruction of the perfusion image of the fluid in a mass of the third portion of the body from a combination of the control data set and the labelled data set. In order to reduce the geometric restrictions and compensate magnetic transfer effects, the labelling pulse sequence comprises a first selective RF pulse and a second RF pulse, the control pulse sequence comprises the first selective RF pulse and a third RF pulse, a phase of the second RF pulse being opposite to that of the third RF pulse.

Method and device for generating a perfusion image of a body portion using magnetic resonance imaging

A magnetic resonance imaging method for high quality short echo time imaging uses FID-acquired-echoes. Gradient recalled echoes are excited in two short echo time acquisition sequences having opposite polarity reading gradients. Half-echoes for corresponding phase encoding steps are concatenated to reconstructed echoes. An image is reconstructed from the reconstructed echoes using a Fourier transform reconstruction method. With the method artefact free high quality images with echo times below 4 msec can be obtained, even under unfavorable conditions, such as fast blood flow.

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Bisikon, Switzerland

Markus B Scheidegger