Koninklijke Philips Corporation N.v.

University of Texas System

Ivan Dimitrov

Peter Boernert

Miha Fuderer

Ivan Pedrosa

Ananth Madhuranthakam

The invention provides for a magnetic resonance imaging system () comprising: a radio-frequency system ('&#x2033;) for acquiring magnetic resonance data () from an imaging zone (), wherein the radio-frequency system comprises multiple antenna elements (&#x2032;&#x2033;); a memory () containing machine executable instructions () and pulse sequence commands (), wherein the pulse sequence commands cause the processor to acquire magnetic resonance data from the multiple antenna elements according to a SENSE protocol; and a processor. Execution of the machine executable instructions causes the processor to: control () the magnetic resonance imaging system with the pulse sequence commands to acquire the magnetic resonance data; reconstruct () a preliminary image () using the magnetic resonance imaging data; calculate () a fit () between an anatomical model () and the preliminary image, wherein the anatomical model comprises a motion likelihood map (); identify () at least one image artifact origin () at least partially using the motion likelihood map and the fit; determine () an extended SENSE equation () at least partially using at least one image artifact origin; and construct () a corrected SENSE image () using the extended SENSE equation.

Removal of image artifacts in sense-MRI

A guide map is created for use in placing a spectroscopic single voxel in a region of interest in single voxel magnetic resonance spectroscopy. An anatomical planning image of the region of interest is obtained through MRI. As a spectroscopy voxel is stepped across the region of interest, characteristics of the magnetic field used in the MRI are measured at each location of the imaging voxel, and a guide-FWHM map indicative of the homogeneity/inhomogeneity of the magnetic field over the region of interest is derived using the measurements. The guide map is created by overlaying the guide-FWHM map on the anatomical planning image. A spectroscopic single voxel of a size corresponding to that of the spectroscopy voxel is placed within the region of interest as per the guide map. Then spectral data is acquired from the region of interest confined to the single voxel.

Imaging system for single voxel spectroscopy

A magnetic resonance imaging (MRI) system (), the system includes at least one controller () which performs a modified rotated slab excitation (mROSE) sequence for volume selection to exclude portions of a subject under exam which are within the scanning volume and outside of a field-of-view (FOV) so as to reduce foldover artifacts which originate from the excluded portions of the subject under exam, where the mROSE sequence performs volume excitation based upon either optimized symmetrical, minimum-phase, or stretched minimum-phase radio-frequency (RF) pulses in a sagittal plane and encodes the scanning volume in a coronal plane. The controller also performs a chemical-shift sequence including a modified DIXON (mDIXON) sequence for substantially uniform fat/water separation within a FOV which lies within the scanning volume; and/or acquires echo information for reconstructing at least a part of an image.

Growing community of inventors

Eindhoven, Netherlands

Ivan Dimitrov