A method of controlling a magnetic resonance imaging (MRI) apparatus including performing, by the MRI apparatus, blipped-controlled aliasing parallel imaging (blipped-CAIPI) obtaining k-space data on a subject determining a phase error of a chemical shift component, wherein the phase error of the chemical shift component is proportional to a geometric error based on a resonant frequency difference between a main component and the chemical shift component in the subject comparing the k-space data with data in which the phase error of the chemical shift component is reflected, wherein the data in which the phase error of the chemical shift component is reflected is associated with data on the main component and data on the chemical shift component and determining final data for image restoration based on a result of the comparison.

A system and method for magnetic resonance imaging is provided. The method includes dividing k-space into a plurality of regions along a dividing direction; scanning an object using a plurality of sampling sequences; acquiring a plurality of groups of data lines; filling the plurality of groups of data lines into the plurality of regions of the k-space; and reconstructing an image based on the filled k-space.

A medical system including a memory storing machine executable instructions is disclosed. The medical system also includes a computational system. The execution of the machine executable instructions causes the computational system to receive k-space data descriptive of a region of interest of a subject. The k-space data are acquired using a magnetic resonance fingerprinting pulse sequence configured for encoding chemical shifts. The execution of the machine executable instructions also causes the computational system to receive fat peak weights descriptive of a magnetic resonance fat spectrum. The fat peak weights are matched to a pulse train of the magnetic resonance fingerprinting pulse sequence. The execution of the machine executable instructions also causes the computational system to reconstruct a quantitative magnetic resonance image from the k-space data and the fat peak weights.

Provided are a magnetic resonance chemical-shift-encoded imaging method, apparatus, and device, belonging to the technical field of magnetic resonance imaging. The method comprises: in a phasor-error plot established on the basis of a two-point magnetic resonance signal model, determining to be an initial seed point a pixel having a unique phasor and causing said plot to reach a minimal local value; according to the initial seed point, estimating the phasor value of a to-be-estimated pixel to obtain a field map; mapping and merging the field map at the highest resolution to obtain a reconstructed field map; determining a reconstructed seed point from the reconstructed field map, and estimating the reconstructed seed point to obtain the phasor value of the reconstructed to-be-estimated pixel; according to the reconstructed seed point and the phasor value of the reconstructed to-be-estimated pixel, obtaining two separate images having predetermined components. In the method, a region simultaneously containing two components is identified as a seed point, eliminating the deviation caused by phasor-value jump at high resolution and ensuring the correctness of the seed point ultimately selected.

The present disclosure provides a method for determining an ultrasound focus location in a thermal image. In one aspect, the method includes obtaining a magnetic resonance thermal image of a tissue heated by a focused ultrasound and correcting a chemical shift and a k-space shift of a monitored ultrasound focus location in the magnetic resonance thermal image such that the monitored ultrasound focus location is aligned with a real physical ultrasound focus location. Correcting the chemical shift includes correcting a first spatial error of the monitored ultrasound focus location caused by resonance frequency changes of hydrogen nuclei due to environmental differences of water molecules. Correcting the k-space shift includes correcting a second spatial error of the monitored ultrasound focus location caused by temperature error due to spatial variations of a primary magnetic field.

Systems and methods for acquiring magnetic resonance images that accurately depict vascular calcifications, or other objects composed of magnetic susceptibility-shifted substances, in a subject are provided. The images are generally acquired using a pulse sequence that is designed to reduce physiological motion-induced artifacts and to mitigate chemical-shift artifacts from water-fat boundaries. Advantageously, the MRI technique described here suppresses chemical-shift artifacts without significantly reducing the signal intensity from fatty tissues, and thereby allows for more reliable visualization of vascular calcifications.

Methods and apparatus for processing magnetic resonance imaging (MRI) data to perform bone segmentation. MRI data comprising a set of gradient-echo images acquired throughout a spin echo is processed to generate a bone segmentation image. The bone segmentation image is generated based, at least in part, on at least two images in the set of gradient-echo images, wherein the at least two images include a first image corresponding to a beginning portion of the spin echo and a second image corresponding to a central portion of the spin echo.

A system and method is provided to acquire images of a subject having received a tissue soluble hyperpolarized gas into the airways. The method includes performing a pulse sequence including (i) for each effective repetition time (TReff), acquiring at least one gas-phase dataset and at least one dissolved-phase dataset, wherein a gas-phase echo time (TEGas) of the at least one gas-phase dataset and a dissolved-phase echo time (TEDissolved) of the at least one dissolved-phase dataset are selected to isolate gas-phase contamination of the dissolved-phase dataset from dissolved-phase components in the dissolved-phase dataset. The method also includes (ii) estimating gas-phase contamination of the dissolved-phase dataset using the gas-phase dataset and a scaling factor (), (iii) producing a corrected dissolved-phase dataset by reducing the gas-phase contamination of the dissolved-phase dataset using the gas-phase contamination estimated in step (ii), and reconstructing an image from the corrected dissolved-phase dataset and the gas-phase dataset.

Described herein are systems and methods for the selective mapping of water T1 relaxation times.

A method for providing at least one measurement by a magnetic resonance imaging (MRI) system of a tissue property or underlying tissue property in a region sufficiently close to a metal object, so that the metal object induces artifacts is provided. At least one magnetic resonance imaging signal from the region is acquired through the MRI system. The acquired at least one MRI signal is processed to correct for artifacts induced by the metal object. At least one tissue property or underlying tissue property measurement is extracted from the processed at least one MRI signal.