A method for marking an entry position for an injection apparatus on a surface of a patient positioned inside a patient receiving region of a magnetic resonance device. The method includes providing a virtual entry position, introducing a marking apparatus into the patient receiving region, acquiring time-resolved MR image data from the marking apparatus by the magnetic resonance device, ascertaining a current position of the marking apparatus based on the time-resolved MR image data, iteratively changing the current position of the marking apparatus using the virtual entry position and the current position, and delivering the liquid from the marking apparatus when the current position matches the virtual entry position.

A method for tagged magnetic resonance imaging is disclosed. The method includes steps of tagging an object with polar tagging patterns; acquiring data in a spatial frequency domain of the tagged object with a polar sampling pattern; and reconstructing an image of the object through a polar Fourier transform of the data acquired in the step of acquiring data.

An MRI-based method for determining a velocity profile for a fluid flowing through a pipe, said method comprising: selecting a slice through which said fluid is flowing; selecting a pulse sequence; separating said pulse sequence into a preparation part and a readout part; applying said preparation part to said slice; waiting a predetermined time Rt; and, applying said readout part to said slice.

Provided is an MRI apparatus. In the MRI apparatus, a data collection unit repetitively performs a tag mode of applying an RF wave to at least an upstream portion of an imaging area to perform fluid labeling of a fluid flown into the imaging area and, after a lapse of an inversion time from application of the RF wave, performing magnetic resonance data collection, while changing the inversion time. An image reconstruction unit reconstructs a plurality of tag images corresponding to a plurality of different inversion times based on the magnetic resonance data collected in the tag mode. A reference image generation unit generates a reference image based on the plurality of the tag images. A fluid image generation unit generates a subtraction image between each of the tag images and the reference image as a fluid image.

Embodiments relate to a magnetic resonance imaging (MRI) technique in which the two-dimensional (2D) Displacement Encoding with Stimulated Echoes (DENSE) imaging technique and the multiband technique are combined to provide a 2D multi-slice quantitative assessment of displacement, deformation, and mechanics indices of tissue. The scan time is equivalent to the short scan time of the conventional single slice 2D imaging while providing spatial volumetric coverage similar to three-dimensional (3D) imaging. The techniques are combined in both the sequence (i.e., data acquisition) and reconstruction sides. Quantification of tissue displacement and motion is achieved through the combination and further evaluation of tissue mechanical properties is provided by calculating different indices based on the displacement and motion values.

Arterial spin labelling (ASL) MRI offers a non-invasive means to create blood-borne contrast in vivo for dynamic angiographic imaging. By spatial modulation of the ASL process it is possible to uniquely label individual arteries over a series of measurements, allowing each to be separately identified in the resulting images. This separation requires appropriate analysis for which a general framework has previously been proposed. Here the general framework is modified for fast analysis of non-invasive imaging of blood flow using vessel encoded arterial spin labelling (VE-ASL). This specifically addresses the issues of computational speed of the analysis and the robustness required to deal with real patient data. The modification applies various approaches for estimation of one or more parameters that change the way a vessel, for example an artery, is encoded to provide the fast analysis.

A method for measuring water exchange across the blood-brain barrier includes acquiring diffusion weighted (DW) arterial spin labeling (ASL) magnetic resonance imaging (MRI) signals. The method further includes determining optimal parameters to separate labeled water in capillary and brain tissue compartments. The method further includes estimating water exchange rate across the blood-brain barrier based on the DW ASL MRI signals and the optimal parameters, using a total generalized variation (TGV) regularized single-pass approximation (SPA) modeling algorithm.

A method for generating magnetic resonance images of a subject includes performing, using a magnetic resonance imaging (MRI) system, a magnetization preparation module to control tissue contrast for a region of interest in the subject. The method further includes after a predetermined period of time, performing, using the MRI system, a three dimensional (3D) unbalanced steady-state free precession (uSSFP) pulse sequence to acquire MR data from the region of interest in the subject. The 3D uSSFP pulse sequence is configured to suppress blood signal in the region of interest. The method further includes generating an image with blood signal suppression based on the acquired MR data.

In a magnetic resonance method and apparatus for determining a characteristic of an organ, a magnetic resonance sequence is executed in order to acquire temporally resolved magnetic resonance data pertaining to the organ. The magnetic resonance sequence includes at least one tagging module, which generates a sub-visual tag of the magnetic resonance data. The characteristic of the organ is determined in a processor using the sub-visual tag.

A magnetic resonance imaging method according to an embodiment includes performing a balanced SSFP sequence, repeatedly applies an excitation RF pulse to a subject at intervals of a repetition time and applies gradient magnetic field pulses balanced such that a time integral becomes zero within each interval of the repetition time, while further applying a spin labeling gradient magnetic field for generating one or more continuous spin labels within each interval of the repetition time.