# US 2025/0093447 A1 · Magnetic resonance imaging apparatus and control method for the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0093447 A1 - Document ID: US20250093447A1 - Status: Published application - Kind: A1 - Application number: 18/823,352 - Filed: 2024-09-03 - Published: 2025-03-20 - Earliest claimed: 2023-09-15 - Assignees: FUJIFILM Corporation - Applicants: FUJIFILM Corporation - Inventors: Suguru Yokosawa; Toru Shirai - Web page: https://patentgrep.com/patent/US20250093447A1 ## CPC - G01R 33/4824: {using a non-Cartesian trajectory} - G01R 33/4835: {of multiple slices} - G01R 33/5608: {Data processing and visualization specially adapted for MR, e.g. for feature analysis and pattern recognition on the basis of measured MR data, segmentation of measured MR data, edge contour detection on the basis of measured MR data, for enhancing measured MR data in terms of signal-to-noise ratio by means of noise filtering or apodization, for enhancing measured MR data in terms of resolution by means for deblurring, windowing, zero filling, or generation of gray-scaled images, colour-coded images or images displaying vectors instead of pixels (image data processing or generation, in general G06T)} - G01R 33/561: by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences - G01R 33/5611: {Parallel magnetic resonance imaging, e.g. sensitivity encoding [SENSE], simultaneous acquisition of spatial harmonics [SMASH], unaliasing by Fourier encoding of the overlaps using the temporal dimension [UNFOLD], k-t-broad-use linear acquisition speed-up technique [k-t-BLAST], k-t-SENSE (structural details of arrays of sub-coils G01R33/3415)} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract Image quality can be improved and acceleration can be achieved, by optimizing sampling in a blade type radial measurement using an MRI apparatus. In a case of performing a blade type radial measurement in which a k-space is radially sampled by varying an angle of a blade configured with a plurality of parallel sampling lines, interline intervals between the plurality of parallel sampling lines are set to uneven intervals for at least one of a plurality of the blades having different angles. The sampling using uneven intervals can be evaluated, and line intervals can also be adjusted based on an evaluation result. ## Claims ### Claim 1 A magnetic resonance imaging apparatus comprising: an imaging unit that collects k-space data by measuring a nuclear magnetic resonance signal generated by a subject in accordance with a predetermined pulse sequence; and one or more processors that control sampling of the nuclear magnetic resonance signal, wherein the one or more processors perform control of radially sampling a k-space by varying an angle of a blade configured with a plurality of parallel sampling lines, and in the control, set interline intervals between the plurality of parallel sampling lines to uneven intervals for at least one of a plurality of the blades having different angles. ### Claim 2 (depends on 1) The magnetic resonance imaging apparatus according to claim 1, wherein the one or more processors control the interline intervals such that the intervals are wider from a center toward an outside. ### Claim 3 (depends on 2) The magnetic resonance imaging apparatus according to claim 2, wherein the interline intervals are at least one of geometric series intervals, Fibonacci intervals, or intervals that change with quadratic functions. ### Claim 4 (depends on 1) The magnetic resonance imaging apparatus according to claim 1, wherein the one or more processors perform control of varying a sampling pattern depending on the blade. ### Claim 5 (depends on 1) The magnetic resonance imaging apparatus according to claim 1, wherein the one or more processors include an evaluation unit that evaluates the sampling of the k-space. ### Claim 6 (depends on 5) The magnetic resonance imaging apparatus according to claim 5, wherein the evaluation unit evaluates the sampling by using a sampling density of the k-space as an evaluation value. ### Claim 7 (depends on 5) The magnetic resonance imaging apparatus according to claim 5, wherein the evaluation unit evaluates the sampling by using a maximum value of sidelobes of a point spread function (PSF) occurring in a sampling pattern as an evaluation value. ### Claim 8 (depends on 5) The magnetic resonance imaging apparatus according to claim 5, wherein the one or more processors adjust the interline intervals based on an evaluation value of the evaluation unit. ### Claim 9 (depends on 1) The magnetic resonance imaging apparatus according to claim 1, further comprising: a UI unit that presents at least one of a sampling pattern of the k-space or a prediction image reconstructed from k-space data of the sampling pattern to a user. ### Claim 10 (depends on 1) The magnetic resonance imaging apparatus according to claim 1, further comprising: a UI unit that accepts user selection or user adjustment of a sampling pattern of the k-space. ### Claim 11 (depends on 1) The magnetic resonance imaging apparatus according to claim 1, further comprising: an image reconstruction unit that uses the k-space data to reconstruct an image of the subject through a Fourier transformation or iterative reconstruction operation. ### Claim 12 (depends on 11) The magnetic resonance imaging apparatus according to claim 11, wherein the one or more processors set the interline intervals to random intervals, and the image reconstruction unit generates the image through the iterative reconstruction operation. ### Claim 13 (depends on 1) The magnetic resonance imaging apparatus according to claim 1, wherein the pulse sequence is an FSE sequence or a GrE-based multi-echo sequence, in which one blade is sampled by one excitation pulse. ### Claim 14 A control method for a magnetic resonance imaging apparatus including an imaging unit that collects k-space data by measuring a nuclear magnetic resonance signal generated by a subject in accordance with a predetermined pulse sequence, the control method comprising: performing control of radially sampling a k-space by varying an angle of a blade configured with a plurality of parallel sampling lines, and in the control, setting interline intervals between the plurality of parallel sampling lines to uneven intervals for at least one of a plurality of the blades having different angles. ### Claim 15 (depends on 14) The control method for a magnetic resonance imaging apparatus according to claim 14, further comprising: evaluating a sampling pattern, wherein the uneven intervals are adjusted based on an evaluation result of the sampling pattern.