公开(公告)号：US20240331116A1

公开(公告)日：2024-10-03

申请号：US18619922

申请日：2024-03-28

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Shun UEMATSU ,  Hideaki KUTSUNA ,  Kensuke SHINODA ,  Mitsuhiro BEKKU ,  Hana TOCHIBORI

IPC: G06T5/80 ,  G06T5/20 ,  G06T5/60 ,  G06T5/70

CPC classification number: G06T5/80 ,  G06T5/20 ,  G06T5/60 ,  G06T5/70 ,  G06T2207/10088 ,  G06T2207/20084 ,  G06T2207/30004

Abstract: A medical image processing apparatus according to one embodiment includes processing circuitry. The processing circuitry obtains input medical image data having a larger image region than output medical image data as a result of image processing; determines, in the input medical image data, a region that is smaller than the image region of the input medical image data and that is to affect image quality of the output medical image data when the image processing is applied to the input medical image data; performs the image processing to the determined region in the input medical image data; and outputs the output medical image data resulting from the image processing performed.

公开(公告)号：US20240078636A1

公开(公告)日：2024-03-07

申请号：US18461033

申请日：2023-09-05

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Matthew NIELSEN ,  Mitsuhiro BEKKU

IPC: G06T5/50 ,  G01R33/48 ,  G01R33/56 ,  G06T11/00

CPC classification number: G06T5/50 ,  G01R33/4818 ,  G01R33/5608 ,  G06T11/006 ,  G06T2207/10088 ,  G06T2207/20212

Abstract: An image processing apparatus according to an embodiment includes processing circuitry. The processing circuitry obtains, on the basis of a magnetic resonance image, a plurality of shift images resulting from shifting the position of the pixel sampling grid of the magnetic resonance image by a plurality of mutually-different shift amounts. The processing circuitry generates a plurality of ringing-corrected images, by determining, with respect to each of the pixels included in each of the plurality of shift images, a shift amount from the position of the pixel to a position where ringing artifacts will be reduced and further performing a ringing correction to correct the ringing artifacts occurring in the shift images on the basis of the determined shift amounts. The processing circuitry combines, while interleaving, pixels included in each of the plurality of ringing-corrected images.

公开(公告)号：US20220120835A1

公开(公告)日：2022-04-21

申请号：US17450174

申请日：2021-10-07

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Mitsuhiro BEKKU

IPC: G01R33/561 ,  G01R33/54 ,  G01R33/565

Abstract: An information processing apparatus according to an embodiment of the present disclosure includes a processing circuitry. The processing circuitry obtains a first g factor generated by using first magnetic resonance data acquired through a first parallel imaging process performed by using a plurality of reception coils and a second g factor generated by using second magnetic resonance data related to a second parallel imaging process performed by using the plurality of reception coils. The second parallel imaging process is different from the first parallel imaging process. The processing circuitry adjusts the first g factor so as to reduce a difference between the first g factor and the second g factor.

公开(公告)号：US20200309887A1

公开(公告)日：2020-10-01

申请号：US16830595

申请日：2020-03-26

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Mitsuhiro BEKKU

IPC: G01R33/565 ,  G01R33/56 ,  G01R33/48 ,  G06T11/00

Abstract: In one embodiment, an MRI apparatus includes processing circuitry configured to: calculate phase correction data, which includes information on phase rotation amount due to non-uniformity of a static magnetic field, from MR signals; generate an image by using the phase correction data and the MR signals such that a signal from at least one of substances having different magnetic resonance frequencies in an imaging region of an object is suppressed in the image; generate first phase correction data composed of phase data that correspond to phase rotation amount selected from choices of phase rotation amount; calculate discontinuity of the first phase correction data; and generate second phase correction data by substituting at least part of the first phase correction data with non-selected phase data, which corresponds to phase rotation amount being not selected among the choices of phase rotation amount, depending on the discontinuity.

公开(公告)号：US20200309884A1

公开(公告)日：2020-10-01

申请号：US16830365

申请日：2020-03-26

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Mitsuhiro BEKKU

IPC: G01R33/48 ,  G01R33/56 ,  G01R33/565

Abstract: In one embodiment, an MRI apparatus includes: a scanner for acquiring MR signals from an imaging region in which substances having different magnetic resonance frequencies are included; and processing circuitry. The processing circuitry is configured to: calculate phase correction data, which includes information on phase rotation amount due to non-uniformity of a static magnetic field, from MR signals; generate an image by using the phase correction data and the MR signals such that a signal from at least one of the substances in the imaging region is suppressed in the image; and perform decimation processing on first phase correction data to generate second phase correction data, based on information related to a component ratio of the plurality of substances in the imaging region and a plurality of MR signals, wherein resolution of the second phase correction data is lower than the first phase correction data.

公开(公告)号：US20240074671A1

公开(公告)日：2024-03-07

申请号：US18460740

申请日：2023-09-05

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Matthew NIELSEN ,  Mitsuhiro BEKKU

IPC: A61B5/055 ,  G06T5/50 ,  G06T7/00

CPC classification number: A61B5/055 ,  G06T5/50 ,  G06T7/0012 ,  G06T2207/20224 ,  G06T2207/30016

Abstract: An image processing apparatus according to an embodiment includes processing circuitry. The processing circuitry determines, with respect to each of the pixels included in a magnetic resonance image, a shift amount from the position of the pixel to a position where ringing artifacts will be reduced and performs a ringing correction to correct the ringing artifacts occurring in the magnetic resonance image on the basis of the determined shift amounts. The processing circuitry estimates, with respect to each of the pixels, a local amplitude of ringing artifacts, and performs the ringing correction on the magnetic resonance image while determining the shift amount of each of the pixels so as to be approximately continuous with the shift amounts of adjacently positioned pixels, sequentially in descending order starting with pixels having a higher local amplitude on the basis of the estimated local amplitudes of ringing artifacts.

公开(公告)号：US20230397835A1

公开(公告)日：2023-12-14

申请号：US18318190

申请日：2023-05-16

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Takahiro TAMURA ,  Mitsuhiro BEKKU

IPC: A61B5/055 ,  G16H30/40 ,  G06T7/00

CPC classification number: A61B5/055 ,  G16H30/40 ,  G06T7/0002 ,  A61B5/0033

Abstract: A MRI apparatus according to an embodiment includes processing circuitry. The processing circuitry obtains MR data acquired by implementing an IR method under a condition where a phase difference in a complex signal related to observed elements is equal to π, due to a difference in longitudinal magnetization relaxation time between the observed elements; generates phase data on the basis of the MR data; multiplies a phase angle in the phase data by 2n; unfolds the phase of phase data having the phase angle multiplied by 2n; multiplies the phase angle in the unfolded phase data by 1/(2n); generates a phase correction map used for correcting a phase with respect to the complex signal, by applying a complex conjugate to phase data having the phase angle multiplied by 1/(2n); and performs a phase correction on the MR data by using the phase correction map.

公开(公告)号：US20220133169A1

公开(公告)日：2022-05-05

申请号：US17503718

申请日：2021-10-18

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Shohei HAMANAGA ,  Mitsuhiro BEKKU

IPC: A61B5/055 ,  G01R33/48 ,  G01R33/561

Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a processing circuitry. Regarding the k-space data obtained as a result of performing multi-shot imaging that includes a plurality of shots, the processing circuitry obtains a correction coefficient, based on first-type magnetic resonance images generated using the k-space data, the correction coefficient correcting phase shifting occurring in read out direction among the plurality of shots. Then, the processing circuitry corrects the k-space data based on the correction coefficients. Moreover, the processing circuitry generates a second-type magnetic resonance image using the corrected k-space data.

公开(公告)号：US20250147133A1

公开(公告)日：2025-05-08

申请号：US18904060

申请日：2024-10-01

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Masahiro ABE ,  Shohei HAMANAGA ,  Mitsuhiro BEKKU

IPC: G01R33/48 ,  G01R33/565

Abstract: In one embodiment, a phase correction method comprising: acquiring first k-space data acquired in a first readout direction and second k-space data acquired in a second readout direction that is opposite to the first readout direction; weighting first real space data obtained from the first k-space data to generate first adjusted data with a predetermined weighting in which weight coefficients vary depending on a pixel position in a readout direction and become lower in a region where a variance of a phase difference is larger than a predetermined variance; weighting second real space data obtained from the second k-space data to generate second adjusted data with the predetermined weighting; calculating a correction amount for correcting a phase difference; and correcting a phase difference between data that are different from each other in polarity of a gradient pulse in the readout direction during acquisition, by using the correction amount.