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：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.