# US 11,906,609 B2 · Image reconstruction apparatus

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- Number: US 11,906,609 B2
- Document ID: US11906609B2
- Status: Granted
- Kind: B2
- Application number: 17/128,476
- Filed: 2020-12-21
- Published: 2021-08-12
- Granted: 2024-02-20
- Earliest claimed: 2020-02-12
- Assignees: Canon Medical Systems Corporation
- Applicants: Canon Medical Systems Corporation
- Inventors: Hidenori Takeshima
- Web page: https://patentgrep.com/patent/US11906609B2

## CPC

- 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 33/5619: {by temporal sharing of data, e.g. keyhole, block regional interpolation scheme for k-Space [BRISK]}
- G01R 33/5635: {Angiography, e.g. contrast-enhanced angiography [CE-MRA] or time-of-flight angiography [TOF-MRA]}
- G06T 7/0012: {Biomedical image inspection}
- G06T 12/20: Inverse problem, i.e. transformations from projection space into object space
- 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 33/56308: {Characterization of motion or flow; Dynamic imaging}
- G06T 2207/10088: Magnetic resonance imaging [MRI]
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

An image reconstruction apparatus according to an embodiment includes a processing circuitry configured to reconstruct at least one image from a plurality of pieces of k-space data acquired in a time direction. The processing circuitry performs image estimation calculation that reconstructs estimated images sharing the k-space data in the time direction, and adaptation calculation that adapts the estimated images to prior knowledge in the time direction.

## Claims

### Claim 1

An image reconstruction apparatus, comprising:
processing circuitry configured to reconstruct at least one image from a plurality of pieces of k-space data acquired in a time direction, wherein the processing circuitry is further configured to perform
an image estimation calculation that reconstructs temporally sequential estimated images sharing the k-space data in the time direction, and
an adaptation calculation that adapts the temporally sequential estimated images reconstructed by the image estimation calculation to prior knowledge in the time direction.

### Claim 2 (depends on 1)

The image reconstruction apparatus according to claim 1, wherein the prior knowledge used in the adaptation calculation by the processing circuitry further includes contents in a spatial direction.

### Claim 3 (depends on 1)

The image reconstruction apparatus according to claim 1, wherein the processing circuitry is further configured to reconstruct the image by using the prior knowledge, which is based on deep learning, compression sensing, singular value decomposition, or principal component analysis.

### Claim 4 (depends on 1)

The image reconstruction apparatus according to claim 1, wherein
the image estimation calculation and the adaptation calculation are each a calculation that optimizes the temporally sequential estimated images, and
the processing circuitry is further configured to alternately execute the image estimation calculation and the adaptation calculation.

### Claim 5 (depends on 1)

The image reconstruction apparatus according to claim 1, wherein
the image estimation calculation and the adaptation calculation are each a calculation that optimizes the temporally sequential estimated images, and
the processing circuitry is further configured to simultaneously execute the image estimation calculation and the adaptation calculation.

### Claim 6 (depends on 1)

The image reconstruction apparatus according to claim 1, wherein the image estimation calculation is a calculation that reconstructs the temporally sequential estimated images by parallel imaging.