# US 2023/0056033 A1 · X-ray diagnosis apparatus, medical image processing apparatus, and storage medium

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- Number: US 2023/0056033 A1
- Document ID: US20230056033A1
- Status: Published application
- Kind: A1
- Application number: 17/819,037
- Filed: 2022-08-11
- Published: 2023-02-23
- Earliest claimed: 2021-08-17
- Assignees: Canon Medical Systems Corporation
- Applicants: Canon Medical Systems Corporation
- Inventors: Hirona OIKAWA; Masahiro OZAWA; Hag Chang LEE
- Web page: https://patentgrep.com/patent/US20230056033A1

## CPC

- G06T 5/10: using non-spatial domain filtering
- A61B 6/5258: {involving detection or reduction of artifacts or noise}
- G06T 5/20: using local operators
- G06T 12/30: Image post-processing, e.g. metal artefact correction
- A61B 6/12: Arrangements for detecting or locating foreign bodies
- A61B 6/461: {Displaying means of special interest}
- A61B 6/504: {for diagnosis of blood vessels, e.g. by angiography}
- A61B 6/505: {for diagnosis of bone}
- A61B 6/5205: {involving processing of raw data to produce diagnostic data}
- G06T 2207/10116: X-ray image
- G06T 2207/20081: Training; Learning
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

An X-ray diagnosis apparatus according to an embodiment includes processing circuitry configured: to detect an element from X-ray image data taken of an examined subject; to determine a parameter of multi-frequency processing on the basis of a detection result of the element; and to execute the multi-frequency processing on one or both of the X-ray image data and another piece of X-ray image data taken later than the X-ray image data, on the basis of the determined parameter.

## Claims

### Claim 1

An X-ray diagnosis apparatus comprising processing circuitry configured:
to detect an element from X-ray image data taken of an examined subject;
to determine a parameter of multi-frequency processing on a basis of a detection result of the element; and
to execute the multi-frequency processing on one or both of the X-ray image data and another piece of X-ray image data taken later than the X-ray image data, on a basis of the parameter.

### Claim 2 (depends on 1)

The X-ray diagnosis apparatus according to claim 1, wherein the processing circuitry is configured:
to repeatedly obtain X-ray image data taken of the examined subject;
to repeatedly perform the element detecting process on each newly-obtained piece of X-ray image data;
to repeatedly perform the parameter determining process in conjunction with the element detecting process; and
to repeatedly execute the multi-frequency processing on a basis of the repeatedly-determined parameter.

### Claim 3 (depends on 1)

The X-ray diagnosis apparatus according to claim 1, wherein the processing circuitry is configured:
to perform, in the multi-frequency processing, at least a frequency separation process to generate a plurality of pieces of frequency band data separated in correspondence with a plurality of frequency bands, from one or both of the X-ray image data and said another piece of X-ray image data;
to determine the parameter of the multi-frequency processing including a threshold value used in the frequency separation process; and
to separate the plurality of pieces of frequency band data by performing the frequency separation process on one or both of the X-ray image data and said another piece of X-ray image data taken later than the X-ray image data, on a basis of the threshold value included in the parameter.

### Claim 4 (depends on 3)

The X-ray diagnosis apparatus according to claim 3, wherein, the processing circuitry is configured:
to generate, in the frequency separation process, the plurality of pieces of frequency band data including mutually-different frequency bands, by applying, at stages, a low pass filter to one or both of the X-ray image data and said another piece of X-ray image data; and
to set a cutoff frequency of the low pass filter as the threshold value.

### Claim 5 (depends on 3)

The X-ray diagnosis apparatus according to claim 3, wherein the processing circuitry is configured:
to perform, in the multi-frequency processing, at least an emphasized characteristic adjusting process to emphasize or suppress the plurality of pieces of frequency band data by applying a coefficient to each of the plurality of pieces of frequency band data;
to determine the parameter of the multi-frequency processing including the coefficient; and
to perform the emphasized characteristic adjusting process on one or both of the X-ray image data and said another piece of X-ray image data taken later than the X-ray image data, on a basis of the coefficient included in the parameter.

### Claim 6 (depends on 3)

The X-ray diagnosis apparatus according to claim 3, wherein the processing circuitry is configured:
to detect a type of an element rendered in the X-ray image data and an image region rendering the element; and
to determine the parameter on a basis of the detected type of the element and a size of the image region from which the element was detected.

### Claim 7 (depends on 3)

The X-ray diagnosis apparatus according to claim 3, wherein the processing circuitry is configured:
to calculate, with respect to each element, what percentage of the X-ray image data is accounted for by an image region rendering the element; and
to determine the threshold value on a basis of the percentages.

### Claim 8 (depends on 3)

The X-ray diagnosis apparatus according to claim 3, wherein the processing circuitry is configured to input the X-ray image data to a trained model and configured to obtain a segmentation result corresponding to elements included in the X-ray image data and being output from the trained model, the trained model having been trained with a training set of X-ray image data and corresponding ground truth segmentation results of the X-ray image data.

### Claim 9 (depends on 1)

The X-ray diagnosis apparatus according to claim 1, wherein the processing circuitry is configured:
to recognize a section in which a plurality of image regions rendering mutually-different types of elements overlap with each other on a basis of a detection result of the elements; and
to determine the parameter in accordance with the types of the elements of which the image regions overlap with each other.

### Claim 10 (depends on 1)

The X-ray diagnosis apparatus according to claim 1, wherein the processing circuitry is configured to determine the parameter used in common among a plurality of pieces of X-ray image data that include the X-ray image data and said another piece of X-ray image data and that were taken successively.

### Claim 11 (depends on 1)

The X-ray diagnosis apparatus according to claim 1, wherein the processing circuitry is configured to determine the parameter with respect to each of image regions rendering elements within the X-ray image data.

### Claim 12 (depends on 11)

The X-ray diagnosis apparatus according to claim 11, further comprising: a memory having stored therein the parameters corresponding to types of the elements, wherein
with respect to each of the image regions rendering the elements within the X-ray image data, the processing circuitry is configured to select, from the memory, the parameter corresponding to the type of the rendered element.

### Claim 13 (depends on 1)

The X-ray diagnosis apparatus according to claim 1, wherein the processing circuitry is configured to determine the parameter further on a basis of at least one selected from among the following used at a time of taking the X-ray image data: an examination protocol, an imaging field of view, a magnification ratio, an X-ray condition, and a positional relationship between a apparatus used for taking the X-ray image data and the examined subject.

### Claim 14 (depends on 1)

The X-ray diagnosis apparatus according to claim 1, further comprising:
a table on which the examined subject is placed;
an X-ray detector configured to detect X-rays that have passed through the examined subject; and
an arm configured to support the X-ray detector, wherein
the processing circuitry is configured to determine the parameter on a basis of one selected from among: a source image distance, a height of the table, and a rotation amount of the arm.

### Claim 15

A medical image processing apparatus comprising processing circuitry configured:
to detect an element from X-ray image data taken of an examined subject;
to determine a parameter of multi-frequency processing on a basis of a detection result of the element; and
to execute the multi-frequency processing on one or both of the X-ray image data and another piece of X-ray image data taken later than the X-ray image data, on a basis of the parameter.

### Claim 16 (depends on 15)

The medical image processing apparatus according to claim 15, wherein the processing circuitry is configured:
to determine, on a basis of the detection result of the element, the parameter including a threshold value used in a frequency separation process included in the multi-frequency processing, the frequency separation process being configured to generate a plurality of pieces of frequency band data separated in correspondence with a plurality of frequency bands, from one or both of the X-ray image data and said another piece of X-ray image data; and
to separate the plurality of pieces of frequency band data by performing the frequency separation process on one or both of the X-ray image data and said another piece of X-ray image data taken later than the X-ray image data, on a basis of the threshold value.

### Claim 17 (depends on 15)

The medical image processing apparatus according to claim 15, wherein the processing circuitry is configured:
to recognize a section in which a plurality of image regions rendering mutually-different types of elements overlap with each other on a basis of a detection result of the elements; and
to determine the parameter in accordance with the types of the elements of which the image regions overlap with each other.

### Claim 18 (depends on 15)

The medical image processing apparatus according to claim 15, wherein the processing circuitry is configured to determine the parameter used in common among a plurality of pieces of X-ray image data that include the X-ray image data and said another piece of X-ray image data and that were taken successively.

### Claim 19 (depends on 15)

The medical image processing apparatus according to claim 15, wherein the processing circuitry is configured to determine the parameter further on a basis of at least one selected from among the following used at a time of taking the X-ray image data: an examination protocol, an imaging field of view, a magnification ratio, an X-ray condition, and a positional relationship between a apparatus used for taking the X-ray image data and the examined subject.

### Claim 20

A computer-readable storage medium having recorded thereon a plurality of instructions executable by a computer, wherein the plurality of instructions cause the computer to perform:
detecting an element from X-ray image data taken of an examined subject;
determining a parameter of multi-frequency processing on a basis of a detection result of the element; and
executing the multi-frequency processing on one or both of the X-ray image data and another piece of X-ray image data taken later than the X-ray image data, on a basis of the parameter.