# US 2017/0281108 A1 · Mammography system and mammography photographing method

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- Number: US 2017/0281108 A1
- Document ID: US20170281108A1
- Status: Published application
- Kind: A1
- Application number: 15/506,883
- Filed: 2015-08-27
- Published: 2017-10-05
- Earliest claimed: 2014-08-29
- Assignees: Rayence Co., Ltd.; VATECH EWOO Holdings Co., Ltd.
- Applicants: Rayence Co., Ltd.; VATECH EWOO Holdings Co., Ltd.
- Inventors: Sung Il CHOI; Woong BAE; Tae Woo KIM; Keun Yeong KIM
- Web page: https://patentgrep.com/patent/US20170281108A1

## CPC

- A61B 6/502: {for diagnosis of breast, i.e. mammography}
- A61B 6/025: {Tomosynthesis}
- A61B 6/032: {Transmission computed tomography [CT]}
- A61B 6/0414: {with compression means}
- A61B 6/0435: {with means for imaging suspended breasts}
- A61B 6/4441: {the rigid structure being a C-arm or U-arm}
- A61B 6/5217: {extracting a diagnostic or physiological parameter from medical diagnostic data}
- A61B 6/5258: {involving detection or reduction of artifacts or noise}
- A61B 6/544: {dependent on patient size}
- A61B 6/582: {Calibration}
- A61B 6/583: {using calibration phantoms}
- A61B 6/482: {involving multiple energy imaging}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

Disclosed are a mammography system and a mammography imaging method that can prevent a subject from being exposed to radiation more than necessary by setting an optimum imaging condition according to a thickness of a subject's breast, and can obtain a high-quality medical image by setting an optimum FOV and correcting projection data according to the thickness of the breast. The mammography system includes: a mammography imaging device including a detector and an X-ray tube, and obtaining X-ray image data of a subject's breast from multiple angles; a thickness obtaining unit obtaining information on a thickness of the breast; and a rotation angle calculator calculating a rotation angle range of the X-ray tube, based on the information of the thickness of the breast, wherein the mammography imaging device obtains the X-ray image data from multiple angles by performing radiography while rotating the X-ray tube within the rotation angle range.

## Claims

### Claim 1

A mammography system comprising:
a mammography imaging device including a detector and an X-ray tube, and configured to obtain X-ray image data of a subject's breast from multiple angles;
a thickness obtaining unit configured to obtain information on a thickness of the breast; and
a rotation angle calculator configured to calculate a rotation angle range of the X-ray tube, based on the information of the thickness of the breast,
wherein the mammography imaging device obtains the X-ray image data from multiple angles by performing radiography while rotating the X-ray tube within the rotation angle range, and
wherein the rotation angle range is inversely proportional to the thickness of the breast.

### Claim 2 (depends on 1)

The mammography system of claim 1, wherein the mammography imaging device further includes a compression panel configured to compress the breast between the X-ray tube and the detector and a support panel, and
the thickness obtaining unit is configured to obtain the information of the thickness of the breast, based on a distance between the compression panel and the support panel.

### Claim 3 (depends on 2)

The mammography system of claim 2, wherein the support panel is the detector.

### Claim 4 (depends on 1)

The mammography system of claim 1, wherein the mammography imaging device is further configured to set a tube voltage and a dose corresponding to the information on the thickness of the breast.

### Claim 5 (depends on 1)

The mammography system of claim 1, further comprising:
a FOV setter configured to set a field of view (FOV) corresponding to a size of the breast, based on the information of the thickness of the breast and the X-ray image data from multiple angles; and
an image reconstructor configured to reconstruct a three-dimensional tomographic image data of the FOV, based on the X-ray image data from multiple angles.

### Claim 6 (depends on 5)

The mammography system of claim 5, wherein the FOV setter is configured to detect a border of the breast from the X-ray image data from multiple angles, and sets the FOV based on both the border of the breast and the thickness of the breast.

### Claim 7 (depends on 5)

The mammography system of claim 5, further comprising: a data corrector configured to correct the X-ray image data from multiple angles by calculating a value of X-ray attenuation corresponding to a transmission length through the FOV at the multiple angles of the X-ray tube,
wherein the image reconstructor is configured to produce the three-dimensional tomographic image data of the FOV, based on the corrected X-ray image data from multiple angles.

### Claim 8

(canceled)

### Claim 9

(canceled)

### Claim 10

(canceled)

### Claim 11

(canceled)

### Claim 12

(canceled)

### Claim 13 (depends on 7)

The mammography system of claim 7, wherein the data corrector corrects the X-ray image data from multiple angles using a compensation coefficient corresponding to the X-ray transmission length.

### Claim 14 (depends on 13)

The mammography system of claim 13, wherein the data corrector corrects the X-ray image data from multiple angles using a predetermined compensation table.