Radiation exposure dose management apparatus, radiation exposure dose management method, and storage medium

Patent metadata

Field	Value
Publication number	US-12446846-B2
Application number	US-202218065105-A
Country	US
Kind code	B2
Filing date	Dec 13, 2022
Priority date	Dec 13, 2021
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

A radiation exposure dose management apparatus according to an embodiment is a radiation exposure dose management apparatus that manages a radiation dose received by a subject and includes processing circuitry configured: to obtain image data of the subject; to segment the image data in accordance with organs of the subject; to generate a voxel radiation dose distribution map indicating a radiation exposure dose of each of the voxels on the basis of a specific radiation exposure dose model and the image data; and to calculate a radiation exposure dose of each of the organs on the basis of the segmented image data and the radiation exposure dose of each of the voxels within the generated voxel radiation dose distribution map.

First claim

What is claimed is:

1. A radiation exposure dose management apparatus that manages a radiation dose received by a subject, the radiation exposure dose management apparatus comprising:
processing circuitry configured to:
obtain image data of the subject;
segment the image data in accordance with organs of the subject;
generate a voxel radiation dose distribution map indicating a radiation exposure dose of each of voxels based on a specific radiation exposure dose model and the image data;
correct the radiation exposure dose of each of the voxels in the generated voxel radiation dose distribution map based on a specific correction factor; and
calculate a radiation exposure dose of each of the organs based on the segmented image data and the corrected radiation exposure dose of each of the voxels in the generated voxel radiation dose distribution map.

2. The radiation exposure dose management apparatus according to claim 1 , wherein the processing circuitry is further configured to calculate a corrected radiation exposure dose of each of the organs, based on the segmented image data and the corrected radiation exposure dose of each of the voxels in the generated voxel radiation dose distribution map.

3. The radiation exposure dose management apparatus according to claim 2 , wherein the processing circuitry is further configured to further present a certainty risk and a random risk of each of the organs, based on the corrected radiation exposure dose of each of the organs in the generated voxel radiation dose distribution map.

4. The radiation exposure dose management apparatus according to claim 1 , wherein
when the subject has a plurality of pieces of image data, each serving as the image data, the processing circuitry is further configured to calculate a corrected voxel radiation dose accumulated value of each of the voxels, by adding together corrected voxel radiation doses of corresponding voxels, each from a different one of the plurality of pieces of image data, and
the processing circuitry is further configured to calculate a corrected radiation exposure dose of each of the organs based on the segmented image data and the calculated corrected voxel radiation dose accumulated value of each of the voxels.

5. The radiation exposure dose management apparatus according to claim 1 , wherein the specific correction factor used by the processing circuitry is a repair constant unique to an elapsed time period since a radiation exposure and to each of the organs.

6. The radiation exposure dose management apparatus according to claim 1 , wherein
the processing circuitry is further configured to obtain, as the image data, at least one selected from among: image data of the subject from a past scan; image data of a current scan; and image data of a pre-scan,
the pre-scan is a position determining scan performed before the current scan, and
when the obtained image data of the subject is the image data of the current scan, the image data is not to be corrected.

7. The radiation exposure dose management apparatus according to claim 1 , wherein the processing circuitry is further configured to generate the specific radiation exposure dose model by using a Deep Convolutional Neural Network.

8. The radiation exposure dose management apparatus according to claim 1 , wherein the processing circuitry is further configured to further cause a display to display the calculated radiation exposure dose of each of the organs.

9. The radiation exposure dose management apparatus according to claim 1 , further comprising one of an X-ray Computed Tomography (CT) detector, a Positron Emission Tomography (PET)-CT detector, and a Single Photon Emission Computed Tomography (SPECT)-CT detector.

10. The radiation exposure dose management apparatus according to claim 1 , wherein the processing circuitry is further configured to generate the specific radiation exposure dose model, which is a model trained to receive an input CT image and output a radiation dose distribution map for each voxel of the input CT image.

11. A radiation exposure dose management method for managing a radiation dose received by a subject, the radiation exposure dose management method comprising:
obtaining image data of the subject;
segmenting the image data in accordance with organs of the subject;
generating a voxel radiation dose distribution map indicating a radiation exposure dose of each of voxels based on a specific radiation exposure dose model and the image data;
correcting the radiation exposure dose of each of the voxels in the generated voxel radiation dose distribution map based on a specific correction factor; and
calculating a radiation exposure dose of each of the organs based on the segmented image data and the corrected radiation exposure dose of each of the voxels in the generated voxel radiation dose distribution map.

12. The radiation exposure dose management method according to claim 11 , further comprising generating the specific radiation exposure dose model, which is a model trained to receive an input CT image and output a radiation dose distribution map for each voxel of the input CT image.

13. A non-transitory computer-readable storage medium storing therein a program that, when executed, causes a computer to implement the radiation exposure dose management method according to claim 11 .

Assignees

• Canon Medical Systems Corp

Inventors

• Li Lin
• Wu Chen
• Zhu Qichen
• Ma Yongjun
• Yan Qingyu
• Guo Yu
• Xu Xieping
• Wang Yijin

Classifications

• G06T11/26

  Drawing of charts or graphs · CPC title

• A61B6/488

  involving pre-scan acquisition · CPC title

• A61B6/032

  Transmission computed tomography [CT] · CPC title

• A61B6/545 Primary

  involving automatic set-up of acquisition parameters · CPC title

• A61B6/542 Primary

  involving control of exposure · CPC title