JP2021126162A5

JP2021126162A5 -

Info

Publication number: JP2021126162A5
Application number: JP2020020889A
Authority: JP
Filing date: 2020-02-10
Publication date: 2023-02-03
Anticipated expiration: 2040-02-10

Description

本発明の一態様による画像処理装置は以下の構成を備える。すなわち、
互いに異なる放射線エネルギーに対応する複数の放射線画像に第１のノイズ低減処理を行う第１処理手段と、
前記第１のノイズ低減処理を行って得た複数の放射線画像を用いて、エネルギーサブトラクション処理により分離画像を生成する生成手段と、
前記第１のノイズ低減処理に用いられるフィルタとは大きさと種類のうちの少なくとも１つが異なるフィルタが用いられる第２のノイズ低減処理を前記分離画像に行う第２処理手段と、を備える。
An image processing apparatus according to one aspect of the present invention has the following configuration. i.e.
a first processing means for performing a first noise reduction process on a plurality of radiation images corresponding to mutually different radiation energies;
generating means for generating separated images by energy subtraction processing using a plurality of radiographic images obtained by performing the first noise reduction processing;
and second processing means for performing a second noise reduction process on the separated image using a filter different in at least one of size and type from the filter used in the first noise reduction process.

Claims

a first processing means for performing a first noise reduction process on a plurality of radiation images corresponding to mutually different radiation energies;
generating means for generating separated images by energy subtraction processing using a plurality of radiographic images obtained by performing the first noise reduction processing;
and second processing means for performing a second noise reduction process on the separated image using a filter different in at least one of size and type from the filter used in the first noise reduction process. processing equipment.

The first noise reduction processing and the second noise reduction processing include at least one of a spatial direction filter and a time direction filter, and the filters used in the second noise reduction processing 2. The image processing apparatus according to claim 1 , wherein the kernel or filter coefficients are larger than the kernel or filter coefficients of the filter used in the first noise reduction processing.

2. The image according to claim 1 , wherein one of a spatial filter and a temporal filter is used in the first noise reduction process, and the other is used in the second noise reduction process. processing equipment.

The separated image is a third image obtained by synthesizing the thickness image of the first substance, which is the first separated image obtained by the energy subtraction processing, and the thickness image of the second substance, which is the second separated image. is an isolated image of
the third separated image is an image of the sum of the thickness of the first substance and the thickness of the second substance ;
4. The image processing apparatus according to claim 1 , wherein one of said first substance and said second substance is bone and the other is soft tissue.

The separated image is a third separated image obtained by synthesizing the first separated image and the second separated image obtained by the energy subtraction processing,
The generating means generates the first separated image or the 4. The image processing apparatus according to any one of claims 1 to 3 , wherein an image corresponding to the second separated image is generated.

The separated images include a first separated image and a second separated image obtained by the energy subtraction process,
An image corresponding to the second separated image is generated based on the radiation image to which the energy subtraction processing has not been applied and the first separated image to which the second noise reduction processing has been applied. 4. The image processing apparatus according to any one of claims 1 to 3 .

The generating means generates a pseudo separated image corresponding to the first separated image obtained by the energy subtraction processing , using the third radiographic image to which the energy subtraction processing is not applied and a predetermined constraint condition. generate and
3. A combination ratio for combining the separated image obtained by performing the second noise reduction process and the pseudo separated image is determined using the second separated image obtained by the energy subtraction process. 4. The image processing apparatus according to any one of 1 to 3 .

8. The method according to claim 7, wherein the generating means generates an image corresponding to the second separated image based on the image synthesized at the determined synthesis ratio and the third radiographic image. The described image processing device.

2. The first processing means performs the first noise reduction processing on the plurality of radiographic images so as to maintain edges of structures detected from radiographic images to which the energy subtraction processing has not been applied . 9. The image processing apparatus according to any one of items 1 to 8 .

The plurality of radiographic images are generated using a first radiographic image obtained by sample-holding at a plurality of timings including timings during irradiation and after completion of irradiation for one irradiation of radiation. The image processing apparatus according to any one of claims 1 to 9, comprising a first radiographic image and a second radiographic image.

The plurality of radiographic images are generated using a first radiographic image obtained by sample-holding at a plurality of timings including timings during irradiation and after completion of irradiation for one irradiation of radiation. including a first radiographic image and a second radiographic image;
The image processing apparatus according to claim 7 or 8, wherein a radiographic image acquired at a timing after the end of the irradiation is used as the third radiographic image.

9. The third radiographic image is generated by weighting and synthesizing the plurality of radiographic images, or any one of the plurality of radiographic images is used as the third radiographic image. The image processing device according to .

performing a first noise reduction process on a plurality of radiation images corresponding to different radiation energies;
Using a plurality of radiation images obtained by performing the first noise reduction process, generating a separated image by energy subtraction process,
An image processing method , wherein the separated image is subjected to a second noise reduction process using a filter different in at least one of size and type from the filter used in the first noise reduction process.

A program that causes a computer to function as each means of the image processing apparatus according to any one of claims 1 to 12 .