JP2016073466A5

JP2016073466A5 -

Info

Publication number: JP2016073466A5
Application number: JP2014206125A
Authority: JP
Filing date: 2014-10-07
Publication date: 2017-06-22
Anticipated expiration: 2034-10-07

Description

請求項４に記載の発明は、請求項２又は３に記載の発明において、
前記照合手段は、前記Ｘ線画像群中の各画像についての前記抽出手段による抽出結果を、当該Ｘ線画像群中で時系列が連続する複数枚の画像についての抽出結果と照合する。 The invention according to claim 4 is the invention according to claim 2 or 3,
The collation unit collates the extraction result by the extraction unit for each image in the X-ray image group with the extraction result for a plurality of images in time series that are continuous in the X-ray image group .

請求項７記載の発明は、請求項６に記載の発明において、
前記照合手段は、前記各画像の画素毎又は複数の画素からなる小領域毎に、当該画像及び当該画像に時系列が連続する複数の画像に割り当てられた数値を加算する際に、当該画像及び当該画像に連続する複数の画像のそれぞれに重み付け係数を付与し、前記割り当てられた数値に前記付与された重み付け係数を乗算した値を加算した結果が所定の閾値以上である画素又は小領域を前記所定構造物の領域と判定する。 The invention according to claim 7 is the invention according to claim 6,
The collating means, when adding the image and the numerical value assigned to the image and a plurality of images that are continuous in time series to the image, for each pixel or each small region composed of a plurality of pixels, the weighting factor assigned to each of the plurality of continuous images in the image, the assigned the granted result of weighting coefficients by adding the multiplied value was the value is the pixel or small area is above a predetermined threshold value The area is determined to be a predetermined structure.

請求項１０に記載の発明は、請求項１に記載の発明において、
前記構造物減弱手段は、
前記Ｘ線画像群中の何れか一以上の画像から前記所定構造物の領域を抽出する第一の抽出手段と、
前記第一の抽出手段により抽出された前記所定構造物の領域を参照して、前記Ｘ線画像群中の前記第一の抽出手段による抽出対象となっていない他の画像から前記所定構造物の領域を抽出する第二の抽出手段と、
前記所定構造物の領域の抽出結果に基づいて、前記Ｘ線画像群中の各画像から前記所定構造物の領域を特定し、当該領域における空間的信号変化を減弱する減弱手段と、
を備える。 The invention according to claim 10 is the invention according to claim 1,
The structure attenuation means is
First extraction means for extracting a region of the predetermined structure from any one or more images in the X-ray image group;
With reference to the region of the predetermined structure extracted by the first extraction means, from other images not the extraction target by the first extraction means in the X-ray images of the predetermined structure A second extraction means for extracting an area;
Based on the extraction result of the region of the predetermined structure, the region of the predetermined structure is identified from each image in the X-ray image group, and attenuation means for attenuating a spatial signal change in the region;
Is provided.

請求項１２に記載の発明は、請求項１〜１１の何れか一項に記載の発明において、
前記構造物減弱手段は、
前記Ｘ線画像群中の各画像に対し、当該画像の前記所定構造物による空間的信号変化を減弱するために用いる前記所定構造物の濃度プロファイルを作成する濃度プロファイル作成手段と、
前記作成された各画像の濃度プロファイルを、当該濃度プロファイルを用いた減弱処理を行う前に、当該画像の濃度プロファイルと、少なくとも一枚の当該画像とは別の画像の濃度プロファイルに基づいて補正する濃度プロファイル補正手段と、
を備える。
請求項１３に記載の発明は、請求項１２に記載の発明において、
前記少なくとも一枚の当該画像とは別の画像の濃度プロファイルは、時系列順が当該画像の前後の複数の画像の濃度プロファイルから求めた代表値である。
請求項１４に記載の発明は、請求項１３に記載の発明において、
前記代表値は、中央値である。 The invention according to claim 12 is the invention according to any one of claims 1 to 11,
The structure attenuation means is
A density profile creating means for creating a density profile of the predetermined structure used to attenuate a spatial signal change due to the predetermined structure of the image for each image in the X-ray image group;
The density profile of each created image is corrected based on the density profile of the image and the density profile of an image different from at least one of the images before performing attenuation processing using the density profile. Density profile correction means ;
Is provided.
The invention according to claim 13 is the invention according to claim 12,
The density profile of an image different from the at least one image is a representative value obtained from the density profiles of a plurality of images before and after the image in time series order.
The invention according to claim 14 is the invention according to claim 13,
The representative value is a median value.

請求項１５に記載の発明は、請求項１〜１４の何れか一項に記載の発明において、
前記Ｘ線画像群は、被写体部位の動態を示す複数のフレーム画像である。 The invention according to claim 15 is the invention according to any one of claims 1 to 14 ,
Before Symbol X-ray images is a plurality of frame images showing the kinetics of the subject site.

請求項１６に記載の発明は、請求項１〜１４の何れか一項に記載の発明において、
前記Ｘ線画像群は、同一被写体の同一部位を、一定期間以上経て撮影された少なくとも２枚以上の画像である。 The invention according to claim 16 is the invention according to any one of claims 1 to 14 ,
The X-ray image group is at least two or more images taken over the same part of the same subject after a predetermined period.

請求項１７に記載の発明のプログラムは、
同一被検者の同一部位を複数回Ｘ線撮影することで得られた複数枚の画像が時系列順に並べられたＸ線画像群に対して、所定構造物による空間的信号変化を減弱する画像処理装置に用いられるコンピューターを、
前記Ｘ線画像群中の各画像の前記所定構造物による空間的信号変化を前記Ｘ線画像群中の当該画像とは別の画像の情報を用いて減弱する構造物減弱手段、
として機能させる。 The program of the invention described in claim 17
An image that attenuates a spatial signal change caused by a predetermined structure with respect to an X-ray image group in which a plurality of images obtained by performing X-ray imaging of the same part of the same subject are arranged in time series. The computer used for the processing device
Each image of the predetermined structure by spatial signal changes the X-ray structure creation attenuation means you attenuated using information of another image with the image in the image group in the X-ray images,
To function as.

Claims

A structure that attenuates spatial signal changes caused by a predetermined structure with respect to an X-ray image group in which a plurality of images obtained by X-ray imaging of the same part of the same subject are arranged in chronological order In the image processing apparatus provided with the material attenuation means,
The structure attenuation means attenuates a spatial signal change due to the predetermined structure of each image in the X-ray image group using information of an image different from the image in the X-ray image group. apparatus.

The structure attenuation means is
Extraction means for extracting an area of the predetermined structure from each image in the X-ray image group;
For each image in the X-ray image group, the extraction result by the extraction unit is collated with the extraction result for an image different from the image in the X-ray image group, and based on the collation result, Collating means for correcting the extraction result;
Based on the extraction result after processing by the collating means, an area of the predetermined structure is specified from each image in the X-ray image group, and attenuation means for attenuating a spatial signal change in the area;
An image processing apparatus according to claim 1.

The image processing apparatus according to claim 2, further comprising a re-extraction unit that re-extracts the region of the predetermined structure based on the corrected extraction result with respect to an image in which the extraction result is corrected by the extraction unit by the collating unit. Image processing apparatus.

The collation means collates the extraction result by the extraction means for each image in the X-ray image group with the extraction results for a plurality of images in time series that are continuous in the X-ray image group. Or the image processing apparatus of 3.

For each image in the group of X-ray images, the collating unit is configured to determine the image in a predetermined number or more among the image and a plurality of images that are time-sequential to the image, for each pixel or each small region including a plurality of pixels. It is determined whether or not the pixel or the small region is extracted as the region of the predetermined structure, and when the determination result is different from the extraction result in the pixel or the small region of the image, the pixel of the image The image processing apparatus according to claim 4, wherein the extraction result in the small region is corrected to the same result as the determination result.

For each image in the X-ray image group, the collating unit assigns a predetermined numerical value to a pixel or a small region extracted as an area of the predetermined structure by the extracting unit, and the extracting unit assigns a predetermined numerical value. 0 is assigned to a pixel or small area that has not been extracted as an area, and for each pixel or small area of each image, the image and a numerical value assigned to a plurality of images that are continuous in time series are added and added. A pixel or a small area whose result is greater than or equal to a predetermined threshold is determined as the area of the predetermined structure, and when the determination result is different from the extraction result of the pixel or the small area of the image, The image processing apparatus according to claim 4, wherein an extraction result in the pixel or the small region is corrected to the same result as the determination result.

The collating means, when adding the image and the numerical value assigned to the image and a plurality of images that are continuous in time series to the image, for each pixel or each small region composed of a plurality of pixels, the weighting factor assigned to each of the plurality of continuous images in the image, the assigned the granted result of weighting coefficients by adding the multiplied value was the value is the pixel or small area is above a predetermined threshold value The image processing apparatus according to claim 6, wherein the image processing apparatus determines that the area is a predetermined structure.

The subject part of the X-ray image group is a chest,
Recognizing means for recognizing the respiratory phase of each image in the X-ray image group;
The image processing apparatus according to claim 7, wherein the collation unit changes a weighting coefficient assigned to the image to be collated and an image used for collation with the image based on a respiratory phase of the image to be collated.

The subject part of the X-ray image group is a chest,
Recognizing means for recognizing the respiratory phase of each image in the X-ray image group;
The image processing apparatus according to any one of claims 2 to 8, wherein the collation unit changes the number of images used for collation with the image based on a respiratory phase of the image to be collated.

The structure attenuation means is
First extraction means for extracting a region of the predetermined structure from any one or more images in the X-ray image group;
With reference to the region of the predetermined structure extracted by the first extraction means, from another image that is not a detection target by the first extraction means in the X-ray images of the predetermined structure A second extraction means for extracting an area;
Based on the extraction result of the region of the predetermined structure, the region of the predetermined structure is identified from each image in the X-ray image group, and attenuation means for attenuating a spatial signal change in the region;
An image processing apparatus according to claim 1.

The structure attenuation means is configured to reduce the spatial signal change of the predetermined structure in each image in the X-ray image group after the attenuation process of the spatial signal change of the predetermined structure in each image in the X-ray image group. The attenuation result of the image is compared with the attenuation result of an image different from the image. The image processing apparatus according to any one of claims 1 to 10, wherein the attenuation process of the spatial signal change of the predetermined structure is performed again.

The structure attenuation means is
A density profile creating means for creating a density profile of the predetermined structure used to attenuate a spatial signal change due to the predetermined structure of the image for each image in the X-ray image group;
The density profile of each created image is corrected based on the density profile of the image and the density profile of an image different from at least one of the images before performing attenuation processing using the density profile. Density profile correction means ;
An image processing apparatus according to any one of claims 1 to 11.

The image processing apparatus according to claim 12, wherein the density profile of an image different from the at least one image is a representative value obtained from the density profiles of a plurality of images before and after the image in time series order.

The image processing apparatus according to claim 13, wherein the representative value is a median value.

The X-ray images, the image processing apparatus according to any one of claim 1 to 14 which is a plurality of frame images showing the kinetics of the subject site.

The image processing apparatus according to any one of claims 1 to 14 , wherein the X-ray image group is at least two or more images taken of a same part of the same subject after a certain period or more.

An image that attenuates a spatial signal change caused by a predetermined structure with respect to an X-ray image group in which a plurality of images obtained by performing X-ray imaging of the same part of the same subject are arranged in time series. The computer used for the processing device
Each image of the predetermined structure by spatial signal changes the X-ray structure creation attenuation means you attenuated using information of another image with the image in the image group in the X-ray images,
Program to function as.