JP2005270577A - Image processing device and image processing method - Google Patents

Image processing device and image processing method Download PDF

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JP2005270577A
JP2005270577A JP2004092598A JP2004092598A JP2005270577A JP 2005270577 A JP2005270577 A JP 2005270577A JP 2004092598 A JP2004092598 A JP 2004092598A JP 2004092598 A JP2004092598 A JP 2004092598A JP 2005270577 A JP2005270577 A JP 2005270577A
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Tatsuya Takagi
達也 高木
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Konica Minolta Medical and Graphic Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an image processing device and an image processing method capable of efficiently processing a medical image while holding necessary information. <P>SOLUTION: When various image processes are performed for image data by the image processing device 1, the image processing device 1 recognizes a region including a subject of diagnosis and sets the region as the region of interest. Then, the device sets the regions other than the region of interest as non-interest regions, divides the regions, and performs various processes corresponding to each divided region. Specifically, various image processes such as the gradation process, the dynamic range compression process, and the frequency emphasis process are performed for the region of interest to make the image highly minute enough for the image diagnosis, while the gradation process for adjusting the image contrast is performed for the non-interest regions. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、被写体を撮影した医用画像に画像処理を施す画像処理装置に関する。   The present invention relates to an image processing apparatus that performs image processing on a medical image obtained by photographing a subject.

近年、医療の分野においては、例えば、コンピュータ断層画像撮影装置(以下、「CT(Computed Tomography)」と記す)やコンピュータ放射線画像撮影装置(以下、「CR(Computed Radiography)」と記す)、核磁気共鳴イメージング装置(以下、「MRI(Magnetic Resonance Imaging)」と記す)等の各種医用画像入力装置によりデジタル画像として入力された医用画像に各種画像処理を施してCRT等のモニタに表示する、或いはフィルムに出力する医用画像処理装置が開発されている。このような医用画像処理装置により見やすく可視化された画像を観察することにより、医師は的確な診断を行うことができる。   In recent years, in the medical field, for example, a computer tomographic imaging apparatus (hereinafter referred to as “CT (Computed Tomography)”), a computer radiographic imaging apparatus (hereinafter referred to as “CR (Computed Radiography)”), nuclear magnetism, and the like. A medical image input as a digital image by various medical image input devices such as a resonance imaging apparatus (hereinafter referred to as “MRI (Magnetic Resonance Imaging)”) is subjected to various image processing and displayed on a monitor such as a CRT, or a film A medical image processing apparatus that outputs data to has been developed. By observing an image visualized easily by such a medical image processing apparatus, a doctor can make an accurate diagnosis.

上述した医用画像に施される画像処理としては、階調処理、ダイナミック圧縮処理、周波数強調処理等の各種処理がある。しかし、入力された画像データのすべての領域にこれらの各種処理を施すと、画像処理に多大な時間を要することとなる。そこで、例えば、画像データのうち被写体領域の占める割合が比較的小さい***画像にあっては、必要となる被写体領域のみに各種処理を施すことにより、画像処理の効率化を図っている。   Examples of the image processing performed on the medical image described above include various processing such as gradation processing, dynamic compression processing, and frequency enhancement processing. However, if these various processes are performed on all areas of the input image data, a great amount of time is required for the image processing. Therefore, for example, in the case of a breast image in which the proportion of the subject area in the image data is relatively small, various processes are performed only on the necessary subject area to improve the efficiency of the image processing.

以下、***画像を一例として、従来の医用画像処理装置により行われる画像処理について具体的に説明する。図4は、***画像に施される画像処理を説明する図である。図4に示すように、***画像の画像データから診断上重要となる被写体領域を認識し、これを関心領域として設定する。次いで、例えば、公知の画像抽出技術を利用して(例えば、特許文献1〜3参照)、関心領域を抽出し、又は非関心領域にマスク処理を行い、関心領域内の画像データに階調処理、ダイナミック圧縮処理、周波数強調処理等の各種画像処理を施す。また、非関心領域内の画像データには、当該領域を所定の濃度値以上、例えば、関心領域における最小濃度値より高濃度の値に変換する黒化処理を施す。この黒化処理は、観察時にフィルムを透過するシャウカステンの光の影響を抑えるために行われるものである。そして、各種画像処理を施した関心領域と、黒化処理を施した非関心領域とを合成し、画像データとして出力していた。
特開平8−130629号公報 特開平9−37058号公報 特開2003ー190128号公報
Hereinafter, image processing performed by a conventional medical image processing apparatus will be specifically described with a breast image as an example. FIG. 4 is a diagram illustrating image processing performed on a breast image. As shown in FIG. 4, a subject region that is important for diagnosis is recognized from image data of a breast image, and this is set as a region of interest. Next, for example, using a known image extraction technique (see, for example, Patent Documents 1 to 3), a region of interest is extracted or a non-region of interest is masked, and gradation processing is performed on image data in the region of interest. Various image processing such as dynamic compression processing and frequency enhancement processing are performed. Further, the image data in the non-interest region is subjected to blackening processing for converting the region to a density value equal to or higher than a predetermined density value, for example, higher than the minimum density value in the region of interest. This blackening process is performed in order to suppress the influence of the light of the Saucusten that passes through the film during observation. Then, the region of interest subjected to various image processing and the non-region of interest subjected to blackening processing are synthesized and output as image data.
JP-A-8-130629 Japanese Patent Laid-Open No. 9-37058 Japanese Patent Laid-Open No. 2003-190128

しかしながら、上述した従来の画像処理方法にあっては、非関心領域の画像データについて、一律に黒化処理が施されるため、診断上必要となる医用画像に関する情報までもが失われてしまう場合がある。例えば、図4に示す***画像の場合、非関心領域には、医用画像に関する情報として、***の左右に関する情報(例えば、R又はL)、撮影方向に関する情報(例えば、***斜位方向:MLO、***斜位方向:MLO、***上下位方向:CC、***上下位方向:CC)、画像の上下方向に関する情報(例えば、↑,↓)等のマーカ情報が記録されているが、黒化処理を施すことにより、これらのマーカ情報が失われることとなる。黒化処理によりマーカ情報が消失すると、***画像の左右、撮影方向、画像データの上下方向の特定が困難となり、正確な診断が行えない場合が生じる。   However, in the above-described conventional image processing method, since the blackening process is uniformly performed on the image data of the non-interested region, even information related to the medical image necessary for diagnosis is lost. There is. For example, in the case of the breast image shown in FIG. 4, in the non-interest region, information on the left and right of the breast (for example, R or L), information on the imaging direction (for example, breast oblique direction: MLO, Marker information such as breast oblique direction: MLO, breast upper lower direction: CC, breast upper lower direction: CC) and information on the vertical direction of the image (for example, ↑, ↓) is recorded. By applying, the marker information is lost. If the marker information disappears due to the blackening process, it becomes difficult to specify the left and right of the breast image, the imaging direction, and the vertical direction of the image data, and accurate diagnosis may not be performed.

本発明の課題は、必要な情報を保持したまま効率良く医用画像に画像処理を施すことが可能な画像処理装置及び画像処理方法を提供することである。   An object of the present invention is to provide an image processing apparatus and an image processing method capable of efficiently performing image processing on a medical image while retaining necessary information.

上記課題を解決するために、請求項1記載の発明は、
被写体を撮影した医用画像に画像処理を施す画像処理装置であって、
前記医用画像から被写体を含む領域を抽出し、被写体を含む領域と、その他の領域とに分割する分割手段と、
前記分割された被写体を含む領域と、その他の領域とに応じて、異なる画像処理を施す画像処理手段と、
を備えることを特徴としている。
In order to solve the above problem, the invention according to claim 1
An image processing apparatus that performs image processing on a medical image obtained by photographing a subject,
A dividing unit that extracts a region including a subject from the medical image and divides the region into a region including the subject and another region;
Image processing means for performing different image processing depending on the area including the divided subject and the other areas;
It is characterized by having.

請求項2記載の発明は、請求項1記載の画像処理装置において、
前記画像処理手段は、前記被写体を含む領域に、階調処理、ダイナミックレンジ圧縮処理、周波数強調処理のうち少なくとも1以上の画像処理を施し、前記その他の領域に、階調処理を施すことを特徴としている。
The invention according to claim 2 is the image processing apparatus according to claim 1,
The image processing means performs at least one or more of image processing among gradation processing, dynamic range compression processing, and frequency enhancement processing on an area including the subject, and performs gradation processing on the other area. It is said.

請求項3記載の発明は、請求項1又は2記載の画像処理装置において、
前記その他の領域には、医用画像に関する情報が含まれることを特徴としている。
The invention according to claim 3 is the image processing apparatus according to claim 1 or 2,
The other area includes information on a medical image.

請求項4記載の発明は、
被写体を撮影した医用画像に画像処理を施す画像処理方法であって、
前記医用画像から被写体を含む領域を抽出し、被写体を含む領域と、その他の領域とに分割する工程と、
前記分割された被写体を含む領域と、その他の領域とに応じて、異なる画像処理を施す工程と、
を含むことを特徴としている。
The invention according to claim 4
An image processing method for performing image processing on a medical image obtained by photographing a subject,
Extracting a region including a subject from the medical image and dividing the region into a region including the subject and another region;
Applying different image processing depending on the area including the divided subject and the other areas;
It is characterized by including.

請求項5記載の発明は、請求項4記載の画像処理方法において、
前記被写体を含む領域に、階調処理、ダイナミックレンジ圧縮処理、周波数強調処理のうち少なくとも1以上の画像処理を施し、前記その他の領域に、階調処理を施すことを特徴としている。
The invention according to claim 5 is the image processing method according to claim 4,
The region including the subject is subjected to at least one image processing among gradation processing, dynamic range compression processing, and frequency enhancement processing, and gradation processing is performed on the other regions.

請求項6記載の発明は、請求項4又は5記載の画像処理方法において、
前記その他の領域には、医用画像に関する情報が含まれることを特徴としている。
The invention according to claim 6 is the image processing method according to claim 4 or 5,
The other area includes information on a medical image.

請求項1又は4記載の発明によれば、被写体を撮影した医用画像に画像処理を施す画像処理装置であって、医用画像から被写体を含む領域を抽出し、被写体を含む領域と、その他の領域とに分割し、分割された被写体を含む領域と、その他の領域とに応じて、異なる画像処理を施すため、例えば、被写体を含む領域には、各種画像処理を施し、その他の領域には、簡易な画像処理を施すことにより、画像データに含まれる情報を保持したまま、画像処理全体の処理効率を向上させることができる。   According to the first or fourth aspect of the present invention, there is provided an image processing apparatus that performs image processing on a medical image obtained by photographing a subject, extracting a region including the subject from the medical image, a region including the subject, and other regions In order to perform different image processing depending on the region including the divided subject and the other region, for example, various image processing is performed on the region including the subject, By performing simple image processing, it is possible to improve the processing efficiency of the entire image processing while retaining the information included in the image data.

請求項2又は5記載の発明によれば、診断上高精細な画像が必要とされる被写体を含む領域に各種画像処理を施して、医用画像の画質を高めるとともに、その他の領域については、階調処理を施すことで、最低限必要な情報を保持することにより、画像処理に係る手間および時間を短縮して、診断に適した医用画像を提供することができる。   According to the second or fifth aspect of the invention, various image processing is performed on an area including a subject for which a high-definition image is required for diagnosis to improve the image quality of the medical image. By performing the adjustment processing, it is possible to provide a medical image suitable for diagnosis by reducing the labor and time related to the image processing by holding the minimum necessary information.

請求項3又は6記載の発明によれば、他の領域に施される画像処理により医用画像に関する情報が失われることがなく、医用画像に関する情報に基づいて、的確な診断を行うことができる。   According to the third or sixth aspect of the present invention, information relating to the medical image is not lost due to image processing performed on another region, and accurate diagnosis can be performed based on the information relating to the medical image.

以下、図1〜図4を参照して本発明の実施の形態を詳細に説明する。ただし、発明の範囲は、図示例に限定されない。なお、本実施の形態において、医用画像の一例として、***画像に画像処理を施す場合を説明するが、医用画像はこれに限定されない。   Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. However, the scope of the invention is not limited to the illustrated examples. In the present embodiment, a case where image processing is performed on a breast image will be described as an example of a medical image, but the medical image is not limited to this.

まず、本実施の形態の構成を説明する。
本発明を適応した画像処理装置は、例えば、図1に示すような画像処理装置1に用いられる。図1に示すように、画像処理装置1は、制御部11、入力部12、表示部13、通信部14、RAM15、画像処理部16、記憶部17等を備えて構成され、各部はバスにより接続されている。
First, the configuration of the present embodiment will be described.
An image processing apparatus to which the present invention is applied is used, for example, in an image processing apparatus 1 as shown in FIG. As shown in FIG. 1, the image processing apparatus 1 includes a control unit 11, an input unit 12, a display unit 13, a communication unit 14, a RAM 15, an image processing unit 16, a storage unit 17, and the like. It is connected.

制御部11は、記憶部17に記憶されているシステムプログラムを読み出し、RAM15内に形成されたワークエリアに展開し、該システムプログラムに従って各部を制御する。具体的に、制御部11は、記憶部17に記憶されている本発明に係る画像処理プログラムを始めとする各種処理プログラム、各種アプリケーションプログラムを読み出してワークエリアに展開し、後述する画像処理(図2参照)を始めとする各種処理を実行する。   The control unit 11 reads out the system program stored in the storage unit 17, develops it in a work area formed in the RAM 15, and controls each unit according to the system program. Specifically, the control unit 11 reads out various processing programs such as the image processing program according to the present invention stored in the storage unit 17 and various application programs, develops them in a work area, and performs image processing (see FIG. 2) and other various processes are executed.

入力部12は、カーソルキー、数字入力キー、及び各種機能キー等を備えたキーボードと、マウス等のポインティングデバイスを備えて構成され、キーボードに対するキー操作やマウス操作により入力された指示信号を制御部11に出力する。また、入力部12は、表示部13の表示画面にタッチパネルを備えても良く、この場合、タッチパネルを介して入力された指示信号を制御部11に出力する。   The input unit 12 includes a keyboard having cursor keys, numeric input keys, various function keys, and the like, and a pointing device such as a mouse, and controls an instruction signal input by key operation or mouse operation on the keyboard. 11 is output. The input unit 12 may include a touch panel on the display screen of the display unit 13. In this case, the input unit 12 outputs an instruction signal input via the touch panel to the control unit 11.

表示部13は、LCD(Liquid Crystal Display)やCRT(Cathode Ray Tube)等のモニタにより構成され、制御部11から入力される表示信号の指示に従って、入力部12からの入力指示やデータ等を表示する。   The display unit 13 is configured by a monitor such as an LCD (Liquid Crystal Display) or a CRT (Cathode Ray Tube), and displays input instructions, data, and the like from the input unit 12 in accordance with display signal instructions input from the control unit 11. To do.

通信部14は、LANアダプタやルータやTA等を備え、ネットワークNに接続された各装置との間の通信を制御する。ここで、ネットワークNは、LAN(Local Area Network)やWAN(Wide Area Network)、インターネット等の様々な回線形態を適用可能である。なお、病院等の医療機関内で許可されるのであれば、無線通信や赤外線通信であってもよいが、重要な患者情報を含むため、送受信される情報は暗号化することが好ましい。また、病院内の通信方式としては、一般的に、DICOM(Digital Image and Communications in Medicine)規格が用いられており、上述したネットワークN上の各装置間の通信では、DICOM MWM(Modality Worklist Management)やDICOM MPPS(Modality Performed Procedure Step)が用いられる。   The communication unit 14 includes a LAN adapter, a router, a TA, and the like, and controls communication with each device connected to the network N. Here, as the network N, various line forms such as a LAN (Local Area Network), a WAN (Wide Area Network), and the Internet can be applied. Note that wireless communication or infrared communication may be used as long as it is permitted within a medical institution such as a hospital. However, since important patient information is included, it is preferable to encrypt information to be transmitted and received. Moreover, as a communication system in a hospital, the DICOM (Digital Image and Communications in Medicine) standard is generally used, and in the communication between each device on the network N described above, DICOM MWM (Modality Worklist Management). Or DICOM MPPS (Modality Performed Procedure Step).

具体的に、通信部14は、ネットワークNを介して、撮影オーダ情報、カセッテIDに対応付けられた撮影情報、カセッテIDに対応付けられた医用画像の画像データ等を受信する。また、画像処理が施された医用画像の画像データを図示しない画像記録装置等に送信する。   Specifically, the communication unit 14 receives via the network N imaging order information, imaging information associated with a cassette ID, image data of a medical image associated with a cassette ID, and the like. In addition, the image data of the medical image that has been subjected to image processing is transmitted to an image recording apparatus (not shown) or the like.

RAM15は、制御部11により実行制御される各種処理において、記憶部17から読み出された制御部11で実行可能な各種プログラム、入力若しくは出力データ、及びパラメータ等の一時的に記憶するワークエリアを形成する。   The RAM 15 temporarily stores a work area that temporarily stores various programs, input or output data, parameters, and the like that can be executed by the control unit 11 read from the storage unit 17 in various processes controlled by the control unit 11. Form.

画像処理部16は、制御手段11の制御に応じて、記憶部17から画像データを読み出して、診断に適した医用画像となるように各種画像処理を施して、処理済みの医用画像データを記憶部17に出力する。   The image processing unit 16 reads the image data from the storage unit 17 according to the control of the control unit 11, performs various image processes so as to obtain a medical image suitable for diagnosis, and stores the processed medical image data. To the unit 17.

具体的に、画像処理部16は、画像データを読み込むと、画像データから被写体領域を抽出して、これを関心領域として設定し、その他の領域を非関心領域として、各領域を分割する。そして、関心領域又は非関心領域に応じて、各領域の画像データに画像処理を施す。この画像処理には、例えば、画像のコントラストを調整する階調処理、鮮鋭度を調整する周波数処理やダイナミックレンジの広い画像を被写体の細部のコントラストを低下させることなく見やすい濃度範囲に収めるためのダイナミックレンジ圧縮処理、特定の周波数成分を強調して画像を観察し易くする周波数強調処理等が含まれる。   Specifically, when reading the image data, the image processing unit 16 extracts a subject area from the image data, sets this as a region of interest, and divides each region using the other regions as non-regions of interest. Then, image processing is performed on the image data of each region according to the region of interest or the non-region of interest. This image processing includes, for example, gradation processing that adjusts the contrast of the image, frequency processing that adjusts the sharpness, and dynamic images that allow a wide dynamic range image to be displayed in an easy-to-view density range without reducing the contrast of the details of the subject. A range compression process, a frequency enhancement process that enhances a specific frequency component to make it easy to observe an image, and the like are included.

記憶部17は、HDD(Hard Disc Drive)や不揮発性の半導体メモリ等により構成され、制御部11で実行されるシステムプログラム、当該システムプログラムに対応する、画像合成処理プログラム、画像処理プログラムを始めとする各種処理プログラム、各種アプリケーションプログラム、各種データ等を記憶する。これらの各種プログラムは、読取可能なプログラムコードの形態で格納され、制御部11は、当該プログラムコードに従った動作を逐次実行する。   The storage unit 17 includes an HDD (Hard Disc Drive), a nonvolatile semiconductor memory, and the like, and includes a system program executed by the control unit 11, an image synthesis processing program corresponding to the system program, an image processing program, and the like. Various processing programs, various application programs, various data, and the like are stored. These various programs are stored in the form of readable program codes, and the control unit 11 sequentially executes operations according to the program codes.

次に、本実施の形態の動作を説明する。
なお、後述するフローチャートに記述されている各機能を実現するためのプログラムはコンピュータが読み取り可能なプログラムコードの形態で画像処理装置1の記憶部17に格納されており、画像処理装置1の制御部11は、当該プログラムコードに従った動作を逐次実行する。
Next, the operation of the present embodiment will be described.
A program for realizing each function described in the flowcharts described later is stored in the storage unit 17 of the image processing apparatus 1 in the form of a computer readable program code, and the control unit of the image processing apparatus 1 11 sequentially executes operations according to the program code.

図2及び図3を参照して、制御部11により実行される画像処理について説明する。
図2は、画像処理装置1の制御部11により実行される画像処理を示すフローチャートであり、図3は、画像データに施される画像処理例を示す図である。まず、図2に示すように、制御部11の制御に応じて、画像処理部16に画像データが入力されると(ステップS1)、画像処理部16は画像データを読み込む。
Image processing executed by the control unit 11 will be described with reference to FIGS. 2 and 3.
FIG. 2 is a flowchart illustrating image processing executed by the control unit 11 of the image processing apparatus 1, and FIG. 3 is a diagram illustrating an example of image processing performed on image data. First, as shown in FIG. 2, when image data is input to the image processing unit 16 under the control of the control unit 11 (step S1), the image processing unit 16 reads the image data.

ここで、図3(a)に示すように、画像データの一部には、医用画像に関する情報として、***の左右に関する情報、撮影方向に関する情報、画像の上下方向に関する情報等を示すマーカ情報1Aが含まれている。具体的に、マーカ情報1Aには、被写体である***の左右を示す情報として「R」の文字データ、被写体の撮影方向を示す情報として「MLO」の文字データ、画像データ画像の上下方向に関する情報として「↑」の記号データが含まれている。   Here, as shown in FIG. 3A, a part of the image data includes marker information 1A indicating information on the left and right of the breast, information on the imaging direction, information on the vertical direction of the image, and the like as information on the medical image. It is included. Specifically, the marker information 1A includes “R” character data as information indicating the left and right of the subject breast, “MLO” character data as information indicating the photographing direction of the subject, and information regarding the vertical direction of the image data image. The symbol data of “↑” is included.

次いで、画像処理部16は、読み込んだ画像データから被写体領域を認識して、これを関心領域に設定する(ステップS2)。続いて、画像処理部16は、認識した関心領域を画像データから分割して抽出することにより、関心領域と非関心領域との分割処理を行う(ステップS3)。図3(b)は、画像データから被写体領域が関心領域に設定され、関心領域2Aと非関心領域3Aが分割された例を示す図である。   Next, the image processing unit 16 recognizes a subject area from the read image data and sets it as a region of interest (step S2). Subsequently, the image processing unit 16 performs a division process of the region of interest and the non-region of interest by dividing and extracting the recognized region of interest from the image data (step S3). FIG. 3B is a diagram showing an example in which the subject region is set as the region of interest from the image data, and the region of interest 2A and the non-region of interest 3A are divided.

図2に戻り、画像処理部16は、分割した関心領域2Aに、階調処理、ダイナミックレンジ圧縮処理、周波数強調処理等の各種画像処理を施す(ステップS4)。図3(c)は、関心領域2Aに各種画像処理が施された場合の一例を示す図である。続いて、画像処理部16は、分割した非関心領域3Aに階調処理を施す(ステップS5)。ここで、図4を参照して、階調処理について説明する。   Returning to FIG. 2, the image processing unit 16 performs various image processing such as gradation processing, dynamic range compression processing, and frequency enhancement processing on the divided region of interest 2A (step S4). FIG. 3C is a diagram illustrating an example when various image processes are performed on the region of interest 2A. Subsequently, the image processing unit 16 performs gradation processing on the divided non-interest area 3A (step S5). Here, the gradation processing will be described with reference to FIG.

図4(a)〜図4(e)は、非関心領域に施される階調処理を説明する図である。図(a)は、関心領域2Aと非関心領域3Aが分割され、関心領域2Aに各種画像処理が施された例を示す図であり、図4(b)は、関心領域3Aの信号ヒストグラムを示す図である。図4(b)において、横軸は、画像データの濃度を示しており、縦軸は、画像データの対応する濃度の出現頻度を示している。図4(b)に示すように、信号ヒストグラムには、2つのピークS0,S1が出現しており、ピークS0は濃度の低い被写体部分の濃度に対応し、ピークS1はその他の部分、つまり、被写体が存在しないために放射線が透過したベタ部領域の濃度に対応している。 FIG. 4A to FIG. 4E are diagrams for explaining gradation processing performed on a non-interest area. FIG. 4A is a diagram showing an example in which the region of interest 2A and the non-region of interest 3A are divided, and various types of image processing are performed on the region of interest 2A, and FIG. 4B is a signal histogram of the region of interest 3A. FIG. In FIG. 4B, the horizontal axis indicates the density of the image data, and the vertical axis indicates the appearance frequency of the corresponding density of the image data. As shown in FIG. 4B, two peaks S 0 and S 1 appear in the signal histogram, the peak S 0 corresponds to the density of the low-density subject portion, and the peak S 1 is the other peak. This corresponds to the density of the solid portion area where the radiation is transmitted because the portion, that is, the subject does not exist.

また、図4(c)は、非関心領域3Aの信号ヒストグラムを示す図である。図4(b)と同様図4(c)においても、横軸は、画像データの濃度を示しており、縦軸は、画像データの対応する濃度の出現頻度を示している。図4(c)に示すように、信号ヒストグラムには、2つのピークS2,S3が出現しており、ピークS2はベタ部領域の濃度に対応し、ピークS3はマーカ情報1Aの濃度に対応している。 FIG. 4C shows a signal histogram of the non-interest area 3A. Similar to FIG. 4B, also in FIG. 4C, the horizontal axis indicates the density of the image data, and the vertical axis indicates the appearance frequency of the corresponding density of the image data. As shown in FIG. 4C, two peaks S 2 and S 3 appear in the signal histogram, the peak S 2 corresponds to the density of the solid area, and the peak S 3 is the marker information 1A. Corresponds to the concentration.

ここで、非関心領域に施す階調処理は、マーカ情報1Aの濃度を保持したまま、関心領域のベタ部領域と、非関心領域のベタ部領域との濃度を一致させるために行うものである。具体的には、信号ヒストグラムに示す非関心領域のピークS3を現在の濃度位置に保ったまま、非関領域のピークS2を関心領域のピークS1に一致させる処理である。この階調処理は、図4(e)に示す信号値変換テーブルを用いて非関心領域の信号値を変換することにより行われる。この結果、図4(d)に示すように、マーカ情報1Aに対応するピークS3を元の濃度位置に保ったまま、非関心領域のベタ部領域に対応するピークS2を、関心領域のベタ部領域に対応するピークS1に一致させた信号ヒストグラムが得られる。 Here, the gradation processing applied to the non-interest area is performed in order to make the density of the solid area of the area of interest and the solid area of the non-interest area coincide with each other while maintaining the density of the marker information 1A. . Specifically, it is a process of matching the peak S 2 of the non-interesting region with the peak S 1 of the region of interest while keeping the peak S 3 of the non-interesting region shown in the signal histogram at the current density position. This gradation processing is performed by converting the signal value of the non-interest region using the signal value conversion table shown in FIG. As a result, as shown in FIG. 4 (d), while maintaining the peak S 3 corresponding to the marker information 1A to the original concentration position, the peak S 2 corresponding to the solid region of the non-ROI, the ROI A signal histogram matched with the peak S 1 corresponding to the solid area is obtained.

図2に戻り、各種画像処理を施した関心領域2Aと階調処理のみを施した非関心領域3Aとを合成して、画像データを生成する(ステップS6)。図3(d)は、生成された画像データ4Aの一例を示す図である。そして、合成した画像データを記憶部17に記憶させ(ステップS7)、本画像処理を終了する。   Returning to FIG. 2, the region of interest 2A subjected to various image processing and the non-region of interest 3A subjected to only the gradation processing are synthesized to generate image data (step S6). FIG. 3D is a diagram illustrating an example of the generated image data 4A. Then, the synthesized image data is stored in the storage unit 17 (step S7), and the main image processing is ended.

以上のように、本実施の形態によれば、画像データに各種画像処理を施す場合、診断対象となる被写体が含まれる領域を認識して関心領域に設定し、関心領域以外の領域を非関心領域に設定して各領域を分割し、分割したそれぞれの領域に対応する各種処理を施す。つまり、関心領域には、画像診断に耐え得る高精細な画像とするため、階調処理、ダイナミックレンジ圧縮処理、周波数強調処理等の各種画像処理を施し、非関心領域には、画像コントラストを調整するための階調処理を施す。   As described above, according to the present embodiment, when various types of image processing are performed on image data, a region including a subject to be diagnosed is recognized and set as a region of interest, and regions other than the region of interest are not interested. Each area is divided by setting the area, and various processes corresponding to the divided areas are performed. In other words, in order to make the region of interest a high-definition image that can withstand image diagnosis, various image processing such as gradation processing, dynamic range compression processing, and frequency enhancement processing is performed, and image contrast is adjusted for the non-interest region. Gradation processing is performed.

したがって、診断に必要となる被写体を含む関心領域のみに各種画像処理を施して高精細な画質とし、他の非関心領域には最低限必要となるマーカ情報を消失させることのない階調処理を施して、画像データ全体を効率よく処理することができる。これにより、画像処理後の画像データについて、診断上必要となる情報を保持したままその後の処理を行うことができるため、例えば、画像データをフィルムに記録して読影診断を行う場合、被写体の部位や撮影方向、画像データの方向等を容易に特定可能とし、正確な診断を行うことができる。   Therefore, various image processing is performed only on the region of interest including the subject necessary for diagnosis to achieve high-definition image quality, and gradation processing that does not lose marker information that is at least necessary for other non-interest regions is performed. As a result, the entire image data can be processed efficiently. As a result, subsequent processing can be performed on image data after image processing while retaining information necessary for diagnosis. For example, when image interpretation is performed by recording image data on a film, the region of the subject In addition, it is possible to easily specify the shooting direction, the direction of image data, and the like, and to perform accurate diagnosis.

なお、上述した本実施の形態における記述は、本発明に係る好適な画像処理装置の一例であり、これに限定されるものではない。例えば、上述した実施の形態においては、***画像に画像処理を施す場合を例として説明を行ったが、***画像に限らず、種々の医用画像に本発明を適用可能なことは勿論である。   Note that the description in the present embodiment described above is an example of a suitable image processing apparatus according to the present invention, and the present invention is not limited to this. For example, in the above-described embodiment, the case where image processing is performed on a breast image has been described as an example. However, the present invention is naturally applicable to various medical images as well as breast images.

また、上述した実施の形態においては、関心領域に施す画像処理の一例として、階調処理、ダイナミックレンジ圧縮処理、周波数強調処理を施す場合について説明を行ったが、行われる画像処理はこれらに限定されない。例えば、コントラスト補正処理、濃度補正処理等の各種処理を適用可能である。また、非関心領域に施される画像処理も階調処理に限られない。すなわち、非関心領域に施される画像処理は、必要な情報を保持可能な処理であって、少なくとも関心領域に施される画像処理よりも簡易な処理であればよい。   In the above-described embodiment, the case where gradation processing, dynamic range compression processing, and frequency enhancement processing are performed is described as an example of image processing performed on the region of interest. However, the image processing performed is limited to these. Not. For example, various processes such as a contrast correction process and a density correction process can be applied. Further, the image processing applied to the non-interest area is not limited to the gradation processing. In other words, the image processing performed on the non-interest region may be processing that can hold necessary information and is simpler than at least image processing performed on the region of interest.

その他、本実施の形態における画像処理装置1の各構成要素の細部構成及び細部動作に関しては、本発明の趣旨を逸脱することのない範囲で適宜変更可能であることはもちろんである。   In addition, it is needless to say that the detailed configuration and detailed operation of each component of the image processing apparatus 1 according to the present embodiment can be appropriately changed without departing from the spirit of the present invention.

本発明を適用した実施の形態における画像処理装置1の要部構成を示すブロック図である。It is a block diagram which shows the principal part structure of the image processing apparatus 1 in embodiment to which this invention is applied. 図1に示す制御部11により実行される画像処理を示すフローチャートである。It is a flowchart which shows the image process performed by the control part 11 shown in FIG. 画像処理を施された画像データの一例を示す図である。It is a figure which shows an example of the image data to which the image process was performed. 非関心領域に施される階調処理を説明する図である。It is a figure explaining the gradation process performed to a non-interest area | region. 従来の画像処理方法を説明する図である。It is a figure explaining the conventional image processing method.

符号の説明Explanation of symbols

1 画像処理装置1
11 制御部
12 入力部
13 表示部
14 通信部
15 RAM
16 画像処理部
17 記憶部
N ネットワーク
1 Image processing device 1
11 Control unit 12 Input unit 13 Display unit 14 Communication unit 15 RAM
16 Image processing unit 17 Storage unit N Network

Claims (6)

被写体を撮影した医用画像に画像処理を施す画像処理装置であって、
前記医用画像から被写体を含む領域を抽出し、被写体を含む領域と、その他の領域とに分割する分割手段と、
前記分割された被写体を含む領域と、その他の領域とに応じて、異なる画像処理を施す画像処理手段と、
を備えることを特徴とする画像処理装置。
An image processing apparatus that performs image processing on a medical image obtained by photographing a subject,
A dividing unit that extracts a region including a subject from the medical image and divides the region into a region including the subject and another region;
Image processing means for performing different image processing depending on the area including the divided subject and the other areas;
An image processing apparatus comprising:
前記画像処理手段は、前記被写体を含む領域に、階調処理、ダイナミックレンジ圧縮処理、周波数強調処理のうち少なくとも1以上の画像処理を施し、前記その他の領域に、階調処理を施すことを特徴とする請求項1記載の画像処理装置。   The image processing means performs at least one or more of image processing among gradation processing, dynamic range compression processing, and frequency enhancement processing on an area including the subject, and performs gradation processing on the other area. The image processing apparatus according to claim 1. 前記その他の領域には、医用画像に関する情報が含まれることを特徴とする請求項1又は2記載の画像処理装置。   The image processing apparatus according to claim 1, wherein the other area includes information related to a medical image. 被写体を撮影した医用画像に画像処理を施す画像処理方法であって、
前記医用画像から被写体を含む領域を抽出し、被写体を含む領域と、その他の領域とに分割する工程と、
前記分割された被写体を含む領域と、その他の領域とに応じて、異なる画像処理を施す工程と、
を含むことを特徴とする画像処理方法。
An image processing method for performing image processing on a medical image obtained by photographing a subject,
Extracting a region including a subject from the medical image and dividing the region into a region including the subject and another region;
Applying different image processing depending on the area including the divided subject and the other areas;
An image processing method comprising:
前記被写体を含む領域に、階調処理、ダイナミックレンジ圧縮処理、周波数強調処理のうち少なくとも1以上の画像処理を施し、前記その他の領域に、階調処理を施すことを特徴とする請求項4記載の画像処理方法。   5. The area including the subject is subjected to at least one image processing among gradation processing, dynamic range compression processing, and frequency enhancement processing, and gradation processing is performed on the other regions. Image processing method. 前記その他の領域には、医用画像に関する情報が含まれることを特徴とする請求項4又は5記載の画像処理方法。   6. The image processing method according to claim 4, wherein the other area includes information on a medical image.
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