JP2004133736A - Medical image display method and device thereof - Google Patents

Medical image display method and device thereof Download PDF

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Publication number
JP2004133736A
JP2004133736A JP2002298361A JP2002298361A JP2004133736A JP 2004133736 A JP2004133736 A JP 2004133736A JP 2002298361 A JP2002298361 A JP 2002298361A JP 2002298361 A JP2002298361 A JP 2002298361A JP 2004133736 A JP2004133736 A JP 2004133736A
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Prior art keywords
image
narrow
blood vessel
display
area
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JP4298258B2 (en
JP2004133736A5 (en
Inventor
Takashi Shirohata
白旗 崇
Yuko Aoki
青木 佑子
Hiromitsu Hayashi
林 宏光
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Hitachi Healthcare Manufacturing Ltd
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Hitachi Medical Corp
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  • Magnetic Resonance Imaging Apparatus (AREA)
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a medical image display device which can easily discriminate and display a morbid portion like a blood vessel constriction. <P>SOLUTION: The position of the boundary between a noticed internal organ and others is set, by using an input device 2, on a narrow-area image displayed on a display device 3, and the set display position and the quantity representative of a shape are correlated to each other. The narrow-area image is subjected to image emphasis processing in accordance with the quantity which is representative of the shape and correlated to the set display position, and the narrow-area image subjected to the image emphasis processing is displayed on the display device 3. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明が属する技術分野】
本発明は、X線CT画像やMRI画像などの医用画像の臓器形状の診断に係り、特に画像強調処理により臓器形状の変化の診断能を向上する技術に関する。
【0002】
【従来の技術】
従来の医用画像表示装置には、医用画像中にある血管、腸などの管状臓器の狭窄やねじれを定量的に診断したいという要望があった。
例えば、[非特許文献1]に示されるように、血管中心軸に沿ったX線CTの再構成画像、血管中心軸に直交する血管断面像および血管径を表示していた。
【0003】
【非特許文献1】
医療と画像の総合情報誌 インナービジョン 第17巻第4号、第24〜28頁、(株)医療科学社発行。
【0004】
【発明が解決しようとする課題】
しかしながら、[非特許文献1]に開示された従来技術では、単に血管の断面積の大きさだけに注目しているので、複数の血管が血管中心軸に直交する線上に有って、その何れかの血管が末梢血管のように元来細い血管であったとき、その血管は狭窄を起こしているのか、正常な末梢血管なのかという区別ができない点に配慮がなされていなかった。
【0005】
本発明の目的は、血管狭窄などの病変部を容易に識別表示可能な医用画像表示を提供することにある。
【0006】
【課題を解決するための手段】
上記目的は、表示された医用画像の注目臓器に関して広域に撮像した広域画像から病変部を含む部位を抽出し、該抽出された部位に関する狭域画像を表示器に表示し、該表示された狭域画像を用いてその部位の形状を表す特徴量を算出し、その形状を表す特徴量を前記表示器に前記狭域画像と共に表示する医用画像表示で、前記狭域画像の注目臓器とその注目臓器の他との境界の位置を前記表示器に表示された狭域画像上に設定し、該設定された表示位置と前記形状を表す特徴量を対応づけ、該対応づけられた形状を表す特徴量に応じて前記狭域画像に画像強調処理を施し、該画像強調処理が施された狭域画像を前記表示器に表示することで達成される。
【0007】
また、前記形状を表す特徴量の大きさに応じた閾値を設定し、前記設定された閾値に応じて前記狭域画像に画像強調処理を施してもよい。
【0008】
【発明の実施の形態】
本発明について図面を用いて説明する。
図1は本発明の医用画像表示装置の一例を示すブロック図、図2は図1の制御部の一例を示すブロック図である。これらは、後で説明する複数の実施形態で共通するものである。ここでは、形状を表す特徴量の一例として、断面積を用いた例を説明する。
【0009】
医用画像表示装置は、図1に示すように、制御装置1が、入力装置2、表示器3、記憶装置4にそれぞれ接続されている。ここでは、装置の構成を簡単にするために、制御装置1に接続されるネットワークの図示は省略するが、勿論図示されないネットワークからの医用画像を含むデータ等の送受信は、本発明に含まれる。
【0010】
制御装置1は、入力装置2又は記憶装置4から入力される操作情報又は画像情報を制御して、表示器3に出力したり、出力された表示情報を記憶装置4に記憶したりするものである。入力装置2は、マウス、トラックボールに代表されるポインティングデバイスおよびキーボードであって、例えば操作者が表示器3の表示情報を元に画像処理を施すための操作情報を設定する。表示器3は、CRTモニタや液晶モニタなどであって、前記操作情報を入力するための医用画像を表示したり、前記操作情報に基づき処理された画像を表示したりする。記憶装置4は、X線CT装置などの医用画像診断装置で撮像した医用画像を記憶したり、前記操作情報に基づき処理された画像を記憶したりする。
【0011】
上記制御装置1は、図2に示すように、入力装置2、記憶装置4にそれぞれ接続される広域血管像記憶部11と、入力装置2に接続される血管節位置情報記憶部12と、広域血管像記憶部11、血管節位置情報記憶部12にそれぞれ接続される狭域血管像記憶部13と、狭域血管像記憶部13に接続される断面積算出部14と、狭域血管像記憶部13、断面積算出部14にそれぞれ接続される画像強調部15とを有している。また、広域血管像記憶部11、狭域血管像記憶部13、画像強調部15は表示器3に接続されている。
【0012】
広域血管像記憶部11は、注目臓器を含む広域の血管像(「広域画像」という)を記憶する。血管節位置情報記憶部12は、広域血管像記憶部11に記憶される血管像を表示器3に表示し、操作者が入力装置2を用いて表示された広域血管像中の所望の血管節を選択、設定し、その設定した血管節の画像上の位置情報を記憶する。狭域血管像記憶部13は、広域血管像上で選択された血管節の間にある血管を狭域血管像として記憶する。断面積算出部14は、狭域血管像から血管壁のCT値と空間分可能などのデータから公知の方法で、血管像の断面積を算出する。画像強調部15は、狭域血管像を断面積の大きさに応じて画像強調処理を施す。ここで、画像強調処理とは、例えば、狭窄やねじれがあればその部分を赤色に色付けしたり、輪郭線強調したりして、病変部を明示するものである。
【0013】
次に、各実施形態での動作についてそれぞれ図面を用いて説明する。
<第1の実施形態>
図3は本発明の第1の実施形態の動作を説明するフローチャート、図4は図3のステップ36の表示例を示す図である。
【0014】
操作者は、入力装置2を操作し、制御部1に広域血管像記憶部11から読み出した広域画像を表示器3に表示させる。(ステップ31)
【0015】
操作者は、入力装置2を操作し、表示器2に表示された広域画像に、所望の血管を選択するために血管節の位置を複数箇所設定する。(ステップ32)
【0016】
制御部1は、前ステップで設定された血管節の間の血管を狭域血管像として表示器3に表示する。(ステップ33)
制御部1は、狭域血管像(又は診断に充分な大きさである広域血管像)の断面積を断面積算出部14に算出させる。(ステップ34)
【0017】
操作者は、表示器3に表示された狭域血管像(又は診断に充分な大きさである広域血管像)に対して血管に他の臓器が分離できているかを確認する。もし、分離できていなければ、注目臓器である血管とその他臓器との境界を指定して血管のみを抽出する。(ステップ35)
【0018】
制御部1は、狭域血管像(又は診断に充分な大きさである広域血管像)に色付け処理を画像強調部15に行わせる(ステップ36)。
【0019】
表示例は、図4に示すように、図面左方に血管の走行方向に沿った血管縦断面を含むX線CT画像40を、図面右方に血管の走行方向の各点における血管横断面(前記縦断面に直交する面)の断面積値のグラフ41をそれぞれ表示している。ここでは断面積の最小値を赤色、最大値を青色、その間の値は赤色から青色までカラー階調をつけて表している。また、カラー階調の尺度を計るためのカラースケール42が図面下方に表示されている。破線43、破線45は入力装置2で測定したい断面積の値の位置へ任意に移動できる表示カーソルである。数値表示領域44、数値表示領域46は、破線43、破線45で指している数値、「647」、「1」(単位は例えば平方ミリメートル)を表している。
【0020】
以上説明したように、本実施形態では、入力装置2によって血管画像の注目臓器とその注目臓器の他との境界の位置を表示器3に表示された血管画像上に設定し、該設定された表示位置と断面積を対応づけ、該対応づけられた断面積に応じて前記血管画像に色付け処理を施し、該色付け処理が施された血管画像を表示器3に表示することで、血管狭窄などの病変部を容易に識別表示可能な医用画像表示を提供できる。
【0021】
<第2の実施形態>
図5は本発明の第2の実施形態の動作を説明するフローチャート、図6は図5のステップ57の表示例を示す図である。
【0022】
操作者は、入力装置2を操作し、制御部1に広域血管像記憶部11から読み出した広域画像を表示器3に表示させる。(ステップ51)
【0023】
操作者は、入力装置2を操作し、表示器2に表示された広域画像に、所望の血管を選択するために血管節の位置を複数箇所設定する。(ステップ52)
【0024】
制御部1は、前ステップで設定された血管節の間の血管を狭域血管像として表示器3に表示する。(ステップ53)
【0025】
制御部1は、狭域血管像(又は診断に充分な大きさである広域血管像)の断面積を断面積算出部14に算出させる。(ステップ54)
【0026】
操作者は、表示器3に表示された狭域血管像(又は診断に充分な大きさである広域血管像)に対して血管に他の臓器が分離できているかを確認する。もし、分離できていなければ、注目臓器である血管とその他臓器との境界を指定して血管のみを抽出する。(ステップ55)
【0027】
操作者は、前記断面積に閾値を設定し、狭域血管像(又は診断に充分な大きさである広域血管像)の画像強調の範囲を設定する。具体的には、表示器3に表示された2つの表示カーソルを、図4に示すような断面積の最大値、最小値の関係から、図6に示すように断面積の範囲を狭める。(ステップ56)
【0028】
制御部1は、閾値が設定された狭域血管像(又は診断に充分な大きさである広域血管像)に色付け処理を画像強調部15に行わせる。(ステップ57)
【0029】
表示例は、図6に示すように、図面左方に血管の走行方向に沿った血管縦断面を含むX線CT画像60を、図面右方に血管の走行方向の各点における血管横断面(前記縦断面に直交する面)の断面積値のグラフ61をそれぞれ表示している。ここでは断面積の最小値を赤色、最大値を青色、その間の値は赤色から青色までカラー階調をつけて表している。また、カラー階調の尺度を計るためのカラースケール62が図面下方に表示されている。破線63、破線65は入力装置2で測定したい断面積の値の位置へ任意に移動できる表示カーソルである。数値表示領域64、数値表示領域66は、破線63、破線65で指している数値、「251」、「1」を表している。
【0030】
以上説明したように、本実施形態では、入力装置2によって血管画像の注目臓器とその注目臓器の他との境界の位置を表示器3に表示された血管画像上に設定し、該設定された表示位置と断面積を対応づけ、断面積の値に閾値を設定し、該設定された閾値の断面積に応じて前記血管画像に色付け処理を施し、該色付け処理が施された血管画像を表示器3に表示することで、血管狭窄などの病変部をより詳細に識別表示可能な医用画像表示を提供できる。つまり、図面左方にある色の分布のように細かな断面積の変化が血管像上の色の違いとして表示できる。
【0031】
<第3の実施形態>
図7は本発明の第3の実施形態の動作を説明するフローチャート、図8は図7のステップ75の表示例を示す図である。
【0032】
操作者は、入力装置2を操作し、制御部1に広域血管像記憶部11から読み出した広域画像又は、狭域血管像記憶部13から読み出した狭域画像を表示器3に表示させる。(ステップ71)
【0033】
制御部1は、狭域血管像(又は診断に充分な大きさである広域血管像)の断面積を断面積算出部14に算出させる。(ステップ72)
【0034】
操作者は、表示器3に表示された狭域血管像(又は診断に充分な大きさである広域血管像)に対して血管に他の臓器が分離できているかを確認する。もし、分離できていなければ、注目臓器である血管とその他臓器との境界を指定して血管のみを抽出する。(ステップ73)
【0035】
操作者は、前記断面積に閾値を設定し、狭域血管像(又は診断に充分な大きさである広域血管像)の画像強調の範囲を設定する。具体的には、表示器3に表示された2つの表示カーソルで図8に示すように断面積の範囲を狭める。(ステップ74)
【0036】
制御部1は、狭域血管像(又は診断に充分な大きさである広域血管像)に輪郭線処理を画像強調部15に行わせる。(ステップ75)
【0037】
表示例は、図8に示すように、図面左方に血管の走行方向に沿った血管縦断面を含むX線CT画像80を、図面右方に血管の走行方向の各点における血管横断面(前記縦断面に直交する面)の断面積値のグラフ81をそれぞれ表示している。破線82は入力装置2で測定したい断面積の値の位置へ任意に移動できる表示カーソルである。数値表示領域84は破線82で指している数値、「51」を表している。85は輪郭強調された部分であり、破線82を画面上で移動すれば、それに連動して数値表示領域84の数値、輪郭強調部分85の範囲が変化する。
【0038】
以上説明したように、本実施形態では、入力装置2によって血管画像の注目臓器とその注目臓器の他との境界の位置を表示器3に表示された画像上に設定し、該設定された表示位置と断面積を対応づけ、該対応づけられた断面積に応じて前記血管画像に輪郭線処理を施し、該輪郭線処理が施された血管画像を表示器3に表示することで、血管狭窄の進行度、治療範囲を直観的に把握できる。
【0039】
また、破線82を移動させれば、表示されている血管80の全域にわたって輪郭線を引くことができるので、注目臓器とその他の臓器との識別が容易になる。
【0040】
また、上記各実施形態では、注目臓器の例として血管で説明したが、腸、その他の管状臓器にも本発明の技術は適用できるものである。
【0041】
また、医用画像としてX線CT画像で説明しているが、MRI画像、超音波画像などあらゆる被検体の断層画像が得られるものであればよい。
【0042】
また、ステップ33、ステップ53、ステップ71では、狭域血管像を表示することとしているが、広域血管像で大きさが診断できる充分な大きさであれば、狭域血管像を表示することを省略することができる。
【0043】
また、画像強調処理は色付け、輪郭強調に限られることなく、要するに病変部がその他の部分より明確に識別表示されるものであればよい。
【0044】
また、医師が患者に治療計画等を説明するインフォームドコンセントにおいて、病変部が他の臓器と異なる色等で画像強調されているので、医用画像の知識の無い患者であっても、容易に理解することができる。
【0045】
また、部位の形状を表す特徴量は断面積を例に説明したが、断面積の他に、曲率や平均半径など部位の形状の特徴を示す量であればそのすべてが適用できる。
【0046】
【発明の効果】
本発明によれば、血管狭窄などの病変部を容易に識別表示可能な医用画像表示を提供するという効果を奏する。
【図面の簡単な説明】
【図1】本発明の医用画像表示装置の一例を示すブロック図。
【図2】図1の制御部の一例を示すブロック図。
【図3】本発明の第1の実施形態の動作を説明するフローチャート。
【図4】図3のステップ36の表示例を示す図。
【図5】本発明の第2の実施形態の動作を説明するフローチャート。
【図6】図5のステップ57の表示例を示す図。
【図7】本発明の第3の実施形態の動作を説明するフローチャート。
【図8】図7のステップ75の表示例を示す図。
【符号の説明】
1…制御装置、2…入力装置、3…出力装置、4…記憶装置
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a diagnosis of an organ shape of a medical image such as an X-ray CT image or an MRI image, and more particularly to a technique for improving a diagnostic capability of a change in an organ shape by image enhancement processing.
[0002]
[Prior art]
There has been a demand for a conventional medical image display apparatus to quantitatively diagnose stenosis and torsion of a tubular organ such as a blood vessel and an intestine in a medical image.
For example, as shown in [Non-Patent Document 1], a reconstructed image of X-ray CT along a blood vessel central axis, a blood vessel cross-sectional image orthogonal to the blood vessel central axis, and a blood vessel diameter are displayed.
[0003]
[Non-patent document 1]
Medical and Image Comprehensive Information Magazine Inner Vision Vol. 17, No. 4, pp. 24-28, published by Medical Science Co., Ltd.
[0004]
[Problems to be solved by the invention]
However, in the related art disclosed in [Non-Patent Document 1], since attention is paid only to the size of the cross-sectional area of a blood vessel, a plurality of blood vessels are on a line orthogonal to the central axis of the blood vessel. When such a blood vessel was originally a thin blood vessel like a peripheral blood vessel, no consideration was given to the fact that it was not possible to distinguish whether the blood vessel was stenotic or a normal peripheral blood vessel.
[0005]
An object of the present invention is to provide a medical image display capable of easily identifying and displaying a lesion such as a vascular stenosis.
[0006]
[Means for Solving the Problems]
The above object is to extract a region including a lesion from a wide-area image of a target organ of a displayed medical image captured in a wide area, display a narrow-area image on the extracted region on a display, and display the displayed narrow-area image. A medical image display that calculates a feature amount representing the shape of the part using the area image and displays the feature amount representing the shape together with the narrow area image on the display device. A position of a boundary with the other organ is set on the narrow-area image displayed on the display device, the set display position is associated with a feature amount representing the shape, and the feature representing the associated shape is set. This is achieved by performing image enhancement processing on the narrow area image according to the amount, and displaying the narrow area image on which the image enhancement processing has been performed on the display.
[0007]
Further, a threshold value may be set in accordance with the magnitude of the feature amount representing the shape, and the narrow area image may be subjected to image enhancement processing in accordance with the set threshold value.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing an example of the medical image display device of the present invention, and FIG. 2 is a block diagram showing an example of a control unit of FIG. These are common to a plurality of embodiments described later. Here, an example using a cross-sectional area will be described as an example of a feature amount representing a shape.
[0009]
In the medical image display device, as shown in FIG. 1, a control device 1 is connected to an input device 2, a display 3, and a storage device 4, respectively. Here, in order to simplify the configuration of the apparatus, illustration of a network connected to the control apparatus 1 is omitted, but transmission and reception of data and the like including medical images from a network not shown are included in the present invention.
[0010]
The control device 1 controls operation information or image information input from the input device 2 or the storage device 4 and outputs the information to the display 3 or stores the output display information in the storage device 4. is there. The input device 2 is a pointing device represented by a mouse, a trackball, and a keyboard, and sets, for example, operation information for an operator to perform image processing based on display information on the display 3. The display 3 is a CRT monitor, a liquid crystal monitor, or the like, and displays a medical image for inputting the operation information, and displays an image processed based on the operation information. The storage device 4 stores a medical image captured by a medical image diagnostic device such as an X-ray CT device, and stores an image processed based on the operation information.
[0011]
As shown in FIG. 2, the control device 1 includes a wide-area vascular image storage unit 11 connected to the input device 2 and the storage device 4, a vascular node position information storage unit 12 connected to the input device 2, A narrow-area blood vessel image storage unit 13 connected to the blood vessel image storage unit 11 and the blood vessel node position information storage unit 12; a cross-sectional area calculation unit 14 connected to the narrow-area blood vessel image storage unit 13; And an image enhancement unit 15 connected to the section 13 and the cross-sectional area calculation unit 14, respectively. The wide area blood vessel image storage unit 11, the narrow area blood vessel image storage unit 13, and the image enhancement unit 15 are connected to the display 3.
[0012]
The wide-area blood vessel image storage unit 11 stores a wide-area blood vessel image including a target organ (referred to as a “wide-area image”). The blood vessel node position information storage unit 12 displays the blood vessel image stored in the wide area blood vessel image storage unit 11 on the display 3, and a desired blood vessel node in the wide area blood vessel image displayed by the operator using the input device 2. Is selected and set, and the position information of the set vascular node on the image is stored. The narrow area blood vessel image storage unit 13 stores a blood vessel between the selected blood vessels on the wide area blood vessel image as a narrow area blood vessel image. The cross-sectional area calculation unit 14 calculates the cross-sectional area of the blood vessel image from the CT image of the blood vessel wall and any data that can be spatially separated from the narrow-area blood vessel image by a known method. The image enhancement unit 15 performs image enhancement processing on the narrow-area blood vessel image according to the size of the cross-sectional area. Here, the image emphasizing process is, for example, a process of coloring a portion of a stenosis or a twist in red or emphasizing a contour line to specify a lesion portion.
[0013]
Next, the operation in each embodiment will be described with reference to the drawings.
<First embodiment>
FIG. 3 is a flowchart for explaining the operation of the first embodiment of the present invention, and FIG. 4 is a diagram showing a display example of step 36 in FIG.
[0014]
The operator operates the input device 2 to cause the control unit 1 to display the wide area image read from the wide area blood vessel image storage unit 11 on the display unit 3. (Step 31)
[0015]
The operator operates the input device 2 and sets a plurality of vascular nodes in the wide area image displayed on the display 2 in order to select a desired blood vessel. (Step 32)
[0016]
The control unit 1 displays the blood vessels between the blood vessel nodes set in the previous step on the display 3 as a narrow-range blood vessel image. (Step 33)
The control unit 1 causes the cross-sectional area calculation unit 14 to calculate the cross-sectional area of a narrow-area blood vessel image (or a wide-area blood vessel image that is large enough for diagnosis). (Step 34)
[0017]
The operator checks whether other organs can be separated into blood vessels from the narrow-area blood vessel image (or a wide-area blood vessel image that is large enough for diagnosis) displayed on the display device 3. If the separation is not possible, the boundary between the blood vessel as the target organ and the other organ is designated, and only the blood vessel is extracted. (Step 35)
[0018]
The control unit 1 causes the image enhancement unit 15 to perform a coloring process on the narrow-area blood vessel image (or a wide-area blood vessel image having a size sufficient for diagnosis) (step 36).
[0019]
In the display example, as shown in FIG. 4, an X-ray CT image 40 including a longitudinal section of the blood vessel along the running direction of the blood vessel is displayed on the left side of the drawing, and a cross-sectional view of the blood vessel at each point in the running direction of the blood vessel (right side of the drawing). The graph 41 of the sectional area value of the plane perpendicular to the longitudinal section) is displayed. Here, the minimum value of the cross-sectional area is represented by red, the maximum value is represented by blue, and values between them are represented by color gradations from red to blue. Further, a color scale 42 for measuring the scale of the color gradation is displayed at the bottom of the drawing. Dashed lines 43 and 45 are display cursors that can be arbitrarily moved to the position of the value of the cross-sectional area to be measured by the input device 2. The numerical value display area 44 and the numerical value display area 46 represent numerical values “647” and “1” (in units of, for example, square millimeters) indicated by broken lines 43 and 45.
[0020]
As described above, in the present embodiment, the position of the target organ of the blood vessel image and the boundary between the target organ and the other target organ are set on the blood vessel image displayed on the display unit 3 by the input device 2, and the input device 2 sets the position. By associating the display position with the cross-sectional area, performing a coloring process on the blood vessel image according to the correlated cross-sectional area, and displaying the blood vessel image on which the coloring process has been performed on the display device 3, such as vascular stenosis. It is possible to provide a medical image display capable of easily identifying and displaying the affected part.
[0021]
<Second embodiment>
FIG. 5 is a flowchart for explaining the operation of the second embodiment of the present invention, and FIG. 6 is a diagram showing a display example of step 57 in FIG.
[0022]
The operator operates the input device 2 to cause the control unit 1 to display the wide area image read from the wide area blood vessel image storage unit 11 on the display unit 3. (Step 51)
[0023]
The operator operates the input device 2 and sets a plurality of vascular nodes in the wide area image displayed on the display 2 in order to select a desired blood vessel. (Step 52)
[0024]
The control unit 1 displays the blood vessels between the blood vessel nodes set in the previous step on the display 3 as a narrow-range blood vessel image. (Step 53)
[0025]
The control unit 1 causes the cross-sectional area calculation unit 14 to calculate the cross-sectional area of a narrow-area blood vessel image (or a wide-area blood vessel image that is large enough for diagnosis). (Step 54)
[0026]
The operator checks whether other organs can be separated into blood vessels from the narrow-area blood vessel image (or a wide-area blood vessel image that is large enough for diagnosis) displayed on the display device 3. If the separation is not possible, the boundary between the blood vessel as the target organ and the other organ is designated, and only the blood vessel is extracted. (Step 55)
[0027]
The operator sets a threshold value for the cross-sectional area, and sets an image enhancement range of a narrow-area blood vessel image (or a wide-area blood vessel image that is large enough for diagnosis). Specifically, the range of the cross-sectional area of the two display cursors displayed on the display 3 is narrowed as shown in FIG. 6 from the relationship between the maximum value and the minimum value of the cross-sectional area as shown in FIG. (Step 56)
[0028]
The control unit 1 causes the image enhancement unit 15 to perform a coloring process on the narrow-area blood vessel image (or the wide-area blood vessel image having a size sufficient for diagnosis) for which the threshold is set. (Step 57)
[0029]
In the display example, as shown in FIG. 6, an X-ray CT image 60 including a longitudinal section of the blood vessel along the running direction of the blood vessel is displayed on the left side of the drawing, and a blood vessel cross section at each point in the running direction of the blood vessel is displayed on the right side of the drawing ( The graph 61 of the sectional area value of the plane perpendicular to the longitudinal section) is displayed. Here, the minimum value of the cross-sectional area is represented by red, the maximum value is represented by blue, and values between them are represented by color gradations from red to blue. Further, a color scale 62 for measuring the scale of the color gradation is displayed below the drawing. Dashed lines 63 and 65 are display cursors that can be arbitrarily moved to the position of the value of the cross-sectional area to be measured by the input device 2. The numerical value display area 64 and the numerical value display area 66 represent the numerical values “251” and “1” indicated by the broken lines 63 and 65.
[0030]
As described above, in the present embodiment, the position of the target organ of the blood vessel image and the boundary between the target organ and the other target organ are set on the blood vessel image displayed on the display unit 3 by the input device 2, and the input device 2 sets the position. Associating the display position with the cross-sectional area, setting a threshold for the value of the cross-sectional area, performing a coloring process on the blood vessel image according to the set cross-sectional area of the threshold, and displaying the blood vessel image that has been subjected to the coloring process By displaying the image on the vessel 3, a medical image display capable of identifying and displaying a lesion such as a vascular stenosis in more detail can be provided. That is, a small change in the cross-sectional area, such as a color distribution on the left side of the drawing, can be displayed as a color difference on the blood vessel image.
[0031]
<Third embodiment>
FIG. 7 is a flowchart for explaining the operation of the third embodiment of the present invention, and FIG. 8 is a diagram showing a display example of step 75 in FIG.
[0032]
The operator operates the input device 2 to cause the control unit 1 to display the wide area image read from the wide area blood vessel image storage unit 11 or the narrow area image read from the narrow area blood vessel image storage unit 13 on the display unit 3. (Step 71)
[0033]
The control unit 1 causes the cross-sectional area calculation unit 14 to calculate the cross-sectional area of a narrow-area blood vessel image (or a wide-area blood vessel image that is large enough for diagnosis). (Step 72)
[0034]
The operator checks whether other organs can be separated into blood vessels from the narrow-area blood vessel image (or a wide-area blood vessel image that is large enough for diagnosis) displayed on the display device 3. If the separation is not possible, the boundary between the blood vessel as the target organ and the other organ is designated, and only the blood vessel is extracted. (Step 73)
[0035]
The operator sets a threshold value for the cross-sectional area, and sets an image enhancement range of a narrow-area blood vessel image (or a wide-area blood vessel image that is large enough for diagnosis). Specifically, the range of the cross-sectional area is narrowed by two display cursors displayed on the display 3 as shown in FIG. (Step 74)
[0036]
The control unit 1 causes the image enhancement unit 15 to perform contour processing on the narrow-area blood vessel image (or a wide-area blood vessel image that is large enough for diagnosis). (Step 75)
[0037]
In the display example, as shown in FIG. 8, an X-ray CT image 80 including a longitudinal section of the blood vessel along the running direction of the blood vessel is displayed on the left side of the drawing, and a cross-sectional view of the blood vessel at each point in the running direction of the blood vessel is displayed on the right side of the drawing ( The graph 81 of the sectional area value of the plane perpendicular to the longitudinal section) is displayed. A broken line 82 is a display cursor that can be arbitrarily moved to the position of the value of the cross-sectional area to be measured by the input device 2. The numerical value display area 84 indicates the numerical value “51” indicated by the broken line 82. Reference numeral 85 denotes a portion whose outline is emphasized. When the broken line 82 is moved on the screen, the numerical value of the numerical value display area 84 and the range of the outline emphasized portion 85 are changed in conjunction therewith.
[0038]
As described above, in the present embodiment, the position of the target organ of the blood vessel image and the boundary between the target organ and the other target organs are set on the image displayed on the display 3 by the input device 2, and the set display is performed. By associating a position with a cross-sectional area, performing contour processing on the blood vessel image in accordance with the correlated cross-sectional area, and displaying the blood vessel image on which the contour processing has been performed on the display device 3, the vascular stenosis Intuitively grasp the degree of progress and treatment range.
[0039]
Further, by moving the broken line 82, a contour line can be drawn over the entire area of the displayed blood vessel 80, so that the organ of interest can be easily distinguished from other organs.
[0040]
In each of the above embodiments, a blood vessel has been described as an example of a target organ, but the technique of the present invention can be applied to the intestine and other tubular organs.
[0041]
Although the medical image is described using an X-ray CT image, any image that can obtain a tomographic image of any subject, such as an MRI image or an ultrasonic image, may be used.
[0042]
In Steps 33, 53, and 71, a narrow-area blood vessel image is displayed. However, if the size of the wide-area blood vessel image is large enough to be diagnosed, the narrow-area blood vessel image is displayed. Can be omitted.
[0043]
In addition, the image enhancement processing is not limited to coloring and contour enhancement, and any processing may be used as long as the lesion is identified and displayed more clearly than other parts.
[0044]
In addition, in the informed consent in which the doctor explains the treatment plan to the patient, the image of the lesion is emphasized with a color different from that of other organs, so that even a patient without knowledge of medical images can easily understand the diseased part. can do.
[0045]
Further, the feature quantity representing the shape of the part has been described by taking the cross-sectional area as an example, but any quantity other than the cross-sectional area can be applied as long as the quantity indicates the feature of the shape of the part such as curvature and average radius.
[0046]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, there exists an effect which provides the medical image display which can easily identify and display the lesion part, such as a blood vessel stenosis.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an example of a medical image display device according to the present invention.
FIG. 2 is a block diagram showing an example of a control unit in FIG. 1;
FIG. 3 is a flowchart illustrating the operation of the first embodiment of the present invention.
FIG. 4 is a view showing a display example of step 36 in FIG. 3;
FIG. 5 is a flowchart for explaining the operation of the second embodiment of the present invention.
FIG. 6 is a view showing a display example of step 57 in FIG. 5;
FIG. 7 is a flowchart illustrating the operation of the third embodiment of the present invention.
FIG. 8 is a view showing a display example of step 75 in FIG. 7;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Control device, 2 ... Input device, 3 ... Output device, 4 ... Storage device

Claims (4)

表示された医用画像の注目臓器に関して広域に撮像した広域画像から病変部を含む部位を抽出し、該抽出された部位に関する狭域画像を表示器に表示し、該表示された狭域画像を用いてその部位の形状を表す特徴量を算出し、その形状を表す特徴量を前記表示器に前記狭域画像と共に表示する医用画像表示方法において、前記狭域画像の注目臓器とその注目臓器の他との境界の位置を前記表示器に表示された狭域画像上に設定するステップと、該設定された表示位置と前記形状を表す特徴量を対応づけるステップと、該対応づけられた形状を表す特徴量に応じて前記狭域画像に画像強調処理を施すステップと、該画像強調処理が施された狭域画像を前記表示器に表示するステップとを備えたことを特徴とする医用画像表示方法。Extracting a region including a lesion from a wide-area image captured in a wide area with respect to the target organ of the displayed medical image, displaying a narrow-region image on the extracted region on a display, and using the displayed narrow-region image Calculating a feature amount representing the shape of the part, and displaying the feature amount representing the shape together with the narrow-area image on the display device. Setting the position of the boundary with the narrow area image displayed on the display, associating the set display position with the feature amount representing the shape, and representing the associated shape. A medical image display method comprising: performing image enhancement processing on the narrow area image in accordance with a feature amount; and displaying the narrow area image on which the image enhancement processing has been performed on the display device. . 前記形状を表す特徴量の大きさに応じた閾値を設定するステップを備え、前記画像強調処理を施すステップは、前記設定された閾値に応じて前記狭域画像に画像強調処理を施すことを特徴とする請求項1に記載の医用画像表示方法。Setting a threshold value according to the magnitude of the feature amount representing the shape, wherein the step of performing the image enhancement processing includes performing the image enhancement processing on the narrow-area image according to the set threshold value. The medical image display method according to claim 1, wherein 表示された医用画像の注目臓器に関して広域に撮像した広域画像から病変部を含む部位を抽出し、該抽出された部位に関する狭域画像を表示器に表示し、該表示された狭域画像を用いてその部位の形状を表す特徴量を算出し、その形状を表す特徴量を前記表示器に前記狭域画像と共に表示する医用画像表示装置において、前記狭域画像の注目臓器とその注目臓器の他との境界の位置を前記表示器に表示された狭域画像上に設定する手段と、該設定された表示位置と前記形状を表す特徴量を対応づける手段と、該対応づけられた形状を表す特徴量に応じて前記狭域画像に画像強調処理を施す手段と、該画像強調処理が施された狭域画像を前記表示器に表示する手段とを備えたことを特徴とする医用画像表示装置。Extracting a region including a lesion from a wide-area image captured in a wide area with respect to the target organ of the displayed medical image, displaying a narrow-region image on the extracted region on a display, and using the displayed narrow-region image A medical image display device that calculates a feature value representing the shape of the part and displays the feature value representing the shape together with the narrow-area image on the display device. Means for setting the position of the boundary with the narrow area image displayed on the display, means for associating the set display position with a feature quantity representing the shape, and representing the associated shape. A medical image display device comprising: means for performing image enhancement processing on the narrow area image in accordance with the feature amount; and means for displaying the narrow area image on which the image enhancement processing has been performed on the display device. . 前記形状を表す特徴量の大きさに応じた閾値を設定する手段を備え、前記画像強調処理を施す手段は、前記設定された閾値に応じて前記狭域画像に画像強調処理を施すことを特徴とする請求項3に記載の医用画像表示装置。Means for setting a threshold value according to the size of the feature amount representing the shape, wherein the means for performing the image enhancement processing performs the image enhancement processing on the narrow-area image according to the set threshold value. The medical image display device according to claim 3, wherein
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