JPH1011604A - Shading method by volume rendering method and device therefor - Google Patents
Shading method by volume rendering method and device thereforInfo
- Publication number
- JPH1011604A JPH1011604A JP8158357A JP15835796A JPH1011604A JP H1011604 A JPH1011604 A JP H1011604A JP 8158357 A JP8158357 A JP 8158357A JP 15835796 A JP15835796 A JP 15835796A JP H1011604 A JPH1011604 A JP H1011604A
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- Prior art keywords
- shading
- pixel value
- volume rendering
- gradient
- picture
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Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000009877 rendering Methods 0.000 title claims abstract description 29
- 210000001835 viscera Anatomy 0.000 abstract 2
- 210000004556 brain Anatomy 0.000 description 8
- 210000000988 bone and bone Anatomy 0.000 description 6
- 210000000056 organ Anatomy 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 210000001519 tissue Anatomy 0.000 description 3
- 230000008520 organization Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 210000003491 skin Anatomy 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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- Image Generation (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ボリュームデータ
を含む複数の断層像から得る三次元画像の陰影づけに係
り、特にボリュームレンダリング法による陰影づけ方法
及び装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to shading of a three-dimensional image obtained from a plurality of tomographic images including volume data, and more particularly to a shading method and apparatus by a volume rendering method.
【０００２】[0002]
【従来の技術】ボリュームレンダリング法による陰影づ
けを行うと、淡い表示や半透明表示ができることが知ら
れている。それは、光が物体内部まで減衰・反射しなが
ら通過し、光量が一定の割合に減衰するまでに通過した
ところを全て画像化するという方法をとっているためで
ある。2. Description of the Related Art It is known that a shaded display or a translucent display can be obtained by performing shading by a volume rendering method. This is because a method is used in which light passes through the inside of the object while being attenuated / reflected and the light amount passes before the light amount attenuates at a constant rate.
【０００３】[0003]
【発明が解決しようとする課題】ボリュームレンダリン
グ法による半透明表示の場合、いくつも見える臓器のう
ち、特定の臓器を明瞭（コントラストをつけて）にし
て、ほかの臓器は参考程度にうっすらと（コントラスト
をあまりつけず）表示したいときがある。例えば人間の
頭に関して、頭は皮膚と脳と骨とで構成されるが皮膚と
脳をうっすらと描画して、骨を明瞭に描画する如き例が
ある。In the case of translucent display by the volume rendering method, a specific organ is made clear (with contrast) among a number of visible organs, and the other organs are slightly faint (for reference). There are times when you want to display without adding much contrast. For example, regarding a human head, there is an example in which the head is composed of skin, brain, and bone, but the skin and brain are slightly drawn to draw the bones clearly.
【０００４】かかる従来のボリュームレンダリング法の
一例（周藤安造著．「医学における三次元画像処理」の
１０４ページ〜１１０ページ。１９９５年３月１０日．
株式会社コロナ社発行）を以下に示す。ボリュームレン
ダリングによる三次元画像の画素値を求めるには、先ず
傾斜を考慮した画素値を下記の式に従って求める。[0004] An example of such a conventional volume rendering method (by Yasuzo Shuto, "3D image processing in medicine", pp. 104-110, March 10, 1995.
(Corona Co., Ltd.) is shown below. In order to obtain a pixel value of a three-dimensional image by volume rendering, first, a pixel value in consideration of an inclination is obtained according to the following equation.
【数１】 ここで、Ｇｒａｄは傾斜から得られる画素値を示すため
のシンボル、ｆ（ｉ、ｊ、ｋ）は、座標（ｉ、ｊ、ｋ）にお
ける画素値、Ｇｒａｄ ｆ（ｉ、ｊ、ｋ）は傾斜から求ま
る座標（ｉ、ｊ、ｋ）での画素値を示す。更に右辺での
（ｆ(ｉ＋１、ｊ、ｋ)−ｆ(ｉ−１、ｊ、ｋ)）／２とは、座
標ｉの前後の座標ｉ＋１、ｉ−１での画素値の差分を求
め、これを２で除算（即ち１つの座標ｉでの傾斜に割り
当てるための処理）するとの意味をなす。他の座標ｊ、
ｋでも同様である。(Equation 1) Here, Grad is a symbol for indicating a pixel value obtained from the slope, f (i, j, k) is a pixel value at coordinates (i, j, k), and Grad f (i, j, k) is a slope. Indicates the pixel value at the coordinates (i, j, k) obtained from. Further, (f (i + 1, j, k) -f (i-1, j, k)) / 2 on the right side is obtained by calculating a difference between pixel values at coordinates i + 1 and i-1 before and after the coordinate i. It is meaningful to divide this by two (that is, a process for assigning to a slope at one coordinate i). Other coordinates j,
The same applies to k.
【０００５】簡単のため、数１に関して、座標（ｉ、ｊ、
ｋ）をｘiとおく。そして勾配を考慮した任意の位置ｘi
でのボクセルの不透明度α（ｘi）を、次式で表す。こ
こで、αa、αb、αcは典型的な組織（例えば、ａ、
ｂ、ｃの３つの組織例）毎に固有な不透明度を示す定数
であり、テーブルに登録しておく。ｆa、ｆb、ｆcは複
数の異なる生体組織（ａ、ｂ、ｃの３つの組織例）の境
界におけるスカラー値（一般にボクセル値）であり、例
えばｆa≦ｆb≦ｆcである。従って、ｆaとαa、ｆbとα
b、ｆcとαcとはそれぞれ複数の異なる生体組織ａ、
ｂ、ｃの境界におけるスカラ値とその値に対する不透明
度を示すことになる。ｆ（ｘi）と、ｆa、ｆb、ｆcとの
大小の対比で不透明度α（ｘi）は以下の４つの形態と
なる。For simplicity, the coordinates (i, j,
k) place and the x i. And any position x i considering the gradient
The opacity α (x i ) of the voxel at is represented by the following equation. Here, α a , α b , α c are typical tissues (for example, a,
It is a constant indicating the unique opacity for each of the three organization examples b and c) and is registered in a table. f a, f b, f c is the scalar value at the boundary of a plurality of different biological tissues (a, b, 3 an organization example c) (generally voxel values), for example at f a ≦ f b ≦ f c . Therefore, f a and α a , f b and α
b , f c and α c are each a plurality of different living tissues a,
It indicates the scalar value at the boundary between b and c and the opacity for that value. and f (x i), f a , f b, opacity comparison magnitude of f c α (x i) is the following four forms.
【０００６】[0006]
【数２】 三次元画像のためのレンダリング処理は次のようにな
る。投影線毎にその投影線に沿って奥行き方向に並んだ
ボクセルについて、前方の光と自らが発する光、あるい
は光源に照らされて反射する光（前記不透明度α
（ｘi）よって定まる）とを合成して、次々とボクセル
に渡していき、最後のボクセルから出る光がレンダリン
グ画像のビクセル値（画素値）になる。なお、反射係数
はあらかじめテーブルで与えておく。こうしたボリュー
ムレンダリング法では、前述の如き骨を明瞭に、皮膚と
脳とをうっすらと描く如き描き分けは不可能であった。(Equation 2) The rendering process for a three-dimensional image is as follows. For voxels arranged in the depth direction along the projection line for each projection line, light in front of the voxel and light emitted by itself or light reflected by a light source (the opacity α
(X i) thus determined) and by synthesizing, will pass one after another voxel, the light exiting the last voxel is Bikuseru value of the rendered image (pixel values). The reflection coefficient is given in advance in a table. With such a volume rendering method, it was impossible to clearly draw the bone as described above and draw the skin and the brain slightly.
【０００７】本発明の目的は、こうした課題の解消をは
かり、必要とする部位の画素値を任意に設定可能な陰影
づけ方法及び装置を提供するものである。An object of the present invention is to solve such a problem and to provide a shading method and apparatus capable of arbitrarily setting a pixel value of a required portion.
【０００８】[0008]
【課題を解決するための手段】本発明は、ボリュームデ
ータを含む複数の断層像から三次元画像を構成し、その
際に前記断層像の画素値に対応する情報を含ませて陰影
を施すようにする方法において、ボリュームレンダリン
グ法の要素である陰影づけの勾配を画像の性質又は陰影
化の仕方に対応させて変更させるものとしたボリューム
レンダリング法による陰影づけ方法を開示する。According to the present invention, a three-dimensional image is constructed from a plurality of tomographic images including volume data, and at this time, information corresponding to the pixel values of the tomographic image is included to perform shading. A method of shading by a volume rendering method is disclosed in which the gradient of shading, which is an element of the volume rendering method, is changed in accordance with the properties of the image or the shading method.
【０００９】更に本発明は、ボリュームデータを含む複
数の断層像から三次元画像を構成し、その際に前記断層
像の画素値に対応する情報を含ませて陰影を施すように
する陰影づけ装置において、ボリュームレンダリング法
の要素である陰影づけの勾配を画素点の位置と投影面と
の距離に関係づけた値で冪乗する手段と、この冪乗で得
た勾配に従って各ボクセルの不透明度を算出する手段
と、かくして得た不透明度に従って、各投影線上でのボ
リュームレンダリング画素値を算出する手段と、該算出
したボリュームレンダリング画素値を投影面上の画素値
として表示する手段と、より成るボリュームレンダリン
グ法による陰影づけ装置を開示する。Further, the present invention provides a shading device for forming a three-dimensional image from a plurality of tomographic images including volume data, and performing shading by including information corresponding to the pixel value of the tomographic image. In, means for raising the gradient of shading, which is an element of the volume rendering method, with a value related to the distance between the position of the pixel point and the projection surface, and the opacity of each voxel according to the gradient obtained by this power. Means for calculating, according to the opacity thus obtained, means for calculating a volume rendering pixel value on each projection line, and means for displaying the calculated volume rendering pixel value as a pixel value on a projection plane. A shading device using a rendering method is disclosed.
【００１０】更に本発明は、ボリュームデータを含む複
数の断層像から三次元画像を構成し、その際に前記断層
像の画素値に対応する情報を含ませて陰影を施すように
する陰影づけ装置において、ボリュームレンダリング法
の要素である陰影づけの勾配を前記画素値及び画素値勾
配に関係づけた値で冪乗する手段と、この冪乗で得た勾
配に従って各ボクセルの不透明度を算出する手段と、か
くして得た不透明度に従って、各投影線上でのボリュー
ムレンダリング画素値を算出する手段と、該算出したボ
リュームレンダリング画素値を投影面上の画素値として
表示する手段と、より成るボリュームレンダリング法に
よる陰影づけ装置を開示する。Further, the present invention provides a shading device for forming a three-dimensional image from a plurality of tomographic images including volume data, and performing shading by including information corresponding to the pixel value of the tomographic image. Means for raising the gradient of shading, which is an element of the volume rendering method, to the pixel value and a value related to the pixel value gradient, and means for calculating the opacity of each voxel according to the gradient obtained by the power. Means for calculating a volume rendering pixel value on each projection line in accordance with the opacity thus obtained, and means for displaying the calculated volume rendering pixel value as a pixel value on a projection plane. A shading device is disclosed.
【００１１】[0011]
【発明の実施の形態】本実施の形態では、前記（数１）
はそのまま使用し、前記（数２）を下記の如き数式とす
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present embodiment, the above (Equation 1)
Is used as it is, and the above (Equation 2) is represented by the following mathematical formula.
【数３】 即ち、傾斜画素値Ｇｒａｄ ｆ（ｘi）（絶対値）をδ
乗化するようにした。ここで、値δとは、画像の性質
（又は陰影化の仕方）に従って変化させるものとする。(Equation 3) That is, the gradient pixel value Grad f (x i ) (absolute value) is represented by δ
To be multiplied. Here, the value δ is changed in accordance with the properties of the image (or the manner of shading).
【００１２】図２には、画素点と投影面との距離ｒによ
って値δを特別の形で変化させた例である。形態Ａは、
ｒ＜ｒ1では、δ＝δ01、ｒ1≦ｒ≦ｒ3では、δを三角
形の形態で変更、ｒ3＜ｒでは、δ＝δ01、とした例で
ある。形態Ｂは、ｒ＜ｒ2では、δ＝δ02、ｒ2≦ｒ≦ｒ
4では、δ＝３、ｒ4＜ｒでは、δ＝δ02、とした例であ
る。形態Ａにするか形態Ｂにするかは、描きたい陰影化
による。また、形態Ａ、Ｂ以外にも、距離ｒに応じて種
々の形態を実現できる。形態ＡとＢとを比較すれば、 ・形態Ａは形態Ｂよりも距離ｒの手前側でδを大きく設
定している。 ・形態Ａは三角形で且つピークが大きく、α01＜α02で
あるのに対し、形態Ｂは矩形でピークも小さく、α02＞
α01である。 ・従って、形態Ａを選べば投影面から近いところ（ｒ1
〜ｒ2）で且つコントラストも三角形に従った集中形の
ものとなり、形態Ｂを選べば投影面から遠いところ（ｒ
2〜ｒ4）で且つコントラストも矩形に従った多少の幅を
持つものとなる。また形態Ａに比べて形態Ｂはδ02＞δ
01であることから、投影面から近い位置及び投影面から
遠い位置では、明るく陰影化される。こうした距離ｒと
値δとの関係はメモリテーブルに格納しておき、必要に
応じて読み出して使用する。尚、図２での投影面とは、
三次元画像の投影先の面のことであり、投影法には平行
投影法や中心投影法等がある。投影面に投影する画像に
ついて陰影化をはかるが、かかる陰影化に際して、図２
を利用することにしたのである。FIG. 2 shows an example in which the value δ is changed in a special manner depending on the distance r between the pixel point and the projection plane. Form A is
In r <r 1, at δ = δ 01, r 1 ≦ r ≦ r 3, change the [delta] form of a triangle, the r 3 <r, δ = δ 01, an example in which a. In the case B, when r <r 2 , δ = δ 02 , r 2 ≦ r ≦ r
4 is an example in which δ = 3 and r 4 <r, δ = δ 02 . Whether to use the form A or the form B depends on the shading to be drawn. In addition to the modes A and B, various modes can be realized according to the distance r. Comparing Forms A and B: Form A has a larger δ on the near side of distance r than Form B. Form A is triangular and has a large peak, α 01 <α 02 , whereas form B is rectangular and has a small peak, α 02 >
α 01 . Therefore, if the form A is selected, the position close to the projection plane (r 1
Ｒr 2 ) and the contrast is a concentrated type according to a triangle, and if the form B is selected, the position far from the projection plane (r
2 to r 4 ) and the contrast also has a certain width according to the rectangle. Also, compared to form A, form B has δ 02 > δ
Since it is 01 , it is brightly shaded at a position near the projection plane and a position far from the projection plane. The relationship between the distance r and the value δ is stored in a memory table and read out and used as needed. In addition, the projection surface in FIG.
This refers to the plane to which the three-dimensional image is projected. The projection method includes a parallel projection method, a central projection method, and the like. The image to be projected on the projection plane is shaded.
We decided to use.
【００１３】図３は、ＣＴ値（画素値）及びＣＴ値の勾
配に従って値δを変化させる例である。ＣＴ値をｘ軸、
ＣＴ値の勾配をｙ軸とし、δをｚ軸とした。値δは、
（ｘ0、ｙ0）でピーク値を呈し、その近傍でヒストグラ
ム的な形状Ｃをなすように設定してある。ピーク値及び
ヒストグラムの形態及びその大きさは求めたい陰影化に
よって定める。こうした図３の形態Ｃを採用すること
で、例えば皮膚のＣＴ値と脳のＣＴ値は互いに近いため
に区別しにくいが、境界での勾配は大きく異なる（皮膚
は空気と接するので勾配は大きい）ので、皮膚と脳とを
区別して表示できる利点を持つ。FIG. 3 shows an example in which the value δ is changed according to the CT value (pixel value) and the gradient of the CT value. CT value on x-axis,
The gradient of the CT value was set on the y-axis, and δ was set on the z-axis. The value δ is
A peak value is set at (x 0 , y 0 ), and a histogram-like shape C is set near the peak value. The form and size of the peak value and the histogram are determined by shading to be obtained. By adopting the form C in FIG. 3, for example, the CT value of the skin and the CT value of the brain are difficult to distinguish because they are close to each other, but the gradient at the boundary is significantly different (the gradient is large because the skin is in contact with air). Therefore, there is an advantage that the skin and the brain can be distinguished and displayed.
【００１４】図３のデータもメモリテーブルとして格納
することで、読み出し自在に使用できる。テーブルに格
納するに際しては、例えば、ｘ＝ｘ0、ｙ＝ｙ0では、 δ＝Ｃ2 ｘ1≦ｘ≦ｘ2、 ｙ1≦ｙ≦ｙ2（但し、ｘ1＜ｘ0＜
ｘ2、ｙ1＜ｙ0＜ｙ2とし、ｘ、ｙはｘ≠ｘ0、ｙ≠ｙ0と
する）では、 δ＝Ｃ0＋Ｃ1／（ｘ2・ｙ2） ｘ＜ｘ1又はｘ＞ｘ2、ｙ＜ｙ1又はｙ＞ｙ2では、 δ＝Ｃ0 の如くする。ここで、Ｃ0、Ｃ1、Ｃ2は定数である。Ｃ0
＜Ｃ2である。ヒストグラムとしたが、三角形や矩形等
その形態は種々設定可能である。By storing the data of FIG. 3 as a memory table, it can be used in a freely readable manner. When storing in a table, for example, when x = x 0 and y = y 0 , δ = C 2 x 1 ≦ x ≦ x 2 , y 1 ≦ y ≦ y 2 (where x 1 <x 0 <
and x 2, y 1 <y 0 <y 2, x, y is in the x ≠ x 0, y ≠ y 0), δ = C 0 + C 1 / (x 2 · y 2) x <x 1 or When x> x 2 and y <y 1 or y> y 2 , δ = C 0 . Here, C 0 , C 1 , and C 2 are constants. C 0
<It is a C 2. Although the histogram is used, various forms such as a triangle and a rectangle can be set.
【００１５】図１には、図２又は図３を利用して得た画
像の表示例を示す。表示画面上に、脳１と、皮膚３と骨
２とを重ねて表示した。特に、骨２を強く表示し、脳１
と皮膚３とを柔らかく表示させる陰影化をはかってい
る。FIG. 1 shows a display example of an image obtained using FIG. 2 or FIG. On the display screen, the brain 1, the skin 3, and the bone 2 are displayed in an overlapping manner. In particular, the bone 2 is strongly displayed and the brain 1
And the skin 3 are displayed softly.
【００１６】図４は、本実施の形態の装置例を示す。共
通バス１８に、ＣＰＵ１０、主メモリ１１、磁気ディス
ク１２、表示メモリ１３、ＣＲＴ１４、コントローラ１
５、マウス１６、キーボード１７を接続した構成であ
る。磁気ディスク１２にボリュームレンダリング対象の
画像（ＣＴ画像やＭＲ画像）が格納されており、これを
キーボード１７やマウス１６の指示により主メモリ１１
に送り、ＣＰＵ１０によってボリュームレンダリング処
理を行う。この処理によって得られた陰影化された擬似
三次元画像は表示メモリ１３に一時記憶されて、ＣＲＴ
１４に表示される。その表示例が図１の如きものであ
る。ここで、前記の参考文献に従うと、三次元画像のた
めのレンダリング処理は次のようになる。投影線に沿っ
て並んだボクセルについて、前方の光と自らが発する
光、あるいは光源に照らされて反射する光（前記不透明
度によって定まる）とを合成して、次々とボクセルに渡
していき、最後のボクセルから出る光がレンダリング画
像のビクセル値（画素値）になる。尚、反射係数はあら
かじめテーブルで与えておく。尚、メモリテーブルに図
２や図３の形態を格納させるとしたが、計算によって求
めてもよく、又はキーボード１７からの入力によっても
よい。FIG. 4 shows an example of the apparatus according to this embodiment. CPU 10, main memory 11, magnetic disk 12, display memory 13, CRT 14, controller 1
5, a mouse 16 and a keyboard 17 are connected. An image (CT image or MR image) to be subjected to volume rendering is stored in the magnetic disk 12, and is stored in the main memory 11 by an instruction from the keyboard 17 or the mouse 16.
And volume rendering processing is performed by the CPU 10. The shaded pseudo three-dimensional image obtained by this processing is temporarily stored in the display memory 13, and is displayed on the CRT.
14 is displayed. An example of the display is as shown in FIG. Here, according to the above reference, the rendering process for a three-dimensional image is as follows. For the voxels arranged along the projection line, the light in front and the light emitted by itself or the light reflected by the light source (determined by the opacity) are combined and passed to the voxels one after another. Is the voxel value (pixel value) of the rendered image. The reflection coefficient is given in a table in advance. Although the form of FIG. 2 or FIG. 3 is stored in the memory table, it may be obtained by calculation or input from the keyboard 17.
【００１７】[0017]
【発明の効果】本発明によれば、半透明表示の場合、い
くつも見える臓器のうち、特定の臓器を明瞭（コントラ
ストをつけて）にして、他の臓器は参考程度にうっすら
と（コントラストをあまりつけず）表示できるようにな
る。According to the present invention, in the case of translucent display, a specific organ is made clear (with contrast) among many visible organs, and the other organs are slightly (for example, contrast is reduced). (Not much) can be displayed.
【図１】本発明の陰影表示例図である。FIG. 1 is a diagram showing an example of a shade display according to the present invention.
【図２】本発明の陰影処理のためのδの設定例図であ
る。FIG. 2 is a diagram illustrating an example of setting δ for shading processing according to the present invention.
【図３】本発明の陰影処理のためのδの他の設定例図で
ある。FIG. 3 is a diagram illustrating another example of setting δ for shading processing according to the present invention.
【図４】本発明の陰影づけ装置の構成例図である。FIG. 4 is a structural example diagram of a shading device of the present invention.
１ 脳の画像 ２ 骨の画像 ３ 皮膚の画像 1 Brain image 2 Bone image 3 Skin image
Claims (3)
ら三次元画像を構成し、その際に前記断層像の画素値に
対応する情報を含ませて陰影を施すようにする方法にお
いて、ボリュームレンダリング法の要素である陰影づけ
の勾配を画像の性質又は陰影化の仕方に対応させて変更
させるものとしたボリュームレンダリング法による陰影
づけ方法。1. A method of constructing a three-dimensional image from a plurality of tomographic images including volume data and applying a shadow by including information corresponding to pixel values of the tomographic image at that time. A shading method using a volume rendering method, wherein the gradient of shading, which is an element of (1), is changed in accordance with the properties of the image or the manner of shading.
ら三次元画像を構成し、その際に前記断層像の画素値に
対応する情報を含ませて陰影を施すようにする陰影づけ
装置において、ボリュームレンダリング法の要素である
陰影づけの勾配を画素点の位置と投影面との距離に関係
づけた値で冪乗する手段と、この冪乗で得た勾配に従っ
て各ボクセルの不透明度を算出する手段と、かくして得
た不透明度に従って、各投影線上でのボリュームレンダ
リング画素値を算出する手段と、該算出したボリューム
レンダリング画素値を投影面上の画素値として表示する
手段と、より成るボリュームレンダリング法による陰影
づけ装置。2. A shading device for forming a three-dimensional image from a plurality of tomographic images including volume data, and performing shading by including information corresponding to pixel values of the tomographic image. Means for raising the gradient of shading, which is an element of the rendering method, to a value related to the distance between the position of the pixel point and the projection plane, and means for calculating the opacity of each voxel according to the gradient obtained by the power Means for calculating a volume rendering pixel value on each projection line in accordance with the opacity thus obtained, and means for displaying the calculated volume rendering pixel value as a pixel value on a projection plane. Shading device.
ら三次元画像を構成し、その際に前記断層像の画素値に
対応する情報を含ませて陰影を施すようにする陰影づけ
装置において、ボリュームレンダリング法の要素である
陰影づけの勾配を前記画素値及び画素値勾配に関係づけ
た値で冪乗する手段と、この冪乗で得た勾配に従って各
ボクセルの不透明度を算出する手段と、かくして得た不
透明度に従って、各投影線上でのボリュームレンダリン
グ画素値を算出する手段と、該算出したボリュームレン
ダリング画素値を投影面上の画素値として表示する手段
と、より成るボリュームレンダリング法による陰影づけ
装置。3. A shading device for constructing a three-dimensional image from a plurality of tomographic images including volume data and performing shading by including information corresponding to pixel values of the tomographic image at that time. Means for raising the shading gradient, which is an element of the rendering method, with the pixel value and a value related to the pixel value gradient, and means for calculating the opacity of each voxel according to the gradient obtained by the power; Means for calculating a volume rendering pixel value on each projection line according to the obtained opacity, and means for displaying the calculated volume rendering pixel value as a pixel value on a projection plane; .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15835796A JP3762482B2 (en) | 1996-06-19 | 1996-06-19 | Shading method and apparatus by volume rendering method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15835796A JP3762482B2 (en) | 1996-06-19 | 1996-06-19 | Shading method and apparatus by volume rendering method |
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| Publication Number | Publication Date |
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| JP3762482B2 JP3762482B2 (en) | 2006-04-05 |
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ID=15669909
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15835796A Expired - Fee Related JP3762482B2 (en) | 1996-06-19 | 1996-06-19 | Shading method and apparatus by volume rendering method |
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| Country | Link |
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| JP (1) | JP3762482B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004215846A (en) * | 2003-01-14 | 2004-08-05 | Ziosoft Inc | Method and device for volume rendering image processing and program therefor |
| JP2006043431A (en) * | 2004-08-06 | 2006-02-16 | Toshiba Corp | Method to reduce helical windmill artifact with recovery noise for helical multi-slice CT |
| JP2011078514A (en) * | 2009-10-06 | 2011-04-21 | Toshiba Corp | Ultrasonograph and ultrasonic image generation program |
| WO2012109643A3 (en) * | 2011-02-11 | 2012-10-18 | Emory University | Systems, methods and computer readable storage mediums storing instructions for classifying breast ct images |
| US8411925B2 (en) | 2009-02-04 | 2013-04-02 | Kabushiki Kaisha Toshiba | X-ray diagnosis apparatus and image processing apparatus |
| JP2019209149A (en) * | 2018-06-07 | 2019-12-12 | キヤノンメディカルシステムズ株式会社 | Medical image processing apparatus and rendering method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011062108A1 (en) * | 2009-11-19 | 2011-05-26 | 株式会社 日立メディコ | Image processing apparatus and image processing method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62219075A (en) * | 1986-03-20 | 1987-09-26 | Hitachi Medical Corp | Translucent display method for three-dimensional picture |
| JPH03251971A (en) * | 1990-03-01 | 1991-11-11 | Toshiba Corp | Picture display device |
| JPH0620065A (en) * | 1992-07-06 | 1994-01-28 | Hitachi Medical Corp | Picture diagnosing device |
| JPH0628490A (en) * | 1993-05-28 | 1994-02-04 | Hitachi Medical Corp | Method and device for displaying three-dimensional image |
| JPH0728976A (en) * | 1993-07-07 | 1995-01-31 | Toshiba Corp | Image display device |
| JPH07114650A (en) * | 1993-10-15 | 1995-05-02 | Hitachi Medical Corp | Three-dimensional image display method and device |
-
1996
- 1996-06-19 JP JP15835796A patent/JP3762482B2/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62219075A (en) * | 1986-03-20 | 1987-09-26 | Hitachi Medical Corp | Translucent display method for three-dimensional picture |
| JPH03251971A (en) * | 1990-03-01 | 1991-11-11 | Toshiba Corp | Picture display device |
| JPH0620065A (en) * | 1992-07-06 | 1994-01-28 | Hitachi Medical Corp | Picture diagnosing device |
| JPH0628490A (en) * | 1993-05-28 | 1994-02-04 | Hitachi Medical Corp | Method and device for displaying three-dimensional image |
| JPH0728976A (en) * | 1993-07-07 | 1995-01-31 | Toshiba Corp | Image display device |
| JPH07114650A (en) * | 1993-10-15 | 1995-05-02 | Hitachi Medical Corp | Three-dimensional image display method and device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004215846A (en) * | 2003-01-14 | 2004-08-05 | Ziosoft Inc | Method and device for volume rendering image processing and program therefor |
| JP2006043431A (en) * | 2004-08-06 | 2006-02-16 | Toshiba Corp | Method to reduce helical windmill artifact with recovery noise for helical multi-slice CT |
| US8411925B2 (en) | 2009-02-04 | 2013-04-02 | Kabushiki Kaisha Toshiba | X-ray diagnosis apparatus and image processing apparatus |
| JP2011078514A (en) * | 2009-10-06 | 2011-04-21 | Toshiba Corp | Ultrasonograph and ultrasonic image generation program |
| WO2012109643A3 (en) * | 2011-02-11 | 2012-10-18 | Emory University | Systems, methods and computer readable storage mediums storing instructions for classifying breast ct images |
| JP2019209149A (en) * | 2018-06-07 | 2019-12-12 | キヤノンメディカルシステムズ株式会社 | Medical image processing apparatus and rendering method |
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|---|---|
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