JP2013165862A - Apparatus, method and program for generating body rebuilding model shape data - Google Patents
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本発明は、病気や事故等で身体の一部、特に左右一対の身体部分の一方が欠損した人の該欠損部分を再建するための身体再建モデルデータ作成装置及び方法並びにプログラムに関する。 The present invention relates to a body reconstruction model data creation apparatus, method, and program for reconstructing a missing part of a person who has lost a part of the body due to illness or an accident, in particular, one of a pair of left and right body parts.
事故や病気の治療のために身体の一部が失われた人の精神的ストレスを緩和し、予後の生活の質の向上を図るために、失われた身体部分の外観や機能を元の状態に回復する「再建」と呼ばれる治療が行われている。例えば乳癌患者の場合、腫瘍の大きさや進行の程度にもよるが、腫瘍組織を取り除くために乳房の一部若しくは全部を切除することがあり、そのような患者に対して、手術後に乳房の再建が行われている（特許文献１参照）。 The original state of the appearance and function of the lost body part to relieve mental stress and improve the quality of life of the person who lost the body part due to the treatment of an accident or disease A treatment called “reconstruction” that recovers to a certain level is being carried out. For example, in the case of breast cancer patients, depending on the size and extent of the tumor, some or all of the breast may be removed to remove the tumor tissue. (See Patent Document 1).
乳房再建の方法には、シリコン製の人工乳房を胸部に貼り付ける方法、人工材料を胸部に挿入するインプラント法、腹部等の皮膚や皮下組織を胸部に移植（移動）させる皮弁移植法等、いくつかの方法がある。いずれの方法においても、失われた乳房の形状を推定し、その形状に復元するように再建が行われる。人間の乳房は略左右対称な形状を有していることから、通常、切除しなかった乳房、つまり健常側の乳房を左右反転させた形状に基づき欠損側の乳房の形状が推定される。 Breast reconstruction methods include a silicone artificial breast affixed to the chest, an implant method in which artificial materials are inserted into the chest, a skin graft such as the abdomen and subcutaneous tissue transplanted (moved) to the chest, etc. There are several ways. In either method, reconstruction is performed so as to estimate the shape of the lost breast and restore it to that shape. Since the human breast has a substantially bilaterally symmetric shape, the shape of the missing breast is usually estimated based on a breast that has not been removed, that is, a shape obtained by horizontally inverting the healthy breast.
しかし、実際は人間の体は完全な左右対称ではなく、左右の乳房の上下や左右の位置が違ったり、幅が異なったりする。従って、健常側の乳房形状を左右反転させただけの形状では、欠損側の胸部にフィットしないことが多い。このため、例えば人工乳房を作製する場合には、人工乳房のマスター型を健常側の乳房を左右反転させた形状から作製した後、このマスター型を患者の欠損側胸部に当てながら形状を微修正するという作業を繰り返し行う。こうして完成したマスター型からネガティブ型を作製し、このネガティブ型を元に人工乳房が作製される。このように、人工乳房の作製には多数の手間や工程を必要とするため、時間や費用がかかるという問題があった。
なお、このような問題は乳房に限らず、その他の様々な身体部分を再建する場合にも生じる。
In reality, however, the human body is not completely symmetrical, and the left and right breasts have different vertical and horizontal positions and widths. Therefore, in many cases, the shape of the healthy breast is simply reversed left and right and does not fit the defect chest. For this reason, for example, when making an artificial breast, after making the master type of the artificial breast from the shape of the left and right sides of the healthy breast reversed, the shape is finely corrected while applying this master type to the patient's missing chest Repeat the process of doing. A negative mold is produced from the master mold thus completed, and an artificial breast is produced based on the negative mold. As described above, since the production of the artificial breast requires a lot of labor and processes, there is a problem that it takes time and cost.
Such a problem is not limited to the breast but also occurs when various other body parts are reconstructed.
本発明が解決しようとする課題は、一部が欠損した身体部分を再建するための再建モデルを簡便且つ安価に作製することができる身体再建モデル形状データ作成装置及び方法並びにプログラムを提供することである。 The problem to be solved by the present invention is to provide a body reconstruction model shape data creation device, method, and program capable of easily and inexpensively creating a reconstruction model for reconstructing a partially missing body part. is there.
上記課題を解決するために成された本発明は、正中線を挟んで左右対称な位置にある一対の身体部分の、一方の一部又は全部が欠損した欠損身体部分を、他方の欠損していない非欠損身体部分の形状に基づいて外観を再建するための再建モデル形状データ作成装置であって、
a)前記非欠損身体部分の表面形状の三次元形状データに基づいて、該非欠損身体部分の表面の再建基礎領域内に位置するｍ×ｎ個（ｍ、ｎはいずれも３以上の整数）の格子状に配列された点から成る表面点群の位置情報を生成する非欠損側表面点群位置情報生成手段と、
b)前記非欠損身体部分の表面点群の位置情報の中から、前記再建基礎領域の周縁に位置する複数の周縁点群の位置情報を抽出する非欠損側周縁点群位置情報抽出手段と、
c)前記非欠損身体部分の周縁点同士を線分で結び、該線分によって規定される面である基準底面を求め、該基準底面上に位置する、前記表面点群と対応するｍ×ｎ個の格子状に配列された点から成る基準点群の位置情報を生成する非欠損側基準点群位置情報生成手段と、
d)前記非欠損身体部分の前記基準点群の位置情報と前記非欠損身体部分の表面点群の位置情報に基づき、該基準点群の点を始点とし、該始点の点に対応する位置にある前記表面点群の点を終点とするベクトルデータを生成するベクトルデータ生成手段と、
e)前記非欠損身体部分の表面点群の位置情報から正中線を中心として左右反転させた反転表面点群位置情報を求め、該反転表面点群位置情報と前記欠損身体部分の表面形状の三次元形状データから、前記欠損身体部分の表面の前記再建基礎領域に対応する再建対象領域内に位置するｍ×ｎ個の格子状に配列された点から成る表面点群の位置情報を生成する欠損側表面点群位置情報生成手段と、
f)前記欠損身体部分の表面点群の位置情報の中から前記再建対象領域の周縁に位置する複数の点群の位置情報を抽出する欠損側周縁点群位置情報抽出手段と、
g)前記欠損身体部分の周縁点同士を線分で結び、該線分によって規定される面である基準底面を求め、該基準底面上に位置する、前記表面点群と対応するｍ×ｎ個の格子状に配列された点から成る基準点群の位置情報を生成する欠損側基準点群位置情報生成手段と、
h)前記ベクトルデータを正中線を中心として左右反転させた反転ベクトルデータを生成する反転ベクトルデータ生成手段と、
i)前記欠損身体部分の基準点群の位置情報と前記反転ベクトルデータに基づき前記欠損身体部分に再建するモデルの表面形状の三次元形状データを生成する再建モデル形状データ生成手段と
を有することを特徴とする。
The present invention, which has been made to solve the above-mentioned problems, has a deficient body part in which one or all of a pair of body parts in a symmetrical position with respect to the midline is missing. A reconstruction model shape data creation device for reconstructing the appearance based on the shape of a non-deficient body part,
a) Based on the three-dimensional shape data of the surface shape of the non-deficient body part, m × n (m and n are integers greater than or equal to 3) located in the reconstruction basic region of the surface of the non-deficient body part Non-defect side surface point group position information generating means for generating position information of a surface point group composed of points arranged in a grid pattern;
b) Non-defect side peripheral point group position information extracting means for extracting position information of a plurality of peripheral point groups located at the periphery of the reconstruction basic region from the position information of the surface point group of the non-defect body part;
c) Connecting peripheral points of the non-deficient body part with line segments, obtaining a reference bottom surface that is a surface defined by the line segments, and m × n corresponding to the surface point group located on the reference bottom surface Non-missing side reference point group position information generating means for generating position information of a reference point group consisting of points arranged in a grid pattern;
d) Based on the position information of the reference point group of the non-deficient body part and the position information of the surface point group of the non-deficient body part, the point of the reference point group is a starting point, and the position corresponding to the point of the starting point is Vector data generating means for generating vector data having an end point of the surface point group;
e) Reversing surface point group position information obtained by reversing left and right about the midline from the position information of the surface point group of the non-deficient body part, and obtaining a tertiary of the inverted surface point group position information and the surface shape of the missing body part A defect that generates position information of a surface point group composed of m × n grid-shaped points located in the reconstruction target area corresponding to the reconstruction basic area on the surface of the defective body part from the original shape data Side surface point cloud position information generating means;
f) a defect side peripheral point group position information extracting means for extracting position information of a plurality of point groups located at the periphery of the reconstruction target area from the position information of the surface point group of the defective body part;
g) Connecting peripheral points of the defective body part with line segments, obtaining a reference bottom surface that is a surface defined by the line segments, and mxn pieces corresponding to the surface point group located on the reference bottom surface Deficient side reference point group position information generating means for generating position information of a reference point group consisting of points arranged in a grid pattern;
h) Inverted vector data generating means for generating inverted vector data obtained by horizontally inverting the vector data about a median line;
i) Reconstructed model shape data generating means for generating three-dimensional shape data of a surface shape of a model to be reconstructed in the missing body part based on the positional information of the reference point group of the missing body part and the inverted vector data. Features.
この場合、前記再建モデル形状データ生成手段は、再建するモデルの表面形状の三次元形状データと前記欠損身体部分の表面形状の三次元形状データから、再建するモデル全体の三次元形状データを作成することが好ましい。 In this case, the reconstruction model shape data generation means creates 3D shape data of the entire model to be reconstructed from the 3D shape data of the surface shape of the model to be reconstructed and the 3D shape data of the surface shape of the defective body part. It is preferable.
正中線を挟んで左右対称な位置にある一対の身体部分とは、例えば、乳房や手足、顔面の頬や耳等を指す。また、一対の身体部分は分離していなくても良く、胸部や腹部、臀部等、左右対称な形状の身体部分も、一対の身体部分に含まれることとする。 A pair of body parts located symmetrically with respect to the midline indicates, for example, breasts, limbs, facial cheeks, ears, and the like. In addition, the pair of body parts may not be separated, and the body parts having symmetrical shapes such as the chest, the abdomen, and the buttocks are also included in the pair of body parts.
非欠損身体部分の再建基礎領域とは、非欠損身体部分のうち欠損身体部分を復元するための基礎となる領域を指し、身体部分の一部が欠損している場合には欠損した一部分に対応する非欠損身体部分の一部分を再建基礎領域とし、身体部分の全体が欠損している場合には非欠損身体部分の全体を再建基礎領域とする。再建基礎領域は、身体再建モデル形状データ作成装置の操作者が手動で設定しても良く、三次元形状データに基づき、例えばその他の部分よりも隆起している部分を再建基礎領域として非欠損側表面点群位置情報生成手段が自動的に設定するようにしても良い。 The non-deficient body part reconstruction basic area refers to the area of the non-deficient body part that serves as the basis for restoring the missing body part. If a part of the body part is missing, it corresponds to the missing part. A part of the non-deficient body part to be used is set as a reconstruction basic area, and when the whole body part is missing, the whole non-deficient body part is set as a reconstruction basic area. The reconstruction basic area may be manually set by the operator of the body reconstruction model shape data creation device. Based on the three-dimensional shape data, for example, a portion that is higher than the other part is set as the reconstruction basic area on the non-defect side. The surface point cloud position information generation means may be automatically set.
再建基礎領域内に位置する表面点群の位置情報は、例えば各点のＸＹＺ座標で表すことができる。表面点群の各点の位置は再建基礎領域内にランダムに設定しても良いが、本発明のように、再建基礎領域内をｍ×ｎに分割するメッシュ（格子）の頂点とすると、身体部分の形状や大きさ等に関する個体間の違いに関係なく点群の数や配列を規格化、相同化することができる。このため、再建モデルの表面形状の三次元形状データを作成するための処理が簡単になる。また、点群には、身体部分の特徴を表す点である特徴点を１ないし複数個含まれるようにすると良い。このようにすることで、被検者の身体的特徴を表現した再建モデルの表面形状の三次元形状データを作成することができる。 The position information of the surface point group located in the reconstruction basic region can be expressed by, for example, XYZ coordinates of each point. The position of each point of the surface point group may be set randomly in the reconstruction basic region, but if it is the vertex of a mesh (lattice) that divides the reconstruction basic region into m × n as in the present invention, The number and arrangement of point clouds can be normalized and homogenized regardless of differences between individuals regarding the shape and size of the parts. For this reason, the process for creating the three-dimensional shape data of the surface shape of the reconstruction model is simplified. In addition, the point group may include one or more feature points which are points representing features of the body part. By doing in this way, the three-dimensional shape data of the surface shape of the reconstruction model expressing the physical characteristics of the subject can be created.
非欠損身体部分の基準底面とは、非欠損身体部分、つまり健常な身体部分の形状を規定する面であり、該基準底面と非欠損身体部分の表面で囲まれた部分が、健常な身体部分の全体形状となる。基準底面は身体の内部に位置し、外側から見えないため、本発明では非欠損身体部分の周縁点群の任意の点同士を線分で結び、該線分によって規定される面を基準面とする。また、前記周縁点群の一組の対向する格子列上の点同士を線分で結び、これら線分によって規定される多角面を平滑化処理することにより得られる面を基準底面とすると、基準底面を滑らかな曲面とすることができる。なお、非欠損身体部分の再建基礎領域が略矩形状である場合は、該領域の上辺上の点と、下辺上の点同士を線分で結び、これら線分で規定される多角面を平滑化処理することにより基準面を得ることができる。
なお、上記の説明は、欠損身体部分の再建対象領域や表面点群、基準底面等においても同様に当てはまる。また、欠損身体部分の基準底面の推定方法についても、上記した非欠損身体部分の基準底面の推定方法と同様の方法によって推定することができる。
The reference bottom surface of a non-deficient body part is a surface that defines the shape of a non-deficient body part, that is, a healthy body part, and the part surrounded by the reference bottom surface and the surface of the non-deficient body part is a healthy body part. It becomes the whole shape. Since the reference bottom surface is located inside the body and cannot be seen from the outside, in the present invention, arbitrary points in the peripheral point group of the non-deficient body part are connected by a line segment, and the surface defined by the line segment is defined as the reference surface. To do. Further, if a point obtained by connecting points on a set of opposing grids of the peripheral point group with line segments and smoothing a polygonal surface defined by these line segments is a reference bottom surface, The bottom surface can be a smooth curved surface. In addition, when the reconstruction basic area of the non-defect body part is substantially rectangular, the points on the upper side of the area and the points on the lower side are connected by line segments, and the polygonal surface defined by these line segments is smoothed. The reference plane can be obtained by performing the conversion process.
The above description also applies to a reconstruction target region, a surface point group, a reference bottom surface, and the like of a missing body part. Further, the estimation method of the reference bottom surface of the missing body part can also be estimated by the same method as the above-described estimation method of the reference bottom surface of the non-deficient body part.
また、本発明は、正中線を挟んで左右対称な位置にある一対の身体部分の、一方の一部又は全部が欠損した欠損身体部分を、他方の欠損していない非欠損身体部分の形状に基づいて外観を再建するための再建モデル形状データ作成方法であって、
a)前記非欠損身体部分の表面形状の三次元形状データに基づいて、該非欠損身体部分の表面の再建基礎領域内に位置するｍ×ｎ個（ｍ、ｎはいずれも３以上の整数）の格子状に配列された点から成る表面点群の位置情報を生成し、
b)前記非欠損身体部分の表面点群の位置情報の中から、前記再建基礎領域の周縁に位置する複数の周縁点群の位置情報を抽出し、
c)前記周縁点群の位置情報に基づいて前記非欠損身体部分の基準底面を求め、該基準底面上に位置するｍ×ｎ個の格子状に配列された点から成る基準点群の位置情報を生成し、
d)前記非欠損身体部分の前記基準点群の位置情報と前記非欠損身体部分の表面点群の位置情報に基づき、該基準点群の点を始点とし、該始点の点と対応する位置にある前記表面点群の点を終点とするベクトルデータを生成し、
e)前記非欠損身体部分の表面点群の位置情報から正中線を中心として左右反転させた反転表面点群位置情報を求め、該反転表面点群位置情報と前記欠損身体部分の表面形状の三次元形状データから、前記欠損身体部分の表面の前記再建基礎領域に対応する再建対象領域内に位置するｍ×ｎ個の格子状に配列された点から成る表面点群の位置情報を生成し、
f)前記欠損身体部分の表面点群の位置情報の中から前記再建対象領域の周縁に位置する複数の点群の位置情報を抽出し、
g)前記欠損身体部分の周縁点群の位置情報に基づいて前記欠損身体部分の基準底面を求め、該基準底面上に位置するｍ×ｎ個の格子状に配列された点から成る基準点群の位置情報を生成し、
h)前記ベクトルデータを正中線を中心として左右反転させた反転ベクトルデータを生成し、
i)前記欠損身体部分の基準点群の位置情報と前記反転ベクトルデータに基づき前記欠損身体部分に再建するモデルの表面形状の三次元形状データを作成することを特徴とする。
In addition, the present invention provides a shape of a non-deficient body part that is not deficient in a missing body part in which one or all of a pair of body parts that are symmetric with respect to the midline is missing. A reconstruction model shape data creation method for reconstructing the appearance based on
a) Based on the three-dimensional shape data of the surface shape of the non-deficient body part, m × n (m and n are integers greater than or equal to 3) located in the reconstruction basic region of the surface of the non-deficient body part Generate position information of a surface point group consisting of points arranged in a grid,
b) From the position information of the surface point group of the non-deficient body part, extract the position information of a plurality of peripheral point groups located at the periphery of the reconstruction basic region,
c) Obtaining a reference bottom surface of the non-deficient body part based on the position information of the peripheral point group, and position information of a reference point group composed of m × n latticed points located on the reference bottom surface Produces
d) Based on the position information of the reference point group of the non-deficient body part and the position information of the surface point group of the non-deficient body part, the point of the reference point group is a starting point, and the position corresponding to the point of the starting point is Generate vector data with the point of the surface point group as an end point,
e) Reversing surface point group position information obtained by reversing left and right about the midline from the position information of the surface point group of the non-deficient body part, and obtaining a tertiary of the inverted surface point group position information and the surface shape of the missing body part From the original shape data, to generate position information of a surface point group consisting of points arranged in m × n grids located in the reconstruction target region corresponding to the reconstruction basic region of the surface of the defective body part,
f) Extracting position information of a plurality of point groups located at the periphery of the reconstruction target area from the position information of the surface point group of the missing body part,
g) A reference point group consisting of points arranged in a grid of m × n located on the reference bottom surface, by obtaining a reference bottom surface of the defective body portion based on position information of the peripheral point group of the defective body portion. Generate location information for
h) generating inverted vector data obtained by horizontally inverting the vector data about the midline;
i) Three-dimensional shape data of a surface shape of a model to be reconstructed on the missing body part is created based on position information of a reference point group of the missing body part and the inverted vector data.
さらに、本発明は、正中線を挟んで左右対称な位置にある一対の身体部分の、一方の一部又は全部が欠損した欠損身体部分を、他方の欠損していない非欠損身体部分の形状に基づいて外観を再建するための再建モデル形状データ作成プログラムであって、
コンピュータを、
a)前記非欠損身体部分の表面形状の三次元形状データに基づいて、該非欠損身体部分の表面の再建基礎領域内に位置するｍ×ｎ個（ｍ、ｎはいずれも３以上の整数）の格子状に配列された点から成る表面点群の位置情報を生成する非欠損側表面点群位置情報生成手段、
b)前記非欠損身体部分の表面点群の位置情報の中から、前記再建基礎領域の周縁に位置する複数の周縁点群の位置情報を抽出する非欠損側周縁点群位置情報抽出手段、
c)前記非欠損身体部分の周縁点同士を線分で結び、該線分によって規定される面である基準底面を求め、該基準底面上に位置する、前記表面点群と対応するｍ×ｎ個の格子状に配列された点から成る基準点群の位置情報を生成する非欠損側基準点群位置情報生成手段、
d)前記非欠損身体部分の前記基準点群の位置情報と前記非欠損身体部分の表面点群の位置情報に基づき、該基準点群の点を始点とし、該始点の点に対応する位置にある前記表面点群の点を終点とするベクトルデータを生成するベクトルデータ生成手段、
e)前記非欠損身体部分の表面点群の位置情報から正中線を中心として左右反転させた反転表面点群位置情報を求め、該反転表面点群位置情報と前記欠損身体部分の表面形状の三次元形状データから、前記欠損身体部分の表面の前記再建基礎領域に対応する再建対象領域内に位置するｍ×ｎ個の格子状に配列された点から成る表面点群の位置情報を生成する欠損側表面点群位置情報生成手段、
f)前記欠損身体部分の表面点群の位置情報の中から前記再建対象領域の周縁に位置する複数の点群の位置情報を抽出する欠損側周縁点群位置情報抽出手段、
g)前記欠損身体部分の周縁点同士を線分で結び、該線分によって規定される面である基準底面を求め、該基準底面上に位置する、前記表面点群と対応するｍ×ｎ個の格子状に配列された点から成る基準点群の位置情報を生成する欠損側基準点群位置情報生成手段と、
h)前記ベクトルデータを正中線を中心として左右反転させた反転ベクトルデータを生成する反転ベクトルデータ生成手段、
i)前記欠損身体部分の基準点群の位置情報と前記反転ベクトルデータに基づき前記欠損身体部分に再建するモデルの表面形状の三次元形状データを作成する再建モデル形状データ生成手段
として機能させるためのプログラムである。
Furthermore, the present invention relates to a shape of a non-deficient body part that is not missing, with a missing body part in which one or all of a pair of body parts located symmetrically across the midline is missing. A reconstruction model shape data creation program for reconstructing the appearance based on
Computer
a) Based on the three-dimensional shape data of the surface shape of the non-deficient body part, m × n (m and n are integers greater than or equal to 3) located in the reconstruction basic region of the surface of the non-deficient body part Non-defect side surface point group position information generating means for generating position information of a surface point group composed of points arranged in a grid pattern;
b) Non-defect side peripheral point group position information extracting means for extracting position information of a plurality of peripheral point groups located at the periphery of the reconstruction basic region from the position information of the surface point group of the non-defect body part,
c) Connecting peripheral points of the non-deficient body part with line segments, obtaining a reference bottom surface that is a surface defined by the line segments, and m × n corresponding to the surface point group located on the reference bottom surface Non-defect side reference point group position information generating means for generating position information of a reference point group composed of points arranged in a grid pattern,
d) Based on the position information of the reference point group of the non-deficient body part and the position information of the surface point group of the non-deficient body part, the point of the reference point group is a starting point, and the position corresponding to the point of the starting point is Vector data generating means for generating vector data having a point of the surface point group as an end point;
e) Reversing surface point group position information obtained by reversing left and right about the midline from the position information of the surface point group of the non-deficient body part, and obtaining a tertiary of the inverted surface point group position information and the surface shape of the missing body part A defect that generates position information of a surface point group composed of m × n grid-shaped points located in the reconstruction target area corresponding to the reconstruction basic area on the surface of the defective body part from the original shape data Side surface point cloud position information generating means,
f) a defect side peripheral point group position information extracting means for extracting position information of a plurality of point groups positioned at the periphery of the reconstruction target area from the position information of the surface point group of the defective body part;
g) Connecting peripheral points of the defective body part with line segments, obtaining a reference bottom surface that is a surface defined by the line segments, and mxn pieces corresponding to the surface point group located on the reference bottom surface Deficient side reference point group position information generating means for generating position information of a reference point group consisting of points arranged in a grid pattern;
h) Inverted vector data generating means for generating inverted vector data obtained by horizontally inverting the vector data about a median line,
i) for functioning as a reconstruction model shape data generation means for creating three-dimensional shape data of a surface shape of a model to be reconstructed in the missing body part based on the positional information of the reference point group of the missing body part and the inverted vector data It is a program.
本発明によれば、非欠損身体部分の表面形状及び欠損身体部分の表面形状の三次元形状データから、非欠損身体部分の基準底面及び欠損身体部分の基準底面を推定し、これら基準底面から再建モデルの表面形状の三次元形状データを得、さらにこの表面形状の三次元形状データと欠損身体部分の表面形状の三次元形状データから、再建モデル全体の形状を表す三次元形状データを生成するようにしたため、再建モデルを簡便に作製することができる。 According to the present invention, the reference bottom surface of the non-deficient body part and the reference bottom surface of the defective body part are estimated from the three-dimensional shape data of the surface shape of the non-deficient body part and the surface shape of the defective body part, and reconstruction is performed from these reference bottom surfaces. Obtain 3D shape data of the surface shape of the model, and generate 3D shape data representing the shape of the entire reconstructed model from the 3D shape data of the surface shape and the 3D shape data of the surface shape of the missing body part. Therefore, the reconstruction model can be easily produced.
以下、本発明の具体的な実施例を図面に基づいて説明する。 Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
図１は、身体再建モデル形状データ作成装置の概略構成を示すブロック図である。身体再建モデル形状データ作成装置１（以下、「データ作成装置」という）は、ＣＰＵ１０、ＲＡＭ１２、記憶部１４、入力部１６、表示部１８、出力部２０、入力操作部２２及びこれらを接続する内部バス２４で構成されている。ＣＰＵ１０は、ＲＡＭ１２に記憶されているコンピュータプログラムに従って種々のソフトウェア的機能を実行する。 FIG. 1 is a block diagram illustrating a schematic configuration of a body reconstruction model shape data creation device. The body reconstruction model shape data creation device 1 (hereinafter referred to as “data creation device”) includes a CPU 10, a RAM 12, a storage unit 14, an input unit 16, a display unit 18, an output unit 20, an input operation unit 22, and an internal unit for connecting them. It consists of a bus 24. The CPU 10 executes various software functions according to the computer program stored in the RAM 12.
記憶部１４は、再建対象の身体部分の三次元形状データや、この三次元形状データに基づいて作成した再建モデル形状データを記憶する。なお、再建対象の身体部分（以下、再建身体部分ともいう。）とは、一部或いは全部が欠損した身体部分（以下、欠損身体部分という。）と、この身体部分と正中線を挟んで左右対称な位置にある健常な身体部分であって欠損身体部分と対の関係にある身体部分（以下、健常側身体部分、或いは非欠損身体部分ともいう。）の両方を含む。 The storage unit 14 stores three-dimensional shape data of a body part to be reconstructed and reconstruction model shape data created based on the three-dimensional shape data. A body part to be reconstructed (hereinafter also referred to as a “reconstructed body part”) is a part of the body that has been partially or wholly missing (hereinafter referred to as a “deleted body part”). It includes both healthy body parts that are in symmetrical positions and that have a paired relationship with a missing body part (hereinafter also referred to as a healthy body part or a non-deficient body part).
入力部１６は、再建身体部分の三次元形状データを入力する装置であり、該入力部１６を通して、レーザ式、光学式の非接触の三次元計測装置で得られたデータが入力される。また、ＣＴやＰＥＴ、ＭＲＩで得られたデータや、接触式の三次元計測装置で得られたデータでも良い。表示部１８は、ＣＲＴモニタやＬＣＤ等の表示装置から成り、記憶部１４に記憶されている身体部分の三次元形状データや作成された再建モデルの三次元形状データを三次元画像として表示する。出力部２０はレーザプリンター、ドットプリンターなどの印刷装置である。また、三次元プリンタ（３Ｄプリンタ）やその他の造形装置を出力部２０としても良い。入力操作部２２は、再建モデルの三次元形状データの作成処理に必要なデータを作業者が入力するための装置であり、マウスやキーボードなどである。 The input unit 16 is a device for inputting three-dimensional shape data of the reconstructed body part, and data obtained by a laser-type and optical non-contact three-dimensional measurement device is input through the input unit 16. Further, it may be data obtained by CT, PET, MRI, or data obtained by a contact type three-dimensional measuring apparatus. The display unit 18 includes a display device such as a CRT monitor or an LCD, and displays the 3D shape data of the body part stored in the storage unit 14 and the 3D shape data of the created reconstruction model as a 3D image. The output unit 20 is a printing device such as a laser printer or a dot printer. A three-dimensional printer (3D printer) or other modeling apparatus may be used as the output unit 20. The input operation unit 22 is a device for an operator to input data necessary for the process of creating the three-dimensional shape data of the reconstruction model, and is a mouse, a keyboard, or the like.
図２は、データ作成装置によるデータ作成手順を示すフローチャートである。このフローチャートを参照しつつ、乳房再建のための三次元形状データを作成する場合を例に挙げて説明する。 FIG. 2 is a flowchart showing a data creation procedure by the data creation device. An example of creating three-dimensional shape data for breast reconstruction will be described with reference to this flowchart.
１．再建身体部分の表面形状の計測データの取得（図２のＳ１）
例えばレーザ式の非接触の三次元計測装置で被検者の再建身体部分の表面形状を計測し、計測データを取得する。この計測データは再建身体部分のみの計測データでも良いが、再建身体部分よりも広い範囲の身体部分の計測データでも良い。例えば乳房再建用の三次元形状データを得る場合、乳房だけでなく胸部全体の表面形状を計測し、計測データを得るようにすると良い。計測データは例えば三角形ポリゴンデータの集積から成る。なお、均一で精度の良い計測データを得るために身体部分の表面形状を計測するときは下記の４点に注意する。
1. Acquisition of measurement data of the surface shape of the reconstructed body part (S1 in FIG. 2)
For example, the surface shape of the reconstructed body part of the subject is measured with a laser-type non-contact three-dimensional measuring device, and measurement data is acquired. The measurement data may be measurement data of only the reconstructed body part, or may be measurement data of a body part in a wider range than the reconstructed body part. For example, when obtaining three-dimensional shape data for breast reconstruction, it is preferable to measure the surface shape of not only the breast but the entire chest to obtain measurement data. The measurement data includes, for example, accumulation of triangular polygon data. In order to obtain uniform and accurate measurement data, pay attention to the following four points when measuring the surface shape of the body part.
（1-1）計測装置に対して被検者はまっすぐに立つ。例えば壁面の前に被検者は立ち、後頭部、および両方の肩甲骨を壁面につけた状態で計測する。
（1-2）脇を約15度開いた状態で、両腕を自然な状態で下におろす。
（1-3）左右の肩峰点（肩峰（けんぽう）：肩の上に位置する、肩甲骨にある突起のこと）の高さを同じにする。
（1-4）胸部の表面形状の場合は喉仏から乳房下縁の５cm下まで計測する。
(1-1) The subject stands straight against the measuring device. For example, the subject stands in front of the wall and measures with the occipital region and both scapulas attached to the wall.
(1-2) With both sides open about 15 degrees, lower your arms in a natural state.
(1-3) The heights of the left and right shoulder ridge points (shoulders: the protrusions on the scapula located above the shoulder) should be the same.
(1-4) For the surface shape of the chest, measure from the throat Buddha to 5 cm below the lower edge of the breast.
ここで得られた計測データはオブジェクト座標系のデータから成る。本実施例で用いたオブジェクト座標系は図３に示すＸ軸、Ｙ軸、Ｚ軸から成る。Ｘ軸、Ｙ軸、Ｚ軸は次のように定義されている。
Ｘ軸：表示画面の左部から右部に向かって（身体の右部から左部に向かって）延びる、地面と水平な軸。左から右に向かう方向を正方向とする。
Ｙ軸：地面から垂直な軸。下から上に向かう方向を正方向とする。
Ｚ軸：身体の後部から前部に向かって延びる、地面と水平な軸。後から前に向かう方向を正方向とする。
図４に、計測データに基づき表示部１８の表示画面に表示された身体部分の三次元画像の一例を示す。
The measurement data obtained here consists of data in the object coordinate system. The object coordinate system used in this embodiment is composed of an X axis, a Y axis, and a Z axis shown in FIG. The X axis, Y axis, and Z axis are defined as follows.
X axis: An axis parallel to the ground that extends from the left to the right of the display screen (from the right to the left of the body). The direction from left to right is the positive direction.
Y axis: An axis perpendicular to the ground. The direction from the bottom to the top is the positive direction.
Z axis: An axis parallel to the ground, extending from the back of the body toward the front. The direction from the back to the front is the positive direction.
FIG. 4 shows an example of a three-dimensional image of the body part displayed on the display screen of the display unit 18 based on the measurement data.
２．計測データの調整（図２のＳ２）
上述の（1-1）〜（1-4）に注意して計測しても、被検者の立ち方や姿勢等の癖により、得られた計測データに傾きや回転が含まれる場合がある。そこで、計測データが表す身体部分の姿勢を整えるために、次の（2−1）〜（2−4）の処理によって計測データを調整する。
2. Adjustment of measurement data (S2 in FIG. 2)
Even if measurement is performed while paying attention to the above (1-1) to (1-4), the measurement data obtained may include tilt and rotation due to the way the subject stands and posture . Therefore, in order to adjust the posture of the body part represented by the measurement data, the measurement data is adjusted by the following processes (2-1) to (2-4).
（2-1）Ｙ軸周りの回転
表示画面に表示された身体部分の三次元画像にモアレを発生させて、乳房領域を除いた領域の左右のモアレが対称になるように三次元形状データをＹ軸回りに回転させる。図５の（ａ）は、図４に示す三次元画像、つまりＹ軸周りに回転させる前の三次元画像にモアレを発生させた様子、図５の（ｂ）はＹ軸周りに回転させた後の三次元画像にモアレを発生させた様子を示す。
（2-2）Ｚ軸周りの回転
肩峰点の高さが左右で等しくなるように計測データをＺ軸周りに回転させる。これにより計測データが表す身体部分の左右方向の傾きが調整される。
（2-3）Ｘ軸周りの回転
身体の正中線（胸骨）がＹ軸と一致するように計測データをＸ軸周りに回転させる。これにより、計測データが表す身体部分の前後の傾きが調整される。
（2-4）平行移動
鎖骨の中点と鳩尾を結ぶ線を３：７に内分する点がオブジェクト座標系の原点に位置するように、計測データを平行移動する。
(2-1) Rotation around the Y-axis Moire is generated in the 3D image of the body part displayed on the display screen, and the 3D shape data is converted so that the left and right moire in the area excluding the breast area are symmetrical. Rotate around Y axis. 5A shows a state in which moire is generated in the three-dimensional image shown in FIG. 4, that is, the three-dimensional image before being rotated around the Y axis, and FIG. 5B is rotated around the Y axis. A state in which moire is generated in the later three-dimensional image is shown.
(2-2) Rotation around the Z-axis Rotate the measurement data around the Z-axis so that the height of the shoulder peak is equal on the left and right. Thereby, the inclination of the left-right direction of the body part which measurement data represents is adjusted.
(2-3) Rotation around the X axis Rotate the measurement data around the X axis so that the midline of the body (sternum) matches the Y axis. Thereby, the front-back inclination of the body part represented by the measurement data is adjusted.
(2-4) Translation The measurement data is translated so that the point that internally divides the line connecting the midpoint of the clavicle and the pigeon into 3: 7 is located at the origin of the object coordinate system.
３．メッシュの生成及び割り付け（図２のＳ３）
（3-1）メッシュの生成
調整後の計測データに対し、頂点数が例えば21×21のメッシュを生成する。メッシュの頂点の座標（Ｘ，Ｙ，Ｚ）は、例えば表示画面に表示されている三次元画像上の指定された１０点の位置を示す座標と計測データに基づき作成される周知のポリゴンモデルの頂点座標から得られる。指定点は作業者が入力操作部を操作することにより手動で指定しても良く、自動的に設定されるようにしても良い。図６に示すように、胸部の場合、両脇や鎖骨の中点と鳩尾を結ぶ線分を３：７に内分する点等や左右の乳房の乳頭上の点など、再建身体部分の特徴を表す点（特徴点）が指定点に含まれる。図７に、図６に示す１０個の指定点座標と計測データに基づき作成されたメッシュを、三次元画像と共に示す。
3. Mesh generation and allocation (S3 in FIG. 2)
(3-1) Mesh generation A mesh with 21 × 21 vertices is generated for the adjusted measurement data. The coordinates (X, Y, Z) of the vertices of the mesh are, for example, those of a well-known polygon model created based on the coordinates indicating the positions of ten designated points on the three-dimensional image displayed on the display screen and the measurement data. Obtained from vertex coordinates. The designated point may be designated manually by the operator operating the input operation unit, or may be set automatically. As shown in FIG. 6, in the case of the breast, the features of the reconstructed body part such as a point that divides the line connecting the midpoint of both sides and clavicle and pigeon tail into 3: 7 and points on the nipples of the left and right breasts. A point (feature point) representing is included in the designated point. FIG. 7 shows a mesh created based on the ten designated point coordinates and measurement data shown in FIG. 6 together with a three-dimensional image.
図７に示す例では、メッシュは、表示画面上では頂点数が21×21であり、４個の頂点で規定される面、つまり格子の数が400の格子状のメッシュから成る。しかし、実際は各格子の中にはさらに頂点数が6×6のメッシュが形成されている。従って、メッシュ全体の頂点数は101×101となる。21×21のメッシュと、このメッシュの各格子内の6×6のメッシュの関係を図８に示す。 In the example shown in FIG. 7, the mesh has a number of vertices of 21 × 21 on the display screen, and is composed of a plane defined by four vertices, that is, a lattice-like mesh having 400 lattices. In reality, however, a mesh with 6 × 6 vertices is formed in each grid. Therefore, the number of vertices of the entire mesh is 101 × 101. FIG. 8 shows the relationship between a 21 × 21 mesh and a 6 × 6 mesh in each lattice of the mesh.
21×21のメッシュの頂点、101×101のメッシュの頂点を、それぞれ、メッシュ頂点、格子点と呼ぶ。各頂点を表示画面の左上隅部（被検者の右肩付近に相当）を原点とする二次元座標で表すと、図８に示すように、原点に位置するメッシュ頂点と格子点はいずれも（0,0）となる。
一方、表示画面の右下隅（被検者の左下隅に相当）に位置するメッシュ頂点は（20,20）であるが、格子点は（100,100）となる。その他、メッシュの代表的なラインの位置、及びメッシュ頂点（格子点）の座標を以下に示す。
メッシュの上縁ライン（メッシュ頂点及び格子点の0行目）：鎖骨に重なるライン
メッシュの下縁ライン（メッシュ頂点の20行目／格子点の100行目）：乳房の下縁からおよそ5cm
オブジェクト座標系の原点（鎖骨の中点と鳩尾を３：７に分ける点）：メッシュ頂点(10, 4)／格子点の(50, 20)
右乳房の上縁： メッシュ頂点の(1, 4)〜(9, 4)／格子点の(5, 20)〜(45, 20)
右乳房の下縁：メッシュ頂点の(1, 15)〜(9, 15)／格子点の(5, 75)〜(45, 75)
右乳頭：メッシュ頂点の(5, 11)／格子点の(25, 55)
左乳房の上縁：メッシュ頂点の(11, 4)〜(19, 4)／格子点の(55, 20)〜(95, 20)
左乳房の下縁：メッシュ頂点の(11, 15)〜(19, 15)／格子点の(55, 75)〜(95, 75)
左乳頭：メッシュ頂点の(15, 11)／格子点の(75, 55)
The vertex of the 21 × 21 mesh and the vertex of the 101 × 101 mesh are referred to as a mesh vertex and a lattice point, respectively. If each vertex is represented by two-dimensional coordinates with the upper left corner of the display screen (corresponding to the vicinity of the right shoulder of the subject) as the origin, as shown in FIG. 8, both the mesh vertex and the lattice point located at the origin are (0,0).
On the other hand, the mesh vertex located at the lower right corner of the display screen (corresponding to the lower left corner of the subject) is (20, 20), but the grid point is (100, 100). In addition, the positions of typical lines of the mesh and the coordinates of the mesh vertices (lattice points) are shown below.
Mesh upper edge line (0th line of mesh vertex and grid point): Line overlapping clavicle Mesh lower edge line (20th line of mesh vertex / 100th line of grid point): Approximately 5cm from the lower edge of the breast
The origin of the object coordinate system (the point where the midpoint of the clavicle and the pigeon tail are divided into 3: 7): mesh vertex (10, 4) / grid point (50, 20)
Upper edge of right breast: (1, 4) to (9, 4) of mesh vertex / (5, 20) to (45, 20) of grid point
Lower edge of right breast: (1, 15) to (9, 15) of mesh vertex / (5, 75) to (45, 75) of grid point
Right nipple: (5, 11) of mesh apex / (25, 55) of grid point
Upper edge of left breast: (11, 4) to (19, 4) of mesh vertex / (55, 20) to (95, 20) of grid point
Lower edge of left breast: (11, 15) to (19, 15) of mesh vertex / (55, 75) to (95, 75) of grid point
Left nipple: mesh top (15, 11) / grid point (75, 55)
このようにメッシュの頂点（メッシュ頂点及び格子点）の数を多くすることにより、後述する再建モデルの表面形状の三次元形状データが精密になり、その結果得られる再建モデルを精密にすることができる。 By increasing the number of mesh vertices (mesh vertices and grid points) in this way, the three-dimensional shape data of the surface shape of the reconstruction model, which will be described later, becomes precise, and the resulting reconstruction model can be refined. it can.
（3-2）メッシュの割り付け
上述したように、本実施例では、身体部分の三次元形状データと指定点の座標データからコンピュータが自動的にメッシュの各頂点のＸＹＺ座標から成るデータ（頂点データ）を作成する。作成されたメッシュは身体部分の表面をぴったりと覆っているが、被検者の身体的特徴を正確に表現するには不十分である。
(3-2) Mesh Allocation As described above, in this embodiment, the computer automatically generates the data (vertex data) of the XYZ coordinates of each vertex of the mesh from the three-dimensional shape data of the body part and the coordinate data of the designated point. ). The created mesh covers the surface of the body part exactly, but is insufficient to accurately represent the physical characteristics of the subject.
そこで、メッシュを個々の被検者の身体的特徴を再現できるように変形する作業、つまり、メッシュの頂点データを身体部分の三次元形状データに合わせる作業としての割り付け処理を実行する。割り付け処理には、周知のＺバッファ法（非特許文献１及び２）を用いる。 Therefore, an assignment process is performed as a work for deforming the mesh so that the physical characteristics of each subject can be reproduced, that is, a work for matching the vertex data of the mesh with the three-dimensional shape data of the body part. A well-known Z buffer method (Non-Patent Documents 1 and 2) is used for the allocation process.
メッシュの割り付け処理は、まず、健常側身体部分に対して行う。そのため、表示画面の三次元画像における健常側身体部分の領域（本発明の再建基礎領域に相当）を設定する。例えば乳房の場合は、肩から下に降りていき、乳房のふくらみが始まるあたりを上辺、ブラジャーのワイヤーが当たるラインを下辺とする略矩形形状の乳房領域を設定し、この乳房領域に対してメッシュを割り付ける。この結果、自動的に作成されたメッシュの各頂点の座標（Ｘ，Ｙ，Ｚ）が身体部分の表面の三次元形状データの座標に更新され、メッシュは被検者の身体的特徴を再現するように変形される。 First, the mesh allocation process is performed on the healthy body part. Therefore, the region of the healthy body part (corresponding to the reconstruction basic region of the present invention) in the three-dimensional image on the display screen is set. For example, in the case of a breast, set a substantially rectangular breast area that descends from the shoulder, the upper side is where the breast begins to bulge, and the lower side is the line where the bra wire hits. Is assigned. As a result, the coordinates (X, Y, Z) of each vertex of the automatically created mesh are updated to the coordinates of the three-dimensional shape data of the surface of the body part, and the mesh reproduces the physical characteristics of the subject. It is deformed as follows.
（3-3）反転メッシュの作成及び割り付け
健常側身体部分にメッシュを割り付けた後、そのメッシュデータを正中線を中心に左右反転する。この段階では、反転させたメッシュの各頂点のＺ座標は健常側身体部分のＺ座標であるため、メッシュの各頂点は欠損身体部分の表面から離れている。そこで反転メッシュについても、各頂点データと三次元形状データを位置合わせするための割り付け処理を実行する。この結果、反転メッシュの頂点データの座標（Ｘ，Ｙ、Ｚ）が新しい座標に変更され、反転メッシュが欠損身体部分の表面に沿うように変形される。
(3-3) Creation and allocation of inverted mesh After allocating a mesh to the healthy body part, the mesh data is inverted horizontally about the midline. At this stage, since the Z coordinate of each vertex of the inverted mesh is the Z coordinate of the healthy body part, each vertex of the mesh is away from the surface of the missing body part. Therefore, an allocation process for aligning each vertex data and the three-dimensional shape data is executed for the inverted mesh. As a result, the coordinates (X, Y, Z) of the vertex data of the inverted mesh are changed to new coordinates, and the inverted mesh is deformed so as to follow the surface of the missing body part.
なお、メッシュ及び反転メッシュの割り付け処理を実行するにあたっては、表示画面に表示された身体部分の表面形状をいろいろな方向から見て、表面の法線ベクトルに沿う方向にメッシュ及び反転メッシュの頂点を移動させて該表面に貼り付けるようにすると良い。この作業は、例えば、表示画面上の三次元画像を適宜の方向に回転させながら行うことができる。このように法線ベクトルに沿う方向にメッシュ及び反転メッシュを移動させることにより、曲面である再建身体部分の表面に対して頂点が略等間隔に位置するようにメッシュ及び反転メッシュを割り付けることができる。 When executing the mesh and inverted mesh assignment processing, the surface shape of the body part displayed on the display screen is viewed from various directions, and the vertexes of the mesh and inverted mesh are set in the direction along the normal vector of the surface. It is good to move and stick on the surface. This operation can be performed, for example, while rotating a three-dimensional image on the display screen in an appropriate direction. By moving the mesh and the inverted mesh in the direction along the normal vector in this way, the mesh and the inverted mesh can be allocated so that the vertices are positioned at substantially equal intervals with respect to the surface of the reconstructed body part that is a curved surface. .
また、人間の身体は完全な左右対称形ではないため、健常側の身体部分に割り付けたメッシュを左右反転させただけの反転メッシュは、欠損側の身体部分に対して、Ｘ軸、Ｙ軸方向にもずれが生じる場合がある。従って、割り付け処理では、元のメッシュ形状をできるだけ損なわないように留意しつつ、Ｘ軸方向、Ｙ軸方向にも反転メッシュの頂点を移動させるようにする。そのため、本実施例では、表示画面に表示された三次元画像上のメッシュの頂点や格子点をマウス等で指示しながらＸ軸方向、Ｙ軸方向に移動させて割り付け処理を実行することができるようになっている。 In addition, since the human body is not completely bilaterally symmetric, the inverted mesh that is simply left-right reversed of the mesh assigned to the healthy body part is in the X-axis and Y-axis directions with respect to the defective body part. Also, there may be a deviation. Therefore, in the allocation process, the vertex of the inverted mesh is moved also in the X-axis direction and the Y-axis direction while taking care not to damage the original mesh shape as much as possible. Therefore, in this embodiment, the allocation process can be executed by moving the mesh vertices and lattice points on the three-dimensional image displayed on the display screen in the X-axis direction and the Y-axis direction while pointing with a mouse or the like. It is like that.
４．基準底面の推定（図２のＳ４）
基準底面とは、健常側及び欠損側の身体部分の形状を規定する面であり、基準底面と表面で囲まれた部分の形状が身体部分の全体形状となる。乳房の場合は胸板が基準底面となる。基準底面は外側から見えないため、健常側及び欠損側のいずれについても、身体部分に割り付けた後のメッシュ及び反転メッシュから推定する。
まず、身体部分の周縁に位置するメッシュの頂点を抽出する。これら周縁部の頂点のうち、身体部分の上縁と下縁に位置する頂点（ただし、上縁及び下縁の左端及び右端に位置する頂点を除く）同士を直線で結ぶ。
4). Estimation of reference bottom surface (S4 in FIG. 2)
The reference bottom surface is a surface that defines the shape of the body part on the healthy side and the defect side, and the shape of the part surrounded by the reference bottom surface and the surface is the overall shape of the body part. In the case of the breast, the chest plate is the reference bottom surface. Since the reference bottom surface cannot be seen from the outside, both the healthy side and the defect side are estimated from the mesh and the inverted mesh after being assigned to the body part.
First, the vertices of the mesh located at the periphery of the body part are extracted. Among the vertices of the peripheral portion, the vertices located on the upper edge and the lower edge of the body part (except for the vertices located on the left and right edges of the upper edge and the lower edge) are connected with a straight line.
図７に示すように、乳房の場合は、乳房領域のメッシュは9×12であり、上縁及び下縁にはそれぞれ9個の頂点があるため、そのうち両端の2個を除いた7個の頂点同士を直線で結ぶ。なお、実際は9×12のメッシュの各格子面に6×6のメッシュを設けているため、健常側及び欠損側の乳房に割り付けたメッシュは、いずれも41×56のメッシュで構成されていることになり、上縁の39個の頂点及び下縁の39個の頂点同士を直線で結ぶことになる。 As shown in FIG. 7, in the case of the breast, the mesh of the breast region is 9 × 12, and there are 9 vertices at the upper edge and the lower edge. Connect vertices with straight lines. In fact, since a 6x6 mesh is provided on each lattice plane of a 9x12 mesh, the meshes assigned to the healthy and defective breasts are both 41x56 meshes. Thus, 39 vertices at the upper edge and 39 vertices at the lower edge are connected by a straight line.
上縁上の複数の頂点が同一直線上になく、また、下縁上の複数の頂点が同一直線上にないため、上縁及び下縁上の頂点同士を直線で結び、これら直線とメッシュ周縁の頂点から規定される面は凹凸した多角面となる。そこで、平滑化処理を施し、直線とメッシュ周縁の頂点から規定される面を滑らかな曲面にする。
平滑化処理では、メッシュの頂点（メッシュ頂点及び格子点）のうち注目する１点とその周りの８個の頂点の合計９個の頂点の移動平均をとり、その結果得られる値を注目する１点の座標（Ｘ、Ｙ、Ｚ）とする。ただし、身体部分の周縁に位置する頂点については移動平均をとらず、身体部分の表面に割り付けたときの座標（Ｘ、Ｙ、Ｚ）値とする。平滑化処理は、上記の移動平均を求める処理を例えば２０回繰り返す。図９に平滑化処理の結果、得られた非欠損側の基準底面（胸板）及び欠損側の基準底面の一部の三次元画像を示す。
Since the vertices on the upper edge are not collinear, and the vertices on the lower edge are not collinear, connect the vertices on the upper and lower edges with a straight line. The surface defined from the apex of is an uneven polygonal surface. Therefore, a smoothing process is performed to make the surface defined by the straight line and the vertex of the mesh periphery a smooth curved surface.
In the smoothing process, a moving average of a total of nine vertices of one point of interest of the mesh vertices (mesh vertices and grid points) and eight vertices around it is taken, and the resulting value is noted 1 The coordinates of the point (X, Y, Z) are used. However, for the vertices located at the periphery of the body part, the moving average is not taken, but the coordinates (X, Y, Z) values when assigned to the surface of the body part are used. In the smoothing process, the process for obtaining the moving average is repeated 20 times, for example. FIG. 9 shows a three-dimensional image of a part of the non-defect side reference bottom surface (chest plate) and the defect side reference bottom surface obtained as a result of the smoothing process.
５．ベクトルデータの生成（図２のＳ５）
健常側身体部分の表面に割り付けたメッシュデータと、基準底面上の頂点データに基づき、基準底面上の頂点を始点とし、メッシュの頂点を終点とするベクトルのデータを作成する。このとき、ベクトルデータの始点となる頂点の基準底面における位置と、終点となる頂点のメッシュにおける位置を対応させる。本実施例では、健常側身体部分の表面に割り付けたメッシュの頂点データと基準底面上の頂点データは、頂点の数、及び配置が同じであり、且つ、その頂点が解剖学的な意味を持つ相同モデルであるため、対応するメッシュの頂点と基準底面の頂点の座標の差分値がベクトルデータとなる。図１０に、乳房再建の場合に得られたベクトルデータが示すベクトルの一例を示す。図１０中、ベクトルの始点付近に位置する滑らかな曲面が基準底面である。なお、実際は基準底面上の頂点の数だけベクトルがあるため、基準底面上に多数のベクトルが密集することになるが、図１０では基準底面上からベクトルが延びている様子が分かり易いように、ベクトルを間引いて示す。
5. Generation of vector data (S5 in FIG. 2)
Based on the mesh data assigned to the surface of the healthy body part and the vertex data on the reference bottom surface, vector data having a vertex on the reference bottom surface as a start point and a vertex on the mesh as an end point is created. At this time, the position of the vertex that is the starting point of the vector data on the reference bottom surface is associated with the position of the vertex that is the ending point in the mesh. In this embodiment, the vertex data of the mesh assigned to the surface of the healthy body part and the vertex data on the reference bottom face have the same number of vertices and arrangement, and the vertices have an anatomical meaning. Since it is a homologous model, the difference value between the coordinates of the corresponding mesh vertex and the reference bottom vertex becomes vector data. FIG. 10 shows an example of a vector indicated by vector data obtained in the case of breast reconstruction. In FIG. 10, a smooth curved surface located near the starting point of the vector is the reference bottom surface. In fact, since there are vectors as many as the number of vertices on the reference bottom surface, many vectors are concentrated on the reference bottom surface, but in FIG. 10 it is easy to understand how the vectors extend from the reference bottom surface. The vector is thinned out.
６．再建モデルの表面形状データの生成（図２のＳ６）
ベクトルデータを正中線を中心に左右反転させた反転ベクトルデータを求め、この反転ベクトルの始点が欠損身体部分の基準底面上の各頂点となるように反転ベクトルデータを変換する。反転ベクトルデータと基準底面の各頂点のデータも相同モデルであるため、ある反転ベクトルに対応する欠損身体部分の基準底面上の頂点の座標が、変換後の反転ベクトルデータの始点になり、変換後の反転ベクトルデータの終点が、再建モデルの表面に位置する座標となる。つまり、変換後の反転ベクトルデータの終点が再建モデルの表面形状を表す三次元形状データとなる。
図１０に示すベクトルと、該ベクトルの変換後の反転ベクトルを図１１に示す。
6). Generation of surface shape data of reconstruction model (S6 in FIG. 2)
Inverted vector data is obtained by reversing the vector data left and right around the midline, and the inverted vector data is converted so that the starting point of the inverted vector is each vertex on the reference bottom surface of the missing body part. Since the inverted vector data and the data of each vertex of the reference bottom are also homologous models, the coordinates of the vertex on the reference bottom of the missing body part corresponding to a certain inverted vector become the starting point of the inverted vector data after conversion, and after conversion The end point of the inversion vector data is the coordinates located on the surface of the reconstruction model. That is, the end point of the inverted vector data after conversion becomes three-dimensional shape data representing the surface shape of the reconstruction model.
FIG. 11 shows the vector shown in FIG. 10 and the inverted vector after conversion of the vector.
７．再建モデルの全体形状データの生成（図２のＳ７）
再建モデルの裏面形状のデータは、欠損身体部分の表面形状の計測データの姿勢を整えた後のデータ（三次元形状データ）となる。欠損身体部分の表面形状の三次元形状データと、再建モデルの表面形状を表す三次元形状データは、周縁部に位置する点群を共有するため、これら共有する点群で、欠損身体部分の表面形状の三次元形状データと、再建モデルの表面形状を表す三次元形状データを結合することにより、再建モデルの全体形状を表すデータが生成される。
7). Generation of overall shape data of reconstruction model (S7 in FIG. 2)
The data of the back surface shape of the reconstruction model is data (three-dimensional shape data) after adjusting the posture of the measurement data of the surface shape of the missing body part. Since the three-dimensional shape data of the surface shape of the missing body part and the three-dimensional shape data representing the surface shape of the reconstruction model share the point cloud located at the peripheral part, the surface of the missing body part is shared by these shared point groups. By combining the three-dimensional shape data of the shape and the three-dimensional shape data representing the surface shape of the reconstruction model, data representing the entire shape of the reconstruction model is generated.
このようにして得られた再建モデルの全体形状を表すデータに基づき作製された乳房再建モデルの三次元画像を図１２に示す。図１２中、(ａ）は正面から見た三次元画像、（ｂ）は裏側から見た三次元画像、（ｃ）は推定した基準底面（胸板）を裏側からみた三次元画像、（ｄ）は斜め前方から見た三次元画像、（ｅ）は斜め後方から見た三次元画像を示す。 FIG. 12 shows a three-dimensional image of the breast reconstruction model created based on the data representing the entire shape of the reconstruction model obtained in this way. In FIG. 12, (a) is a three-dimensional image viewed from the front, (b) is a three-dimensional image viewed from the back side, (c) is a three-dimensional image viewed from the back side of the estimated reference bottom surface (breast plate), (d). Indicates a three-dimensional image viewed from diagonally forward, and (e) indicates a three-dimensional image viewed from diagonally backward.
このように本実施例では、表示画面に表示された三次元画像を使って再建モデルの全体形状を表すデータを作成することができるため、簡単且つ安価に、元の形状を正確に復元した再建モデルを作製することができる。また、人工材料を欠損身体部分に挿入するインプラント法や、腹部等の皮膚や皮下組織を欠損身体部分に移植（移動）させる皮弁移植法のような手法においても、欠損身体部分の三次元形状データと欠損身体部分の表面形状を表す三次元形状データから、挿入する人工材料の量や、移植する皮下組織、皮膚の量を正確に推定できるというメリットがある。 As described above, in this embodiment, since the data representing the entire shape of the reconstruction model can be created using the three-dimensional image displayed on the display screen, the reconstruction that accurately and accurately restored the original shape can be performed easily and inexpensively. A model can be created. The three-dimensional shape of the defective body part is also used in methods such as an implant method in which an artificial material is inserted into the defective body part and a flap transplantation method in which skin or subcutaneous tissue such as the abdomen is transplanted (moved) to the defective body part. There is an advantage that the amount of artificial material to be inserted, the subcutaneous tissue to be transplanted, and the amount of skin can be accurately estimated from the data and the three-dimensional shape data representing the surface shape of the defective body part.
また、本実施例において作成された再建モデルは、身体が完全な左右対称形ではないことを考慮した上で元の形状を復元するため、再建モデルを欠損身体部分に装着したときの違和感はもちろん、外観上の違和感をも低減することができる。そのため、身体の一部が失われた人の精神的ストレスの緩和、予後の生活の質をより一層向上することができる。 In addition, the reconstruction model created in this example restores the original shape in consideration of the fact that the body is not completely symmetrical, so of course there is a sense of incongruity when the reconstruction model is attached to a defective body part In addition, a sense of incongruity in appearance can be reduced. Therefore, it is possible to alleviate mental stress and improve the quality of life of a person who has lost a part of their body.
１０…ＣＰＵ
１２…ＲＡＭ
１４…記憶部
１６…入力部
１８…表示部
２０…出力部
２２…入力操作部
２４…内部バス
10 ... CPU
12 ... RAM
DESCRIPTION OF SYMBOLS 14 ... Memory | storage part 16 ... Input part 18 ... Display part 20 ... Output part 22 ... Input operation part 24 ... Internal bus
Claims (10)
a)前記非欠損身体部分の表面形状の三次元形状データに基づいて、該非欠損身体部分の表面の再建基礎領域内に位置するｍ×ｎ個（ｍ、ｎはいずれも３以上の整数）の格子状に配列された点から成る表面点群の位置情報を生成する非欠損側表面点群位置情報生成手段と、
b)前記非欠損身体部分の表面点群の位置情報の中から、前記再建基礎領域の周縁に位置する複数の周縁点群の位置情報を抽出する非欠損側周縁点群位置情報抽出手段と、
c)前記非欠損身体部分の周縁点同士を線分で結び、該線分によって規定される面である基準底面を求め、該基準底面上に位置する、前記表面点群と対応するｍ×ｎ個の格子状に配列された点から成る基準点群の位置情報を生成する非欠損側基準点群位置情報生成手段と、
d)前記非欠損身体部分の前記基準点群の位置情報と前記非欠損身体部分の表面点群の位置情報に基づき、該基準点群の点を始点とし、該始点の点に対応する位置にある前記表面点群の点を終点とするベクトルデータを生成するベクトルデータ生成手段と、
e)前記非欠損身体部分の表面点群の位置情報から正中線を中心として左右反転させた反転表面点群位置情報を求め、該反転表面点群位置情報と前記欠損身体部分の表面形状の三次元形状データから、前記欠損身体部分の表面の前記再建基礎領域に対応する再建対象領域内に位置するｍ×ｎ個の格子状に配列された点から成る表面点群の位置情報を生成する欠損側表面点群位置情報生成手段と、
f)前記欠損身体部分の表面点群の位置情報の中から前記再建対象領域の周縁に位置する複数の点群の位置情報を抽出する欠損側周縁点群位置情報抽出手段と、
g)前記欠損身体部分の周縁点同士を線分で結び、該線分によって規定される面である基準底面を求め、該基準底面上に位置する、前記表面点群と対応するｍ×ｎ個の格子状に配列された点から成る基準点群の位置情報を生成する欠損側基準点群位置情報生成手段と、
h)前記ベクトルデータを正中線を中心として左右反転させた反転ベクトルデータを生成する反転ベクトルデータ生成手段と、
i)前記欠損身体部分の基準点群の位置情報と前記反転ベクトルデータに基づき前記欠損身体部分に再建するモデルの表面形状の三次元形状データを生成する再建モデル形状データ生成手段と
を有することを特徴とする身体再建モデル形状データ作成装置。 Reconstruct the appearance of a missing body part in which one or all of a pair of body parts located symmetrically across the midline is missing based on the shape of the other non-deficient body part A reconstruction model shape data creation device for
a) Based on the three-dimensional shape data of the surface shape of the non-deficient body part, m × n (m and n are integers greater than or equal to 3) located in the reconstruction basic region of the surface of the non-deficient body part Non-defect side surface point group position information generating means for generating position information of a surface point group composed of points arranged in a grid pattern;
b) Non-defect side peripheral point group position information extracting means for extracting position information of a plurality of peripheral point groups located at the periphery of the reconstruction basic region from the position information of the surface point group of the non-defect body part;
c) Connecting peripheral points of the non-deficient body part with line segments, obtaining a reference bottom surface that is a surface defined by the line segments, and m × n corresponding to the surface point group located on the reference bottom surface Non-missing side reference point group position information generating means for generating position information of a reference point group consisting of points arranged in a grid pattern;
d) Based on the position information of the reference point group of the non-deficient body part and the position information of the surface point group of the non-deficient body part, the point of the reference point group is a starting point, and the position corresponding to the point of the starting point is Vector data generating means for generating vector data having an end point of the surface point group;
e) Reversing surface point group position information obtained by reversing left and right about the midline from the position information of the surface point group of the non-deficient body part, and obtaining a tertiary of the inverted surface point group position information and the surface shape of the missing body part A defect that generates position information of a surface point group composed of m × n grid-shaped points located in the reconstruction target area corresponding to the reconstruction basic area on the surface of the defective body part from the original shape data Side surface point cloud position information generating means;
f) a defect side peripheral point group position information extracting means for extracting position information of a plurality of point groups located at the periphery of the reconstruction target area from the position information of the surface point group of the defective body part;
g) Connecting peripheral points of the defective body part with line segments, obtaining a reference bottom surface that is a surface defined by the line segments, and mxn pieces corresponding to the surface point group located on the reference bottom surface Deficient side reference point group position information generating means for generating position information of a reference point group consisting of points arranged in a grid pattern;
h) Inverted vector data generating means for generating inverted vector data obtained by horizontally inverting the vector data about a median line;
i) Reconstructed model shape data generating means for generating three-dimensional shape data of a surface shape of a model to be reconstructed in the missing body part based on the positional information of the reference point group of the missing body part and the inverted vector data. Characteristic body reconstruction model shape data creation device.
a)前記非欠損身体部分の表面形状の三次元形状データに基づいて、該非欠損身体部分の表面の再建基礎領域内に位置するｍ×ｎ個（ｍ、ｎはいずれも３以上の整数）の格子状に配列された点から成る表面点群の位置情報を生成し、
b)前記非欠損身体部分の表面点群の位置情報の中から、前記再建基礎領域の周縁に位置する複数の周縁点群の位置情報を抽出し、
c)前記非欠損身体部分の周縁点同士を線分で結び、該線分によって規定される面である基準底面を求め、該基準底面上に位置する、前記表面点群と対応するｍ×ｎ個の格子状に配列された点から成る基準点群の位置情報を生成し、
d)前記非欠損身体部分の前記基準点群の位置情報と前記非欠損身体部分の表面点群の位置情報に基づき、該基準点群の点を始点とし、該始点の点に対応する位置にある前記表面点群の点を終点とするベクトルデータを生成し、
e)前記非欠損身体部分の表面点群の位置情報から正中線を中心として左右反転させた反転表面点群位置情報を求め、該反転表面点群位置情報と前記欠損身体部分の表面形状の三次元形状データから、前記欠損身体部分の表面の前記再建基礎領域に対応する再建対象領域内に位置するｍ×ｎ個の格子状に配列された点から成る表面点群の位置情報を生成し、
f)前記欠損身体部分の表面点群の位置情報の中から前記再建対象領域の周縁に位置する複数の周縁点群の位置情報を抽出し、
g)前記欠損身体部分の周縁点同士を線分で結び、該線分によって規定される面である基準底面を求め、該基準底面上に位置するｍ×ｎ個の格子状に配列された点から成る基準点群の位置情報を生成し、
h)前記ベクトルデータを正中線を中心として左右反転させた反転ベクトルデータを生成し、
i)前記欠損身体部分の基準点群の位置情報と前記反転ベクトルデータに基づき前記欠損
身体部分に再建するモデルの表面形状の三次元形状データを作成する
ことを特徴とする身体再建モデル形状データ作成方法。 Reconstruct the appearance of a missing body part in which one or all of a pair of body parts located symmetrically across the midline is missing based on the shape of the other non-deficient body part A reconstruction model shape data creation method for
a) Based on the three-dimensional shape data of the surface shape of the non-deficient body part, m × n (m and n are integers greater than or equal to 3) located in the reconstruction basic region of the surface of the non-deficient body part Generate position information of a surface point group consisting of points arranged in a grid,
b) From the position information of the surface point group of the non-deficient body part, extract the position information of a plurality of peripheral point groups located at the periphery of the reconstruction basic region,
c) Connecting peripheral points of the non-deficient body part with line segments, obtaining a reference bottom surface that is a surface defined by the line segments, and m × n corresponding to the surface point group located on the reference bottom surface Generate position information of a reference point group consisting of points arranged in a grid,
d) Based on the position information of the reference point group of the non-deficient body part and the position information of the surface point group of the non-deficient body part, the point of the reference point group is a starting point, and the position corresponding to the point of the starting point is Generate vector data with the point of the surface point group as an end point,
e) Reversing surface point group position information obtained by reversing left and right about the midline from the position information of the surface point group of the non-deficient body part, and obtaining a tertiary of the inverted surface point group position information and the surface shape of the missing body part From the original shape data, to generate position information of a surface point group consisting of points arranged in m × n grids located in the reconstruction target region corresponding to the reconstruction basic region of the surface of the defective body part,
f) Extracting positional information of a plurality of peripheral point groups located at the peripheral edge of the reconstruction target region from the positional information of the surface point group of the defective body part,
g) Points that are arranged in m × n grids located on the reference bottom surface by connecting the peripheral points of the defective body part with line segments, obtaining a reference bottom surface that is a surface defined by the line segment Generate position information of a reference point cloud consisting of
h) generating inverted vector data obtained by horizontally inverting the vector data about the midline;
i) Body reconstruction model shape data creation characterized by creating 3D shape data of a surface shape of a model to be reconstructed in the missing body part based on positional information of the reference point group of the missing body part and the inverted vector data Method.
コンピュータを、
a)前記非欠損身体部分の表面形状の三次元形状データに基づいて、該非欠損身体部分の表面の再建基礎領域内に位置するｍ×ｎ個（ｍ、ｎはいずれも３以上の整数）の格子状に配列された点から成る表面点群の位置情報を生成する非欠損側表面点群位置情報生成手段、
b)前記非欠損身体部分の表面点群の位置情報の中から、前記再建基礎領域の周縁に位置する複数の周縁点群の位置情報を抽出する非欠損側周縁点群位置情報抽出手段、
c)前記非欠損身体部分の周縁点同士を線分で結び、該線分によって規定される面である基準底面を求め、該基準底面上に位置する、前記表面点群と対応するｍ×ｎ個の格子状に配列された点から成る基準点群の位置情報を生成する非欠損側基準点群位置情報生成手段、
d)前記非欠損身体部分の前記基準点群の位置情報と前記非欠損身体部分の表面点群の位置情報に基づき、該基準点群の点を始点とし、該始点の点に対応する位置にある前記表面点群の点を終点とするベクトルデータを生成するベクトルデータ生成手段、
e)前記非欠損身体部分の表面点群の位置情報から正中線を中心として左右反転させた反転表面点群位置情報を求め、該反転表面点群位置情報と前記欠損身体部分の表面形状の三次元形状データから、前記欠損身体部分の表面の前記再建基礎領域に対応する再建対象領域内に位置するｍ×ｎ個の格子状に配列された点から成る表面点群の位置情報を生成する欠損側表面点群位置情報生成手段、
f)前記欠損身体部分の表面点群の位置情報の中から前記再建対象領域の周縁に位置する複数の点群の位置情報を抽出する欠損側周縁点群位置情報抽出手段、
g)前記欠損身体部分の周縁点同士を線分で結び、該線分によって規定される面である基準底面を求め、該基準底面上に位置する、前記表面点群と対応するｍ×ｎ個の格子状に配列された点から成る基準点群の位置情報を生成する欠損側基準点群位置情報生成手段と、
h)前記ベクトルデータを正中線を中心として左右反転させた反転ベクトルデータを生成する反転ベクトルデータ生成手段、
i)前記欠損身体部分の基準点群の位置情報と前記反転ベクトルデータに基づき前記欠損身体部分に再建するモデルの表面形状の三次元形状データを作成する再建モデル形状データ生成手段
として機能させるためのプログラム。 Reconstruct the appearance of a missing body part in which one or all of a pair of body parts located symmetrically across the midline is missing based on the shape of the other non-deficient body part A reconstruction model shape data creation program for
Computer
a) Based on the three-dimensional shape data of the surface shape of the non-deficient body part, m × n (m and n are integers greater than or equal to 3) located in the reconstruction basic region of the surface of the non-deficient body part Non-defect side surface point group position information generating means for generating position information of a surface point group composed of points arranged in a grid pattern;
b) Non-defect side peripheral point group position information extracting means for extracting position information of a plurality of peripheral point groups located at the periphery of the reconstruction basic region from the position information of the surface point group of the non-defect body part,
c) Connecting peripheral points of the non-deficient body part with line segments, obtaining a reference bottom surface that is a surface defined by the line segments, and m × n corresponding to the surface point group located on the reference bottom surface Non-defect side reference point group position information generating means for generating position information of a reference point group composed of points arranged in a grid pattern,
d) Based on the position information of the reference point group of the non-deficient body part and the position information of the surface point group of the non-deficient body part, the point of the reference point group is a starting point, and the position corresponding to the point of the starting point is Vector data generating means for generating vector data having a point of the surface point group as an end point;
e) Reversing surface point group position information obtained by reversing left and right about the midline from the position information of the surface point group of the non-deficient body part, and obtaining a tertiary of the inverted surface point group position information and the surface shape of the missing body part A defect that generates position information of a surface point group composed of m × n grid-shaped points located in the reconstruction target area corresponding to the reconstruction basic area on the surface of the defective body part from the original shape data Side surface point cloud position information generating means,
f) a defect side peripheral point group position information extracting means for extracting position information of a plurality of point groups positioned at the periphery of the reconstruction target area from the position information of the surface point group of the defective body part;
g) Connecting peripheral points of the defective body part with line segments, obtaining a reference bottom surface that is a surface defined by the line segments, and mxn pieces corresponding to the surface point group located on the reference bottom surface Deficient side reference point group position information generating means for generating position information of a reference point group consisting of points arranged in a grid pattern;
h) Inverted vector data generating means for generating inverted vector data obtained by horizontally inverting the vector data about a median line,
i) for functioning as a reconstruction model shape data generation means for creating three-dimensional shape data of a surface shape of a model to be reconstructed in the missing body part based on the positional information of the reference point group of the missing body part and the inverted vector data program.
a)前記健常側乳房の三次元形状データに基づいて該健常側乳房の表面に位置するｍ×ｎ個（ｍ、ｎはいずれも３以上の整数）の格子状に配列された点からなる表面点群の位置情報を生成する健常側表面点群位置情報生成手段と、
b)前記健常側乳房の表面点群のうち該健常側乳房の周縁部に位置する複数の周縁点群の位置情報を抽出する健常側周縁点群位置情報抽出手段と、
c)前記健常側乳房の周縁点同士を線分で結び、該線分によって規定される面である基準底面を求め、該基準底面上に位置するｍ×ｎ個の格子状に配列された点からなる基準点群の位置情報を生成する健常側基準点群位置情報生成手段と、
d)前記健常側乳房の基準点群の位置情報と、該点群に対応する表面点群の位置情報に基づき、該基準点群の点を始点とし、該始点の点に対応する位置にある前記表面点群の点を終点とするベクトルデータを生成するベクトルデータ生成手段と、
e)前記健常側乳房の表面点群の位置情報から正中線を中心として左右反転させた反転表面点群位置情報を求め、該反転表面点群位置情報と前記欠損側乳房の表面形状の三次元形状データから、該欠損側乳房の表面の前記再建基礎領域に対応する再建対象領域内に位置するｍ×ｎ個の格子状に配列された点から成る表面点群の位置情報を生成する欠損側乳房表面点群位置情報生成手段と、
f)前記欠損側乳房の表面点群の位置情報の中から該欠損側乳房の再建対象領域の周縁に位置する複数の周縁点群の位置情報を抽出する欠損側乳房周縁点群位置情報抽出手段と、
g)前記欠損側乳房の周縁点同士を線分で結び、該線分によって規定される面である基準底面を求め、該基準底面上に位置する、前記表面点群と対応するｍ×ｎ個の格子状に配列された点から成る基準点群の位置情報を生成する欠損側乳房基準点群情報生成手段と、
h)前記ベクトルデータを正中線を中心として左右反転させた反転ベクトルデータを生成する反転ベクトル生成手段と、
i)前記欠損側乳房の基準点群の位置情報と前記反転ベクトルデータに基づき前記欠損側乳房に再建する乳房再建モデルの表面形状の三次元形状データを生成し、この再建するモデルの表面形状の三次元形状データと前記欠損側乳房の表面形状の三次元形状データから乳房再建モデル全体の三次元形状データを生成する再建モデル形状データ生成手段と
を有することを特徴とする乳房再建モデル形状データ作成装置。 A breast reconstruction model shape data creation device for creating a breast reconstruction model of a subject in which one of a pair of breasts is missing based on the three-dimensional shape data of a healthy breast that is not missing,
a) Surface composed of m × n (m and n are integers greater than or equal to 3) grids located on the surface of the healthy breast based on the three-dimensional shape data of the healthy breast Healthy-side surface point cloud position information generating means for generating point cloud position information;
b) Healthy side peripheral point group position information extracting means for extracting position information of a plurality of peripheral point groups located at the peripheral part of the healthy side breast among the surface point group of the healthy side breast;
c) Points that connect the peripheral points of the healthy breast with a line segment, obtain a reference bottom surface that is a surface defined by the line segment, and are arranged in m × n grids located on the reference bottom surface Healthy side reference point group position information generating means for generating position information of a reference point group consisting of:
d) Based on the position information of the reference point group of the healthy breast and the position information of the surface point group corresponding to the point group, the point of the reference point group is the starting point, and the position is corresponding to the point of the starting point. Vector data generating means for generating vector data with the point of the surface point group as an end point;
e) Finding the inverted surface point group position information obtained by reversing left and right about the midline from the position information of the surface point group of the healthy breast, and the three-dimensional of the inverted surface point group position information and the surface shape of the defective breast A defect side that generates position information of a surface point group composed of m × n grid-shaped points located in a reconstruction target area corresponding to the reconstruction basic area on the surface of the defect side breast from shape data Breast surface point cloud position information generating means;
f) Defect side breast peripheral point group position information extracting means for extracting position information of a plurality of peripheral point groups located at the periphery of the reconstruction target area of the defective side breast from the positional information of the surface point group of the defective side breast When,
g) Connecting the peripheral points of the defective breast to each other with a line segment, obtaining a reference bottom surface that is a surface defined by the line segment, and m × n corresponding to the surface point group located on the reference bottom surface A deficient breast reference point group information generating means for generating position information of a reference point group consisting of points arranged in a grid pattern;
h) Inverted vector generating means for generating inverted vector data obtained by horizontally inverting the vector data about a median line;
i) generating three-dimensional shape data of the surface shape of the breast reconstruction model to be reconstructed on the defect side breast based on the positional information of the reference point group of the defect side breast and the inverted vector data; Breast reconstruction model shape data generation comprising: three-dimensional shape data and reconstruction model shape data generation means for generating three-dimensional shape data of the entire breast reconstruction model from the three-dimensional shape data of the surface shape of the defective breast apparatus.
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