WO2016056632A1 - 血管治療評価システム、そのコンピュータソフトウエアプログラム及び方法 - Google Patents
血管治療評価システム、そのコンピュータソフトウエアプログラム及び方法 Download PDFInfo
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- 206010053649 Vascular rupture Diseases 0.000 description 1
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Definitions
- the present invention relates to a system for evaluating the risk of vascular treatment, a computer software program thereof, and a method thereof, and more particularly, the risk of vascular rupture or postoperative after coil embolization which is one of the treatment methods for cerebral aneurysm
- the present invention relates to a system for evaluating the quality of a computer, its computer software program and method.
- coil embolization has been performed as one of the treatment methods for cerebral aneurysms.
- This coil embolization is a method of reducing the blood flow in the aneurysm and making it thrombotic by filling the aneurysm with a plurality of coils made of platinum or the like. By this method, blood flow into the aneurysm is blocked by thrombosis of the entire aneurysm, thereby preventing aneurysm rupture.
- the volume of the filling coil should be 20-30% with respect to the volume of the cerebral aneurysm.
- the coil is compressed toward the apex of the aneurysm (coil). compaction), re-increase of the remaining part (neck remant growth) occurred, and the thrombosis tended to be insufficient.
- the present invention has been made in response to such a problem.Overviewing the above problems, the risk of coil embolization is reduced, that is, the risk of aneurysm rupture, the necessity of treatment itself, the amount of coil, etc. It seeks to provide a system, computer software program and method for supporting treatment in judgment.
- a system for evaluating blood flow treatment based on a medical image a blood flow information calculation unit for calculating blood flow information in a specific blood vessel to be treated
- a system including a blood vessel treatment risk determination unit that calculates a risk factor related to blood vessel treatment for the treatment target blood vessel based on the calculated blood flow information, and a display unit that displays the risk factor to a user is provided.
- a risk factor for coil embolization of an aneurysm can be calculated from blood flow information such as a blood flow obtained from a medical image and presented to the user.
- the blood flow information calculation unit calculates a blood flow rate that flows into the specific blood vessel to be treated as a lith factor.
- the blood flow information calculation unit calculates a ratio of the blood flow amount flowing from the parent blood vessel into the aneurysm as a risk factor before the blood vessel treatment.
- the vascular treatment risk determination unit may further determine an increase risk / rupture risk of the aneurysm before treatment based on a ratio of a blood flow rate flowing into the aneurysm as the risk factor. desirable.
- the determination of the increase risk / rupture risk is determined based on the classification of the ratio of the blood flow rate flowing into the aneurysm that has increased or not increased in the past.
- the vascular treatment risk determination unit calculates a ratio between a blood flow rate flowing into the aneurysm from a parent vessel before vascular treatment and a blood flow rate flowing into the aneurysm after vascular treatment. It is calculated as a risk factor indicating the quality of vascular treatment.
- the determination of the quality of the vascular treatment may be determined based on the classification of the flow rate ratio in the case where re-treatment is necessary after treatment and the flow rate ratio in the case where re-treatment is not necessary. preferable. Furthermore, in this case, when the latter is 200% or more of the former as the flow rate ratio before and after treatment, it is desirable to determine that the result of vascular treatment is not good.
- the vascular treatment is coil embolization for an aneurysm.
- the present invention is not limited to this, and for example, clipping and balloon stents may be filled.
- a computer software program for performing a blood flow simulation based on a medical image to support treatment of a disease related to a blood vessel, wherein the computer is a specific treatment target. Calculating blood flow information in a blood vessel; calculating a risk factor related to blood vessel treatment for the blood vessel to be treated based on the calculated blood flow information; and displaying the calculation result to a user.
- a computer software program for executing the system is provided.
- a method comprising the steps of: calculating a risk factor related to vascular treatment for the treatment target blood vessel based on the calculated blood flow information; and displaying the calculation result to a user.
- FIG. 1 a is a view showing a state of an aneurysm immediately after coil embolization.
- FIG. 1 b is a view showing a state of aneurysm one year after coil embolization.
- FIG. 2 is a schematic system configuration diagram showing an embodiment of the present invention.
- FIG. 3 is a flowchart of channel shape construction in one embodiment.
- FIG. 4 is a flowchart of blood flow analysis in one embodiment.
- FIG. 5 is a diagram showing the flow rate of blood in blood vessels and aneurysms with flow lines.
- FIG. 6 is a reference diagram for defining the neck surface of the cerebral aneurysm.
- FIG. 7 a is a view showing a remaining portion in the aneurysm immediately after the coil embolization operation.
- FIG. 7 b is a diagram showing a reopening portion in the aneurysm one year after the coil embolization operation.
- FIG. 8 is a diagram showing the inflow coefficient in one embodiment of the present invention.
- FIG. 9 is a table summarizing the relationship between the inflow coefficient and the grade.
- FIG. 10 is a table summarizing the data with respect to the volume of the knob.
- FIG. 2 is a schematic system configuration diagram of the blood flow analysis device 1 according to the present invention.
- the blood flow analysis apparatus 1 is configured by connecting a program storage unit 6 and a data storage unit 7 to a bus 5 to which a CPU 2, a memory 3 and an input / output unit 4 are connected.
- the program storage unit 6 includes an input unit 8, a blood flow analysis execution unit 9, a blood flow information calculation unit 10, and a vascular treatment risk determination unit 11.
- the blood flow information calculation unit 10 includes a blood flow information extraction unit 12 and a blood flow information display unit 13, and the blood vessel treatment risk determination unit 11 includes a blood flow information determination unit 14 and a risk information display unit 15.
- the data storage unit 7 stores a medical image 16, a calculation condition template 17, a pass / fail determination template 18, blood flow information 19, and risk information 20.
- the components (8 to 20) are actually constituted by computer software stored in a storage area of a hard disk, and are called by the CPU 2 and expanded on the memory 3 and executed. It is configured and functions as a component.
- the input unit 8 receives the medical image 16, the fluid property 25, the boundary condition 26, and the calculation condition 27 from the data storage unit 7.
- the medical image 16 is an MRI image or the like.
- the fluid physical properties 25 are density and viscosity in this embodiment.
- the boundary condition 26 is a flow velocity / pressure distribution on the end face of each pipeline and a constraint condition on the wall surface. In this embodiment, the velocity is set to zero (non-slip condition) by ignoring the flow velocity distribution at the inlet and outlet of the pipeline and the fluid slip on the wall surface.
- the calculation condition 27 is generation of a calculation grid for a given flow path shape, and is an equation discretization and simultaneous equation solution for equation solution.
- the blood flow analysis execution unit 9 acquires a pressure field / flow velocity field based on the medical image 16 read by the input unit 8. As shown in FIG. 4, the blood flow analysis execution unit 9 first receives a medical image 16 (a). Next, a blood vessel shape (surface mesh) is extracted based on the received medical image (b), a calculation grid (volume mesh) is generated (c), and the fluid physical property 25 and the boundary condition (wall surface) input at the input unit 8 ) 26 is set, and (d), the flow rate and flow pressure at the inlet and outlet of the blood flow are set (e). Based on this set flow rate and pressure, the equation is iteratively calculated (f) to obtain the pressure field / velocity field (g). If it solves it, it will become the pressure field and the velocity field in space and time.
- FIG. 5 is a diagram visualizing the flow line of the blood flow based on the acquired pressure field / flow velocity field, and the magnitude of the flow velocity is expressed using colors. For example, a low flow rate is gradually displayed from blue through a gradation of light blue, green, yellow, orange, etc., and a high flow rate is displayed in red.
- green, yellow, and red lines are drawn in the portion indicated by A
- B is substantially light blue and green
- C is substantially green
- D is red and yellow.
- the flow velocity is visualized based on the color so that E and F are substantially composed of a red line.
- D is near the entrance to the aneurysm, but it can be seen from the state that the streamline extends into the aneurysm, so that blood flow is flowing into the aneurysm.
- the blood flow information calculation unit 10 calculates an inflow amount of blood, that is, an inflow coefficient, which is one of the intra-aneurysm state quantities, based on the pressure field / flow velocity field 28 obtained by the blood flow analysis execution unit 9. is there.
- FIG. 6 is a schematic diagram for explaining the calculation of the inflow coefficient.
- 51 is a knob and 54 is a blood vessel.
- the center of gravity G59 of the neck surface 52 is determined, and the intra-lumen vertical direction unit vector 57 extending in the vertical direction 58 is extracted therefrom. Then, by taking the inner product of the vertical unit vector 58 in the aneurysm and the velocity vector in the neck surface 52 calculated based on the pressure field / velocity field, the velocity substantially flowing into the aneurysm 51 is calculated. . This speed is zero when integrated over the entire surface because the inflow and outflow are the same. Therefore, either the inflow amount or the outflow amount may be referred to, but only the inflow amount is referred to here. This inflow amount is calculated by adding only positive flow rates when the streamline heading in the vertical direction in the aneurysm is positive.
- the inflow coefficient is 0.07, that is, 7%, and it can be seen that 7% of the parent blood vessel flow rate flows into the aneurysm.
- the blood vessel treatment risk determination unit 11 reads the pass / fail determination template 18 stored in the data storage unit 7 and collates the inflow coefficient into the blood mass calculated by the blood flow information calculation unit 10 with the pass / fail determination template 18. Thus, the possibility of increasing aneurysm or re-operation (risk) is determined.
- this vascular treatment risk determination unit has an inflow coefficient of 0 to 0.22 for grade A, 0.23 to 0.42 for grade B, and 0.43 to 0.2. Up to 7 is judged as grade C. This determination is made, for example, based on accumulated data of the increase and non-increase of the aneurysm. In this example, in FIG.
- the risk information display unit 15 displays an evaluation result in which there is almost no risk in grade A, attention is required in grade B, and high risk in grade C.
- FIG. 10 is a diagram in which the data of the inflow coefficient calculated by the blood flow information calculation unit 10 are summarized with respect to the volume of the aneurysm.
- the inflow coefficient is increased even within a volume of 50 mm 3 . That is, the volume alone is not sufficient as a risk factor.
- inflow calculations range from a minimum of 0.1 or less to a maximum of about 0.6. As a result, it was proved that the fluid characteristics could not be evaluated only by the shape of the aneurysm, and it was shown that the evaluation by the flow rate count according to the present invention is effective.
- a numerical value comparing the case where re-operation was required after coil embolization and the case where it was not is also prepared in advance, and the computer calculates the quality of the operation after coil embolization with reference to this template.
- This numerical value is set to 200% or more in this embodiment.
- This is a numerical value verified in a comparison between cases where re-operation was required after coil embolization and cases where re-operation was necessary, and in cases where re-operation was necessary, the relative blood flow entering the cerebral aneurysm was approximately doubled.
- FIGS. 7a and 7b are MRI images of cases where reopening occurred immediately after coil embolization and one year later, respectively. Comparing the state of the aneurysm immediately after the treatment and one year later, it can be seen that the remaining part and the blood inflow part at the resuming part coincide.
- the inflow amount of the blood flow was calculated in the blood flow information calculation unit, the result that the inflow coefficient reached 62% in this case was calculated. That is, since an inflow coefficient of 62% flows into the aneurysm from the same inflow portion, it is demonstrated that the risk of increased flow can be verified immediately after the operation by examining the inflow coefficient immediately after the operation. It was.
- the present inventors are related to blood flow in the cerebral aneurysm, and because the blood clot is induced by the decrease in blood flow, We paid attention to the problem that should be dealt with in terms of blood flow rather than shape. That is, as described above, the blood flow is not evaluated no matter how much the risk factor is evaluated by the shape factors such as the volume of the aneurysm, the neck length, and the filling rate as in the conventional case.
- the present inventors focused on the flow rate of blood flowing into the cerebral aneurysm, and calculated the ratio of the blood flow flowing through the parent blood vessel and the blood flow entering the aneurysm as an inflow coefficient. As a result of this calculation, the present inventors have obtained knowledge that the risk of aneurysm increase and aneurysm rupture can be predicted, and the present invention has been completed.
- the present invention has the effect of being able to support coil embolization from multiple aspects.
- the blood flow information for the blood vessel treatment is the blood flow rate
- the risk factor is the flow rate ratio, but is not limited thereto.
- the blood flow information may be an amount representing the state of blood flowing in the cerebral aneurysm, and may be, for example, a flow velocity, energy, or pressure.
- the vascular treatment is coil embolization, but is not limited thereto.
- clipping and balloon stent filling may be used.
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Abstract
Description
このような構成によれば、医用画像から得られる血流量等の血流情報から、例えば瘤へのコイル塞栓術に対するリスクファクタを算出して、それをユーザに提示することができる。
図2は、本願発明に係る血流解析装置1の概略システム構成図である。この血流解析装置1は、CPU2、メモリ3及び入出力部4が接続されたバス5に、プログラム格納部6とデータ格納部7とが接続されてなる。プログラム格納部6は、入力部8と、血流解析実行部9と、血流情報算出部10と、血管治療リスク判定部11とを備えている。前記血流情報算出部10は血流情報抽出部12および血流情報表示部13を有し、前記血管治療リスク判定部11は、血流情報判定部14およびリスク情報表示部15を有する。データ格納部7には、医用画像16と、演算条件テンプレート17と、良否判断テンプレート18と、血流情報19と、リスク情報20とが格納されている。
入力部8はデータ格納部7から医用画像16、流体物性25、境界条件26、計算条件27を受け取るものである。医用画像16はMRI画像等である。また、流体物性25は、この実施形態においては密度と粘度である。境界条件26は、各管路の端面における流速・圧力分布、および、壁面における拘束条件である。この実施形態では、管路の入口や出口における流速分布、壁面での流体の滑りを無視することで速度をゼロと設定する(ノンスリップ条件)。計算条件27は、与えられた流路形状に対しての計算格子生成であり、方程式解法に関する方程式離散化、連立方程式解法である。
血流解析実行部9は、入力部8で読み取られた医用画像16を基に圧力場・流速場を取得するものである。この血流解析実行部9は、図4に示されるように、まず医用画像16受け取る(a)。次に受け取った医用画像を基に血管形状(サーフェスメッシュ)を抽出し(b)、計算格子(ボリュームメッシュ)を生成し(c)、入力部8で入力された流体物性25と境界条件(壁面)26を設定し、(d)、血流の入口と出口における流量と流圧を設定する(e)。この設定された流量と圧力を基に、方程式を反復演算することで(f)、圧力場・流速場を取得するものである(g)が、この圧力場・流速場は、時間発展型として解法すれば時空間での圧力場・流速場となる。
血流情報算出部10は、上記血流解析実行部9で求めた圧力場・流速場28に基づいて、瘤内状態量の一つである血液の流入量、すなわち流入係数を算出するものである。図6は、この流入係数の算出を説明するための模式図である。図6において、51は瘤であり、54が血管である。そして、この51と54の境目である、瘤51のネック部53にある平面をネック面52と呼ぶ。
血管治療リスク判定部11は、データ格納部7に格納された前記良否判断テンプレート18を読み出し、上記血流情報算出部10で算出された血液の瘤への流入係数をこの良否判断テンプレート18に照合して瘤の増大もしくは再手術の可能性(リスク)を判定するものである。この実施形態では、図9に示すように、この血管治療リスク判定部は、流入係数が0~0.22はグレードA、0.23~0.42まではグレードB、0.43~0.7まではグレードCというように判定する。この判定は、例えば、瘤の増大と非増大の蓄積データに基づいて決定されるものであり、この例では、図10において、流入係数が0~0.22までは瘤が増大したケースは見られないためグレードAとし、0.23~0.42までは、増大したケースとしなかったケースが混在するため、グレードB、そして、0.43以上においては増大したケースが100%であるため、グレードCとするものである。この判定に基づいて、リスク情報表示部15がグレードAではリスクはほぼない、グレードBでは注意が必要であり、グレードCでは高リスクとなるような評価結果を表示するものである。
Claims (27)
- 医用画像に基づいて血管治療を評価するためのシステムであって、
特定の治療対象血管における血流情報を算出する血流情報算出部と、
前記算出した血流情報に基づいて前記治療対象血管に対する血管治療に関するリスクファクタを算出する血管治療リスク判定部と、
上記算出されたリスクファクタをユーザに表示する表示部と
を有するシステム。 - 請求項1に記載のシステムにおいて、
前記血流情報算出部は前記特定の治療対象血管に流れ込む血液流量をリスファクタとして演算するものである
ことを特徴とするシステム。 - 請求項2に記載のシステムにおいて、
前記特定の治療対象血管は瘤であり、
前記血流情報算出部は、血管の本流から前記瘤に流入する血流量の割合を血管治療前のリスクファクタとして演算するものである
ことを特徴とするシステム。 - 請求項3記載のシステムにおいて、
前記血管治療リスク判定部は、前記リスクファクタとしての瘤に流入する血流量の割合に基づいて、治療前に、この瘤の増大リスク/破裂リスクを判定するものである
ことを特徴とするシステム。 - 請求項4記載のシステムにおいて、
増大リスク/破裂リスクの判定は、過去の増大・非増大となった瘤に流入する血流量の割合の分類に基づいて決定されるものである
ことを特徴とするシステム。 - 請求項2に記載のシステムにおいて、
前記特定の治療対象血管は瘤であり、
前記血管治療リスク判定部は、血管治療前に親血管から前記瘤に流入する血流量と、血管治療後に前記瘤に流入する血流量の比率を血管治療の良否を示すリスクファクタとして演算するものである
ことを特徴とするシステム。 - 請求項6記載のシステムにおいて、
前記血管治療の良否の判定は、治療後に再治療が必要となったケースの前記流量比率と、再治療が必要でなかったケースの前記流量比率の分類に基づいて決定されるものである
ことを特徴とするシステム。 - 請求項7記載のシステムにおいて、
前記血管治療リスク判定部は、
治療前と治療後の前記流量比率として、後者が前者の200%以上となった場合に、血管治療の結果は良好でないと判定するものである
ことを特徴とするシステム。 - 請求項1のシステムであって、
前記血管治療は、瘤に対するコイル塞栓術である
ことを特徴とするシステム。 - 医用画像に基づいて血管治療を評価するためのコンピュータソフトウエアプログラムであって、以下の工程;
コンピュータが、特定の治療対象血管における血流情報を算出する工程と、
前記算出した血流情報に基づいて前記治療対象血管に対する血管治療に関するリスクファクタを算出する工程と、
上記算出されたリスクファクタをユーザに表示する工程と
を実行させる命令を含む
ことを特徴とするコンピュータソフトウエアプログラム。 - 請求項10に記載のコンピュータソフトウエアプログラムにおいて、
前記特定の治療対象血管における血流情報を算出する工程は前記特定の治療対象血管に流れ込む血液流量をリスファクタとして演算するものである
ことを特徴とするコンピュータソフトウエアプログラム。 - 請求項11に記載のコンピュータソフトウエアプログラムにおいて、
前記特定の治療対象血管は瘤であり、
前記特定の治療対象血管における血流情報を算出する工程は、血管の本流から前記瘤に流入する血流量の割合を血管治療前のリスクファクタとして演算するものである
ことを特徴とするコンピュータソフトウエアプログラム。 - 請求項12記載のコンピュータソフトウエアプログラムにおいて、
前記算出した血流情報に基づいて前記治療対象血管に対する血管治療に関するリスクファクタを算出する工程は、前記リスクファクタとしての瘤に流入する血流量の割合に基づいて、治療前に、この瘤の増大リスク/破裂リスクを判定するものである
ことを特徴とするコンピュータソフトウエアプログラム。 - 請求項13記載のコンピュータソフトウエアプログラムにおいて、
増大リスク/破裂リスクの判定は、過去の増大・非増大となった瘤に流入する血流量の割合の分類に基づいて決定されるものである
ことを特徴とするコンピュータソフトウエアプログラム。 - 請求項11に記載のコンピュータソフトウエアプログラムにおいて、
前記特定の治療対象血管は瘤であり、
前記算出した血流情報に基づいて前記治療対象血管に対する血管治療に関するリスクファクタを算出する工程は、血管治療前に親血管から前記瘤に流入する血流量と、血管治療後に前記瘤に流入する血流量の比率を血管治療の良否を示すリスクファクタとして演算するものである
ことを特徴とするコンピュータソフトウエアプログラム。 - 請求項15記載のコンピュータソフトウエアプログラムにおいて、
前記血管治療の良否の判定は、治療後に再治療が必要となったケースの前記流量比率と、再治療が必要でなかったケースの前記流量比率の分類に基づいて決定されるものである
ことを特徴とするコンピュータソフトウエアプログラム。 - 請求項16記載のコンピュータソフトウエアプログラムにおいて、
前記算出した血流情報に基づいて前記治療対象血管に対する血管治療に関するリスクファクタを算出する工程は、
治療前と治療後の前記流量比率として、後者が前者の200%以上となった場合に、血管治療の結果は良好でないと判定するものである
ことを特徴とするコンピュータソフトウエアプログラム。 - 請求項10のコンピュータソフトウエアプログラムであって、
前記血管治療は、瘤に対するコイル塞栓術である
ことを特徴とするコンピュータソフトウエアプログラム。 - 医用画像に基づいて血管治療を評価するための方法であって、
特定の治療対象血管における血流情報を算出するステップと、
前記算出した血流情報に基づいて前記治療対象血管に対する血管治療に関するリスクファクタを算出するステップと、
上記算出されたリスクファクタをユーザに表示するステップと
を有する方法。 - 請求項19に記載の方法において、
前記特定の治療対象血管における血流情報を算出するステップは前記特定の治療対象血管に流れ込む血液流量をリスファクタとして演算するものである
ことを特徴とする方法。 - 請求項20に記載の方法において、
前記特定の治療対象血管は瘤であり、
前記特定の治療対象血管における血流情報を算出するステップは、血管の本流から前記瘤に流入する血流量の割合を血管治療前のリスクファクタとして演算するものである
ことを特徴とする方法。 - 請求項21記載の方法において、
前記算出した血流情報に基づいて前記治療対象血管に対する血管治療に関するリスクファクタを算出するステップは、前記リスクファクタとしての瘤に流入する血流量の割合に基づいて、治療前に、この瘤の増大リスク/破裂リスクを判定するものである
ことを特徴とする方法。 - 請求項22記載の方法において、
増大リスク/破裂リスクの判定は、過去の増大・非増大となった瘤に流入する血流量の割合の分類に基づいて決定されるものである
ことを特徴とする方法。 - 請求項20に記載の方法において、
前記特定の治療対象血管は瘤であり、
前記算出した血流情報に基づいて前記治療対象血管に対する血管治療に関するリスクファクタを算出するステップは、血管治療前に親血管から前記瘤に流入する血流量と、血管治療後に前記瘤に流入する血流量の比率を血管治療の良否を示すリスクファクタとして演算するものである
ことを特徴とする方法。 - 請求項24記載のシステムにおいて、
前記血管治療の良否の判定は、治療後に再治療が必要となったケースの前記流量比率と、再治療が必要でなかったケースの前記流量比率の分類に基づいて決定されるものである
ことを特徴とする方法。 - 請求項25記載の方法において、
前記算出した血流情報に基づいて前記治療対象血管に対する血管治療に関するリスクファクタを算出するステップは、
治療前と治療後の前記流量比率として、後者が前者の200%以上となった場合に、血管治療の結果は良好でないと判定するものである
ことを特徴とする方法。 - 請求項19の方法であって、
前記血管治療は、瘤に対するコイル塞栓術である
ことを特徴とする方法。
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