CT画像を用いたCOPD(Chronic Obstructive Pulumonary Disease)診断において気管支壁の計測は重要な役割を果たす.COPDは気管支壁の厚さが変化する疾患であり,その診断における気管支壁の計測はCT画像の各CTスライスに対して医師が手動で行う.しかし正確な診断のためには3次元CT画像上で壁を計測することがましい.また気管支は気管支壁となる領域(外壁)と気管支内部の空気領域(内壁)により構成されており,計測を行うためにはこれらを判別する必要がある.そこで本研究では,内壁と外壁の同定が可能な手法を提案した.特に梅床3次元胸部CT画像での計測においては,外壁の周辺に血管等の計測対象外の構造物が存在するため,その判別を行うことを考慮した計測手法を提案し,ファントムデータを用いて提案手法の精度を検討した.%Evaluating airway wall is an important factor for diagnosis of COPD(Chronic Obstructive Pulumonary Disease) by use of CT (computed tomography) images. COPD is a disease that changes airway wall thickness, and a diagnosis with evaluating airway wall for it is carried out by a doctor manually by use of each two-dimensional CT slice image. However, we consider the three-dimensional evaluation of airway wall thickness is more effective for accurate COPD diagnosis. And that airway wall is consisted of two factors; one is airway wall area (outer wall area) and the other is inside area (inner wall area). So we must detect outer wall area and inner wall area to evaluate them automatically. In this paper, we propose a method for analyzing air area (inner wall area) and wall area (outer wall area). Especially, there are unwanted objects like vessels around the outer wall in clinical three dimensional thoracic CT images. So we propose a evaluating method to analyze them and checked a method by use of phantom data.
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