CAJ | 학술논문

提出了一种基于形态学的 OVH 描述子计算方法，并评估了其在 IMRT 计划检索方面的性能。首先，将靶区与危及器官之间的最小距离和最大距离分别作为靶区收缩／扩张的起始点和终止点，并根据此最小距离和最大距离确定收缩／扩张的合适步长；然后，利用形态学膨胀／腐蚀原理对病例的计算机断层扫描数据进行处理，完成 OVH 描述子的有效计算；最后，以 OVH 曲线之间的面积为度量尺度，利用28个鼻咽癌病例评价了基于 OVH 描述子的 IMRT 计划检索的性能。实验结果表明，该方法能够有效准确地计算出 OVH 描述子，利用 OVH 描述子能够有效检索出形状相似度较高的病例。
제출료일충기우형태학적 OVH 묘술자계산방법，병평고료기재 IMRT 계화검색방면적성능。수선，장파구여위급기관지간적최소거리화최대거리분별작위파구수축／확장적기시점화종지점，병근거차최소거리화최대거리학정수축／확장적합괄보장；연후，이용형태학팽창／부식원리대병례적계산궤단층소묘수거진행처리，완성 OVH 묘술자적유효계산；최후，이 OVH 곡선지간적면적위도량척도，이용28개비인암병례평개료기우 OVH 묘술자적 IMRT 계화검색적성능。실험결과표명，해방법능구유효준학지계산출 OVH 묘술자，이용 OVH 묘술자능구유효검색출형상상사도교고적병례。
A calculation method for the overlap volume histogram(OVH)descriptor based on mor-phology is proposed,and its performance in intensity modulated radiation therapy (IMRT)plan re-trieval is evaluated.First,the minimum distance and the maximum distance between the target and or-gans at risk are taken as the start point and the end point of contraction/expansion operation,respec-tively,and the suitable step of contraction/expansion operation is determined according to the mini-mum distance and the maximum distance.Then,the principle of morphology dilation/erosion is em-ployed to process the computer tomography (CT)data of cases and compute the OVH descriptor ef-fectively.Finally,28 nasopharyngeal carcinoma (NPC)cases are employed to evaluate the retrieval performance of IMRT plan with the area between OVH curves being taken as the similarity measure-ment.The experimental results show that the proposed method can calculate the OVH descriptor effec-tively,and the OVH descriptor can be effectively used to retrieval the IMRT cases with high similarity.