Nuclear Medicine & Radiation Therapy

K. Sakata

Publications

• Research Article
  Evaluation of Non-Rigid Image-Registration Algorithms Using Discrepancy Distance Between Organ Contours
  Author(s): Y. Saito, K. Tateoka, K. Shima, T. Nakazawa, A. Nakata, T.Abe, M. Yano, K. Fujimoto, M. Someya, K. Nakata, M. Hori, M.Hareyama and K. SakataY. Saito, K. Tateoka, K. Shima, T. Nakazawa, A. Nakata, T.Abe, M. Yano, K. Fujimoto, M. Someya, K. Nakata, M. Hori, M.Hareyama and K. Sakata
  
  Purpose: Non-rigid image registration (NIR) is useful for adaptive radiotherapy. However, no method has been established for evaluating the quality of the algorithms used in NIR. To remedy this situation, we demonstrate herein a novel method to evaluate NIR algorithms. Methods: We define the NIR error as the discrepancy distance between (i) the organ contours obtained from computed tomography (CT) images acquired during the treatment period (reference contours) and (ii) the contours obtained from the treatment-planning CT images that are constructed by automated propagation during the treatment period (evaluation contours). However, the continuous positional relationship between the points where the reference contour intersects the evaluation contour is assumed to be maintained. In addition, we adapt the proposed method so that it can be applied to the contours of complex organs such .. Read More»
  DOI: 10.4172/2155-9619.1000307

  Abstract PDF