计算机应用 ›› 2015, Vol. 35 ›› Issue (4): 1120-1123.DOI: 10.11772/j.issn.1001-9081.2015.04.1120

• 虚拟现实与数字媒体 • 上一篇    下一篇

基于弹性配准的肺4D-CT中间相位图像重建

耿丹丹, 王婷婷, 曹蕾, 张煜   

  1. 南方医科大学 生物医学工程学院, 广州 510000
  • 收稿日期:2014-10-20 修回日期:2015-01-07 出版日期:2015-04-10 发布日期:2015-04-08
  • 通讯作者: 张煜
  • 作者简介:耿丹丹(1991-),女,河南卫辉人,硕士研究生,主要研究方向:医学图像处理; 王婷婷(1990-),女,甘肃兰州人,硕士研究生,主要研究方向:医学图像处理; 曹蕾(1974-),女,湖南沅江人,副教授,主要研究方向:医学图像处理、软件工程; 张煜(1975-),男,江西南昌人,教授,主要研究方向:医学图像处理。
  • 基金资助:

    国家自然科学基金资助项目(31271067, 61102114);广东省自然科学基金资助项目(S2013010014049)。

Reconstruction of images at intermediate phases of lung 4D-CT data based on deformable registration

GENG Dandan, WANG Tingting, CAO Lei, ZHANG Yu   

  1. School of Biomedical Engineering, Southern Medical University, Guangzhou Guangdong 510000, China
  • Received:2014-10-20 Revised:2015-01-07 Online:2015-04-10 Published:2015-04-08

摘要:

针对肺四维计算机断层摄影(4D-CT)数据获取时辐射剂量高的缺点,提出了一种基于弹性配准的肺4D-CT中间相位图像重建方法,利用已知的两个特殊呼吸相位图像,重建出其他中间呼吸相位图像。其具体过程是:选择呼吸周期内的两个相位图像分别作为参考图像和浮动图像,首先用Active Demons配准方法估计出两个相位图像间的运动位移场;然后根据呼吸运动过程的线性假设,相应地求出浮动图像到中间相位图像的运动位移,继而重建出中间相位图像。实验结果表明,重建出的中间相位图像不仅在视觉上与真实图像非常接近,而且用标记点方法量化评价的平均误差也在3 mm内。所提基于弹性配准的重建方法能较准确地重建出肺4D-CT中间相位图像。

关键词: 肺四维计算机断层摄影, 图像重建, 呼吸运动, Active Demons配准方法

Abstract:

Due to the high radiation dose to the patient when acquiring lung four Dimensional Computed Tomography (4D-CT) data, this paper proposed a method for deriving the phase-binned 4D-CT image sets through deformable registration of the images acquired at some known phases. First, Active Demons registration algorithm was employed to estimate the motion field between inhale and exhale phases. Then, images at an intermediate phase were reconstructed by a linear interpolation of the deformation coefficients. The experiment results showed that the images at intermediate phases could be reconstructed efficiently. The quantitative analysis of landmark point displacements showed that 3 mm accuracy was achievable. The different maps of reconstructed and acquired images illustrated the similar level of success. The proposed method can accurately reconstruct images at intermediate phases of lung 4D-CT data.

Key words: lung four Dimensional Computed Tomography (4D-CT), image reconstruction, respiratory motion, Active Demons registration algorithm

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