Article citationsMore>>

Mampuya, W.A., Nakamura, M., Matsuo, Y., Ueki, N., Fujimoto, T., Yano, S., Monzen, H., Minozaki, H. and Hiraoka, M. (2013) Interfraction Variation in Lung Tumor Position with Abdominal Compression during Stereotactic Body Radiotherapy. Medical Physics, 40, Article ID: 091718.
http://dx.doi.org/10.1118/1.4819940

has been cited by the following article:

• TITLE: Markerless Respiratory Motion Tracking Using Single Depth Camera

  AUTHORS: Shinobu Kumagai, Ryohei Uemura, Toru Ishibashi, Susumu Nakabayashi, Norikazu Arai, Takenori Kobayashi, Jun’ichi Kotoku

  KEYWORDS: Depth Camera, Markerless, Motion Tracking, Intra-Fractional Motion, Three-Dimensional Surface

  JOURNAL NAME: Open Journal of Medical Imaging, Vol.6 No.1, March 25, 2016

  ABSTRACT: The aim of this study is to propose a novel system that has an ability to detect intra-fractional motion during radiotherapy treatment in real-time using three-dimensional surface taken by a depth camera, Microsoft Kinect v1. Our approach introduces three new aspects for three-dimensional surface tracking in radiotherapy treatment. The first aspect is a new algorithm for noise reduction of depth values. Ueda’s algorithm was implemented and enabling a fast least square regression of depth values. The second aspect is an application for detection of patient’s motion at multiple points in thracoabdominal regions. The third aspect is an estimation of three-dimensional surface from multiple depth values. For evaluation of noise reduction by Ueda’s algorithm, two respiratory patterns are measured by the Kinect as well as a laser range meter. The resulting cross correlation coefficients between the laser range meter and the Kinect were 0.982 for abdominal respiration and 0.995 for breath holding. Moreover, the mean cross correlation coefficients between the signals of our system and the signals of Anzai with respect to participant’s respiratory motion were 0.90 for thoracic respiration and 0.93 for abdominal respiration, respectively. These results proved that the performance of the developed system was comparable to existing motion monitoring devices. Reconstruction of three-dimensional surface also enabled us to detect the irregular motion and breathing arrest by comparing the averaged depth with predefined threshold values.