The application of four-dimensional cone-beam CT in radiotherapy for lung cancer

Radiotherapy is an indispensable treatment of lung cancer. However, movement of lung cancer brings challenges to precise radiotherapy. Four-dimensional cone-beam CT is a four-dimensional imaging technique, which can demonstrate the tumor trajectory to improve the accuracy of radiotherapy. In this article, the research status and development tendency of four-dimensional cone-beam CT in terms of measuring and correcting set-up errors, observing variability of tumor position and movement, guiding delineation of target volumes as well as calculating radiation dose were retrospectively reviewed. (authors)