Quantitative Imaging for Adaptive Radiation Therapy

Blocker Strips

On-board imaging can provide updated patient information at the treatment position thus can be potentially used for adaptive radiation therapy. On-board imaging are often degraded by various artifacts, which makes it challenging for  quantitative applications. We are interested in the development of quantitative imaging techniques for their applications in image-guided and adaptive radiation therapy. One of our recent research focuses is on the development and evaluation of a quantitative CBCT technique.

We developed a moving-blocker-based approach that is able to suppress the scatter-related artifacts, reduce the imaging dose, and simultaneously obtain complete volumetric information within the field of view using a single CBCT scan.

CBCT with scatter
CBCT with moving blocker
Fan-beam CT
  • J. Wang, W. Mao, and T. Solberg, " Scatter correction for cone-beam computed tomography using one-dimensional moving blocker strips: a preliminary study", Medical Physics, vol. 37, pp. 5792-5800, 2010.
  • L. Ouyang, K. Song, and J. Wang, "A moving blocker system for cone-beam computed tomography scatter correction", Medical Physics, vol. 40, pp. 071903, 2013
  • L. Ouyang, P. Lee, and J. Wang, "A moving-blocker-based strategy for simultaneous megavoltage and kilovoltage scatter correction in cone-beam computed tomography image acquired during volumetric modulated arc therapy", Radiotherapy and Oncology, to appear, 2015