SU‐E‐J‐02: 4D Digital Tomosynthesis Based On Algebraic Image Reconstruction and Total‐Variation Minimization for the Improvement of Image Quality

Abstract

Purpose:In this paper, we implemented the four‐dimensional (4D) digital tomosynthesis (DTS) imaging based on algebraic image reconstruction technique and total‐variation minimization method in order to compensate the undersampled projection data and improve the image quality.Methods:The projection data were acquired as supposed the cone‐beam computed tomography system in linear accelerator by the Monte Carlo simulation and the in‐house 4D digital phantom generation program. We performed 4D DTS based upon simultaneous algebraic reconstruction technique (SART) among the iterative image reconstruction technique and total‐variation minimization method (TVMM). To verify the effectiveness of this reconstruction algorithm, we performed systematic simulation studies to investigate the imaging performance.Results:The 4D DTS algorithm based upon the SART and TVMM seems to give better results than that based upon the existing method, or filtered‐backprojection.Conclusion:The advanced image reconstruction algorithm for the 4D DTS would be useful to validate each intra‐fraction motion during radiation therapy. In addition, it will be possible to give advantage to real‐time imaging for the adaptive radiation therapy.This research was supported by Leading Foreign Research Institute Recruitment Program (Grant No.2009‐00420) and Basic Atomic Energy Research Institute (BAERI); (Grant No. 2009‐0078390) through the National Research Foundation of Korea(NRF) funded by the Ministry of Science, ICT & Future Planning (MSIP).