Introduction Xun Jia and Steve B. Jiang Digitally Reconstructed Radiographs Michael M. Folkerts Analytic Cone-Beam CT Reconstructions Bongyong Song, Wooseok Nam, Justin C. Park, and William Y. Song Iterative Cone-Beam CT Reconstruction on GPUs: A Computational Perspective Wei Xu, Ziyi Zheng, Eric Papenhausen, Sungsoo Ha, and Klaus Mueller 4DCT and 4D Cone-Beam CT Reconstruction Using Temporal Regularizations Hao Gao, Minghao Guo, Ruijiang Li, and Lei Xing Multi-GPU Cone-Beam CT Reconstruction Hao Yan and Xiaoyu Wang Tumor Tracking and Real-Time Volumetric Imaging via One Cone-Beam CT Projection Ruijiang Li and Steve B. Jiang GPU Denoising for Computed Tomography Andreas Maier and Rebecca Fahrig GPU-Based Unimodal Deformable Image Registration in Radiation Therapy Sanjiv S. Samant, Soyoung Lee, and Sonja S.A. Samant Inter-Modality Deformable Registration Yifei Lou and Allen Tannenbaum CT-to-Cone-Beam CT Deformable Registration Xin Zhen and Xuejun Gu Reconstruction in Positron Emission Tomography Franck P. Vidal and Jean-Marie Rocchisani Implementation of Convolution Superposition Methods on a GPU Todd R. McNutt and Robert A. Jacques Photon and Proton Pencil Beam Dose Calculation Xuejun Gu Photon Monte Carlo Dose Calculation Sami Hissoiny Monte Carlo Dose Calculations for Proton Therapy Xun Jia Treatment Plan Optimization for Intensity-Modulated Radiation Therapy (IMRT) Chunhua Men Treatment Plan Optimization for Volumetric-Modulated Arc Therapy (VMAT) Fei Peng, Zhen Tian, H. Edwin Romeijn, and Chunhua Men Non-Voxel-Based Broad Beam Framework: A Summary Weiguo Lu and Mingli Chen Gamma Index CalculationsXuejun Gu SCORE System for Online Adaptive Radiotherapy Zhen Tian, Quentin Gautier, Xuejun Gu, Chunhua Men, Fei Peng, Masoud Zarepisheh, Yan Jiang Graves, Andres Uribe-Sanchez, Xun Jia, and Steve B. Jiang TARGET: A GPU-Based Patient-Specific Quality Assurance System for Radiation Therapy Yan Jiang Graves, Michael M. Folkerts, Zhen Tian, Quentin Gautier, Xuejun Gu, Xun Jia, and Steve B. Jiang