@inproceedings{b5e5fc493ea24d1b8f6f13d750bc7d62,
title = "Fast generation of digitally reconstructed radiograph through an efficient preprocessing of ray attenuation values",
abstract = "Digitally reconstructed radiographs (DRR) are a simulation of radiographic images produced through a perspective projection of the three-dimensional (3D) image (volume) onto a two-dimensional (2D) image plane. The traditional method for the generation of DRRs, namely ray-casting, is a computationally intensive process and accounts for most of solution time in 3D/2D medical image registration frameworks, where a large number of DRRs is required. A few alternate methods for a faster DRR generation have been proposed, the most successful of which are based on the idea of pre-calculating the attenuation value of possible rays. Despite achieving good quality, these methods support a limited range of motion for the volume and entail long pre-calculation time. In this paper, we propose a new preprocessing procedure and data structure for the calculation of the ray attenuation values. This method supports all possible volume positions with practically small memory requirements in addition to reducing the complexity of the problem from O(n3) to O(n2). In our experiments, we generated DRRs of high quality in 63 milliseconds with a preprocessing time of 99.48 seconds and a memory size of 7.45 megabytes.",
keywords = "3D/2D registration, 3D/2D registration, attenuation fields, perspective projection, ray casting",
author = "Soheil Ghafurian and Metaxas, {Dimitris N.} and Virak Tan and Kang Li",
note = "Publisher Copyright: {\textcopyright} 2016 SPIE.; Medical Imaging 2016: Image-Guided Procedures, Robotic Interventions, and Modeling ; Conference date: 28-02-2016 Through 01-03-2016",
year = "2016",
doi = "10.1117/12.2217756",
language = "English (US)",
series = "Progress in Biomedical Optics and Imaging - Proceedings of SPIE",
publisher = "SPIE",
editor = "Webster, {Robert J.} and Yaniv, {Ziv R.}",
booktitle = "Medical Imaging 2016",
address = "United States",
}