title: A portable software tool for computing digitally reconstructed radiographs.
abstract: OBJECTIVE
  To develop a portable software tool for fast computation of digitally reconstructed radiographs (DRR) with a friendly user interface and versatile image format and display options. To provide a means for interfacing with commercial and custom three-dimensional (3D) treatment planning systems. To make the tool freely available to the Radiation Oncology community.
  
  
  METHODS
  A computer program for computing DRRs was enhanced with new features and rewritten to increase computational efficiency. A graphical user interface was added to improve ease of data input and DRR display. Installer, programmer, and user manuals were written, and installation test data sets were developed. The code conforms to the specifications of the Cooperative Working Group (CWG) of the National Cancer Institute (NCI) Contract on Radiotherapy Treatment Planning Tools.
  
  
  RESULTS
  The interface allows the user to select DRR input data and image formats primarily by point-and-click mouse operations. Digitally reconstructed radiograph formats are predefined by configuration files that specify 19 calculation parameters. Enhancements include improved contrast resolution for visualizing surgical clips, an extended source model to stimulate the penumbra region in a computed port film, and the ability to easily modify the CT numbers of objects contoured on the planning computed tomography (CT) scans.
  
  
  CONCLUSIONS
  The DRR tool can be used with 3D planning systems that lack this functionality, or perhaps improve the quality and functionality of existing DRR software. The tool can be interfaced to 3D planning systems that run on most modern graphics workstations, and can also function as a stand-alone program.
authors.affiliation: Department of Radiation Oncology, University of North Carolina, Chapel Hill 27599-7512, USA.
authors.forename: E L
authors.initials: EL
authors.lastname: Chaney
authors.forename: J S
authors.initials: JS
authors.lastname: Thorn
authors.forename: G
authors.initials: G
authors.lastname: Tracton
authors.forename: T
authors.initials: T
authors.lastname: Cullip
authors.forename: J G
authors.initials: JG
authors.lastname: Rosenman
authors.forename: J E
authors.initials: JE
authors.lastname: Tepper
mesh_terms: D011856:Radiographic Image Enhancement; D012984:Software; D018581:Technology Transfer; D014584:User-Computer Interface