This describes the trial, explaining how and what data were collected. A web tool for downloading CT images from NLST is described. Links to main trial publications, protocol documents, and external web resources can also be found here.

• Trial Summary
  This provides an overview of the study's protocol.
• Data Collected
  This includes details about protocols for questionnaires, screening, and ascertainment of cancer and mortality data.
• Images
  This page describes a web-based application for identifying subpopulations of interest within the NLST population and downloading the screening CT images from NLST (in DICOM format) as well as the associated data. Access is only available to users with an approved project proposal submitted through CDAS.
• Main Findings
  This page provides links to publications and web sites that summarize the main findings and the design of the study.