The following are links to Web sites that provide information on computed tomography (CT) for radiology professionals. To suggest a site for the list, send e-mail to [email protected].
ACR Standards for Computed Tomography
Lists standards, in downloadable PDF format, for CT and other radiology procedures, by the American College of Radiology.
Computed Tomography Library
NetMedicine's CT library offers CT images of various pathologies.
CTisus
Site dedicated to CT, by Dr. Elliott Fishman. Includes teaching files and spiral CT protocols.
CTSim
Open-source CT simulation software.
Division of Physiologic Imaging
University of Iowa site dedicated to quantitation and visualization of anatomic structure and function using volumetric image display and analysis of mostly CT data.
European Guidelines on Quality Criteria for Computed Tomography
Quality guidelines for reducing CT radiation exposure, produced by prominent European radiologists and physicists.
Imaginis.com
Site offers basic information on CT scanning, primarily targeted at patients.
Impact Scan.org
Independent-minded CT scanner evaluation center sponsored by the Medical Devices Agency of the UK's National Health Service. Services include device evaluations, educational programs, and research and publications on CT-related topics.
Introduction to Computed Tomography Practice Standards
Provides information on standards required for CT technologists. PDF produced by American Society of Radiologic Technologists.
National Cancer Institute
NCI’s fact sheet on CT, geared primarily toward patients.
Radiation Exposure in Computed Tomography
White paper in PDF format on CT radiation dose, produced by the European Coordination Committee of the Radiological and Electromedical Industries (COCIR).
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![Axial images from unenhanced calcium score cardiac CT (left) and curved planar reformation images from CT angiography (right) show that higher long-term exposure to air pollution is associated with greater coronary artery calcium and more obstructive coronary artery disease (CAD). Top row: Images in a 68-year-old male patient with higher 10-year mean ambient air pollution exposure (7.9 μg/m3 for particulate matter measuring ≤2.5 μm in diameter [PM2.5] and 17.4 parts per billion [ppb] for NO2) with extensive CAD (coronary artery calcium score [CACS] >1,000 and obstructive CAD [≥70% diameter stenosis]). Bottom row: Images in a 57-year-old female patient with lower 10-year mean ambient air pollution exposure (6.3 μg/m3 for PM2.5 and 4.6 ppb for NO2) with no CAD (CACS = 0 and no obstructive stenosis).](https://img.auntminnie.com/mindful/smg/workspaces/default/uploads/2026/06/hanneman.r6SMLzkezo.png?auto=format%2Ccompress&dpr=2&fit=crop&h=167&q=70&w=250)
