Here are some reliable sources that can provide more information on CT scan.
Radiology Information, presented by the Radiological Society of North America (RSNA) and American College of Radiology (ACR):
- CT Scanning of the Abdomen:http://www.radiologyinfo.org/content/ct-abdomen.htm
- Blood vessels:http://www.radiologyinfo.org/content/CT-angiography.htm
Imaginis: Computed Tomography Imaging http://www.imaginis.com/ct-scan/