There are several sites which allow researchers to upload their (published) CT datasets for use by others. However, it sort of depends on what kind of data you are looking for.
For example: for datasets of geological materials, you may go to the Digital rocks portal (www.digitalrocksportal.org); for medical data, you may find some CT on http://medvis.org/datasets/ or through the visible human project (https://www.nlm.nih.gov/research/visible/getting_data.html).
Thiago Viana Miranda Lima Sir I want to CT database resources like image, dose parameter like mA,kvp etc. Are such website available? I want to analyse large CT data regarding dose distribution.
For such analysis I would say it is unlikely you will find. You can contact the companies that sell dose management softwares (like GE, Siemens, Bayer, Agfa, ...) to see if they have a test sample data they would share with you. Do you work/ study in a hospital? If so, you can collect these information over a period of time or perhaps query your local PACS.