The work of the group in this area commenced in the 1980s, resulting in the SR250 normalised organ dose datasets. A front-end MS-DOS program was supplied at the time for the scanners modelled in SR250, however subsequently the ImPACT group (formerly at St George's Hospital) developed an Excel package that enabled interactive dose estimations, and also to apply the calculator to other, newer, scanner models by allowing the ability to match newer scanner models to the existing modelled scanners. The SR250 normalised organ dose datasets are still widely used and are freely available to download.

ImPACT CT Patient Dosimetry Calculator

Version 1.0.4 27/05/2011

• Utilises NRPB SR250 MC generated normalised organ dose co-efficients (free)
• ImPACT calculator. First created ~ 2002
• Instructions for adding own scanner
• Practical tips: Castellano et al Radiation Protection Dosimetry 2005 : "CT Dosimetry: Getting the best from the adult Cristy phantom"