Radiation dosimetry for wide-beam CT scanners: recommendations of a working party of the Institute of Physics and Engineering in Medicine

It is generally recognised that the CT dose index (CTDI) methodology developed for single-slice CT scanners [1] is flawed for wide-beam CT systems. In this commentary, the wide-beam CT dosimetry working party of the Institute of Physics and Engineering in Medicine (IPEM) appraises two alternatively published CT dosimetry protocols for wide-beam CT systems and presents its recommendations on the most practical method for wide-beam CT dosimetry in the UK.