Estimated radiation dose associated with low-dose chest CT of average-size participants in the National Lung Screening Trial.

Objective: The objective of our study was to determine the distribution of effective dose associated with a single low-dose CT chest examination of average-size participants in the National Lung Screening Trial. Organ doses were also investigated.

Materials And Methods: Thirty-three sites nationwide provided volume CT dose index (CTDI(vol)) data annually for the 97 MDCT scanners used to image 26,724 participants during the trial.

Normalized CT dose index of the CT scanners used in the National Lung Screening Trial.

Objective: The National Lung Screening Trial includes 33 participating institutions that performed 75,133 lung cancer screening CT examinations for 26,724 subjects during 2002-2007. For trial quality assurance reasons, CT radiation dose measurement data were collected from all MDCT scanners used in the trial.

Materials And Methods: A total of 247 measurements on 96 MDCT scanners were collected using a standard CT dose index (CTDI) measurement protocol.