Body Size-Specific Organ and Effective Doses of Chest CT Screening Examinations of the National Lung Screening Trial.

Objective: We calculated body size-specific organ and effective doses for 23,734 participants in the National Lung Screening Trial (NLST) using a CT dose calculator.

Materials And Methods: We collected participant-specific technical parameters of 23,734 participants who underwent CT in the clinical trial. For each participant, we calculated two sets of organ doses using two methods.

Effective dose assessment for participants in the National Lung Screening Trial undergoing posteroanterior chest radiographic examinations.

Objective: The National Lung Screening Trial (NLST) is a multicenter randomized controlled trial comparing low-dose helical CT with chest radiography in the screening of older current and former heavy smokers for early detection of lung cancer. Recruitment was launched in September 2002 and ended in April 2004, when 53,454 participants had been randomized at 33 screening sites. The objective of this study was to determine the effective radiation dose associated with individual chest radiographic screening examinations.

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.