Cohen SL, et al. - The present study was sought to determine individual, technologist and CT factors that influence excess scan length for chest CT. Researchers conducted a retrospective evaluation of 1,118 consecutive noncontrast chest CT scans, over twelve consecutive months, for assessment of scan length above and below the lung parenchyma. In this multivariable analysis, the results displayed that high volume technologists, male individuals, and individuals younger than 65 had a greater amount of excess scan length and presence of excessive scanning above the lungs; high volume technologists and male individuals had a greater amount of excess scan length below the lungs, and high volume technologists and individuals older than 65 had greater presence of excessive scanning below the lungs, each p < 0.001. It was reported that excess scanning on chest CT is common, varies by individual age and gender and was significantly greater for high volume technologists.