Objective To determine patient factors that affect over-scanning in low-dose CT(LDCT)for lung cancer screening.Methods A total of 467 patients who underwent LDCT in the Radiology Department of the First People's Hospital of Linping District from October 30 to December 3,2022,were retrospectively collected to evaluate the effects of age,gender and BMI on the length of over-scanning from above thoracic inlet to lung base.Results There were 319 cases(68.3％)with over-scanning of lung apices,and only 148 cases(31.7％)with optimized scanning;239 cases(51.1％)with lung base over-scanning,and 228 cases(49.9％)with optimized scanning.Among them,male patients had a significantly higher proportion of over-scanning in lung apices than female patients(P＜0.001).Number of over-scanning of lung apices in patients with BMI≥24 kg/m2 was significantly increased(P＜0.01).Other patients showed no statistical differences in lung apices and base over-scanning(all P＞0.05).Conclusion Chest LDCT scanning exceeding the anatomic range is common,and it is of guiding values to understand patient factors(age,sex,and body type)and the degree of influence in reducing exposure dose individually.
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