Comparative Study of Low Dose and Normal Dose Spiral CT Scan in Pulmonary Sarcoidosis Screening

Objective To evaluate the value of low dose spiral CT scan via the comparative research of low dose and normal dose spiral CT scan in the pulmonary sarcoidosis screening.Methods A total of 40 cases with pulmonary nodule were received spiral CT scan with normal-dose scan(160 mAs,pitch 1.0,thickness 5 mm) and low-dose scan(40 mAs,pitch 2.0,thickness 5 mm).The magnitude,size and details(leaf,glitches,pleural indentation,calcification,pulmonary cavity and air bronchogram) of pulmonary sarcoidosis were analyzed by double blind method.Results There is no distinct difference in detection and details of pulmonary nodule screening between low dose scan and normal dose scan.But CTDlw of low-dose scan was 2.9 mGy and only accounted for 12.4% of normal-dose scan.Conclusion The detection effect of low-dose spiral CT scan is similar to normal-dose scan in pulmonary sarcoidosis screening,thus it can be applied to lung cancer screening among high risk group.