Low dose MSCT in PPD positive population screening for pulmonary tuberculosis feasibility study
Objective To investigate the low dose MSCT in PPD positive people, the value of screening for pulmonary tuberculosis. Methods 156 cases of PPD positive patients with pulmonary tuberculosis were 16 row spiral CT chest scans, first use the device default conditions were routine scan : a scanning voltage is 120KV, current 250mA, thickness of 7.5mm, pitch 1.375 : 1, speed ( mm / rot ) 27.50, the scanning range from the apex to the double rib diaphragm angle. Were randomly divided into three groups in the region of the lesion were treated with conventional dose, 50mA, 30mA, 20mA scanning, the scanning conditions and conventional scanning completely consistent, on a workstation for conventional scanning and a variety of low dose scanning pulmonary tuberculosis CT value standard deviation, the value of the noise and the entrance surface dose using the paired t test method were statistical y compared analysis. Results In pulmonary tuberculosis CT imaging display, conventional dose scanning and low dose group in 50mA, 30mA showed no statistical difference ( P > 0.05 ), but 20mA group a weight larger patient image noise significantly increased, affecting the pulmonary tuberculosis showed, compared with conventional dose and low dose group compared to 50mA, 30mA there was statistical y significant difference ( P < 0.05 ). Conventional dose group and 50mA, 30mA, 20mA and low dose group of entrance surface dose were 13.4mGy, 2.72 mGy, 1.63 mGy, 1.09 mGy, low dose group than in conventional dose group were decreased by 79.7%, 87.9%, and 91.8%. Conclusions 30mA of thorax low dose CT scan can completely replace conventional doses of CT were PPD positive population tuberculosis screening.
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