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Lung cancer is the most common disease of the 21st century endanger human health, the 5-year survival rates after surgical resection of early stage lung cancer can be as high as 90%, while in the late 5-year survival rate of less than 5%, early detection, early diagnosis, early treatment plays a vital role in the prognosis of patients has important clinical significance and the value of screening for lung cancer in high-risk populations. Annually worldwide detection of pulmonary nodules, malignant tumors account for 10% -70% range. Malignant lung nodules early lack of specificity, but has certain characteristics, this paper compare low dose scanning with conventional scanning radiation dose multislice spiral CT (MSCT) differences, the main study and explore lung nodule detection characteristics of lung nodules differences with the conventional dose scan. Selected patients with pulmonary nodules found in our hospital routine examination, keeping the other parameters unchanged line 30mA and 10mA low-dose scan, accept the differences of the radiation dose and found differences in the ability of the lung nodules observed in patients with different doses of scanning, and then select 36 interested in gold nodules, thin layer the standard algorithms and boneplus of algorithm retrospective reconstruction, is sent to the workstation software processing, such as VR and MPR reformatted images, to judge the different dose multislice spiral CT scan in the display characteristics of lung nodules differences, and calculate the volume of lung nodules. The results show acceptable dose of 30mA scan for 12.79% of 230mA and 10mA scan acceptable dose of only 4.26% of 230mA, received radiation doses significantly reduced (p <0.05); 230mA, 30mA, 10mA to scan of 7.5mm the original image found ≤ 5mm lung nodule no significant difference (p> 0.05), 230mA group and 30mA group reconstruction 1.25mm than 7.5mm image detection of lung nodules increased, but there was no difference (p> 0.05), 10mA group of 7.5mm and rebuild the 1.25mm the image detection of lung nodules differences (p <0.05), 7.5mm significantly better than 1.25mm image; 230mA group, 30mA, 10mA group in lung nodule volume calculation and display of pulmonary nodules characteristics evident difference (p> 0.05), pulmonary nodules analysis software can be applied to calculate the volume of pulmonary nodules significantly different (p <0.05), 230mA group 30mA was no significant difference (p> 0.05), 30mA, 10mA no significant difference (p> 0.05), 230mA, 10mA group significantly different (p <0.05). The low dose of multislice spiral CT scan 30mA and 10mA detection of pulmonary nodules and clearly show the characteristics of lung nodules, significantly reduce the radiation dose at the same time to meet the clinical requirements. Can accurately calculate the volume of lung nodules, 10mA scanning is not a substitute for 230mA. MSCT 30mA low-dose scan showed lesions observed characteristics of lung nodules observe nodule volume change before and after both lesions detected, but also qualitative analysis, as cancer patients radiotherapy and chemotherapy after the review, not qualitative lung periodic review of the nodules in patients with long-term smokers or people with chronic lung disease, and older than 40 years of regular screening for high-risk groups.
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