Clinical value of 64 slice spiral CT low dose chest scan in diagnosis of pulmonary tuberculosis

Objective To investigate the clinical value of 64 slice spiral CT low dose chest scan in the diagnosis of pulmonary tuberculosis. Methods From January 2015 to January 2016, 45 patients with suspected pulmonary tuberculosis were studied.All patients underwent routine chest CT scan and low dose chest CT scan.To compare the difference of radiation dose related parameters between normal dose chest CT scanning and low dose chest CT scan.To observe the display of the characteristics of lung disease by routine dose chest CT scanning and low dose chest CT scan. Results In 45 patients, there were a total of 30 patients were diagnosed with tuberculosis.The diagnostic sensitivity, specificity and diagnostic coincidence rate of conventional CT scan and spiral CT low-dose scan were 93.3% and 86.7% respectively.In low dose CT scanning radiation dose related parameters, the effective dose [(1.36±0.22)mSv vs.(5.24±0.68) mSv], CT dose index[(31.8±3.7) vs.(51.2±6.3)] and dose length product[(35.4±5.4)mGycm vs.(137.9±26.1) mGycm]were significantly lower than those of the conventional dose CT scan, the differences were statistically significant (all P<0.05). Conventional dose and low dose CT scan could show the lung lesions of pulmonary tuberculosis.Comparison between the two groups, low dose CT scanning on the burr sign and grinding glass shadow display rate was low.Compared with the conventional dose CT scanning, the difference was statistically significant (P<0.05). Conclusion In the diagnosis of pulmonary tuberculosis, the radiation dose of 64 slice spiral CT is significantly decreased, be able to clear most of the lung lesions.However, the effect is poor in the display of the grinding glass and the thin and short burr. Key words: Tuberculosis, pulmonary; Tomography, spiral computed; Radiation dosage