低剂量与标准剂量螺旋CT发现肺结节的观察比较

Comparison Between the Low-dose and Standard-dose Helical CT for the Evaluation of Pulmonary Nodules

目的:比较低剂量与标准剂量螺旋CT在肺结节的发现与X线剂量之间的关系。方法:对30例患肺转移瘤患者均作了低剂量和标准剂量的螺旋CT。记录两者发现肺结节的数量,并按大小分成四个级别:<5,5-6.9,7-9.9,≥10 mm。最后,分析各自所发现结节的数量。结果:30例患者共发现结节635个,低剂量螺旋CT(LDCT)发现573(90.42％)个,标准剂量螺旋CT(SDCT)发现594(93.54％)个,两者共同发现532(83.78％)个。只SDCT发现而LDCT未发现的62(9.76％)个,只LDCT发现而SDCT未发现的41(6.46％)个,两者没有明显统计学差异。结论:LDCT可以用来发现或排除肺结节和作胸外恶性肿瘤的随访观察。

Objective: To investigate the finding and dose relation between the low dose and standard dose helical CT for the evaluation of pulmonary nodules. Methods:30 patients with pulmonary metastatic tumor were underdone CT examination at both standard-dose CT ( SDCT) and low-dose CT ( LDCT) . The number of nodules detected at each protocol was recorded. The size was measured electronically and categorized as <5 , 5-6.9,7-9.9,≥10mm. Finally, the nodules detected at only LDCT and SDCT were analyzed. Results: In 30 patients, number of all nodules was 635.594 (93.54% ) nodules were detected at SDCT. 573 (90.24% ) nodules were observed at LDCT. 532 (83.78% ) nodules were observed at both techniques. 62 (9.76% ) nodules were seen only at SDCT and 41 (6. 46% ) nodules were detected only at LDCT. There were no statistically significant differences. Conclusion: LDCT may be used to detect or exclude pulmonary nodules and may be followed up of patients with extrathoracic malignant tumors.