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目的探讨低辐射剂量CT扫描引导定位下肺部穿刺的技术成功率及安全性。方法 56例发现肺部占位需要穿刺明确诊断的患者,选择28例使用常规剂量扫描(120 k V,120 m As)CT引导,28例使用低剂量扫描(120 k V,30m As)引导,回顾性分析两组患者图像质量、容积CT剂量指数CTDIvol、剂量长度乘积DLP及比较两组穿刺的技术成功率及安全性。结果低剂量组CTDIvol和DLP分别为(2.01±0.33)m Gy,(46.73±3.68)m Gy·cm,显著低于常规剂量组的(7.03±0.36)m Gy,(126.41±4.81)m Gy·cm,差异有统计学意义。常规剂量扫描组穿刺成功率96.43%,低剂量扫描组穿刺成功率92.86%,两组成功率差别无统计学意义;两组在并发症发生率方面无显著差异。结论肺部低剂量CT扫描的图像质量可以满足CT引导定位的目的。肺部低剂量引导定位穿刺活检术,在降低了患者辐射剂量的同时还保证了穿刺的准确率。
Objective To explore the technical success rate and safety of lung puncture guided by low-dose CT scan. Methods Fifty-six patients who underwent lung biopsy with definite diagnosis of puncture were selected. Twenty-eight patients were guided by conventional CT scan (120 k V, 120 m As) and 28 patients were treated by low-dose scanning (120 k V, 30 m As) The image quality, volumetric CT dose index CTDIvol, dose length product DLP and the technical success rate and safety of the two groups of puncture were retrospectively analyzed. Results The CTDIvol and DLP in the low dose group were (2.01 ± 0.33) m Gy and (46.73 ± 3.68) m Gy · cm, respectively, which were significantly lower than those in the conventional dose group (7.03 ± 0.36) m Gy and (126.41 ± 4.81) m Gy · cm, the difference was statistically significant. The successful rate of puncture in conventional dose scanning group was 96.43%, and the successful rate of puncture in low dose scanning group was 92.86%. There was no significant difference in success rate between the two groups. There was no significant difference in the incidence of complications between the two groups. Conclusion The image quality of lung low dose CT scan can meet the purpose of CT guided positioning. Pulmonary low-dose guided positioning biopsy, reducing the patient’s radiation dose while also ensuring the accuracy of puncture.