摘要
目的 探讨智能最佳kV（CARE kV）技术在成人胸部CT成像的应用及其对降低辐射剂量的价值。方法 将69例患者按随机数字表法分成A、B两组，A组39例，行CARE kV技术扫描；B组30例，行标准120 kV技术扫描。比较两组CT剂量指数（CTDIvol）、剂量长度乘积（DLP）和有效剂量（E）以及分析A组管电压的选择与体重指数（BMI）关系。结果 A组平均CTDIvol（11.00±3.89）mGy、DLP（294.05±91.17）mGy·cm及E（4.12±1.28）mSv分别低于B组（16.64±1.20）mGy、（475.99±41.16）mGy·cm、（6.66±0.58）mSv（t=-7.653、-10.151、-10.150，P〈0.05），与B组比较，A组总体E降低了38.14%。A组实际使用电压范围80~140 kV，管电压的选择与患者BMI呈正相关（r=0.627，P〈0.05）。A组中非肥胖组患者E较肥胖组（BMI≥28 kg/m2）减少了31.74%（t=4.322，P〈0.05），而B组中非肥胖组患者E与肥胖组患者差异无统计学意义。结论 胸部CT成像中，CARE kV技术能够根据患者体型和解剖部位的不同而自动地选择管电压和调整管电流，从而能够在保证图像诊断质量的同时显著降低总体辐射剂量。
Objective To explore the application of CARE kV technique in the adult chest CT and the value of reducing radiation dose. Methods Sixty-nine patients were divided into two groups by random number generators： group A（39 cases） and group B（30 cases）. Group A was examined by using CARE kV technique and group B was examined at routine 120 kV. CT dose index（CTDIvol）, dose length product（DLP） and effective dose（E） were compared between the two groups, and analyzed the correlation between tube voltage selection and patient body mass index （BMI） of group A was analyzed. Results The average CTDIvol[（11.00±3.89） mGy], DLP[（294.05± 91.17） mGy·cm] and E[（4.12±1.28） mSv] of group A were lower than those of group B（16.64±1.20） mGy, [（475.99±41.16） mGy·cm], [（6.66±0.58） mSv]. With statistically significant difference （t=-7.653, -10.151, -10.150, P〈0.05）. Compared with routine 120 kV technique （group B）, the CARE kV technique （group A） could reduce the total radiation dose about 38.14%. Compared obese patients（BMI≥28 kg/m2） with non-obese patients in group A and B, the mean E of non-obese patients was lower than that of obese patients in group A, which reduced the total E about 31.74% （t=4.322, P〈0.05）, while E in group B was no significant different between non-obese patients and obese patients. Conclusions In adult chest CT, CARE kV technique can select optimum scanning voltage automatically according to the patients with different BMI and anatomical regions, which can reduce the overall radiation dose while maintaining image quality.
出处
《中华放射医学与防护杂志》
CAS
CSCD
北大核心
2013年第6期664-667,共4页
Chinese Journal of Radiological Medicine and Protection
