摘要:
目的:通过尝试直接降低管电压的方法控制辐射剂量,并评价图像质量,探讨其临床应用价值。方法:前瞻性选取2013年9月~2014年7月拟行头颈CTA检查的患者40例,并满足入组条件。患者分为A、B两组。A组患者采用低管电压设置,B组患者采用常规管电压设置。评价两组患者双侧颈动脉客观图像质量(包括CT值、SNR与CNR)与主观图像质量、辐射剂量。P<0.05认为差异具有统计学意义。结果:A组SNR为11.39±3.80,B组总SNR为12.48±4.48,t=-1.660,P=0.099,差异无统计学意义。A组总对CNR为10.12±3.55,B组总CNR为10.44±4.14,t=-0.485,P=0.628,差异无统计学意义。A、B两组可评估率比较差异无统计学意义(χ2=1.013,P=0.314)。A组有效剂量为2.29mSv±0.12mSv,B组有效剂量为6.69mSv±0.31mSv,t=-59.756,P=0.000,差异具有统计学意义。结论:通过降低管电压至80kV行头颈CTA扫描可以大幅度减低辐射剂量,而图像质量无明显影响,可以进行初步临床应用。
Abstract:
Objective: The purpose of this prospective study was to compare with image quality and radiation dose between low voltage and conventional head and neck CTA protocols. Methods: 40 consecutive patients were prospectively enrolled From September 2013 to July 2013, and satisfy the following conditions. Patients in group A was with low tube voltage settings, patients in group B was with traditional tube voltage settings. Two groups were evaluated for image quality, mean attenuation, noise, signal-to-noise ratio(SNR) and contrast-to-noise(CNR) in carotid artery and radiation dose. A P value below 0.05 was considered to be statistically significant. Results: The mean attenuation, noise, SNR and CNR was no statistically significant for group A versus group B(P > 0.05). The percentage of assessable coronary artery segments was no statistically significant for group B versus group A(χ2= 1.013, P = 0.314). The mean effective dose was statistically significant for the group A was 2.29 m Sv versus 6.69 m Sv for the group B(t =-59.756, P = 0.000). Conclusion Low tube voltage for head and neck CTA technique could offer assessable image quality and substantially reduced effective radiation dose.
百度学术
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