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目的探讨高千伏技术在计算机X线摄影(CR)中对被检者X线吸收剂量及图像质量的影响。方法将32例被检者以随机化原则分为对照组与研究组,每组各16例。对照组采用一般千伏技术(60～80kV)摄影,研究组采用高千伏技术(120kV)摄影。使用ToshibaDCW-20AX线机和KodakDirectViewCR975系统对被检者进行胸部摄影,用热释光剂量计测量被检者X线吸收剂量。由甲乙两名高年资放射科医师采用盲法对获得的CR图像质量以5分制作为等级评分标准进行评分,≥3分的图像被认为临床可接受,能够满足诊断要求。结果研究组X线吸收剂量为(0.22±0.03)mGy,对照组吸收剂量为(0.63±0.18)mGy(P<0.05);医师甲对研究组和对照组图像质量等级评分为3.88±0.50和4.19±0.54(P>0.05),医师乙对研究组和对照组图像质量等级评分为3.81±0.54和4.12±0.62(P>0.05)。结论与一般千伏技术比较,高千伏技术具有低辐射剂量及高分辨率的优点,因此在CR检查中使被检者X线吸收剂量明显降低,且图像质量能够满足诊断要求。
Objective To investigate the effects of high kV technology on X-ray absorption dose and image quality in computerized radiography (CR). Methods Thirty-two subjects were divided into control group and study group according to the principle of randomization, with 16 cases in each group. The control group used general kV technology (60 ~ 80kV) photography, the research group used high kV technology (120kV) photography. The subjects were underwent chest photography using a ToshibaDCW-20AX line machine and a KodakDirectViewCR975 system, and the subject’s X-ray absorption dose was measured by a thermoluminescence dosimeter. Two high-grade radiosurgeons from Class A and B were blindly scored on a 5-point scale to obtain CR image quality. Images with ≥3 points were considered clinically acceptable and could meet the diagnostic requirements. Results The X-ray absorption dose was (0.22 ± 0.03) mGy in the study group and (0.63 ± 0.18) mGy in the control group (P <0.05). Physician A rated the image quality grade of the study group and the control group as 3.88 ± 0.50 and 4.19 ± 0.54 (P> 0.05). Physician B rated the image quality grades of the study group and the control group as 3.81 ± 0.54 and 4.12 ± 0.62, respectively (P> 0.05). Conclusion Compared with the general kV technology, the high kV technology has the advantages of low radiation dose and high resolution. Therefore, the X-ray absorption dose of the examinee is obviously reduced in the CR examination, and the image quality can meet the diagnosis requirement.