在一般X射线机器中使用基于硬币的方法评估自动曝光控制系统的可重复性
Thunyarat Chusin1, Ratima Wongchai1, Sararat Moonkham1
1Department of Radiological Technology, Faculty of Allied Health Sciences, Naresuan University, Phitsanulok, 65000, Thailand.
Radiological physics and technology
|October 2, 2025
概括
一般X射线机器的自动曝光控制 (AEC) 系统表现一致. 西门子和DRGEM系统都符合国际可重现性标准,确保诊断成像的可靠辐射剂量.
科学领域:
- 医学成像物理 医学成像物理
- 辐射技术 辐射技术
背景情况:
- 自动曝光控制 (AEC) 在数字放射学中对于优化辐射剂量和图像质量至关重要.
- 确保AEC系统的可重复性对于一致的诊断结果至关重要.
研究的目的:
- 在不同操作条件下评估AEC系统在一般X射线机器中的可重复性.
- 评估不同参数 (如管电压,灵敏度和物体厚度) 对AEC性能的影响.
主要方法:
- 在SIEMENS Multix Top和DRGEM GXR-40S系统上使用堆叠的硬币幻影测试了AEC可重复性.
- 在不同的灵敏度设置,管电压和物体厚度上进行了多次曝光.
- 使用曼-惠特尼U测试计算和统计分析了mAs值和变化系数 (CV).
主要成果:
- mAs值因管电压,灵敏度和物体厚度而异,但仍在可接受的诊断范围内.
- 在较低的管电压下观察到更高的mAs值,在较低的灵敏度设置下观察到更厚的幻影.
- 这两种系统的CV值都低于国际标准的5.00% (SIEMENS最大CV值为2.60%,DRGEM最大CV值为3.37%).
结论:
- 评估的AEC系统具有很高的可重现性,符合国际标准.
- 在各种测试条件下证实了AEC系统的一致性能,确保了可靠的辐射传递.
- 这些发现支持AEC在一般放射学中的临床可靠性,以保持图像质量和剂量效率.
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