头部石屏蔽 - 计算机断层扫描 - 仍然是必要的吗?
Jana Di Rosso1, Andreas Krasser2, Sebastian Tschauner1
1Division of Paediatric Radiology, Department of Radiology, Medical University of Graz, 8036 Graz, Austria.
Journal of clinical medicine
|January 11, 2024
概括
石屏蔽显著降低了儿童部CT扫描期间的眼镜辐射剂量. 将石屏蔽与AEC和OBTCM等其他技术相结合,进一步提高了剂量降低,尽管它可能会增加轨道图像噪声,这种噪声可以通过泡来减轻.
科学领域:
- 辐射物理学 辐射物理学
- 医学成像医学成像
- 辐射保护 辐射保护 辐射保护
背景情况:
- 部CT扫描使放射敏感眼镜暴露在辐射中,对儿童构成更大的风险.
- 目前的指导方针 (IRCP 2021) 在大多数领域都不鼓励患者使用接触屏蔽.
- 这项研究研究了甲屏蔽 (BS) 的持续效用及其与其他剂量降低技术的结合.
研究的目的:
- 为了评估石屏蔽 (BS) 在减少眼镜辐射剂量的有效性,在儿科脑部CT.
- 评估将BS与自动暴露控制 (AEC) 以及其他剂量降低方法相结合的影响.
- 分析BS和阻隔泡对轨道和头骨区域图像质量的影响.
主要方法:
- 在两个MDCT扫描仪上用于头骨CT扫描的儿科人类形象幻影.
- 使用热发光剂量计测量眼镜的剂量.
- 评估了BS对图像质量的影响,带有和没有阻隔泡.
主要成果:
- 在这两种扫描仪上,BS显著降低了眼镜镜片剂量 (GE: 41.50%,西门子:29.75%).
- 与AEC结合进一步降低了剂量 (GE: 60.75%,西门子: 41.25%).
- 通过BS + AEC + OBTCM实现的最大剂量减少 (GE: 71.25%,西门子:58.75%). BS增加了轨道图像噪声,由泡减轻;形图像噪声不受影响.
结论:
- 石屏蔽有效地降低了儿童部CT眼镜的辐射剂量.
- 将BS与AEC和OBTCM结合起来,可以显著提高剂量降低.
- 虽然BS会增加轨道噪声,但Standoff泡可以减轻这种噪声,而不会影响头骨图像质量.
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