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使用有效直径电子密度估计CT扫描的尺寸特定剂量估计 (SSDE) 的估计

Khuloud Almuqbil¹, Abdullah Abuhaimed², Ahmed Abanomy¹

¹Radiological Sciences Department, College of Applied Medical Sciences, King Saud University, P.O. Box 145111, Riyadh 4545, Saudi Arabia.

European journal of radiology

|January 24, 2024

概括

使用电子密度 (D_eff^ρe) 的有效直径为CT扫描中估计患者大小提供了一个有希望的替代方案,特别是在胸部协议中. 与传统方法相比,这种方法提供了更准确的尺寸特定剂量估计 (SSDE),当水等值直径 (D_w) 不可能实现时.

科学领域:

医学物理医学物理
放射性成像学成像学
辐射剂量计辐射剂量计

背景情况:

估计患者体型对于CT扫描中精确的体型特异剂量估计 (SSDE) 至关重要.
传统的水相当直径 (D_w) 估计面临着挑战.
提出了一种使用基于电子密度 (D_eff^ρe) 的有效直径的新方法.

研究的目的:

在不同患者大小和CT协议的两种形式中研究D_eff^ρe方法.
将D_eff^ρe方法与用于估计SSDE患者大小的常规方法进行比较.

主要方法:

在6种不同的CT体检方案中对350名患者进行了回顾性分析.
评估D_w,常规有效直径 (D_eff),D_eff,LAT+AP^ρe,和D_eff,LAT^ρe使用内部MATLAB代码.
基于绝对百分比差异 (PD) 值的估计准确性的比较.

主要成果:

与D_eff,LAT+AP^ρe和D_eff,LAT^ρe相比,D_eff (9-15%PD) 的胸部协议 (3-7%PD) 的估计结果更好.
D_eff为其他身体协议 (2-4% PD) 提供了比D_eff方法更好的估计.
纠正LAT和AP维度并没有提高D_eff^ρe的准确性;仅LAT纠正通常就足够了.

结论:

当D_w评估不可能时,可以考虑D_eff,LAT^ρe进行胸部协议.
D_eff方法适用于所有地区,对胸部协议有潜在的校正因子,以防止误估剂量.
准确的患者体型估计对于优化CT成像中的辐射剂量至关重要.

关键词:

有效直径 (D ((eff)))电子密度有效直径 () 电子密度有效直径 ()尺寸特定的剂量估计 (SSDE)侧面 (LAT) 和前后 (AP) 的尺寸.容量计算机断层扫描剂量指数 (CTDI ((vol))))水当量的直径 (D(w))

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