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胸脊柱的基架式形光束CT:与光子计数CT和能量整合CT的幻影比较
Ulf Bach1, Davide Cester1, Jonas Kroschke1
1Diagnostic and Interventional Radiology, University Hospital Zurich, University Zurich, Switzerland.
基于格兰特的形束CT (CBCT) 显示为脊柱成像有前途,在大部分脊柱的较低剂量下产生诊断质量. 然而,上胸部成像需要更高的辐射,整体图像质量仍然低于传统的CT方法.
科学领域:
- 医疗成像医学成像
- 放射学 放射学是一门学科.
- 计算机断层扫描 (CT) 是一种计算机断层扫描.
背景情况:
- 圆束CT (CBCT) 在脊柱成像方面存在局限性,原因是视野小.
- 基架式CBCT系统的进步为全面的脊柱成像提供了潜力.
研究的目的:
- 评估一种基于门架的多扫描CBCT系统,用于脊柱成像.
- 使用剂量匹配协议将CBCT性能与能量集成 (EI) CT和光子计数 (PC) CT进行比较.
主要方法:
- 用了一个人形的干幻影用于胸脊椎脊柱成像.
- 进行了基于通道的CBCT扫描,具有不同的预设 (低剂量,增强,最佳质量).
- 进行了定性 (利克尔特尺度) 和定量 (GNL) 图像分析,与剂量匹配的EICT和PCCT进行了比较.
主要成果:
- CBCT实现了胸部和腰椎的诊断图像质量,特别是通过增强/最佳质量的预设.
- 主观图像质量排名为PCCT > EICT > CBCT; CBCT显示的NLN低于EICT.
- 对于上胸部CBCT (Th1-Th6) 需要更高的剂量 (5 mGy),而较低的剂量 (0.5 mGy) 则足以治疗下脊椎 (Th7-S1).
结论:
- 基于Gantry的CBCT可以在幻影研究中以相对较低的剂量产生大脊柱区域的诊断质量的图像.
- 需要更高的辐射剂量来用CBCT对上胸脊柱 (Th6以上) 进行成像.
- 发现CBCT的整体主观图像质量低于EICT和PCCT.
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