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通过呼吸信号引导管道电流调制进行序列扫描4DCT成像中的剂量减少:可行性研究

Annette Schwarz^1,2, René Werner^3,4, Lukas Wimmert^3,4

¹Pattern Recognition Lab, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.

Medical physics

|October 13, 2023

概括

智能4DCT (i4DCT) 使用剂量调节来减少患者在呼吸信号引导扫描期间的辐射暴露. 这种方法显示了降低剂量的可行性,同时保持了用于图像重建的投影数据覆盖范围.

科学领域:

医疗成像医学成像
辐射物理学辐射物理学
计算成像技术的成像

背景情况:

智能4DCT (i4DCT) 比传统4DCT提高了图像质量,特别是在不规则的呼吸模式下.
i4DCT优化了扫描,通过选择光束时段来确保每个沙发位置的数据充足.
目前的i4DCT方法导致冗余数据,并且由于长时间的呼气阶段,患者剂量增加.

研究的目的:

建议和评估i4DCT的呼吸信号导向剂量调节的可行性.
通过暂时降低CT管电流来降低i4DCT的成像剂量.
为了保持高投影数据覆盖,对于准确的图像重建至关重要.

主要方法:

使用510个临床4D CT呼吸曲线进行了一项in-silico可行性研究.
剂量调节标准是根据患者的呼吸信号定义的,包括下调和上调规则.
评估重点是剂量减少和调制对相位特异幅度容器 (受损容器) 的影响.

主要成果:

通过默认剂量调节参数实现了10.4%的中位数剂量减少.
对图像重建产生影响的损坏,发生在1.0%的光束周期和10.6%的呼吸曲线中.
剂量调节的程度取决于个体的呼吸模式,与呼吸周期的长度微弱相关.

结论:

呼吸信号导向剂量调节是i4DCT的一个可行的技术.
这种方法可以显著降低成像剂量,对投影数据覆盖率的影响最小.
需要进一步调查,以评估对整体图像质量的影响.

关键词:

4D CT CT 在 4D CT 中.降低剂量减少剂量

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