呼吸导航器引导的多切片自由呼吸的心脏T1映射在磁共振引导的线性加速器上
Beau P Pontré1,2, Stefano Mandija2,3, Manon M N Aubert2
1University of Auckland, Department of Anatomy and Medical Imaging, Auckland, New Zealand.
Physics and imaging in radiation oncology
|April 10, 2025
概括
在磁共振引导的线性加速器 (MR-linac) 上,可以进行自由呼吸的心脏T1映射,用于非侵入性心脏放射性消毒. 这种技术在准心肌痕方面表现有前途,即使有可植入的心脏转心器除器.
科学领域:
- 医疗成像医学成像
- 辐射疗法 辐射疗法
- 心脏病学 心脏病学
背景情况:
- 心脏放射除是一种心律失常的非侵入性治疗方法,需要精确的目标识别.
- 基于加多的对比剂在高能辐射期间是一个问题,需要非对比成像替代品.
- 原生T1映射可以将心肌痕划定为治疗代用物,但必须考虑可植入心脏转换器除器 (ICD) 器件.
研究的目的:
- 在MR-linac上实施和验证由心电图 (ECG) 触发的自由呼吸心脏T1映射技术.
- 通过使用不同的读取方案,在ICD的存在下评估该技术的稳定性.
- 评估非对比T1映射的可行性,用于图像引导的心脏放射性废除.
主要方法:
- 一个ECG触发的,自由呼吸的心脏T1映射序列是在MR-linac上开发的,它包含了一个呼吸导航器.
- 该技术使用运动幻影得到验证,并在健康志愿者身上进行了测试.
- 坏的梯度回声和平衡的SSFP读取方案被用于ICD文物缓解.
主要成果:
- 自由呼吸T1映射方法在动作幻影中显示了5%的地面真相T1的一致性.
- 在健康的志愿者中,自由呼吸的T1映射显示了与喘息相比的平均差异为-3.5%,导航器数据影响了量化.
- 损坏的梯度回声读数比平衡的SSFP更容易受到ICD工件的影响,尽管信号减少影响了T1量化.
结论:
- 自由呼吸心脏T1映射在MR-linac上是可行的,以潜在地用于心脏放射性剥离.
- 需要进一步优化,以减少扫描时间并提高T1量化的准确性.
- 这种非对比的方法为准心肌律失常患者的心肌痕提供了一个有希望的替代方案,即使是使用ICD.
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