允许在6秒内进行圆束计算机断层扫描的新技术:对比图像质量的患者研究
James L Robar1, Amanda Cherpak1, Robert Lee MacDonald1
1Department of Radiation Oncology, QE2 Cancer Centre, Nova Scotia Health, Halifax, Canada; Departments of Radiation Oncology; Physics and Atmospheric Science, Dalhousie University, Halifax, Canada.
Practical radiation oncology
|November 8, 2023
概括
新的HyperSight (Varian Medical Systems) 圆束CT系统提供了快速6秒的成像,减少了文物,可与CT模拟器质量相提并论. 这种先进的成像适合适应性放射治疗工作流程.
科学领域:
- 医疗成像医学成像
- 放射治疗 物理 物理
- 图像重建算法 图像重建算法
背景情况:
- 圆束计算断层扫描 (CBCT) 对于图像导向辐射疗法至关重要.
- 提高CBCT图像质量,特别是减少文物和提高统一性,是一个持续的挑战.
- 新的重建算法和快速获取是提高CBCT性能的关键.
研究的目的:
- 为了评估新的HyperSight CBCT平台的图像质量.
- 将HyperSight的图像质量与标准CBCT和风扇束CT (FBCT) 进行比较.
- 评估HyperSight对于适应性放射治疗工作流程的适用性.
主要方法:
- 一项临床研究涉及30名接受各种胸部和腹部瘤放射治疗的患者.
- 获取四个图像集:标准CBCT (TrueBeam),FBCT (CTsim) 和HyperSight CBCT在呼吸保持 (HSBH) 和自由呼吸 (HSFB) 模式.
- 使用文物指数,图像均性,对比度,对比度和噪声比率以及Hounsfield单位 (HU) 差异进行定量比较.
主要成果:
- 与标准的CBCT和自由呼吸HyperSight相比,HyperSight呼吸暂停 (HSBH) 显示显著减少了人工物.
- HSBH图像统一性优于自由呼吸HyperSight,与CT模拟器 (CTsim) FBCT相比.
- 虽然CTsim具有更高的对比度,但HSBH和HSFB都显示出比标准CBCT更高的对比度和噪声比率. 关键组织类型的中位数HU与CTsim的差异在15HU以内.
结论:
- 超视系统提供快速的6秒CBCT采集与图像工件相似的CTsim FBCT.
- 在同一个平台上,HyperSight 屏住呼吸的成像效果高于自由呼吸的成像效果.
- 在HyperSight呼吸持久成像中HU值的准确性支持其在适应性放射治疗中用于直接剂量计算.
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