一个深度学习模型用于将CT转化为通风成像:对功能回避放射治疗规划的准确性和影响的分析
Zhen Hou1, Youyong Kong2,3,4, Junxian Wu2
1The Comprehensive Cancer Centre of Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, 210000, Jiangsu, China.
Japanese journal of radiology
|March 27, 2024
概括
一个新的深度学习模型从计划CT扫描中生成合成肺透气图像 (CTVISyn). 这些合成图像有效地减少了肺癌患者的辐射诱导的肺毒性,与使用实际的4DCT衍生的通风图像相比.
科学领域:
- 医学成像医学成像
- 人工智能在瘤学中的应用
- 放射治疗规划 放射治疗规划
背景情况:
- 功能性肺成像有助于减少放射治疗期间的肺毒性.
- 自由呼吸的4DCT衍生的通风成像 (CTVI) 量化了肺功能.
- 准确的CTVI对于有效的功能性规避规划至关重要.
研究的目的:
- 开发和验证一个深度学习模型,直接从计划CT图像中生成合成CTVI (CTVISyn).
- 评估CTVISyn与来自4DCT (CTVI4DCT) 的CTVI相比的准确性.
- 评估CTVISyn指导的功能性规避计划对减少肺毒性和保持计划质量的影响.
主要方法:
- 一个基于3D U-Net的深度学习模型被训练,使用48名NSCLC患者的配对计划CT和4DCT扫描.
- CTVI4DCT作为基本真相,使用基于雅可比的算法生成.
- 使用斯皮尔曼相关性 (rs) 和子相似系数 (DSC) 验证了模型性能.
- 使用CTVI4DCT和CTVISyn创建了功能性避免计划,以节省高通风肺部区域的前50%的空气.
- 分析了剂量-体积组图 (DVH) 和剂量-功能组图 (DFH),并使用NTCP模型估计了辐射肺炎 (RP) 风险.
主要成果:
- CTVISyn与CTVI4DCT (平均rs=0.65) 显示出中等至高的相关性.
- 顶部通风范围 (50-60%) 的平均DSC值为0.41-0.52.
- 与临床计划相比,CTVI4DCT指导计划显著降低了RP风险 (29.24%与49.12%相比,P=0.016).
- 与CTVISyn指导的计划相比,CTVI4DCT指导的计划也显著降低了RP风险 (31.13%与49.12%,P=0.022),与CTVI4DCT指导的计划相比没有显著差异.
- 在CTVISyn和CTVI4DCT指导计划之间,DVH和DFH指标没有显著差异.
结论:
- 深度学习有效地产生合成CTVI从规划CT中等到高精度.
- 在降低肺毒性方面,CTVISyn指导的放射治疗规划与CTVI4DCT指导的规划相当.
- 这种方法保持了可接受的计划质量,并为改善肺癌患者放射治疗结果提供了有前途的方法.
- 需要进一步的前性试验来证实这些发现.
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