实用医学杂志 ›› 2023, Vol. 39 ›› Issue (1): 86-91.doi: 10.3969/j.issn.1006⁃5725.2023.01.015

• 临床研究 • 上一篇    下一篇

呼吸触发前瞻门控在早期非小细胞肺癌立体定向放射治疗中剂量学优势

钱涵 汪红艳 王凡    

  1. 安徽医科大学第一附属医院放疗科(合肥230022)

  • 出版日期:2023-01-10 发布日期:2023-01-10
  • 通讯作者: 王凡 E⁃mail:wangfan1965@126.com
  • 基金资助:
    安徽高校自然科学研究项目(编号:KJ2021A0303)

Dosimetric advantages of respiratory ⁃ triggered prospective gating in stereotactic body radiation therapy for early stage non⁃small⁃cell lung cancer 

QIAN Han,WANG Hongyan,WANG Fan   

  1. Department of Radiation Oncology,the First Affiliated Hospital of Anhui Medical University,Hefei 230022,China

  • Online:2023-01-10 Published:2023-01-10
  • Contact: WANG Fan E⁃mail:wangfan1965@126.com
  • Supported by:

摘要:

目的 探讨呼吸触发前瞻门控在早期非小细胞肺癌(NSCLC)立体定向放射治疗(SBRT)中 剂量学优势。方法 选取 21 例经病理证实的早期 NSCLC 患者,分别行自由呼吸下 3D⁃CT、4D⁃CT 电影模式 和呼气末前瞻性呼吸触发轴向⁃R 模式扫描,同等条件下分别设计前瞻门控(Planpro)、30% ~ 70%时相回顾 门控(Plan30⁃70)、运动包络法(Planall)及传统基于人群边际的 3D⁃CT(Plan3D)4 组无均整器模式容积旋转调 SBRT 计划。统计分析计划靶体积(PTV)、患侧肺和全肺的 V5、V20、V14.4、平均肺剂量(MLD)、全肺正常组 织并发症概率(NTCP)、心脏 Dmax、食管 Dmax、食管 NTCP、脊髓 Dmax和近端支气管树 Dmax等指标。结果 Planall Plan3D相比,除脊髓 Dmax的所有剂量学参数均下降差异有统计学意义(P < 0.05)。与 Planall相比,Planpro PTV、患侧肺 V5、V20、V14.4、MLD、全肺 V5、V20、V14.4、MLD、NTCP、心脏 Dmax和食管 NTCP Plan30⁃70分别进一步减 少了 8.42 cc、2.06%、1.02%、26.67 cc、0.58 Gy、2.35%、0.63%、32.89 cc、0.43 Gy、0.1%、1.72 Gy 0.09%,差异 有统计学意义(P值分别为0.004、< 0.010、0.006、0.010、0.006、0.004、< 0.001、0.010、< 0.001、0.005、< 0.001 0.026)。结论 早期 NSCLC SBRT 中,传统基于人群边际的 3D⁃CT 计划高估 PTV 并增加危及器官受量;采 用呼吸运动管理技术,尤其是前瞻门控更好保护胸部正常组织器官,减少患者放疗不良反应。

关键词:

非小细胞肺癌, 呼吸门控成像技术, 立体定向放射治疗, 容积旋转调强治疗, 均整器

Abstract:

Objective To investigate the dosimetric advantages of respiratory ⁃triggered prospective gating in stereotactic body radiation therapy(SBRT)for early⁃stage non⁃small⁃cell lung cancer(NSCLC). Methods A total of 21 patients with pathologically confirmed early ⁃stage NSCLC were selected and received free ⁃breathing 3D ⁃ CT,4D⁃CT cine mode and end⁃expiratory prospective respiratory⁃triggered axial⁃R mode scans,respectively. With FFF,VMAT and SBRT technology under the same condition,four corresponding plans,prospective gating(Planpro), 30% ~ 70% temporal retrospective gating(Plan30⁃70),motion enveloped method(Planall)and conventional population margin⁃based 3D⁃CT(Plan3D)were designed,respectively. The planning target volume(PTV),the V5,V20,V14.4 MLD of both ipsilateral lung and bilateral lung,the normal tissue complication probability(NTCP)of the bilateral lung,heart Dmax,esophagus Dmax,the NTCP of the esophagus,spinal cord Dmax and proximal bronchial tree Dmax were compared. Results Statistically significant differences were found between Planall and Plan3D for all dosimetric parameters except spinal cord Dmax(P < 0.05). Compared with Planall,Planpro showed further reductions in PTV,ipsilat⁃ eral lung V5,V20,V14.4,MLD,bilateral lung V5,V20,V14.4,MLD,NTCP,heart Dmax and esophagus NTCP compared to Plan30⁃70 by 8.42 cc,2.06%,1.02%,26.67 cc,0.58 Gy,2.35%,0.63%,32.89 cc,0.43 Gy,0.1%,1.72 Gy and 0.09%(P = 0.004,< 0.010,0.006,< 0.001,0.006,0.004,< 0.001,0.010,< 0.001,0.005,< 0.001,0.026). Conclusion In SBRT for early ⁃ stage NSCLC,conventional population margin ⁃based 3D ⁃CT plans overestimated PTV and increased the exposure dose to organs at risk;respiratory motion management technologies,especially pro⁃ spective gating,could better protect normal tissues and organs in the chest and reduce adverse effects of radiotherapy.

Key words:

non?small?cell lung cancer, respiratory?gated imaging techniques, stereotactic body radia? tion therapy, volumetric modulated arc therapy, flattening filter free