在一个治疗过程中同时优化多个计划,用于暂时羽毛辐射治疗的剂量测量路径
Julius Arnold1,2,3, Chengchen Zhu1, Gian Guyer1
1Division of Medical Radiation Physics and Department of Radiation Oncology, Inselspital, Bern University Hospital and University of Bern, Bern, Switzerland.
Medical physics
|September 10, 2025
概括
这项研究引入了一种新的放射治疗规划方法,可以同时优化多个治疗子计划. 这种方法提高了目标剂量的均性,并减少了风险器官的剂量,潜在地提高了治疗疗效和患者康复.
科学领域:
- 辐射瘤学 辐射瘤学
- 医学物理 医学物理
- 计算生物学 计算生物学
背景情况:
- 传统的辐射疗法通过一遍又一遍地提供单一的治疗计划.
- 先进的技术,如非共平面光束角度优化和剂量测量优化路径 (DOP) 提高剂量分配的合规性.
- 使用多个子计划来利用时间维度,例如暂时羽毛辐射疗法 (TFRT),可以交替使用高剂量和低剂量的OAR,促进组织恢复.
研究的目的:
- 为多个共平面或非共平面放射治疗子计划提供同时优化框架.
- 适用此框架进行暂时羽毛辐射疗法 (TFRT) 规划.
- 通过使用DOP或不使用DOP的直接光圈优化来研究子图的优化.
主要方法:
- 制定了一个框架,以最大限度地减少一个客观的功能,包括剂量量,一般的等效均剂量,以及每个子计划和总计划的正常组织目标.
- 使用VMAT和动态聚合器轨迹放射治疗 (colli-DTRT) 创建了参考单一计划.
- 研究了TFRT高至低剂量调制在具有不同调制水平的数字幻影上 ("软"",中"",硬"",超软"),并将"中等"TFRT与 colli-DTRT应用于三个头癌症病例.
主要成果:
- 部分计划是单独治疗的,目标D98%在参考计划的1.6%内.
- 在高剂量和低剂量分数之间实现了显著的OAR剂量调节 (VMAT和colli-DTRT中处方剂量的中位数差异为2.7%-7.5%).
- 与参考计划相比,总体计划的同质性指数有所改善,OAR平均剂量有所降低,但在特定情况下有显著的例外.
结论:
- 为TFRT规划成功开发并实施了一种用于同时优化多个放射治疗子计划的新框架.
- 该方法有效地调节了OAR剂量在各个子计划中.
- 与传统的单一计划方法相比,同时优化增加了目标剂量的一致性,并在整体治疗计划中减少了OAR剂量.
相关概念视频
01:25Determination of Multiple Dosing Parameters: Loading and Maintenance Doses
224
A loading dose is an essential pharmacological strategy to rapidly achieve the target plasma drug concentration necessary for an immediate therapeutic effect. This approach is especially critical for drugs characterized by slow absorption or extended half-lives, where delaying therapeutic plasma levels could compromise treatment outcomes. By administering a loading dose, clinicians ensure a prompt onset of drug action, even for agents with complex pharmacokinetic profiles.Achieving steady-state...
224
01:15Determination of Multiple Dosing Parameters: Steady-State, Minimum and Maximum Concentrations
238
Gentamicin, an aminoglycoside antibiotic, is commonly administered via intermittent intravenous infusion to treat severe infections. An intermittent one-hour infusion of gentamicin, administered at eight-hour intervals, allows for precise control of plasma drug concentrations, minimizing toxicity while ensuring therapeutic efficacy. Pharmacokinetic principles govern the dynamics of plasma concentrations and can be mathematically described using specific equations.The plasma drug concentration...
238
02:49Cancer Therapies
9.8K
Cancer therapies are various modes of treatment, such as surgery, radiation therapy, and chemotherapy that are administered to cancer patients.
However, cancer treatments can pose several challenges, as therapies used to kill cancer cells are generally also toxic to normal cells. Moreover, cancer cells mutate rapidly and can develop resistance to chemical agents or radiation therapy. Besides, all types of cancer cells may not respond to the same therapy. Some cancer cells respond to one...
However, cancer treatments can pose several challenges, as therapies used to kill cancer cells are generally also toxic to normal cells. Moreover, cancer cells mutate rapidly and can develop resistance to chemical agents or radiation therapy. Besides, all types of cancer cells may not respond to the same therapy. Some cancer cells respond to one...
9.8K
02:50Combination Therapies and Personalized Medicine
5.9K
Combining two or more treatment methods increases the life span of cancer patients while reducing damage to vital organs or tissue from the overuse of a single treatment. Combination therapy also targets different cancer-inducing pathways, thus reducing the chances of developing resistance to treatment.
The combination of the drug acetazolamide and sulforaphane is a good example of combination therapy to treat cancer. The cells in the interior of a large tumor often die due to the hypoxic and...
The combination of the drug acetazolamide and sulforaphane is a good example of combination therapy to treat cancer. The cells in the interior of a large tumor often die due to the hypoxic and...
5.9K