相关实验视频

Updated: Jun 13, 2025

Positron Emission Tomography-based Dose Painting Radiation Therapy in a Glioblastoma Rat Model using the Small Animal Radiation Research Platform

Positron Emission Tomography-based Dose Painting Radiation Therapy in a Glioblastoma Rat Model using the Small Animal Radiation Research Platform

Published on: March 24, 2022

蒙特卡洛模型的辐射剂量从辐射疗法表面X射线的X射线

Reham Barghash^1,2,3, Tiffany W Martin⁴, Amber R Prebble⁵

¹Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, USA.

Journal of applied clinical medical physics

|March 4, 2025

概括

表面X射线由于光电效应而显著增加骨剂量. 蒙特卡洛模拟准确量化了这种骨剂量增强,这对于放射治疗计划至关重要.

科学领域:

医学物理医学物理
辐射瘤学辐射瘤学
放射治疗物理物理

背景情况:

表面X射线 (50-100 kVp) 对于治疗非黑色素瘤皮肤癌和手术内放射治疗 (IORT) 至关重要.
在这些能量下的光电效应会导致在骨中与软组织相比吸收的剂量显著更高.

研究的目的:

用蒙特卡洛 (MC) 模拟来研究在表面X射线放射治疗期间骨剂量增强.
通过实验室测量和商业治疗计划系统来验证MC模拟的准确性.

主要方法:

采用EGSnrc MC模拟来建模Sensus SRT-100表面X射线束 (50,70,100kVp) 的模型.
对实验室测量进行了模拟光束的验证,并与SMART-ATP治疗计划系统进行了比较.
传输模拟和MC模拟用骨板的水幽灵被用来预测骨剂量.

主要成果:

与实验室测量相比,EGSnrc模拟准确地建模了表面X射线束,其平方平均误差 (RMSE) 较低.
模拟显示,在水-骨接口处的峰值骨剂量显著增加,在0.3厘米深处达到510%,为100kVp.
一个模拟的治疗计划预测了在4 Gy表面剂量时,根据使用的kVp,对头骨 (15-20 Gy) 产生大量剂量.

结论:

结合SMART-ATP,EGSnrc MC模拟是放射治疗治疗规划的有效工具.
MC模拟有效量化骨剂量增强,强调其在治疗规划和剂量计算中的关键作用.
临床医生应在治疗前测量骨深度,以减轻表面X射线放射治疗期间的过量骨剂量.

关键词:

欧洲经济论坛欧洲经济论坛在HVL中,HVL是HVL.蒙特卡洛模拟的蒙特卡洛模拟.在 PDD PDD 的情况下.骨剂量骨剂量光电效应是一种光电效应.辐射疗法辐射疗法表面的X射线是表面的X射线

更多相关视频

Dosimetry for Cell Irradiation using Orthovoltage 40-300 kV X-Ray Facilities

Dosimetry for Cell Irradiation using Orthovoltage 40-300 kV X-Ray Facilities

Published on: February 20, 2021

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Published on: March 11, 2021

相关概念视频

Biological Effects of Radiation

Biological Effects of Radiation

All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...

X-ray Imaging

X-ray Imaging

German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...