相关实验视频

Updated: Sep 9, 2025

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

向量化电离辐射声学成像 (iRAI) 进行辐射剂量测量:从模拟到实验的验证

Yaocai Huang¹, Lise Wei², Dale Litzenberg²

¹Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA.

Medical physics

|September 2, 2025

概括

这项研究引入了一种使用电离辐射声学成像 (iRAI) 的新方法,以提高辐射剂量测绘的准确性. 补偿传感器的灵敏度显著提高了iRAI剂量测量的精度.

科学领域:

医学物理
生物医学工程
影像科学

背景情况:

在临床放射治疗 (RT) 中,精确的辐射剂量定量对于治疗结果的评估至关重要.
电离辐射声学成像 (iRAI) 在RT期间提供非侵入性的实时辐射剂量映射.
由于超声波传感器检测灵敏度的空间变化未经纠正,现有的iRAI方法存在重大剂量映射错误.

研究的目的:

介绍第一个检测灵敏度补偿的定量iRAI方法,用于改进沉积辐射剂量测量.
在临床辐射治疗期间提高体内辐射剂量绘制的准确性.

主要方法:

使用计算模拟 (Field II) 和实验测量生成的2D矩阵阵转换器 (MAT) 检测灵敏度图.
使用临床线性加速器 (LINAC) 和模拟声波传播 (K-Wave) 进行了体外实验.
根据iRAI重建的灵敏度图得出的应用校正因子,使用SSIM和玛指数分析比较补偿和未补偿剂量分布.

主要成果:

实验和模拟的iRAI测量显示出强烈的一致性,验证了灵敏度图.
对传感器灵敏度的补偿导致iRAI图像中的相对幅度趋同.
敏感性补偿的iRAI图像显示了与治疗计划的改善,马指数的合格率从56. 86%增加到78. 24%.

结论:

针对传感器检测灵敏度的同质性对于基于iRAI的精确辐射剂量映射至关重要.
开发的补偿iRAI方法显著提高了剂量分配重建的精度.

关键词:

剂量映射电离辐射声学成像模拟和实验验证传感器检测的灵敏度治疗计划

更多相关视频

Diffuse Optical Spectroscopy for the Quantitative Assessment of Acute Ionizing Radiation Induced Skin Toxicity Using a Mouse Model

Diffuse Optical Spectroscopy for the Quantitative Assessment of Acute Ionizing Radiation Induced Skin Toxicity Using a Mouse Model

Published on: May 27, 2016

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator

Published on: May 9, 2014

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...