用正弦和正方形电波形进行射频消光,以增强消光范围
Dong-Sung Won1,2, Jinsu An3, Ji Won Kim1,4
1Biomedical Engineering Research Center, Asan Institute for Life Sciences, Asan Medical Center, Seoul, Republic of Korea.
Frontiers in bioengineering and biotechnology
|September 5, 2024
概括
方形电波形式显著提高射频消化 (RFA) 范围和小鼠肝癌治疗的疗效. 这种新的方法显示,与正弦波形相比,瘤减少和存活率有所改善.
科学领域:
- 在瘤学瘤学.
- 医疗工程 医学工程
- 手术技术 手术技术
背景情况:
- 射频除 (RFA) 是用于原发性肝癌的关键局部疗法.
- 有限的废弃范围阻碍了RFA的有效性.
- 优化射频发生器参数对于改善治疗结果至关重要.
研究的目的:
- 为了比较RFA中正弦和正方形电波形的废弃范围和治疗效果.
- 评估不同波形对瘤体积和存活率的影响.
- 为了研究与每个波形相关的组织学变化.
主要方法:
- 开发一个具有可调节电波形 (正弦和正方形) 的射频发电机.
- 在猪肝脏组织中比较除范围.
- 在小鼠瘤模型 (45 BALB/c裸体小鼠) 中评估RFA疗效.
- 评估瘤体积,存活率和组织学标志物 (死亡,炎症,热冲击蛋白).
主要成果:
- 方形波形在猪肝中表现出比正弦波形显著更大的除范围 (p < 0.001).
- 用方形波形治疗的小鼠的平均瘤体积显著降低 (p < 0.001),生存率更高 (60%).
- 组织学分析显示了较大的细胞凝结性亡,炎症细胞透,热冲击蛋白和具有方形波形的瘤亡 (p < 0.05).
结论:
- 方形电波形式在RFA中提供了增强的消光范围.
- 这种波形修改提高了肝脏瘤管理的治疗效果.
- 使用方形波形的RFA具有改善癌症治疗结果的巨大潜力.
相关概念视频
02:18Interference and Diffraction
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
01:28Standing Waves in a Cavity
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by: