Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Scanning Electron Microscopy01:07

Scanning Electron Microscopy

4.2K
A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
Accelerated...
4.2K
Overview of Electron Microscopy01:25

Overview of Electron Microscopy

9.0K
The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
9.0K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Intranasal Replicating Adenovirus type 4-SARS-CoV-2 Recombinants Induce Superior Immune Response Durability and Efficacy in Preclinical Testing Compared to Standard Intramuscular Vaccines.

bioRxiv : the preprint server for biology·2026
Same author

Intranasal replicating adenovirus type 4-vectored SARS-CoV-2 vaccines induce durable and efficacious responses in preclinical testing.

iScience·2026
Same author

Pacemaker response to scattered radiation of different dose rates.

Physics in medicine and biology·2026
Same author

Underscoring the Effects of Proton Radiation on Neuronal Function in 2D and 3D In Vitro Cortical Tissue Models.

Radiation research·2026
Same author

High-flux entangled photon generation via clinical megavoltage radiotherapy beams for quantum imaging and theranostics.

Physics in medicine and biology·2026
Same author

Interobserver image registration variability impacts on stereotactic arrhythmia radioablation (STAR) target margins.

Biomedical physics & engineering express·2026

相关实验视频

Updated: Jun 25, 2025

Using Synchrotron Radiation Microtomography to Investigate Multi-scale Three-dimensional Microelectronic Packages
08:46

Using Synchrotron Radiation Microtomography to Investigate Multi-scale Three-dimensional Microelectronic Packages

Published on: April 13, 2016

10.1K

面向用于高能电子放射治疗的多层微结构探测器.

Davide Brivio1,2, Arianna Liles1,3, Matthew Gagne3,4

  • 1Brigham and Women's Hospital, Boston, Massachusetts, USA.

Medical physics
|May 21, 2024
PubMed
概括

这项研究引入了一种用于电子束剂量计的新型气凝高能电流 (HEC) 探测器. 在超高剂量率放射疗法 (FLASH) 和非常高能电子 (VHEE) 应用中,HEC探测器显示出前景.

关键词:
梁监测 梁监测 梁监测 梁监测剂量测量方法 剂量测量方法一个电子束的电子束.

更多相关视频

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
06:28

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

Published on: January 30, 2020

12.5K
Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
07:31

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

Published on: May 9, 2014

11.8K

相关实验视频

Last Updated: Jun 25, 2025

Using Synchrotron Radiation Microtomography to Investigate Multi-scale Three-dimensional Microelectronic Packages
08:46

Using Synchrotron Radiation Microtomography to Investigate Multi-scale Three-dimensional Microelectronic Packages

Published on: April 13, 2016

10.1K
Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
06:28

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

Published on: January 30, 2020

12.5K
Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
07:31

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

Published on: May 9, 2014

11.8K

科学领域:

  • 医学物理 医学物理
  • 放射治疗技术 放射治疗技术
  • 辐射检测 辐射检测 辐射检测

背景情况:

  • 在放射治疗中电子束应用的复兴,包括超高剂量速率 (FLASH) 和非常高能电子 (VHEE),需要先进的电子束监测和剂量测量技术.
  • 这些先进的电子束技术的临床转化取决于开发新的,可靠的剂量测量方法.

研究的目的:

  • 研究多层纳米孔气凝高能电流 (HEC) 探测器作为电子束剂量计的潜力.
  • 评估探测器适用于非常高剂量率应用的适用性,评估其对辐射损伤和信号和的抗性.
  • 通过实验和计算方法探索探测器对不同电子能量和残余范围的反应,为FLASH和VHEE应用建立基线.

主要方法:

  • 使用不同层厚度 (10-70μm) 的 (Al),气凝 (A) 和 (Ta) 模块构建多层HEC探测器.
  • 来自3-21个电极的信号采集,外部电压偏差为零,测量为水等效塑料中的深度函数.
  • 使用Varian TrueBeam进行6,9,12和15 MeV的能量电子束辐射.
  • 使用CEPXS/ONEDANT的1D确定性代码对相同的探测器几何进行计算模拟.
  • 在水中使用二极管测量百分比深度剂量 (PDD(z)) 来分析不同能量和残留范围的HEC探测器响应.

主要成果:

  • 从Ta电极测量的电流反映了水中的能量沉积模式,与临床PDD的导数相关,对光子污染进行了校正.
  • 来自Ta电极的信号呈现出正面值,深度下降到R50的负最小值,并在实际范围 (Rp) 附近返回零.
  • Al电极产生了一个类似于电子 PDD (z) 的信号,但其表面信号减少,并增加了制动辐射尾部.
  • 从Ta和Al电极中减去信号,得到了更正的PDD (z,E) 曲线,考虑了制动辐射污染.

结论:

  • 多层HEC传感器对电子束具有独特的响应特性,与传统的离子室或二极管不同.
  • 传感器对电子不平衡的敏感性使高Z电极能够提供与电荷沉积成比例的信号.
  • 观察到的信号模式可以有效地使用百分比深度剂量 (PDD(z)) 的导数进行建模.