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相关概念视频

Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Adjusting a Traverse01:12

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In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
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Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

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Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
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相关实验视频

Updated: Jul 3, 2025

Author Spotlight: Advancing CBCT and Digital Dental Image Integration with AI-Assisted Digitization
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一种简单而精确的对准校准方法,用于形光束计算机断层扫描与验证.

Kun-Long Shih1, David Shih-Chun Jin2, Yu Hong Wang3

  • 1Department of Electro-Optical Engineering, National Taipei University of Technology, 1, Sec. 3, Zhongxiao E. Rd., Taipei, 10608, TAIWAN.

Physics in medicine and biology
|February 15, 2024
PubMed
概括

我们开发了一种简单而精确的校准方法,称为精确对齐循环 (PAL),用于圆束计算机断层扫描 (CBCT) 系统. 帕尔精确地确定系统错位和不确定性,改善各种应用中的图像质量.

关键词:
校准 校准 校准 校准 校准 校准圆束计算机断层扫描 (CBCT)精确对齐循环的精确对齐循环圆的配件 圆的配件

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科学领域:

  • 医疗成像医学成像
  • 物理 物理学 物理
  • 工程 工程师 工程师 工程师

背景情况:

  • 圆束计算机断层扫描 (CBCT) 在牙科,医疗和工业成像中至关重要.
  • 准确的CBCT系统对齐对于高质量的图像重建至关重要.
  • 现有的校准方法可能是复杂和耗时的.

研究的目的:

  • 为具有循环轨迹的CBCT系统引入一种新,简单和精确的校准程序.
  • 准确确定系统错位及其不确定性.
  • 通过分析模拟和微型CT系统验证方法的性能.

主要方法:

  • 准确对齐循环 (PAL) 校准程序的开发.
  • 使用线珠幻影来确定错位.
  • 分析模拟用于评估精度和不确定性估计.
  • 在微型CT系统上应用和验证.

主要成果:

  • PAL精确地确定源到旋转轴距离 (SRD) 和几何中心 (G).
  • 探测器错位角度的不确定性在±0.05°以内.
  • 与现有技术相比,该方法表现出了简单和易于实施的方法.
  • 微型CT系统的校准成功,准确度高.

结论:

  • 精度对齐循环 (PAL) 为CBCT系统提供了一个简单,精确和准确的校准解决方案.
  • 通过确保准确的系统对齐,PAL有效地减少了图像工件.
  • 该方法在各种CBCT成像领域具有广泛的适用性.