壁挂RGSC摄像机的增强校准方法:缓解基线偏移由CT沙发下垂引起的基线偏移
Jiangtao Wang1, Jinyou Hu1, Xiangxiang Liu1
1Cancer Center, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, Sichuan, China.
PloS one
|September 29, 2025
概括
这项研究引入了一种改进的校准技术,以减少CT沙发下垂引起的呼吸道门系统错误. 新方法显著减少了基线漂移,提高了瘤运动管理的准确性.
科学领域:
- 医学成像物理 医学成像物理
- 放射治疗技术 放射治疗技术
- 图像指导疗法是指导图像的疗法.
背景情况:
- 图像扫描仪沙发的松动将噪音引入呼吸信号中,影响瘤运动管理的准确性.
- 精确的呼吸门依赖于在CT扫描期间精确跟踪患者运动.
研究的目的:
- 为安装在墙上的呼吸门对扫描仪 (RGSC) 摄像机提供一个增强的校准方法.
- 为了减少校准不确定性和缓解基线漂移,由CT沙发下垂造成的.
主要方法:
- 一个70公斤的重量模拟患者在CT桌上的负载.
- 反射器块使用激光对齐系统和CT控制台精确定位.
- 校准测量在横向和纵向位置的9个点进行,并使用Varian的方法进行比较.
主要成果:
- 块定位的不确定性减少到亚毫米级.
- 其余基线漂移显著减轻,从2.84 ± 0.22毫米降至0.64 ± 0.06毫米 (p<0.001).
结论:
- 拟议的校准方法强有力的最小化定位不确定性,并减少基线偏移从CT沙发下垂.
- 这提高了壁挂相机校准的可重复性和准确性.
- 该方法的多功能性支持墙壁和天花板上的摄像机,扩大了临床实用性.
相关概念视频
Calibration Curves: Linear Least Squares
4.1K
A calibration curve is a plot of the instrument's response against a series of known concentrations of a substance. This curve is used to set the instrument response levels, using the substance and its concentrations as standards. Alternatively, or additionally, an equation is fitted to the calibration curve plot and subsequently used to calculate the unknown concentrations of other samples reliably.
For data that follow a straight line, the standard method for fitting is the linear...
For data that follow a straight line, the standard method for fitting is the linear...
4.1K
Common Leveling Mistakes and Errors
406
A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...
406
Glassware Calibration
1.3K
Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
1.3K
Calibration Curves: Correlation Coefficient
4.5K
In a linear calibration curve, there is a value called the calibration coefficient, denoted by 'r,' which measures the strength and the direction of association between two variables. The correlation coefficient value ranges from −1 to +1. A value of +1 indicates a perfect positive linear correlation, −1 denotes a perfect negative correlation, and 0 implies no correlation between the two variables. A positive correlation value establishes that as one variable increases, the...
4.5K


