相关实验视频
Updated: Jul 12, 2025

05:40
Using an Automated Hirschberg Test App to Evaluate Ocular Alignment
Published on: March 24, 2020
12.3K
手动指南针测量和三角形测量来确定位
Weili Zhang1, Junlin Zeng2, Yile Chen1
1Department of Ophthalmology, Peking University Shenzhen Hospital, Shenzhen, 518036, Guangdong, China.
International ophthalmology
|October 24, 2023
概括
手动指南针测量和三角形测定位 (MCMATDP) 是测量位的一致且可行的方法. 这种非侵入性技术提供了一个简单的,廉价的替代计算机断层扫描 (CT) 临床proptosis评估.
科学领域:
- 眼科医生 眼科 眼科
- 医疗成像医学成像
- 生物医学工程 生物医学工程
背景情况:
- 质测量对于诊断和监测各种眼科疾病至关重要.
- 目前用于质评估的方法在侵入性,成本或复杂性方面可能存在局限性.
- 准确可靠的测量技术对于有效的患者管理至关重要.
研究的目的:
- 评估手动指南针测量和三角度测定 (MCMATDP) 的准确性和一致性.
- 为了比较MCMATDP方法与计算机断层扫描 (CT) 来测量proptosis.
- 评估MCMATDP技术的临床可行性.
主要方法:
- 这项协议研究涉及60名没有眼部疾病或损伤的患者的120只眼睛.
- 使用MCMATDP和计算机断层扫描 (CT) 测量了proptosis.
- 布兰德-阿尔特曼图片被用来分析协议和两个测量方法之间的差异.
主要成果:
- 该研究包括60名患者 (25名男性,35名女性),平均年龄为38.3岁.
- 在CT测量后的proptosis和MCMATDP测量之间观察到强烈的相关性.
- CT和MCMATDP之间的95%一致性极限很窄,在两只眼睛之间从-0.55毫米到0.60毫米不等,这表明一致性很好.
结论:
- 与CT相比,MCMATDP显示出高的一致性和准确性,用于测量proptosis.
- 该MCMATDP方法是一个可行的,非侵入性的,简单的,和成本效益的工具,用于临床proptosis评估.
- 未来非接触式软件的发展可能会进一步提高基于MCMATDP的测量模式的实用性.
相关概念视频
Compass
69
The compass is a fundamental instrument that operates by aligning its magnetic needle with Earth's magnetic field. This alignment facilitates navigation and orientation, offering a means to determine direction relative to magnetic north. However, the magnetic needle points to magnetic north, which differs slightly from true geographic north due to magnetic declination, which is the angular deviation between these two points. Declination varies based on geographic location and shifts over time...
69
Adjusting a Traverse
66
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...
66
Meridians
405
In surveying, meridians are vital reference lines to measure directions and establish accurate land orientations. Meridians run from the north to the south poles, providing a stable framework for angular measurements and mapping. Meridians are fundamental in survey design, with the primary types being astronomic, magnetic, and assumed meridians. Each type offers distinct benefits and limitations, selected based on the project's scale and precision needs.The astronomic meridian is aligned with...
405
Design Example: Traverse Angle Computations
86
Traverse angle computations are a critical component of surveying, used to compute the internal angles within a closed traverse. A traverse consists of a series of connected lines forming a closed loop, often used for land boundary delineation or mapping. Calculating the internal angles ensures accuracy in the traverse geometry and is essential for checking survey data integrity.The process begins with known azimuths and bearings of the traverse sides. Internal angles at each vertex are...
86
Design Example: Marking Boundaries of a Site Using a Compass
45
Marking site boundaries using a compass is a precise surveying technique that ensures the accuracy of boundary delineation. The process begins by using provided site details, including the bearings and lengths of each boundary line. The initial step involves calculating latitudes and departures for all sides of the site. This computation verifies that the traverse is free of errors, ensuring a closed and accurate boundary.The process starts at a known point, such as Point A, which is often...
45
Coordinates and Map Projections
48
Coordinates and map projections are essential tools in accurately representing the Earth's surface for various applications, ranging from navigation to spatial analysis. The latitude and longitude coordinate system is a universally recognized framework for defining locations. Latitude specifies the distance of a point north or south of the equator, measured in degrees from 0° at the equator to 90° at the poles. Longitude indicates a location's position east or west of the prime meridian,...
48

