结合不同的金属工件减少水平与利波器和切片厚度,可视化由植入物穿孔的下管道
Débora Costa Ruiz1, Maria Fernanda Silva Andrade-Bortoletto2, Camila Porto Capel3
1Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Av. Limeira, 901, Areião , Piracicaba, SP, 13414-903, Brazil. ruiz03338@gmail.com.
Clinical oral investigations
|November 6, 2024
概括
在CBCT扫描中,高水平的金属工件减少 (MAR) 显著损害了植入物穿孔下管道的可视化. 调整MAR水平,过器和切片厚度对于准确的诊断至关重要.
科学领域:
- 圆束计算机断层扫描 (CBCT) 成像
- 牙科植入物学 牙科植入物学
- 放射学和成像分析分析.
背景情况:
- 牙植入物中的金属文物可以在CBCT扫描上掩盖关键的解剖结构.
- 精确的下管道可视化对于安全的植入物安置和诊断并发症至关重要.
研究的目的:
- 评估金属工件减少 (MAR) 工具水平,结合不同的过器和切片厚度,如何影响CBCT扫描上植入物穿孔的下沟通道的检测.
- 客观地评估这些成像参数组合对诊断准确性的影响.
主要方法:
- 从干燥的下获得CBCT扫描,植入物放置在下通道上方和内部.
- 扫描使用不同的MAR水平 (关闭,中,高),过器 (没有,Sharpen 1x,Sharpen 2x) 和切片厚度 (0,1,2毫米) 来分析扫描.
- 通过评估灰色值和计算AUC,灵敏度和特异性等指标来评估图像质量.
主要成果:
- 高水平的MAR显著降低了接收器操作特征曲线 (AUC) 下的面积和灵敏度 (p < 0.0001).
- 使用MAR工具降低了灰色的平均值 (p < 0.01),使用Sharpen 2x过器降低了标准偏差 (p < 0.012).
结论:
- 高水平的MAR设置会损害CBCT图像上的下腔通道被植入物穿孔的可视化.
- MAR工具,过器选择和切片厚度极大地影响CBCT图像质量和与植入物相关的并发症的诊断准确性.
相关概念视频
Laminar Flow
Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
Minor Losses in Pipes
In pipe systems, minor losses refer to energy losses arising from components such as valves, bends, fittings, expansions, and other features that disrupt the steady flow of fluid. These disturbances cause energy dissipation through turbulence and resistance, which engineers quantify to manage system efficiency effectively.
Valves play a significant role in generating minor losses by obstructing or redirecting the fluid flow. When a valve is closed or partially closed, it restricts the flow...
Valves play a significant role in generating minor losses by obstructing or redirecting the fluid flow. When a valve is closed or partially closed, it restricts the flow...
Multiple Pipe Systems
Multipipe systems consist of complex configurations of interconnected pipes designed to transport fluids efficiently across intricate networks. They are essential in engineering applications requiring precise control over flow distribution, pressure, and head loss. They are categorized into series, parallel, loop, and network configurations, each distinguished by unique flow characteristics and applications.
Series Configuration
In a series configuration, fluid flows sequentially from one pipe...
Series Configuration
In a series configuration, fluid flows sequentially from one pipe...
Pipe Flowrate Measurement
In pipe flow measurement, orifice, nozzle, and Venturi meters are commonly used to determine fluid flowrates by constricting the flow area, which increases fluid velocity and reduces pressure. This pressure difference, governed by Bernoulli's principle and adjusted for real-world conditions, is essential for calculating flowrate. Each meter type is suited to specific applications based on accuracy, efficiency, and compatibility with various flow conditions.
The orifice meter is a simple,...
The orifice meter is a simple,...


