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圆束计算机断层扫描机的灰色值和噪声行为 - - 一项体外研究

Nicolly Oliveira-Santos^1,2, Hugo Gaêta-Araujo³, Rubens Spin-Neto⁴

¹Department of Oral Surgery and Stomatology, Division of Diagnostic Sciences, School of Dental Medicine, University of Bern, Bern, 3010, Switzerland.

Dento maxillo facial radiology

|November 20, 2024

概括

圆束计算机断层扫描 (CBCT) 图像显示不同机器和采集设置的平均灰色值 (MGV) 和噪声的显著变化. 视野大小是影响MGV的主要因素,特别是骨密度.

科学领域:

放射学和成像科学放射学和成像科学
医学物理医学物理
牙科成像技术牙科成像技术

背景情况:

圆束计算机断层扫描 (CBCT) 对于牙科和口面部成像至关重要.
标准化质量保证对于可靠的CBCT成像至关重要.
了解获取参数对图像质量指标的影响至关重要.

研究的目的:

系统地评估CBCT成像中的平均灰度值 (MGVs) 和噪声.
评估各种采集参数对图像质量的影响.
为了比较9台不同的CBCT机器的性能.

主要方法:

使用DIN6868-161幻影与骨,软组织和空气等价物.
在9台CBCT机器上扫描了幻影,改变了管电流 (mA),管电压 (kV),视野 (FOV) 和旋转角度.
使用Kruskal Wallis和Dunn-Bonferroni测试分析了MGV和对比噪声指标 (CNI).

主要成果:

管道电流一般不会影响MGVs.
在一些机器 (Viso G7,Veraview X800) 中,增加kV降低了MGVs.
在大多数机器中,MGV随着FOV高度的增加而减少;旋转角度的影响最小.
随着辐射的减少和更大的FOVs,CNI较低.

结论:

在MGV和噪音方面存在显著的机器间变化.
FOV大小是影响MGV的主要因素,特别是在骨等价放射密度方面.
图像质量指标通常随着获取参数的增加而下降.

关键词:

在CBCT中,CBCT是CBCT.圆束计算机断层扫描技术灰色的值是指灰色的值.影像成像技术影像成像技术幽灵是什么意思幽灵是什么意思

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