用牙科CBCT设备进行头部和部成像:在幻影研究中,有效剂量和定量图像质量的360°和180°旋转角度的比较
Hakan Amasya1,2,3, Osman Günay4, Fatih Kesmezacar5
1Department of Oral and Dentomaxillofacial Radiology, Faculty of Dentistry, Istanbul University-Cerrahpaşa, Istanbul, Türkiye.
Current medical imaging
|April 18, 2025
概括
使用180度旋转角度的圆束CT (CBCT) 成像显著减少了患者的辐射剂量,与360度角度相比,该剂量减少了41%. 定量图像质量指标显示了轻微的减少,这表明在头部和部成像中剂量优化的潜力.
科学领域:
- 医学物理 医学物理
- 放射学 放射学是一门学科.
- 图像技术技术的成像技术
背景情况:
- 形束计算断层扫描 (CBCT) 广泛用于头部和部成像.
- 优化辐射剂量,同时保持诊断图像质量,对于患者安全至关重要.
- 评估不同的CBCT采集协议,如旋转角度,可以影响剂量和图像质量.
研究的目的:
- 评估完全 (360°) 和半 (180°) 旋转角度对患者辐射剂量和头CBCT中的定量图像质量的影响.
- 为了比较两个轮换协议之间的有效剂量 (ED) 和特定区域的吸收剂量.
- 为了评估信号与噪声比率 (SNR) 和对比与噪声比率 (CNR) 在减少旋转时的变化.
主要方法:
- 用67个热发光剂量计 (TLD) 在人类形象的头幻影中进行剂量测量.
- 使用Hyperion X9 Pro设备进行CBCT成像,90kV脉冲光束和13x16e FOV.
- 测试了两种成像模式 (360°和180°),有效剂量按ICRP 103指南计算. 使用SNR,CNR和在选定的地区的统一性来评估图像的定量质量.
主要成果:
- 有效剂量 (ED) 是1.903 mSv 360°和1.123 mSv 180°旋转,减少了41%.
- 在口腔粘膜 (360°) 和右状状区域 (180°) 观察到最高的吸收剂量.
- 信号与噪声比率 (SNR) 和对比与噪声比率 (CNR) 呈现小幅下降,快速/常规比率在0.83-0.91.1之间.
结论:
- 在头部和部成像中,180°与360°CBCT旋转相比,有效剂量减少了41%.
- 辐射剂量的减少比定量图像质量参数的减少更为显著.
- 图像质量降低对诊断准确性的临床影响应根据具体的成像目的来考虑.
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