邮件订阅 RSS

      医用直线加速器CBCT不同扫描条件对图像质量的影响分析

      Analysis of the Influence of Different Scanning Conditions of Medical Linear Accelerator CBCT on Image Quality

        摘要
      • 摘要:
        目的 探讨医用直线加速器锥形束 CT（CBCT）不同扫描条件对图像质量的影响，为CBCT图像引导系统在不同部位的扫描条件选择提供参考。
        方法 设置不同的扫描条件，使用CBCT对Catphan 503模体进行扫描，并分析空间分辨率、噪声、均匀性、空间几何精度及低对比度分辨率对CBCT图像质量的影响。
        结果 对于头部、胸部、腹部，随着扫描参数值的增大，噪声分别降低了47.4%、26.1%、51.3%，均匀性分别降低了30.2%、26.6%、47.9%，低对比度分辨率分别降低了50.6%、34.2%、12.0%。不同的扫描条件对空间几何精度、空间分辨率的影响不明显。
        结论 不同扫描条件对医用直线加速器CBCT图像质量有一定影响。可根据不同患者选择较低的扫描条件，以减少患者额外辐射剂量，为CBCT图像引导系统在放射治疗中的安全应用提供参考。

         

        Abstract:
        Objective To investigate the influence of different scanning conditions on the image quality of medical electron accelerator cone-beam computed tomography (CBCT) and provide a reference for the selection of scanning conditions for different body parts. Methods Set different scanning conditions, the Catphan 503 phantom was scanned using CBCT parameters to analyze the influence of spatial resolution, noise, uniformity, spatial geometric accuracy, and low-contrast resolution on the image quality of CBCT.
        Results  For the head, chest, and abdomen, with the increase in scanning parameter values, the noise value decreased by 47.4%, 26.1%, and 51.3% respectively, and the uniformity values decreased by 30.2%, 26.6%, and 47.9% respectively. The low-contrast resolution values decreased by 50.6%, 34.2%, and 12.0%. The influence of different scanning conditions on spatial geometric accuracy and spatial resolution is not significant.
        Conclusion Different scanning parameters have a certain influence on the image quality of medical electron accelerator CBCT. Lower scanning parameters can be selected based on individual patients to reduce the additional radiation dose, providing a reference for the safe application of CBCT image guidance in radiotherapy.

         

        • HTML全文
        • 参考文献(20)
        • 相关文章
        • 施引文献
      • 资源附件(0)

      /

      返回文章
      返回