Digital radiography optimization of image quality and dose using multi-frequency software
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数字化X线摄影：多频软件对图像质量和辐射剂量的优化
/H. Precht//Pediatric Radiology. 2012,42 (9):1112-1118
李晓明摘译
背景：数字化X线摄影（DR）处理的新进展，包括多频处理（MFP），可以优化图像质量和辐射剂量。
由于儿童对电离辐射比成人更敏感，这项技术特别有利于儿童的健康。目的：在DR在5岁的等效仿
真人体模型的股骨检查使用MFP软件的降低了辐射剂量是否不影响图像质量。材料和方法：采用DR
成像系统（佳能DR，CXDI-50 C探测器和MLT[S]软件）共获得110幅仿真人体模型的图像，由三位儿
科放射学专家采用视觉等级分级法对图像进行分析。此外，3500拍摄的图像的技术对比细节幻象
（CDRAD2.0）提供了一个客观的图像质量评估。结果：采用MLT（S）优化图像保持最佳的图像质量，
辐射剂量减少61％。MLT（S）优化图像达到诊断质量的图像，与标准图像相比，辐射剂量减少88％。
软件对图像质量的影响显著，包括辐射剂量（MAS）、暗区动态范围及频段。结论：通过优化的图像
处理参数，可以显著减少辐射剂量而对图像质量的无显著影响。
Digital radiography: optimization of image quality and dose using multi-frequency software
Background
New developments in processing of digital radiographs (DR), including multi-frequency processing
(MFP), allow optimization of image quality and radiation dose. This is particularly promising in
children as they are believed to be more sensitive to ionizing radiation than adults.
Objective
To examine whether the use of MFP software reduces the radiation dose without compromising
quality at DR of the femur in 5-year-old-equivalent anthropomorphic and technical phantoms.
Materials and methods
A total of 110 images of an anthropomorphic phantom were imaged on a DR system (Canon DR
with CXDI-50 C detector and MLT[S] software) and analyzed by three pediatric radiologists using
Visual Grading Analysis. In addition, 3,500 images taken of a technical contrast-detail phantom
(CDRAD 2.0) provide an objective image-quality assessment.
Results
Optimal image-quality was maintained at a dose reduction of 61% with MLT(S) optimized images.
Even for images of diagnostic quality, MLT(S) provided a dose reduction of 88% as compared to the
reference image. Software impact on image quality was found significant for dose (mAs), dynamic
range dark region and frequency band.
Conclusion
By optimizing image processing parameters, a significant dose reduction is possible without
significant loss of image quality.
