Moeckli R, Verdun F R, Fiedler S, Pachoud M, Schnyder P, Valley J F
University Institute of Applied Radiophysics, Lausanne, Switzerland.
Phys Med Biol. 2000 Dec;45(12):3509-23. doi: 10.1088/0031-9155/45/12/301.
The shape of the energy spectrum produced by an x-ray tube has a great importance in mammography. Many anode-filtration combinations have been proposed to obtain the most effective spectrum shape for the image quality-dose relationship. On the other hand, third generation synchrotrons such as the European Synchrotron Radiation Facility in Grenoble are able to produce a high flux of monoenergetic radiation. It is thus a powerful tool to study the effect of beam energy on image quality and dose in mammography. An objective method was used to evaluate image quality and dose in mammography with synchrotron radiation and to compare them to standard conventional units. It was performed systematically in the energy range of interest for mammography through the evaluation of a global image quality index and through the measurement of the mean glandular dose. Compared to conventional mammography units, synchrotron radiation shows a great improvement of the image quality-dose relationship, which is due to the beam monochromaticity and to the high intrinsic collimation of the beam, which allows the use of a slit instead of an anti-scatter grid for scatter rejection.
X射线管产生的能谱形状在乳腺摄影中非常重要。人们提出了许多阳极-滤过组合，以获得图像质量-剂量关系方面最有效的能谱形状。另一方面，第三代同步加速器，如位于格勒诺布尔的欧洲同步辐射装置，能够产生高通量的单能辐射。因此，它是研究乳腺摄影中束流能量对图像质量和剂量影响的有力工具。采用一种客观方法来评估同步辐射乳腺摄影中的图像质量和剂量，并将其与标准传统设备进行比较。通过评估全局图像质量指标和测量平均腺体剂量，在乳腺摄影感兴趣的能量范围内系统地进行了该评估。与传统乳腺摄影设备相比，同步辐射显示出图像质量-剂量关系有了很大改善，这归因于束流的单色性以及束流的高固有准直性，这使得可以使用狭缝而不是反散射栅格来抑制散射。
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