Hundertmark C, Funke M, Hermann K P, Breiter N, Grabbe E
Abteilung Röntgendiagnostik I, Georg-August-Universität Göttingen.
Aktuelle Radiol. 1997 May;7(3):135-40.
Present day mammography has not been able to make use of the advantages of digital luminescence radiography because of the limited spatial resolution. The recent development of electromagnetic focusing x-ray tube with effective focal spot sizes from 0.04 to 0.12 mm allows radiographic direct magnification with less geometric blur. It is now possible to combine direct magnification mammography with digital luminescence radiography. By combining high quality storage phosphor screens with an HQ-workstation a spatial resolution of 8 lp/mm is possible for 1.7-fold magnification. For 4-fold spot magnification views spatial resolution can be theoretically increased to approx. 20 lp/mm. One important advantage of digital radiography is the possibility of image-post-processing. This article presents two sets of standard parameters and three sets of image dependent parameters for better imaging of specific lesions, such as microcalcifications. The introduction of the the storage phosphor screen technique in mammography is one step in the development of direct digital radiography. Further interesting perspectives for the future include post-processing programs for detecting suspicious lesions which are already being clinical tested.
由于空间分辨率有限，目前的乳腺X线摄影无法利用数字荧光放射成像的优势。近期开发的电磁聚焦X射线管，有效焦点尺寸在0.04至0.12毫米之间，能够在减少几何模糊的情况下进行射线照相直接放大。现在可以将直接放大乳腺X线摄影与数字荧光放射成像相结合。通过将高质量存储磷光屏与高质量工作站相结合，对于1.7倍放大倍数，空间分辨率可达8线对/毫米。对于4倍点放大视图，理论上空间分辨率可提高到约20线对/毫米。数字放射成像的一个重要优势是图像后处理的可能性。本文提出了两组标准参数和三组与图像相关的参数，以更好地对特定病变（如微钙化）进行成像。乳腺X线摄影中存储磷光屏技术的引入是直接数字放射成像发展的一个步骤。未来进一步有趣的前景包括用于检测可疑病变的后处理程序，这些程序已经在进行临床试验。
