扫描狭缝乳腺摄影术。

Scanning slit mammography.

作者信息

Barnes G T, Wu X, Wagner A J

机构信息

Department of Radiology, University of Alabama at Birmingham 35233.

出版信息

Med Prog Technol. 1993;19(1):7-12.

PMID:8302215

Abstract

The importance of scatter in mammography and the performance of conventional mammographic grids are reviewed. Without scatter control image contrast is significantly degraded. Conventional mammography grids improve the situation; however, their performance is limited. As a result for 5 to 8 cm thick breasts, a more ideal method of scatter control could result in a 25 to 45% improvement in contrast over that possible with conventional grids. One such approach is scanning slit mammography. The principles of this approach are presented along with the design and geometrical specifications of a prototype multiple scanning slit unit. The unit has a measured primary transmission of 91% and scatter transmission of 3%. Similarly measured performance values for a commonly used grid are 62% and 19%, respectively. Compared are images of a 6 cm breast phantom obtained with the scanning slit unit and a conventional grid. The scanning slit unit achieved noticeably greater image contrast with 30% less radiation. Also discussed are the limitations and engineering challenges of the technology.

摘要

回顾了乳腺摄影中散射的重要性以及传统乳腺摄影滤线栅的性能。如果没有散射控制，图像对比度会显著降低。传统的乳腺摄影滤线栅改善了这种情况；然而，它们的性能是有限的。因此，对于5至8厘米厚的乳房，一种更理想的散射控制方法可能会使对比度比传统滤线栅提高25%至45%。扫描狭缝乳腺摄影就是这样一种方法。介绍了这种方法的原理以及一个原型多重扫描狭缝装置的设计和几何规格。该装置测得的一次射线透过率为91%，散射透过率为3%。同样，一个常用滤线栅测得的性能值分别为62%和19%。比较了用扫描狭缝装置和传统滤线栅获得的6厘米乳房模型的图像。扫描狭缝装置在辐射减少30%的情况下实现了明显更高的图像对比度。还讨论了该技术的局限性和工程挑战。