Mammographic scanning equalization radiography.
Mammographic scanning equalization radiography.
复制标题
乳房X线扫描扫描均衡放射线照相。
DOI：
10.1118/1.597114
复制
发表时间：
1993
期刊：
影响因子：
3.8
通讯作者：
Plewes,DB
中科院分区：
文献类型：
--
作者：
Sabol,JM;Soutar,IC;Plewes,DB
众所周知，乳房厚度和实质成分的变化可产生超出高对比度乳腺摄影胶片/屏幕组合的曝光范围。致密乳腺的最佳成像是期望的，因为30%-60%的女性存在致密乳腺，并且她们被认为处于发展乳腺癌的最高相对风险。通过构建和表征原型乳腺X线扫描均衡X线摄影（MSER）系统，研究了扫描均衡X线摄影在乳腺X线摄影中的应用，该系统旨在对乳腺X线摄影体模进行成像。MSER系统通过光栅扫描2.0×1.6 cm脉冲X射线束穿过暗盒来曝光Min‐R/MRH暗盒。暗盒后面的扫描探测器测量乳房的局部X射线透射率。透射信息的反馈用于调制每个X射线脉冲的持续时间，以均衡胶片曝光。MSER系统的有效动态范围是传统乳腺X线摄影的25倍。乳腺X线体模的免扫描图像表明，MSER有效地克服了胶片/屏幕乳腺X线摄影的纬度限制，能够在宽范围的物体X射线透射下实现高对比度成像。仿真体模图像显示，MSER在常规乳房X线照片的正常曝光不足区域提供高达六倍的胶片对比度增加。入口暴露的表征表明，MSER和传统乳腺X线摄影技术之间的暴露没有显著差异，表明两者对患者造成的风险相当。计算表明，临床多波束MSER系统的构建是可行的，只需对现有技术进行微小更改。
It is well recognized that variations in breast thickness and parenchymal composition can produce a range of exposure which exceeds the latitude of high contrast mammographic film/screen combinations. Optimal imaging of the dense breast is desired since 30%–60% of women present with dense breasts, and they are believed to be at the highest relative risk of developing breast cancer. The application of scanning equalization radiography to mammography has been investigated through the construction and characterization of a prototype mammographic scanning equalization radiography (MSER) system, designed to image mammographic phantoms. The MSER system exposes a Min‐R/MRH cassette by raster scanning a 2.0×1.6 cm beam of pulsed x‐rays across the cassette. A scanning detector behind the cassette measures the local x‐ray transmission of the breast. Feedback of the transmission information is used to modulate the duration of each x‐ray pulse, to equalize the film exposure. The effective dynamic range of the MSER system is 25 times greater than that of conventional mammography. Artifact‐free images of mammographic phantoms show that MSER effectively overcomes the latitude limitations of film/screen mammography, enabling high contrast imaging over a wide range of object x‐ray transmission. Anthropomorphic phantom images show that MSER offers up to a sixfold increase in film contrast in the normally underexposed regions of conventional mammograms. Characterization of the entrance exposure shows that there is not a significant difference in exposure between MSER and conventional mammographic techniques, suggesting that both would pose comparable risk to the patient. Calculations show that the construction of a clinical multiple beam MSER system is feasible with minor changes to existing technology.