Observer performance and dose efficiency of mammographic scanning equalization radiography.
Observer performance and dose efficiency of mammographic scanning equalization radiography.
复制标题
乳腺X线扫描均衡放射线照相的观察者性能和剂量效率。
DOI：
10.1118/1.597115
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
纤维、微钙化和低对比度病变的检测对于早期乳腺癌的检测是至关重要的。通过感官测量和拟人体模图像表明，乳腺摄影扫描均衡摄影(MSER)克服了传统乳腺摄影技术的纬度限制。MSER通过对入射曝光进行区域调制来提高图像质量，以适应患者体内X射线传输的局部变化。为了评估均衡化在乳腺病变检测中的效果，我们比较了MSER和传统成像技术中的观察者性能。观察任务是位于统一背景上的纤维、微钙化和低对比度视盘(模拟病变)的阈值可视化。观察者的表现是根据模拟乳房成分和厚度变化产生的透射率范围的背景X射线透射率来确定的。对于常规图像，纤维、微钙化和低对比度盘的阈值可见直径随着体模的X射线透射率从胶片的最佳曝光改变而增加。对于MSER图像，观察者的性能几乎与物体的背景传输无关，因为MSER确保胶片在大范围的物体传输时被最佳曝光。即使在物体X射线透射率有显著变化的情况下，也只观察到纤维原纤维、微钙化和椎间盘探查的微小变化。利用对比细节实验的结果，对常规成像技术和MSER成像技术的剂量效率进行了比较。剂量效率分析表明，MSER改变了入射照射，以保持观察者在整个乳房上的一致表现。这些结果表明，MSER将以非常有效的剂量方式，提高放射科医生在乳房X光检查致密的女性中发现早期乳腺癌的能力。
The detection of fibrils, microcalcifications, and low contrast lesions is vital to the detection of early breast cancer. It has been shown through sensitometric measures and anthropomorphic phantom images that mammographic scanning equalization radiography (MSER) overcomes the latitude limitations of conventional mammographic techniques. MSER increases image quality by regional modulation of the entrance exposure to suit the local variations in x‐ray transmission within the patient. In order to assess the effect of equalization on the detection of breast lesions, we have compared observer performance in MSER and conventional imaging techniques. The observation tasks were the threshold visualization of fibrils, microcalcifications, and low contrast discs (simulating lesions), located on a uniform background. The performance of the observers was determined for a range of background x‐ray transmission simulating the range of transmission generated by variations in breast composition and thickness. For the conventional images, the threshold visible diameter of the fibrils, microcalcifications, and low contrast discs, increased as the x‐ray transmission of the phantom changed from that for which the film was optimally exposed. For the MSER images, the performance of the observers was almost independent of the background transmission of the object since MSER ensures that the film is optimally exposed for a large range of object transmission. Even with significant changes in object x‐ray transmission, only minor changes in fibril, microcalcification, and disc detection were observed. Utilizing the results of the contrast‐detail experiment, a dose efficiency comparison of conventional and MSER imaging techniques was performed. The dose efficiency analysis showed that MSER varied the incident exposure so as to maintain consistent performance of the observer, over the entire breast. These results suggest that MSER would improve the ability of radiologists to detect early breast cancer in women presenting with mammographically dense breasts, in a very dose efficient manner.