Characterization of Image Quality for 3D Scatter Corrected Breast CT Images.
Characterization of Image Quality for 3D Scatter Corrected Breast CT Images.
复制标题
3D 散射校正乳腺 CT 图像的图像质量表征。
DOI：
10.1117/12.878808
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Tornai,MartinP
中科院分区：
文献类型：
--
作者：
Pachon,JanH;Shah,Jainil;Tornai,MartinP
这项研究的目的是描述我们专用的准单色光谱锥束乳房成像系统在各种乳房成分的散射校正和非散射校正条件下的图像质量。CT投影的乳房体模包含两组同心的丙烯酸球体，大小(1-8 mm)根据它们的极点位置而变化。乳房模型中填充了3种不同浓度的甲醇和水，模拟了一定范围的乳房密度(0.79-1.0g/cc)；有时还包括聚丙烯酸酯纱线来模拟乳房结缔组织。对于每种体模情况，测量所有投影角的2D散射度。然后用迭代有序子集凸算法重建散射校正投影和未校正投影。利用信噪比和对比度分析对重建图像质量进行表征，然后由观察者对不同同心圆环中的球体进行检测。结果表明，散射校正有效地减少了拔火罐伪影，提高了图像对比度和信噪比。观察者研究的结果表明，在所有密度的散射校正图像和非散射校正图像中观察到的病变数量或大小没有统计学差异。尽管如此，对不同的乳房情况应用散射校正可以提高整体图像质量。
The goal of this study was to characterize the image quality of our dedicated, quasi-monochromatic spectrum, cone beam breast imaging system under scatter corrected and non-scatter corrected conditions for a variety of breast compositions. CT projections were acquired of a breast phantom containing two concentric sets of acrylic spheres that varied in size (1-8mm) based on their polar position. The breast phantom was filled with 3 different concentrations of methanol and water, simulating a range of breast densities (0.79-1.0g/cc); acrylic yarn was sometimes included to simulate connective tissue of a breast. For each phantom condition, 2D scatter was measured for all projection angles. Scatter-corrected and uncorrected projections were then reconstructed with an iterative ordered subsets convex algorithm. Reconstructed image quality was characterized using SNR and contrast analysis, and followed by a human observer detection task for the spheres in the different concentric rings. Results show that scatter correction effectively reduces the cupping artifact and improves image contrast and SNR. Results from the observer study indicate that there was no statistical difference in the number or sizes of lesions observed in the scatter versus non-scatter corrected images for all densities. Nonetheless, applying scatter correction for differing breast conditions improves overall image quality.