Ng Eldon, Vasefi Fartash, Kaminska Bozena, Chapman Glenn H, Carson Jeffrey J L
Imaging Program, Lawson Health Research Institute, 268 Grosvenor St. London, Ontario, Canada.
Opt Express. 2010 Sep 13;18(19):19444-55. doi: 10.1364/OE.18.019444.
In Angular Domain Imaging, image contrast and resolution are position dependent. The objective of this work was to characterize the contrast and resolution of an ADI system at a multitude of locations within the imaging plane, then compare the reconstructions of different targets using filtered back projection and iterative reconstruction algorithms. Contrast varied significantly with depth and minimally with lateral position, while resolution varied significantly with lateral position and minimally with depth. The iterative reconstruction algorithm was robust against ring and streak artifacts. The back projection reconstructions suffered from artifacts related to a lack of projection data.
在角域成像中，图像对比度和分辨率与位置有关。这项工作的目的是在成像平面内的多个位置表征ADI系统的对比度和分辨率，然后使用滤波反投影和迭代重建算法比较不同目标的重建结果。对比度随深度变化显著，随横向位置变化最小，而分辨率随横向位置变化显著，随深度变化最小。迭代重建算法对环形和条纹伪影具有鲁棒性。反投影重建受到与投影数据不足相关的伪影影响。
