Cai Wenli, Kim Se Hyung, Lee June-Goo, Yoshida Hiroyuki
Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114 USA.
Annu Int Conf IEEE Eng Med Biol Soc. 2012;2012:3736-9. doi: 10.1109/EMBC.2012.6346779.
Partial volume effect (PVE) and tagging inhomogeneity are two major causes of artifacts in electronic cleansing (EC) for fecal-tagging CT colonography (CTC). Our purpose was to develop a novel method called "virtual tagging" for electronic cleansing in dual-energy fecal-tagging CTC. A three-material decomposition scheme was first applied in dual-energy CTC to decompose each voxel into a mixture of air, soft tissue, and iodine-tagged fecal material. The entire colonic lumen was then marked by virtually tagging the mixture portion of luminal air at each voxel. As a result, colon lumen including air and tagged materials was segmented and subtracted by their high values in virtually tagged images. Our virtual tagging scheme provides a cleansed colon that is free from artifacts caused by the PVE at air-tagging mixture and inhomogeneous tagging.
部分容积效应（PVE）和标记不均匀性是粪便标记CT结肠成像（CTC）电子清洗（EC）中伪影的两个主要原因。我们的目的是开发一种名为“虚拟标记”的新方法，用于双能粪便标记CTC中的电子清洗。首先在双能CTC中应用三材料分解方案，将每个体素分解为空气、软组织和碘标记粪便物质的混合物。然后通过对每个体素处的腔内空气混合部分进行虚拟标记来标记整个结肠腔。结果，包括空气和标记物质的结肠腔在虚拟标记图像中通过其高值被分割并减去。我们的虚拟标记方案提供了一个清洁的结肠，该结肠没有由空气标记混合物处的PVE和不均匀标记引起的伪影。
