Takao H, Doi I, Tateno M
Department of Radiology, Showa General Hospital, Kodaira, Tokyo, Japan.
Br J Radiol. 2007 Feb;80(950):85-9. doi: 10.1259/bjr/29418923. Epub 2006 Jul 19.
The purpose of this study was to objectively evaluate the registration accuracy of an automated temporal subtraction system of thin-section thoracic CT. The automated subtraction system was applied to data from 20 subjects with lung diseases. The registration accuracy was evaluated based on the concept of target registration error using 19 landmarks chosen at the bifurcations of segmental bronchi. The landmarks were identified, and the displacements of the landmarks were measured. The average displacements of the landmarks in x, y and z directions were 0.56 pixels+/-0.64 (SD), 0.56 pixels+/-0.62 (SD, standard deviation) and 0.28 sections+/-0.40 (SD), respectively. Differences in average displacements between the landmarks were not statistically significant. Our computer system demonstrated promising results. The average displacements of the landmarks were less than the dimensions of a voxel. Further study is necessary to determine whether such a computer system can improve the diagnostic performance of radiologists.
本研究的目的是客观评估胸部薄层CT自动时间减影系统的配准准确性。将该自动减影系统应用于20例肺部疾病患者的数据。基于目标配准误差的概念，使用在段支气管分叉处选择的19个标志点来评估配准准确性。识别这些标志点并测量其位移。标志点在x、y和z方向上的平均位移分别为0.56像素±0.64（标准差）、0.56像素±0.62（标准差）和0.28层±0.40（标准差）。标志点之间平均位移的差异无统计学意义。我们的计算机系统显示出有前景的结果。标志点的平均位移小于一个体素的尺寸。有必要进一步研究以确定这样的计算机系统是否能提高放射科医生的诊断性能。
