Department of Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita City, Osaka, 565-0871, Japan,
Jpn J Radiol. 2013 Oct;31(10):677-84. doi: 10.1007/s11604-013-0235-3. Epub 2013 Aug 18.
To evaluate the effect of high-resolution scan mode and iterative reconstruction on lung nodule 3D volumetry.
Solid nodules with various sizes (5, 8, 10 and 12 mm) were placed inside a chest phantom. CT images were obtained with various tube currents, scan modes (conventional mode, high-resolution mode) and iterative reconstructions [0, 50 and 100 % blending of adaptive statistical iterative reconstruction (ASiR) and filtered back projection]. The nodule volumes were calculated using semiautomatic software and compared with the assumed volume from the nodules.
The mean absolute and relative percentage error improved when using iterative reconstruction especially when using the conventional scan mode; however, this effect was not significant. Significant reduction in volume overestimation was observed when using high-resolution scan mode (P = 0.011).
The high-resolution mode significantly reduces the volume overestimation of 3D volumetry. Iterative reconstruction shows a reduction in volume overestimation and error margin especially with the conventional scan mode; however, this effect was not significant.
评估高分辨率扫描模式和迭代重建对肺结节 3D 体积测量的影响。
将各种大小（5、8、10 和 12 毫米）的实性结节放置在胸部体模内。使用不同的管电流、扫描模式（常规模式、高分辨率模式）和迭代重建[0、50 和 100%混合自适应统计迭代重建（ASiR）和滤波反投影]获得 CT 图像。使用半自动软件计算结节体积，并与结节的假定体积进行比较。
使用迭代重建时，平均绝对误差和相对百分比误差均有所改善，尤其是在使用常规扫描模式时；然而，这种效果并不显著。使用高分辨率扫描模式时，体积高估显著减少（P = 0.011）。
高分辨率模式可显著减少 3D 体积测量的体积高估。迭代重建显示出体积高估和误差幅度的减少，尤其是在常规扫描模式下；然而，这种效果并不显著。
