Assessment of Geometric Distortion in Six Clinical Scanners Using a 3D-Printed Grid Phantom
Assessment of Geometric Distortion in Six Clinical Scanners Using a 3D-Printed Grid Phantom
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DOI：
10.3390/jimaging3030028
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发表时间：
2017-09-01
影响因子：
3.2
通讯作者：
Miquel, Marc E.
中科院分区：
文献类型：
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作者：
Jafar, Maysam;Jafar, Yassir M.;Miquel, Marc E.
开发了一种经济高效的规则结构三维 (3D) 打印网格模型，以实现与机器相关的磁共振 (MR) 失真的量化。该模型包含参考特征、“点状”对象或顶点，它们是由 3D 空间中的网格边相交而产生的。通过使用归一化互相关比较 MR 和计算机断层扫描 (CT) 数据集中相应特征的位置来计算 3D 扭曲图。报告了我们机构内六台 MRI 扫描仪在 1.5 T 和 3.0 T 场强下的结果。本研究中所有 MR 体积的平均欧几里得距离误差小于 2 毫米。六台扫描仪的最大检测误差范围为 2.4 毫米至 6.9 毫米。这项研究的结论与之前的研究一致，即 MRI 在磁场中心附近相当准确，但在磁场边缘附近则在空间上更加不准确。
A cost-effective regularly structured three-dimensional (3D) printed grid phantom was developed to enable the quantification of machine-related magnetic resonance (MR) distortion. This phantom contains reference features, "point-like" objects, or vertices, which resulted from the intersection of mesh edges in 3D space. 3D distortions maps were computed by comparing the locations of corresponding features in both MR and computer tomography (CT) data sets using normalized cross correlation. Results are reported for six MRI scanners at both 1.5 T and 3.0 T field strengths within our institution. Mean Euclidean distance error for all MR volumes in this study, was less than 2 mm. The maximum detected error for the six scanners ranged from 2.4 mm to 6.9 mm. The conclusions in this study agree well with previous studies that indicated thatMRI is quite accurate near the centre of the field but is more spatially inaccurate toward the edges of the magnetic field.