Modulation transfer function evaluation of cone beam computed tomography for dental use with the oversampling method
Modulation transfer function evaluation of cone beam computed tomography for dental use with the oversampling method
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DOI：
10.1259/dmfr/27069629
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发表时间：
2010-01-01
影响因子：
3.3
通讯作者：
Kurabayashi, T.
中科院分区：
文献类型：
--
作者：
Watanabe, H.;Honda, E.;Kurabayashi, T.
目的：探讨用过采样法评估牙用锥形束CT （CBCT）调制传递函数（MTF）的可能性。方法：使用带图像增强器的CBCT (3D Accuitomo)，在扫描器内放置100 μ m钨丝，与感兴趣平面垂直的平面成微角，进行扫描。利用200幅连续重构图像获得过采样线扩展函数（LSF）。对过采样LSF进行傅里叶变换，得到MTF曲线。用Catphan (R)进行线对检验。结果：过采样法获得光滑、重现性好的MTF曲线。MTF曲线显示，z轴方向的空间分辨率显著高于轴向的空间分辨率。线对检验也证实了这一结果。结论：采用过采样方法可以成功地进行MTF分析。此外，本研究明确了3D Accuitomo具有较高的空间分辨率，特别是在7轴方向上。牙颌面放射学（2010）39,28-32。doi: 10.1259 / dmfr / 27069629
Objectives: The aim was to investigate the possibility of evaluating the modulation transfer function (MTF) of cone beam CT (CBCT) for dental use using the oversampling method.Methods: The CBCT apparatus (3D Accuitomo) with an image intensifier was used with a 100 mu m tungsten wire placed inside the scanner at a slight angle to the plane perpendicular to the plane of interest and scanned. 200 contiguous reconstructed images were used to obtain the oversampling line-spread function (LSF). The MTF curve was obtained by computing the Fourier transformation from the oversampled LSF. Line pair tests were also performed using Catphan (R).Results: The oversampling method provided smooth and reproducible MTF Curves. The MTF Curves revealed that the spatial resolution in the Z-axis direction was significantly higher than that in the axial direction. This result was also confirmed by the line pair test.Conclusions: MTF analysis was performed successfully using the oversampling method. In addition, this Study clarified that the 3D Accuitomo had high spatial resolution, especially in the 7-axis direction. Dentomaxillofacial Radiology (2010) 39, 28-32. doi: 10.1259/dmfr/27069629