Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, Sao Paulo, Brazil.
Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, Sao Paulo, Brazil.
Oral Surg Oral Med Oral Pathol Oral Radiol. 2019 Oct;128(4):418-423. doi: 10.1016/j.oooo.2019.06.011. Epub 2019 Jun 27.
The aim of this study was to evaluate the influence of spatial resolution, bit depth, and enhancement filters on the fractal dimension (FD) of photostimulable phosphor (PSP) plate-based intraoral radiographic images of alveolar bone.
Periapical radiographs were obtained using PSP plates, which were scanned at 2 spatial resolutions: 1270 dpi and 2000 dpi. All images were subjected to 3 enhancement filters-Perio, Endo, and Fine-and exported in 8 and 16 bits. A region-of-interest was selected on alveolar bone and the FD value was calculated. The multiway analysis of variance test followed by the post hoc Tukey test compared the FD values between the different groups (α = 0.05).
No significant difference was observed in FD values between the 8- and 16-bit images. Except for the Perio filter, FD values were significantly higher for images at 1270 dpi. FD values were significantly higher for the Perio filter, followed by the Endo filter, and the Fine filter. The FD values of the Fine filter did not differ significantly from the original image.
Fractal analysis of alveolar bone obtained from PSP plate-based intraoral radiographic images is influenced by spatial resolution and some digital enhancement filters; therefore, for FD comparison purposes, images should have the same specifications.
本研究旨在评估空间分辨率、位深度和增强滤波器对光激励磷光体（PSP）板口腔内牙槽骨放射影像分形维数（FD）的影响。
使用 PSP 板获取根尖放射线照片，这些照片以 1270dpi 和 2000dpi 两种空间分辨率进行扫描。所有图像均经过 Perio、Endo 和 Fine 三种增强滤波器处理，并以 8 位和 16 位输出。在牙槽骨上选择一个感兴趣区域，并计算 FD 值。采用多因素方差分析检验，然后采用事后 Tukey 检验比较不同组之间的 FD 值（α=0.05）。
8 位和 16 位图像的 FD 值之间无显著差异。除了 Perio 滤波器外，1270dpi 图像的 FD 值显著更高。Perio 滤波器的 FD 值最高，其次是 Endo 滤波器，然后是 Fine 滤波器。Fine 滤波器的 FD 值与原始图像无显著差异。
PSP 板口腔内放射影像中牙槽骨的分形分析受空间分辨率和某些数字增强滤波器的影响；因此，为了进行 FD 比较，图像应具有相同的规格。
