The effects of voltage of x-ray tube on fractal dimension and anisotropy of diagnostic image
백지선, 이삼선, 박관수, 허경회, 이원진, 허민석, 최순철,
소속 상세정보
백지선 ( Baik Jee-Seon ) - 서울대학교 치과대학
이삼선 ( Lee Sam-Sun ) - 서울대학교 치과대학 구강악안면방사선학교실
박관수 ( Park Kwan-Soo ) - 인제대학교 의과대학 상계백병원 방사선과학교실
허경회 ( Huh Kyung-Hoe ) - 서울대학교 치과대학 구강악안면방사선학교실
이원진 ( Yi Won-Jin ) - 서울대학교 치과대학 구강악안면방사선학교실
허민석 ( Heo Min-Suk ) - 서울대학교 치과대학 구강악안면방사선학교실
최순철 ( Choi Soon-Chul ) - 서울대학교 치과대학 구강악안면방사선학교실
KMID : 0896020070370040211
Abstract
Purpose : The purpose of this study was to evaluate the effect of the kV on fractal dimension of trabecular bone in digital radiographs.
Materials & Methods : 16 bone cores were obtained from patients who had taken partial resection of tibia due to accidents. Each bone core along with an aluminum step wedge was radiographed with an occlusal film at 0.08 sec and with the constant film-focus distance (32 cm). All radiographs were acquired at 60, 75, and 90 kV. A rectangular ROI was drawn at medial part, distal part, and the bone defect area of each bone core image according to each kV. The directional fractal dimension was measured using Fourier Transform spectrum, and the anisotropy was obtained using directional fractal dimension. The values were compared by the repeated measures ANOVA.
Results : The fractal dimensions increased along with kV increase (p?0.05). The anisotropy measurements did not show statistically significant difference according to kV change. The fractal dimensions of the bone defect areas of the bone cores have low values contrast to the non-defect areas of the bone cores. The anisotropy measurements of the bone defect areas were lower than those of the non-defect areas of the bone cores, but not statistically significant.
Conclusion : Fractal analysis can notice a difference of a change of voltage of x-ray tube and bone defect or not. And anisotropy of a trabecular bone is coherent even with change of the voltage of x-ray tube or defecting off a part of bone. (Korean J Oral Maxillofac Radiol 2007; 37 : 211-5)
키워드
KV; Anisotropy; Fractal Dimension
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