대한구강악안면방사선학회

Korean Academy of Oral and Maxillofacial Radiology

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Cone-beam CT와 multi-detector CT영상에서 측정된 CT number에 대한 비교연구
저자 : 김동수, 한원정, 김은경
2010년|40권 2호|Page : 63-68|조회수 461
Full Text : 2010_63.pdf (274.4K)
대한구강악안면방사선학회지 2010; 40 : 63-68 Korean

 Comparison of CT numbers between cone-beam CT and multi-detector CT

 Kim DS, Han WJ, Kim EK

 Department of Oral and Maxillofacial Radiology, School of Dentistry, Dankook University

 Purpose : To compare the CT numbers on 3 cone-beam CT (CBCT) images with those on multi-detector CT (MDCT) image using CT phantom and to develop linear regressive equations using CT numbers to material density for all the CT scanner each.
 Materials and Methods : Mini CT phantom comprised of five 1 inch thick cylindrical models with 1.125 inches diameter of materials with different densities (polyethylene, polystyrene, plastic water, nylon and acrylic) was used. It was scanned in 3 CBCTs (i-CAT, Alphard VEGA, Implagraphy SC) and 1 MDCT (Somatom Emotion). The images were saved as DICOM format and CT numbers were measured using OnDemand 3D. CT numbers obtained from CBCTs and MDCT images were compared and linear regression analysis was performed for the density, ρ(g/cm3), as the dependent variable in terms of the CT numbers obtained from CBCTs and MDCT images.
 Results : CT numbers on i-CAT and Implagraphy CBCT images were smaller than those on Somatom Emotion MDCT image (p<0.05). Linear relationship on a range of materials used for this study were ρ=0.001H+1.07 with R2 value of 0.999 for Somatom Emotion, ρ=0.002H+1.09 with R2 value of 0.991 for Alphard VEGA, ρ=0.001H+1.43 with R2 value of 0.980 for i-CAT and ρ=0.001H+1.30 with R2 value of 0.975 for Implagraphy.
 Conclusion: CT numbers on i-CAT and Implagraphy CBCT images were not same as those on Somatom Emotion MDCT image. The linear regressive equations to determine the density from the CT numbers with very high correlation coefficient were obtained on three CBCT and MDCT scan. (Korean J Oral Maxillofac Radiol 2010; 40 : 63-68)

 KEY WORDS : Tomography, Cone-Beam Computed; Tomography, X-ray Computed; CT number; Mini-CT Phantom

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