Imaging Science in Dentistry

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
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Image characteristics of cone beam computed tomography using a CT performance phantom

CT performance phantom을 이용한 cone beam형 전산화단층영상의 특성

  • Han, Choong-Wan (Department of Oral and Maxillofacial Radiology, School of Dentistry and Institute of Oral Biology, Kyung Hee University) ;
  • Kim, Gyu-Tae (Department of Oral and Maxillofacial Radiology, School of Dentistry and Institute of Oral Biology, Kyung Hee University) ;
  • Choi, Yong-Suk (Department of Oral and Maxillofacial Radiology, School of Dentistry and Institute of Oral Biology, Kyung Hee University) ;
  • Hwang, Eui-Hwan (Department of Oral and Maxillofacial Radiology, School of Dentistry and Institute of Oral Biology, Kyung Hee University)
  • 한충완 (경희대학교 치의학전문대학원 구강악안면방사선학교실 및 구강생물학연구소) ;
  • 김규태 (경희대학교 치의학전문대학원 구강악안면방사선학교실 및 구강생물학연구소) ;
  • 최용석 (경희대학교 치의학전문대학원 구강악안면방사선학교실 및 구강생물학연구소) ;
  • 황의환 (경희대학교 치의학전문대학원 구강악안면방사선학교실 및 구강생물학연구소)
  • Published : 2007.09.30
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Abstract

Purpose: To evaluate the characteristics of (widely used) cone beam computed tomography (CBCT) images. Materials and Methods: Images were obtained with CT performance phantoms (The American Association of Physicists in Medicine; AAPM). CT phantom as the destination by using PSR $9000N^{TM}$ dental CT system (Asahi Roentgen Ind. Co., Ltd., Japan) and i-CAT CBCT (Imaging Science International Inc., USA) that have different kinds of detectors and field of view, and compared these images with the CT number for linear attenuation, contrast resolution, and spatial resolution. Results: CT number of both PSR $9000N^{TM}$ dental CT system and i-CAT CBCT did not conform to the base value of CT performance phantom. The contrast of i-CAT CBCT is higher than that of PSR $9000N^{TM}$ dental CT system. Both contrasts were increased according to thickness of cross section. Spatial resolution and shapes of reappearance was possible up to 0.6 mm in PSR $9000N^{TM}$ dental CT system and up to 1.0 mm in i-CAT CBCT. Low contrast resolution in region of low contrast sensitivity revealed low level at PSR $9000N^{TM}$ dental CT system and i-CAT CBCT. Conclusion: CBCT images revealed higher spatial resolution, however, contrast resolution in region of low contrast sensitivity was the inferiority of image characteristics.

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