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KMID : 0896020070370030157
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Korean Journal of Oral and Maxillofacial Radiology
2007 Volume.37 No. 3 p.157 ~ p.163
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Image characteristics of cone beam computed tomography using a CT performance phantom
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Han Choong-Wan
Kim Gyu-Tae
Choi Yong-Suk
Hwang Eui-Hwan
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Abstract
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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 9000NTM 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 9000NTM 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 9000NTM 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 9000NTM 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 9000NTM 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. (Korean J Oral Maxillofac Radiol 2007; 37 : 157-63)
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KEYWORD
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Radiography, Dental, Tomography, X-ray Computed, Phantoms, Imaging
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