Characteristics of a new cone beam computed tomography
박창서, 김기덕, 박혁, 정호걸, 이상철,
소속 상세정보
박창서 ( Park Chang-Se ) - 연세대학교 치과대학 구강악안면방사선학교실
김기덕 ( Kim Kee-Deog ) - 연세대학교 치과대학 구강악안면방사선학교실
박혁 ( Park Hyok ) - 연세대학교 치과대학 구강악안면방사선학교실
정호걸 ( Jeong Ho-Gul ) - 연세대학교 치과대학 구강악안면방사선학교실
이상철 ( Lee Sang-Chul ) - 연세대학교 치과대학 구강악안면방사선학교실
KMID : 0896020070370040205
Abstract
Purpose : To determine the physical properties of a newly developed cone beam computed tomography (CBCT).
Materials & Methods : We measured and compared the imaging properties for the indirect-type flat panel
detector (FPD) of a new CBCT and the single detector array (SDA) of conventional helical CT (CHCT).
Results : First, the modulation transfer function (MTF) of the CBCT were superior to those of the CHCT. Second,
the noise power spectrum (NPS) of the CBCT were worse than those of the CHCT. Third, detective quantum
efficiency (DQE) of the indirect-type CBCT were worse than those of the CHCT at lower spatial frequencies, but
were better at higher spatial frequencies. Although the comparison of contrast-to-noise ratio (CNR) was estimated in the limited range of tube current, CNR of CBCT were worse than those of CHCT.
Conclusion : This study shows that the indirect-type FPD system may be useful as a CBCT detector because of
high resolution.
키워드
Tomography; Cone Beam Computed; Flat panel; MTF; NPS; DQE; SNR
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