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KMID : 0896020070370040205
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Korean Journal of Oral and Maxillofacial Radiology
2007 Volume.37 No. 4 p.205 ~ p.209
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Characteristics of a new cone beam computed tomography
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Park Chang-Se
Kim Kee-Deog
Park Hyok
Jeong Ho-Gul
Lee Sang-Chul
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Abstract
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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.
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KEYWORD
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Tomography, Cone Beam Computed, Flat panel, MTF, NPS, DQE, SNR
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