Korean J Oral Maxillofac Radiol.  2007 Dec;37(4):205-209.

Characteristics of a new cone beam computed tomography

• Park CS
• Kim KD
• Park H
• Jeong HG
• Lee SC

Abstract

PURPOSE: To determine the physical properties of a newly developed cone beam computed tomography (CBCT).
MATERIALS AND 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.

Keyword

Tomography, Cone Beam Computed; Flat panel; MTF; NPS; DQE; SNR

MeSH Terms

Cone-Beam Computed Tomography*
Noise
Tomography, Spiral Computed