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. 2016 Nov 8;17(6):421-428.
doi: 10.1120/jacmp.v17i6.6402.

Accuracy of automatic matching of Catphan 504 phantom in cone-beam computed tomography for tube current-exposure time product

Hui-Su Won  1 , Jin-Beom Chung, Byung-Don Choi, Jin-Hong Park, Do-Guwn Hwang
Affiliations

Accuracy of automatic matching of Catphan 504 phantom in cone-beam computed tomography for tube current-exposure time product

Hui-Su Won et al. J Appl Clin Med Phys. .

Abstract

The purpose of this study is to evaluate the accuracy of automatic matching in cone-beam computed tomography (CBCT) images relative to the reduction of total tube current-exposure time product (mAs) for the X-ray imaging (XI) system. The CBCT images were acquired with the Catphan 504 phantom various total mAs ratios such as 1.00, 0.83, 0.67, 0.57, and 0.50. For studying the automatic match-ing accuracy, the phantom images were acquired with a six-dimensional shifting table. The image quality and correction of automatic matching were compared. With a decreasing total mAs ratio, the noise of the images increased and the low-contrast resolution decreased, while the accuracy of the automatic matching did not change. Therefore, this study shows that a change of the total mAs while acquiring CBCT images has no effect on the automatic matching of Catphan 504 phantom in XI system.

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Figures

Figure 1
Figure 1
kV CBCT images of Catphan 504 phantom: (a) the sensitometry module, (b) the uniformity module, and (c) the low‐contrast module.
Figure 2
Figure 2
The mean values of the noises in the Catphan 504 with varying total mAs ratios.
See this image and copyright information in PMC

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