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http://dx.doi.org/10.17946/JRST.2015.38.4.12

Comparison of Hounsfield Units by Changing in Size of Physical Area and Setting Size o f Region o f Interest b y Using the CT Phantom Made with a 3D Printer  

Seoung, Youl-Hun (Department of Radiological Science, Cheongju University)
Publication Information
Journal of radiological science and technology / v.38, no.4, 2015 , pp. 421-427 More about this Journal
Abstract
In this study, we have observed the change of the Hounsfield (HU) in the alteration of by changing in size of physical area and setting size of region of interest (ROI) at focus on kVp and mAs. Four-channel multi-detector computed tomography was used to get transverse axial scanning images and HU. Three dimensional printer which is type of fused deposition modeling (FDM) was used to produce the Phantom. The structure of the phantom was designed to be a type of cylinder that contains 33 mm, 24 mm, 19 mm, 16 mm, 9 mm size of circle holes that are symmetrically located. It was charged with mixing iodine contrast agent and distilled water in the holes. The images were gained with changing by 90 kVp, 120 kVp, 140 kVp and 50 mAs, 100 mAs, 150 mAs, respectively. The 'image J' was used to get the HU measurement of gained images of ROI. As a result, it was confirmed that kVp affects to HU more than mAs. And it is suggested that the smaller size of physical area, the more decreasing HU even in material of a uniform density and the smaller setting size of ROI, the more increasing HU. Therefore, it is reason that to set maximum ROI within 5 HU is the best way to minimize in the alteration of by changing in size of physical area and setting size of region of interest.
Keywords
3D printer; Region of interest; Hounsfield; Multi-detector computed tomography;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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