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KMID : 1131320150170010171
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Journal of Korean Society of Computed Tomographic Technology
2015 Volume.17 No. 1 p.171 ~ p.178
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Comparative Analysis of Reconstruction Images taken by Changing the ROI site in CT Head Angiography
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Chung Sung-Min
Kang Han-Sol
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Abstract
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Purpose : To evaluate efficiency of Computed tomographic angiography(CTA) image in reconstruction processing throughout changing places of Region of interest(ROI).
Materials and Methods : Data from 30 patients who take CT head angiography examination is used on this study except patients with brain tumor and AVM. All examinations were performed by using Somatom Definition AS 64channel MDCT(Siemens Healthcare, Germany) and Workstation Wizard(Siemens Healthcare, Germany) was used for image reconstruction. Each ROI in head angiography examination is placed CCA and AA. To check the venous phase, CT number of SSS and ICA were measured for comparison analysis.
Results : Average CT number of SSS was 292 HU and ICA was 350 HU when setting on the ROI on CCA. The other side, CT number of SSS was 126 HU and ICA was 338 HU when ROI is on AA. Setting the ROI on AA reduced CT number of SSS by 57% and CT number of ICA by 0.04% compared with the ROI on CCA.
Conclusion : Setting the ROI on AA is more reduced unnecessary venous phase than the ROI on CCA. So that it can make reconstruction process more convenient and clinically useful.
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KEYWORD
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CT head angiography, Common carotid artery, Ascending aorta, ROI
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