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KMID : 1149020180200010067
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Journal of Korean Society of Computed Tomographic Technology
2018 Volume.20 No. 1 p.67 ~ p.76
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Comparison of usefulness according to dose and change of substance, using Dual energy CT and Spectral CT
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Lee Sang-Gil
Lee Seong-Ju
Jeong Heon-Jeong
Kim Dong-Seong
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Abstract
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Purpose: This paper is written to compare usefulness of mono-Energy images related to radiation dose, iodine content concentration, and various substances, using Spectral CT and Dual energy CT.
Material and method: The equipment used in this study is the SIEMENS 192 (384) Channel Dual source SOMATOM Force and the Philips IQon Spectral CT. The phantom used in this experiment is Tissue Characterization Phantom (Gammex467) which represents tissue equivalent material. In the same circumstance for both equipment, helical scan was performed with increased CTDIvol such as 20 mGy, 30 mGy, 40 mGy. Also, Phantom for comparison according to contrast agent concentration was prepared by mixing 2.5 mgI/mL, 5 mgI/mL and 7 mgI/mL, 10 mgI/mL 15 mgI/mL of each iodine with normal saline to have 50 ml of total volume. The Tissue Characterization Phantom and the phantom for contrast agent comparison were scanned by the equipment from SIEMENS and Philips. This study evaluated Hounsfield Unit (HU) values obtained from them on monoE image sat from 40 keV to 100 keV.
Result: When the tissue phantom and the contrast agent Phantom were examined by CTDIvol changes, HU values at the level of various monoE[keV] were not significantly changed. Also, the similar results was obtained from using both equipment. As the level of monoE[keV] increased from40 keV to 100 keV, the substances with lower CT number such as water and liver showed less variation of HU values than other tissues. However, comparing iodine, CB2 Resin-30 % CaCO3 and CB2 Resin-50 % CaCO3, the results of HU values significantly changed, as the level of monoE[keV] increased from 40 keV to 100 keV with both equipment.
Conclusion: HU values obtained from various monoE[keV] images in Dual energy CT and Spectral CT indicated almost same. In the clinical applications, the use of monoE[keV] images is expected to broaden the range of diagnosis by helping to detect the differences between soft tissues and substances containing calcium such as stone.
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KEYWORD
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MonoE[keV], CTDIvo
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