Relationship between Quantitativeness of Iodine and Accuracy of Virtual Non-contrast Image in Dual-energy Computed Tomography

Kayano Shingo, Takano Hirokazu, Takane Yumi, Satomura Ayaka, Ono Katsunori, Shimura Hirotaka, Onodera Shu, Sato Kazuhiro

doi:10.6009/jjrt.2019_jsrt_75.3.247

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Dual-energy CT におけるヨードの定量性と仮想単純画像の精度との関係
臨床技術 Dual-energy CTにおけるヨードの定量性と仮想単純画像の精度との関係
リンショウギジュツ Dual-energy CT ニオケルヨードノテイリョウセイトカソウタンジュンガゾウノセイドトノカンケイ

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<p>Dual-energy computed tomography (DE-CT) is the promising technology, such as enabling material decomposition, generation of the virtual monochromatic image, and measurement of effective atomic numbers. There are reports that utilization of the virtual non-contrast (VNC) image, the iodine map image, and the virtual monochromatic image can contribute to the improvement of lesion detection and its characterization, compared with conventional contrast CT by single-energy computed tomography (SE-CT). In addition, acquisition of the VNC images makes it possible to skip scanning of true non-contrast CT, which is also expected to reduce exposure. However, a reliable evaluation of the accuracy of the VNC image has not been established, and only a few reports have verified their accuracy. In this study, we evaluated the relationship between the quantitativeness of iodine and the CT value of VNC image. As a result of our study, when the iodine volume was overestimated, the CT value of the VNC image was lower than the reference value, and when the iodine volume was underestimated, the CT value was upper than the reference value. Moreover, we clarified that the CT value of the VNC image greatly diverges as the iodine volume increases.</p>

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Japanese Journal of Radiological Technology

Japanese Journal of Radiological Technology 75 (3), 247-253, 2019

Japanese Society of Radiological Technology

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