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KMID : 1149020190210020023
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Journal of Korean Society of Computed Tomographic Technology
2019 Volume.21 No. 2 p.23 ~ p.30
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Usefulness of algorithm modification by contrast media reduction in Head and Neck CT evaluation
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Kim Hye-Eun
Jung Jae-Yeon
Kim Tae-Yong
Kim Sang-Gyun
Im Sang-Muk
Kim Eun-Seong
Lee Kwang-Won
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Abstract
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Purpose: To identify the usefulness of contrast media reduction through algorithm modification in Head and Neck CT evaluation by comparing the quality of two images.
Objects and methods: The study was conducted on 66 patients with head and neck CT at SOMATOM Sensation 16. This study performed conventional algorithm (B45f image, scaned after 60 sec, infusing 100 ml contrast media) and modified algorithm. (H45s image, scanned after 60 sec, infusing 70 ml contrast media) Measured the Mean of Hounsfield Unit by establishing 15mm2 of the ROI from two Internal Jugular veins and Thyroid. For qualitative evaluation, were performed by two radiologists who read head and neck images to assess the quality of contrast images and artifact images.
Results: In the P-value of internal jugular vein(P=0.776) and Thyroid(P=0.425), were 0.05 or higher. Which indicates that there is no difference between preexisting image and image after algorithm modification was accepted. In the qualitative evaluation, the improved contrast image evaluation kappa coefficient was 0.639, and the kappa coefficient as the evaluation result was 0.666. Bothevaluations showed substantial agreement.
Conclusion: Quantitative and qualitative analysis showed Image quality was not degraded after 30% reduction of contrast agent usage. Reducing contrast agents can reduce the side effects of contrast agents, such as kidney dysfunction and other side effects.
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KEYWORD
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Head & Neck CT, Algorithm, Contrast media
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