Dual-energy CT iodine quantification for characterizing focal thyroid lesions

Do Hyung Lee, Young Hen Lee, Hyung Suk Seo, Ki Yeol Lee, Sang-Il Suh, Inseon Ryoo, Sung Hye You, Byungjun Kim, Kyung Sook Yang

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Abstract

Background: To determine the usefulness of dual-energy CT (DECT) iodine quantification to classify the focal thyroid lesions. Methods: We retrospectively enrolled a total of 76 cytopathologically confirmed focal thyroid lesions (mean size: 1.9 cm). After drawing a region of interest on the DECT-derived iodine maps, the obtained iodine concentration values of thyroid nodules (IC_N) and normalized IC_N were compared between 3 groups: papillary thyroid carcinoma (PTC), benign nodule, and cyst. Results: From all lesions, 46, 17, and 13 were assigned to the PTC, benign nodule, and cyst groups. IC_N was the highest in the benign nodule, lower in the PTC, and the lowest in the cyst (median [interquartile range]: 4.3 [3.13-5.48], 3.15 [2.29-4.01], 0.60 [0.33-0.88], all P <.001). Similarly, the normalized IC_N values were all statistically different from each other (P <.05).The multi-class area under the curves using the optimal cutoff values were 0.931 for IC_N and 0.918, 0.920 for normalized IC, respectively. Conclusion: DECT iodine quantification could be helpful to classify the focal thyroid lesions.

Original languageEnglish
JournalHead and Neck
DOIs
Publication statusAccepted/In press - 2018 Jan 1

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Keywords

  • CT
  • diagnosis
  • differential
  • dual-energy
  • iodine/analysis
  • thyroid nodule

ASJC Scopus subject areas

  • Otorhinolaryngology

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