방사선의학 웹진

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Abstract
Background: Hybrid single-photon emission computed tomography (SPECT)/computed tomography (CT) is used for the differential diagnosis of thyrotoxicosis, but its dependence on CT and complex analysis remains debated. This study evaluated whether CT-free thyroid SPECT using artificial intelligence (AI) could substitute for conventional SPECT/CT.

Methods: This prospective multicenter noninferiority clinical trial (KCT0008387) included 152 patients with thyrotoxicosis from three tertiary referral hospitals. A pretrained AI model generated technetium thyroid uptake (TcTU) values using SPECT images without CT. These values were compared with TcTU derived from conventional SPECT/CT. The primary endpoint was diagnostic accuracy for Graves' disease. Noninferiority was defined as a lower confidence interval (CI) limit greater than -10%. Secondary endpoints included diagnostic accuracy for destructive thyroiditis and prediction of antithyroid drug (ATD) prescription within one month.

Results: Among 152 patients, 84 had Graves' disease, 45 had indeterminate disease, and 23 had thyroiditis. For Graves' disease, CT-free SPECT demonstrated 86.2% accuracy compared with 85.5% for conventional SPECT/CT. The lower bound of the CI of the accuracy difference was -3.0%, meeting the prespecified noninferiority margin. For thyroiditis and ATD prescription, the lower bounds were -7.4% and -3.2%, respectively. Omission of CT resulted in a 33.5% reduction of radiation exposure from 3.34 mSv to 2.22 mSv, and CT-free SPECT automatically generated TcTU values more quickly than SPECT/CT (40 minutes vs. 4 minutes).

Conclusions: CT-free SPECT using AI demonstrated noninferior diagnostic performance for thyrotoxicosis compared with conventional hybrid imaging while reducing radiation exposure and analysis time.

Affiliations

Hyun Woo Chung 1, Sang-Geon Cho 2, Dongkyu Oh 3 4, Kyounghyoun Kwon 5, Ji Hye Kim 3, Young So 1, Jae Hoon Moon 6, Soyeon Ahn 7, Won Woo Lee 3 4 8 9; K-SPECT Group
1Department of Nuclear Medicine, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Republic of Korea.
2Department of Nuclear Medicine, Chonnam National University Hospital and Medical School, Gwangju, Republic of Korea.
3Department of Nuclear Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.
4Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea.
5BioDrone Research Institute, MDimune Inc., Seoul, Republic of Korea.
6Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.
7Medical Research Collaborating Center, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.
8Institute of Radiation Medicine, Medical Research Center, Seoul National University, Seoul, Republic of Korea.
9Department of Health Science and Technology, The Graduate School of Convergence Science and Technology, Seoul National University, Suwon, Republic of Korea.