• Jae Young Lee, Hyun Hoon Chung, Soo Yeon Kang, Eun-Joo Park, Dong Hyuk Park, Keonho Son, and Joon Koo Han.
• Department of Radiology and the Institute of Radiation Medicine, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea. leejy4u@snu.ac.kr.
• Eur Radiol. 2020 Mar 1; 30 (3): 1554-1563.

ObjectivesTo investigate the efficacy and safety of a new portable ultrasound-guided high-intensity focused ultrasound system (USgHIFU) with advanced targeting and beam steering technology for the treatment of uterine fibroids.MethodsFifty-nine uterine fibroids from 36 participants (mean age, 44.9 ± 4.1 years) were included from November 2013 to November 2015. All participants were treated with HIFU, with 3D electronic steering. MR imaging studies were performed before HIFU, immediately after HIFU, and 1 month and 3 (or 5) months after the HIFU treatment. The non-perfused volume ratio (NPVR), fibroid volume shrinkage (FVS), symptom improvement, quantified life quality assessment, and safety were analyzed. A long-term follow-up was conducted in July to December 2017 (mean, 32.2 months).ResultsThe volume of the treated uterine fibroids ranged from 7.5 to 274.4 cm3 (mean, 69.8 cm3; SD, 64.3 cm3). The mean NPVR on the immediate post-HIFU MR imaging was 74.8 ± 25.2%. The mean FVS was 17.3% at 1 month, 33.3% at 3 months, and 45.1% at 5 months after HIFU treatment. The mean treatment time was 44.6 ± 28.2 min per fibroid and 72.9 ± 31.4 min per participant. Uterine fibroid-related symptoms and quality of life showed statistically significant improvement after the HIFU treatment. No significant symptoms related to safety or complications occurred. In the long-term follow-up, 78.8% of those surveyed were satisfied with their HIFU treatment.ConclusionThis clinical trial showed that a portable USgHIFU with advanced functions may safely and effectively treat uterine fibroids.Key Points• A portable compact ultrasound-guided high-intensity focused ultrasound (HIFU) can effectively and safely treat uterine fibroids. • Advanced functions, such as portability, targeted forecasting, electronic beam steering, and interleaved scanning, might be helpful in enhancing the clinical applicability of ultrasound-guided high-intensity focused ultrasound. • In the long-term follow-up of more than 2 years, approximately 80% of those surveyed were satisfied with their HIFU treatment.

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