Journal
ULTRASOUND IN MEDICINE AND BIOLOGY
Volume 45, Issue 10, Pages 2641-2648Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ultrasmedbio.2019.06.414
Keywords
Ultrasonography; Botulinum toxin type A; Forehead; Frontalis; Soft tissue thickness
Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [NRF-2017 R1 A2 B4003781]
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Botulinum toxin type A (BoNT-A) injections in the forehead region should only target the frontalis. This study applied ultrasonography with the aim of providing guidelines for predicting the layered structure and soft-tissue thickness of the forehead. We performed ultrasound scanning at 7 facial landmarks in 40 Korean adults. Allowing for the error range, the minimum depth from the skin to exclude the muscle layer was 2.3 mm, and the maximum depth from the skin to include the muscle layer was 2.8 mm. Of the total 7 points from the skin to muscle surface, significant differences between the males and females were found in 6 points (p < 0.05). Clinicians can use ultrasonography to identify the structural layers of the scalp. Even if ultrasound-guided injections are not performed, it is possible to target only muscle layers in BoNT-A injections by maintaining a needle depth of around 2.5 mm. (C) 2019 The Author(s). Published by Elsevier Inc. on behalf of World Federation for Ultrasound in Medicine & Biology.
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