Abstract：
BACKGROUND: Crow\'s feet are bilateral orbital wrinkles formed by the orbital portion of the orbicularis oculi muscle, which is the target muscle for botulinum neurotoxin (BoNT) injection.
OBJECTIVE: This study\'s aim was to demonstrate a novel BoNT injection guideline by assessing muscle width, thickness, and dynamic features using ultrasonography.
METHODS: Twenty healthy Korean volunteers (10 men, 10 women; mean age, 25.6) participated. The width, thickness, and dynamic movement of the orbicularis oculi muscle were measured using ultrasonography. Two volunteers were selected to receive BoNT injections. Injections were administered using a novel method with two curved reference lines passing a point 15 mm lateral to the lateral canthus (conventional injection) and a point 5 mm lateral to the lateral margin of the frontal process of zygomatic bone (additional injection).
RESULTS: At the lateral canthus level, the distance between the lateral margin of the frontal process and the most lateral margin of the orbicularis oculi muscle was 12.5 ± 1.3 mm. The thickness of the orbicularis oculi muscle at the midpoint of the frontal process, the lateral marginal of the frontal process, and 5 mm lateral to the lateral marginal of the frontal process was 0.7 ± 0.3 mm, 1.1 ± 0.3 mm, and 1.2 ± 0.3 mm, respectively. The crow\'s feet of the two volunteers began to disappear from day 3 and completely disappeared on day 7 after the injection.
CONCLUSIONS: The novel injection technique based on the ultrasonographic anatomy resulted in improvements in the appearance of crow\'s feet.
OBJECTIVE: This study\'s aim was to demonstrate a novel BoNT injection guideline by assessing muscle width, thickness, and dynamic features using ultrasonography.
METHODS: Twenty healthy Korean volunteers (10 men, 10 women; mean age, 25.6) participated. The width, thickness, and dynamic movement of the orbicularis oculi muscle were measured using ultrasonography. Two volunteers were selected to receive BoNT injections. Injections were administered using a novel method with two curved reference lines passing a point 15 mm lateral to the lateral canthus (conventional injection) and a point 5 mm lateral to the lateral margin of the frontal process of zygomatic bone (additional injection).
RESULTS: At the lateral canthus level, the distance between the lateral margin of the frontal process and the most lateral margin of the orbicularis oculi muscle was 12.5 ± 1.3 mm. The thickness of the orbicularis oculi muscle at the midpoint of the frontal process, the lateral marginal of the frontal process, and 5 mm lateral to the lateral marginal of the frontal process was 0.7 ± 0.3 mm, 1.1 ± 0.3 mm, and 1.2 ± 0.3 mm, respectively. The crow\'s feet of the two volunteers began to disappear from day 3 and completely disappeared on day 7 after the injection.
CONCLUSIONS: The novel injection technique based on the ultrasonographic anatomy resulted in improvements in the appearance of crow\'s feet.
摘要：
背景：乌鸦脚是由眼轮匝肌的眼眶部分形成的双侧眼眶皱纹，它是肉毒神经毒素（BoNT）注射的目标肌肉。
目的：这项研究的目的是通过评估肌肉宽度来证明一种新的BoNT注射指南，厚度,和超声检查的动态特征。
方法：20名健康的韩国志愿者（10名男性，10名妇女；平均年龄，25.6)参与。宽度，厚度,使用超声测量眼轮匝肌的动态运动。选择两名志愿者接受BoNT注射。使用一种新颖的方法进行注射，该方法具有两条弯曲的参考线，该参考线在外侧can骨外侧15mm的点（常规注射）和在the骨额骨的额叶缘外侧5mm的点（额外注射）。
结果：在侧眼角水平，额突外侧缘与眼轮匝肌最外侧缘之间的距离为12.5±1.3mm。额突中点的眼轮匝肌厚度，额叶过程的横向边缘，额叶过程横向边缘的5毫米为0.7±0.3毫米，1.1±0.3mm,和1.2±0.3毫米，分别。两名志愿者的乌鸦脚从第3天开始消失,并在注射后第7天完全消失。
结论：基于超声解剖的新型注射技术改善了乌鸦脚的外观。
目的：这项研究的目的是通过评估肌肉宽度来证明一种新的BoNT注射指南，厚度,和超声检查的动态特征。
方法：20名健康的韩国志愿者（10名男性，10名妇女；平均年龄，25.6)参与。宽度，厚度,使用超声测量眼轮匝肌的动态运动。选择两名志愿者接受BoNT注射。使用一种新颖的方法进行注射，该方法具有两条弯曲的参考线，该参考线在外侧can骨外侧15mm的点（常规注射）和在the骨额骨的额叶缘外侧5mm的点（额外注射）。
结果：在侧眼角水平，额突外侧缘与眼轮匝肌最外侧缘之间的距离为12.5±1.3mm。额突中点的眼轮匝肌厚度，额叶过程的横向边缘，额叶过程横向边缘的5毫米为0.7±0.3毫米，1.1±0.3mm,和1.2±0.3毫米，分别。两名志愿者的乌鸦脚从第3天开始消失,并在注射后第7天完全消失。
结论：基于超声解剖的新型注射技术改善了乌鸦脚的外观。
