CH Dermatologia, Medellin, Colombia.
Independent Photographer, Medellin, Colombia.
Aesthetic Plast Surg. 2021 Dec;45(6):2751-2759. doi: 10.1007/s00266-021-02314-3. Epub 2021 May 13.
2D baseline and follow-up clinical images are potentially subject to inconsistency due to alteration of imaging parameters. However, no study to date has attempted to quantify the magnitude by which such images can be influenced.
The objective of the present study is to identify the magnitude by which images can be influenced by changing the imaging light angle.
This study is based on the evaluation of 2D frontal images of the face and included a total of 51 subjects of which n = 14 were males and n = 37 were females. Faces were photographed at 0°, 30°, and 60° light angle under identical and standardized conditions. Images were randomized and rated by 27 blinded raters for age, facial attractiveness, body mass index (BMI), temporal hollowing, lower cheek fullness, nasolabial sulcus severity, and jawline contour.
Facial attractiveness decreased, facial unattractiveness increased and the evaluated BMI (based on facial assessment) increased statistically significantly at 60°. The assessment of regional facial scores, i.e., temporal hollowing, lower cheek fullness, and jawline contour, showed no statistically meaningful changes both at 30° and at 60° light angle.
The results indicate that there might be an observed blind range in light angle (0°-30°) which does not influence facial assessment. Increasing the light angle past the threshold value to 60° might result in a statistically significant impact on facial perception which should be accounted for when documenting and/or presenting facial 2D images.
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二维基线和随访临床图像可能由于成像参数的改变而不一致。然而，迄今为止，尚无研究试图量化这些图像受影响的程度。
本研究的目的是确定改变成像光角对图像影响的程度。
本研究基于对面部的二维正面图像的评估，共纳入了 51 名受试者，其中 n=14 名男性，n=37 名女性。在相同和标准化的条件下，以 0°、30°和 60°的光角拍摄面部照片。在随机和盲法条件下，由 27 名评分者对图像进行年龄、面部吸引力、体重指数（BMI）、颞部凹陷、面颊饱满度、鼻唇沟严重程度和下颌线轮廓的评估。
在 60°时，面部吸引力降低，不吸引力增加，基于面部评估的 BMI 增加具有统计学意义。30°和 60°光角时，区域面部评分（即颞部凹陷、面颊饱满度和下颌线轮廓）的评估无统计学意义的变化。
结果表明，在光角（0°-30°）范围内可能存在观察盲区，不会影响面部评估。将光角增加超过阈值（60°）可能会对面部感知产生统计学上的显著影响，在记录和/或呈现面部二维图像时应考虑到这一点。
证据等级 V：本杂志要求作者为每篇文章指定一个证据等级。有关这些循证医学评级的完整描述，请参考目录或在线作者指南 www.springer.com/00266 。
