The measurement errors on various marker positions with VECTRA H1 and the breast model

Using a female breast model, Three, 5, or 7 markers were attached when photographing with VECTRA H1, with lateral markers 6 cm from the midline. Five markers were configured in two ways, with the lateral markers either positioned 3 cm outside the midline (narrow) or 9 cm outside the midline (wide). Models were created three times under each condition, for a total of 15 models. Differences (measurement error) between measured values on 3D models and actual measured values on the physical model were verified for six distances, such as distance between the nipples. X: Sternal angle; Y: intersection of right anterior axillary line and Inframammary fold; Z: intersection of left anterior axillary line and breast descending line; N(r): right nipple; N(l): left nipples,

本研究采用女性乳房模型（female breast model），使用VECTRA H1设备进行拍摄时，需粘贴3个、5个或7个标记点，其中外侧标记点距身体中线6厘米。针对5个标记点的配置，设置了两种布局方案：外侧标记点分别位于中线外侧3厘米（窄间距模式）或9厘米（宽间距模式）。每种实验条件下均重复构建3次模型，总计生成15个模型。针对乳头间距等6项距离指标，验证了3D模型测量值与实体物理模型实际测量值之间的差异（测量误差（measurement error））。各标记点定义如下：X：胸骨角（Sternal angle）；Y：右腋前线（right anterior axillary line）与乳房下皱襞（Inframammary fold）的交点；Z：左腋前线（left anterior axillary line）与乳房下行线（breast descending line）的交点；N(r)：右侧乳头；N(l)：左侧乳头。