21 research outputs found

    3D Symmetry Measure Invariant to Subject Pose During Image Acquisition

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    In this study we evaluate the influence of subject pose during image acquisition on quantitative analysis of breast morphology. Three (3D) and two-dimensional (2D) images of the torso of 12 female subjects in two different poses; (1) hands-on-hip (HH) and (2) hands-down (HD) were obtained. In order to quantify the effect of pose, we introduce a new measure; the 3D pBRA (Percentage Breast Retraction Assessment) index, and validate its use against the 2D pBRA index. Our data suggests that the 3D pBRA index is linearly correlated with the 2D counterpart for both of the poses, and is independent of the localization of fiducial points within a tolerance limit of 7 mm. The quantitative assessment of 3D asymmetry was found to be invariant of subject pose. This study further corroborates the advantages of 3D stereophotogrammetry over 2D photography. Problems with pose that are inherent in 2D photographs are avoided and fiducial point identification is made easier by being able to panoramically rotate the 3D surface enabling views from any desired angle

    An Aesthetic Factor Priority List of the Female Breast in Scandinavian Subjects

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    Background: There is little consensus about the relative determinative value of each individual factor in female breast aesthetics. When performing breast surgery with an aesthetic goal, certain factors will be more important than others. The purpose of this study was to make an aesthetic factor rank list to determine the relative contributions to overall breast aesthetics. Method: Volunteers were scanned using the 3-dimensional Vectra system. Ten Scandinavian plastic surgeons rated 37 subjects, using a validated scoring system with 49 scoring items. The correlation between specific aesthetic factors and overall breast aesthetic scores of the subjects were calculated using Pearson's r, Spearman's rho, and Kendall's tau. Results: A very strong correlation was found between overall breast aesthetic score and lower pole shape (0.876, P <0.0001). This was also true for upper pole shape (0.826, P <0.0001) and breast height (0.821, P <0.0001). A strong correlation was found between overall breast aesthetic score and nipple position (0.733, P <0.0001), breast size (0.644, P <0.0001), and breast width (0.632, P <0.0001). Factors that were only moderately correlated with aesthetic score were intermammary distance (0.496, P = 0.002), nipple size and projection (0.588, P <0.0001), areolar diameter (0.484, P <0.0001), and areolar shape (0.403, P <0.0001). Perceived symmetry was a weak factor (0.363, P = 0.027). Conclusions: Aesthetic factors of the female breast can be ranked in a priority list. Shape of the lower pole and upper pole and breast height are primary factors of female breast aesthetics. These should be prioritized in any aesthetic breast surgery. Vertical dimensional factors seem to be more determinative than horizontal factors.Peer reviewe

    A structured-light surface scanning system to evaluate breast morphology in standing and supine positions

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    Objective and accurate surface measurements of the human breast are important for surgical planning and outcome assessment. Breast shapes are affected by gravitational loads and deformities, and the measurements obtained in the standing position may not correlate well with measurements in supine position, which is more representative of breast surgery. To evaluate the effect of changes in body posture on breast morphology, a dual color 3D surface imaging system capable of scanning patients in both the supine and standing positions was developed. System performance was established by assessing the surface coverage and accuracy between a CAD breast model and 3D surface scans of a 3D print of the CAD model. The modular nature of the system offers the potential to add additional surface scanners with unique colors to increase coverage without sacrificing speed. The human pilot study shows that the system can quantitatively evaluate the effect of subject postures in individuals with smaller breasts, and thereby has the potential to be used to investigate changes in breast morphologies
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