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Three-dimensional surface imaging (3D-SI) of the breasts enables the measurement of anthropometric distances and breast volume. These measurements may be used in surgical planning and to facilitate clear communication with patients. The aim of this study was to compare measurements using a portable 3D-SI system, Crisalix, with a more established non-mobile camera, the VECTRA XT.
Participants were imaged three times using the Crisalix and the VECTRA XT system. Breast volume, sternal notch to nipple distance, nipple to nipple distance and breast width were measured. Intra-observer agreement was measured using the co-efficient of variation (CV). Agreement between the two methods was represented with Bland Altman agreement plots.
Intra-method variation was low for both methods (maximum CV 3.3% for Crisalix and 3.2% for VECTRA XT), with only nipple-to-nipple distance being statistically significant, marginally in favour of VECTRA. The mean inter-method differences were small but the limits of agreement (LoA) were wide for all parameters: best for sternal notch to nipple distance, mean difference (MD) -0.03cm and LoA 1.8 to -1.8cm; the widest LoA were for breast volume: MD 31.1cm3 and LoA 286.7 to -244.6cm3.
This is the first comparison of anthropometric distances and breast volume measured using the two most widely used 3D-SI systems, Crisalix and VECTRA XT. Intra-method variation is low but currently it would not be appropriate to use the two systems interchangeably due to the wide limits of agreement for all four parameters assessed.
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