Study On Breast Volume Measurement Based On Three-Dimensional Scanning

Background: In breast plastic surgery,a significant proportion are breast augmentation and breast reduction surgery,both of which involve volume changes,and it is necessary to obtain objective data on the patient’s breast volume.In previous clinical work,there are many methods to measure breast volume,mainly including: 1.Archimedes method;2.casting method;3.mammography;4.Grossman-Roudner method;5.anatomy(anthropometry);6.computed tomography(CT);7.magnetic resonance imaging(MRI)scan;8.three-dimensional scan(3D);9.direct measurement of surgical specimens.However,they are not routinely used in clinical practice due to either high cost,technical difficulties,or patient discomfort.Three-dimensional laser scanning is a good choice for breast volume measurement because of its simplicity,rapidity,low price and high patient acceptance compared with other methods.Objective: To evaluate the reliability and repeatability of breast volume measurement by three-dimensional laser scanning of F6 SMART hand-held non-contact laser scanner,compare the difference between this technology and magnetic resonance(MRI)calculated breast volume,so as to verify and whether three-dimensional laser scanning can accurately predict the reliability of breast volume measurement by magnetic resonance measurement.Methods:1.The subject is placed in the standing position,the data are obtained through Echo software with an F6 SMART hand-held non-contact laser scanner,the breast measurement boundary is manually marked,and the image is processed with Geomagic Wrap2021 software to obtain the measured breast volume data.2.Verify the repeatability of breast volume measurement by threedimensional laser scanning: 31 women were selected and threedimensional laser scanning was performed.62 breasts of 31 subjects were scanned by 2 measurers.Each measurer repeated the measurement of each breast for 3 times(n = 372).The obtained data were analyzed by repeated measures analysis of variance to detect the intra-measurer differences;the statistical method of intraclass correlation coefficient(ICC)and BlandAltman diagram were used to evaluate the reliability and consistency between measurers.3.To verify the reliability of three-dimensional laser scanning in measuring breast volume: 51 women who underwent simultaneous breast magnetic resonance scanning and three-dimensional laser scanning were selected to obtain breast volume.Magnetic resonance scanning was performed with MIPAV software to process image magnetic resonance scanning images,and three-dimensional laser scanning images were processed with Geomagic Wrap2021 to calculate breast volume,respectively.SPSS 26.0 was used for statistical analysis,Graphpad Prism9 was used for data analysis,paired sample T-test was used to analyze the difference of breast volume calculated by the two methods,the statistical method of intraclass correlation coefficient(ICC)and Bland-Altman plot were used to analyze the reliability and consistency of the two methods,Pearson test was used to test the degree of correlation between the two measurement techniques,scatter plot was used to visually analyze the correlation between the two methods,and the linear regression equation was calculated.Results:1.The ICC value between the two measurers was 0.996,and the measurement results were highly consistent;the P > 0.05 of the results of the three measurements for each measurer was not statistically different.2.The mean(SD)breast volume measured using a three-dimensional laser scan was 376.43 ml(226.95 ml),and the mean(SD)breast volume measured using MRI was 454.69 ml(236.78 ml).These data,although significantly different,could find a linear correlation,where,R2 = 0.83,y(MRI)= 0.95 ×(3D)+ 97.95.The ICC of breast volume measured by threedimensional laser scanning and magnetic resonance was 0.859,showing good reliability and consistency.Conclusion:1.Three-dimensional laser scanning measurement of breast volume is reproducible,.2.Breast volume values measured by three-dimensional laser scanning are lower than those measured by MRI.However,threedimensional laser measurement scans have an extremely high linear correlation with breast volume data obtained by MRI,making them an objective and reproducible measurement method suitable for clinical practice.