Department of Surgery, Division of Plastic and Reconstructive Surgery, University of California, San Diego, CA, USA.
Aesthet Surg J. 2013 Jan;33(1):84-92. doi: 10.1177/1090820X12469807. Epub 2012 Dec 7.
Three-dimensional (3D) digital photography uses integrated image capture technology and rendering software to create 3D models. Volumetric measurements project simulated post-operative images prior to breast augmentation.
To evaluate the accuracy and reproducibility of breast volume measurements using the Portrait 3D Surgical Simulation Platform (Axis Three, Boston, Massachusetts).
Twenty-two patients underwent breast augmentation. 3D volumetric imaging analysis was performed by two independent observers preoperatively and at 6 weeks postoperatively. Simulated volumes were compared to actual implant volume using the Student's t test. Intra-observer reliability was evaluated by measuring internal consistency (Cronbach and 95% confidence interval [CI]) and test-retest reliability (intraclass correlation coefficient [ICC]) from the two observers' calculated volumes.
Half (n = 11) of the patients received silicone implants and half saline; all were placed in the submuscular plane through an inframammary incision. No difference in volume estimation in preoperative or postoperative images (P = .49 and P = .14; and P = 1.0 and P = .37, in right and left breasts, respectively) was observed. The test-retest reliability between observers was excellent (ICC, 0.98; P < .001) and Cronbach's value (0.99; 95% CI 0.97-0.99; P < .001) demonstrated an excellent correlation. Regarding accuracy, difference in volume estimation between actual and simulated volumes varied between 0 to 106 mL (0 - 30%), with an absolute mean difference of 12.2% (42.5 mL).
The Portrait 3D breast imaging system provides a highly reproducible 3D tool for measuring breast volume and simulating breast augmentation. Accuracy of the 3D models can vary up to 30% (mean 12.2%). This variability should be accounted for when using this technology to visually communicate with patients.
三维（3D）数字摄影使用集成的图像采集技术和渲染软件来创建 3D 模型。体积测量可在乳房增大术前预测模拟的术后图像。
评估 Portrait 3D 手术模拟平台（Axis Three，马萨诸塞州波士顿）用于乳房体积测量的准确性和可重复性。
22 例患者接受了乳房增大术。由两名独立观察者术前和术后 6 周进行 3D 体积成像分析。使用学生 t 检验比较模拟体积与实际植入物体积。通过测量两位观察者计算的体积的内部一致性（Cronbach 和 95%置信区间[CI]）和测试-重测可靠性（组内相关系数[ICC]）来评估观察者内的可靠性。
一半（n=11）患者接受了硅胶植入物，另一半接受了盐水植入物；所有患者均通过乳晕下切口置于胸肌下。术前或术后图像的体积估计无差异（P=.49 和 P=.14；右、左乳房 P= 1.0 和 P=.37）。观察者之间的测试-重测可靠性极好（ICC，0.98；P <.001），Cronbach 值（0.99；95%CI 0.97-0.99；P <.001）表明相关性极好。关于准确性，实际和模拟体积之间的体积估计差异在 0 至 106 mL（0-30%）之间，绝对平均差异为 12.2%（42.5 mL）。
Portrait 3D 乳房成像系统提供了一种高度可重复的 3D 工具，用于测量乳房体积和模拟乳房增大。3D 模型的准确性可能在 30%（平均 12.2%）之间变化。在使用该技术与患者进行视觉沟通时，应考虑到这种变异性。
