New development of computer assisted operation for functional reconstructive surgery after cancer resectio

使用三维曲面形状测量系统（Voxelan、标准型、宽型）和三维图像专用软件程序（3D-Sphinx），对数字化三维表面形状的精度和三维图像的解析方法进行了基础研究。标准型Voxelan的视场尺寸为250 × 235 × 200 mm，宽型为370 × 347 × 300 mm，标准型和宽型的三维数据均方误差分别为0.387 pixel（n=54466）和0.411 pixel（n=76800）。使用旋转平板评估空间角度的平均误差为0.538 ± 0.45度（n=1584）。用1cm的方格纸计算表面积的均方误差为0.115cm^2。临床上我们进行了1）鼻侧壁鼻斜空间角的测量，2）面部形态学分析（使用左右面部图像的叠加图像）和3）面部形态学分析（使用鼻侧壁的鼻斜空间角测量）。 ...更多信息 使用面部标志的三维坐标进行运动分析。1)对同一名志愿者重复测量5次，标准型鼻倾角的准确度为：左侧57.5 ± 0.5度，右侧59.0 ± 0.6度;左侧57.9 ± 5.6度，右侧58.2 ± 1.2度。鼻骨骨折后歪鼻畸形的鼻形分析是有价值的。2)应用图像叠加分析技术对上颌窦癌后颊部缺损进行评价，计算缺损深度和重建面积。3)三维坐标分析有助于听神经瘤切除术后面神经麻痹的功能重建，并可应用游离肌瓣进行口部运动重建，证实计算机辅助术前评估对恶性肿瘤切除术后的功能重建手术是非常有用的。少

We performed basic researches on the accuracy of digitized three-dimensional surface shape and how to analyze three-dimensional images using the three-dimensional curve shape measurement system (Voxelan, standard type and wide type) and a software program specially designed for three-dimensional images (3D-Sphinx). The standard type of Voxelan can measure 250x235x200mm in field and the wide type 370x347x300mm.The mean error squared of three-dimensional data was evaluated using a flat board and was 0.387 pixel (n=54466) in the standard type and 0.411 pixel (n=76800) in the wide type. The mean error of spatial angle was evaluated using a rotated flat board and was 0.538 +/- 0.45 degree (n=1584). The mean error squared of surface area was calculated using squared paper of 1 cm and was 0.115 cm^2.Clinically we performed 1) measurement of spatial angle of nasal slope in lateral nasal wall, 2) facial morphological analysis using superimposed images of right and left facial images and 3) faci … More al movement analysis using three-dimensional coordinates of facial landmarks. 1) The accuracy of angle of nasal slope was measured repeatedly 5 times in a same volunteer and were 57.5 +/- 0.5 degree on the left side of lateral nasal wall and 59.0 +/- 0.6 degree on the right side using the standard type and 57.9 +/- 5.6 degree on the left side and 58.2 +/- 1.2 degree on the right side. The nasal shape analysis was useful for deviated nose after nasal bone fracture. 2) The superimposed image analysis was useful for the evalation of the cheek defect after maxillary sinus cancer and the depth and the surface area to be reconstructed was calculated. 3) The analysis of three-dimensional coordinates was useful for the facial nerve paralysis after an acoustic tumor resection to be reconstructed on the movement of mouth using free muscle flap.We conformed that computer assisted pre-operative evaluation was extremely useful for the fuctional reconstructive surgery after malignant tumor resection. Less