EVALUATION OF NEW ALGORITHMS FOR THE INTERACTIVE MEASUREMENT OF SURFACE-AREA AND VOLUME
EVALUATION OF NEW ALGORITHMS FOR THE INTERACTIVE MEASUREMENT OF SURFACE-AREA AND VOLUME
复制标题
DOI：
10.1118/1.597333
复制
发表时间：
1994-06-01
期刊：
影响因子：
3.8
通讯作者：
FOX, PT
中科院分区：
文献类型：
--
作者：
ALYASSIN, AM;LANCASTER, JL;FOX, PT
评价了用于表面积测量的最大单位法向分量法（MUNC）和用于体积测量的散度定理算法（DTA）。在不同的信噪比、采样、空间平均和方向下，研究了这些方法的准确性和精密度。对于7个球形样品，MUNC测量表面积的精度为2.0%，信噪比为5:1 ~ 39:1。这些样品的变异百分率（% CV）表明，其精度小于3.0%。同样，DTA测定体积的准确度和精密度均小于1.0%。对木质球体（51.44 mm直径）的23个计算机断层扫描（CT）图像样本进行MUNC表面积测量，x，y体素尺寸范围为1至10 mm， z体素尺寸范围为2至14 mm，准确度为1.3%，精度为2.2%。对18个x，y元音尺寸范围为1 ~ 8mm， z尺寸范围为2 ~ 14mm的木球样品进行DTA体积测量，精度为1.2%，精度为1.8%。CT扫描柱状杆的五个不同方向（从每个轴到所有三个轴之间）的表面积测量精度为3.7%，精度为2.0%。用差热分析方法测量圆柱杆的体积，这些方向的精度为4.0%，精度为3.7%。DTA测量的体积与改进的体素计数法测量的体积比较好。MUNC表面积法优于表面体素计数法。使用配对切割平面选择半径为25像素的计算机生成球体的子集，五种交互表面积和体积测量的准确度和精度均低于1.0%。
The maximum unit normal component (MUNC) method used for surface area measurement and the divergence theorem algorithm (DTA) used for volume measurement were evaluated. The accuracy and precision of these methods were investigated at varying signal-to-noise ratios (SNRs), sampling, spatial averaging, and orientation. The accuracy of the MUNC measured surface area, as indicated by the mean error, was 2.0% for seven spherical samples, with SNRs ranging from 5:1 to 39:1. The precision, as indicated by the percent coefficient of variation (% CV) for these samples, was less than 3.0%. Likewise, the accuracy and precision of the DTA measured volume for these samples were both less than 1.0%. MUNC surface area measurement from 23 samples of a computed tomography (CT) image of a wooden sphere (51.44-mm diameter) with x,y voxel size ranging from 1 to 10 mm and z voxel size ranging from 2 to 14 mm yielded an accuracy of 1.3% and a precision of 2.2%. The DTA volume measurements from 18 samples of the wooden sphere with x,y vowel size ranging from 1 to 8 mm and z size ranging from 2 to 14 mm provided an accuracy of 1.2% and a precision of 1.8%. Measurement of surface area for a cylindrical rod scanned by CT in five different orientations, ranging from along each axis to between all three axes, yielded an accuracy of 3.7% and a precision of 2.0%. The volume of the cylindrical rod measured by the DTA method for these orientations produced an accuracy of 4.0% and a precision of 3.7%. The volume measured by DTA compared well with the volume measured by a modified voxel counting method. The MUNC surface area method was superior to counting surface voxels. The accuracy and precision for five interactive surface area and volume measurements, using paired cut planes to select subsets of a computer-generated sphere with radius 25 pixels, were both less than 1.0%.