The accuracy of ventricular volume measurement and the optimal slice thickness by using multislice helical computed tomography 計算心室容積的準(zhǔn)確性及最佳層厚選擇
A distal femur of a pig was scanned with picker 6000 sct with 1 . 0 slice thickness and pitch of 1 . 5 , and the data obtained were treated in voxel q image workstation for 3d reconstruction with volume rendering technique 研究采用豬為實驗動物進(jìn)行可行性研究。用pq6000螺旋ct對豬股骨進(jìn)行層厚1mm ,螺距1mm掃描,然后進(jìn)行容積三維重建。
The surface ladder effect produced by prototyping principle is analyzed , and the calculation method of the part surface roughness is presented . the selecting method of slice thickness and sintering layer thickness when slicing the cad model and sintering is presented 分析了由于成型原理所產(chǎn)生的制件表面階梯效應(yīng),提出了制件表面粗糙度的計算方法,給出了cad模型切片時,切片厚度的選取方法。
Modeling surface is approached by stair up of lines in the current lom process , so theoretical manufacturing error and remaining material quantity are greater . the higher precision and lower remaining material quantity are ensured by using the thinner slicing thickness 本文指出現(xiàn)有l(wèi)om方法由于用直線臺階逼近造型曲面,因而原理加工誤差大,殘留加工量多,必須使用較薄的分層厚度來保證較高的造型精度和較小的殘留光整加工量。