CAJ | 학술논문

目的：评价 CT 扫描剂量对重建颌面部软硬组织三维模型的影响，为低剂量 CT（LDCT）在颜面赝复体 CAD/CAM技术中的应用提供依据。方法：采用 Lightspeed 16排螺旋 CT 机对成人尸头标本，分别进行常规参数（280 mA）和低剂量参数（200、150、100、50、35、25、15、5 mA）扫描，应用 Mimics 10．01软件重建软硬组织三维模型；利用 Geomagic 11．0软件进行三维比较，评价不同扫描参数下重建软硬组织三维模型表面形态的差异。结果：随着管电流的降低，模型表面逐渐变粗糙，与280 mA 相比，降至35 mA 时模型表面仍较光顺，但降至25 mA 以下时表面粗糙，难以确定其准确形态；模型配准后表面形态检测得出相同的结果。结论：低剂量 CT（35 mA）扫描可用于颌面部软硬组织三维模型的重建。
목적：평개 CT 소묘제량대중건합면부연경조직삼유모형적영향，위저제량 CT（LDCT）재안면안복체 CAD/CAM기술중적응용제공의거。방법：채용 Lightspeed 16배라선 CT 궤대성인시두표본，분별진행상규삼수（280 mA）화저제량삼수（200、150、100、50、35、25、15、5 mA）소묘，응용 Mimics 10．01연건중건연경조직삼유모형；이용 Geomagic 11．0연건진행삼유비교，평개불동소묘삼수하중건연경조직삼유모형표면형태적차이。결과：수착관전류적강저，모형표면축점변조조，여280 mA 상비，강지35 mA 시모형표면잉교광순，단강지25 mA 이하시표면조조，난이학정기준학형태；모형배준후표면형태검측득출상동적결과。결론：저제량 CT（35 mA）소묘가용우합면부연경조직삼유모형적중건。
Objective:To evaluate of the feasibility of low-dose CT(LDCT)in the reconstruction of three-dimensional(3D)model of maxillofacial hard and soft tissues.Methods:Lightspeed 16-slice spiral CT scanner was used to scan one adult cadaveric head specimens with conventional parameters(280 mA)and low dose parameters(200,150,100,50,35,25,15 and 5 mA)respectively;the 3D model of the hard and soft tissues were reconstructed with Mimics 10.01 software,and 3D comparison were carried on with Geomagic 11.0 software.A comparison of the surface morphology of the hard and soft tissues of the 3D models with different scanning parameters was made.Results:With the reduction of the tube current,the model surface became rough gradually.Compared with the 280 mA scan results,the model surface produced by 35 mA scanning was still fairing,when the dose fell to less than 25 mA,the model surface became rough and the exact shape of the model could not be recognized.The same results of model surface were pro-duced after registration.Conclusion:The low-dose (35 mA)CT can be used to reconstruct 3D model of the maxillofacial hard and soft tissues.