Cone beam computed tomography로 합성된 두부규격 방사선사진에서의 각 계측점의 정확도와 재현성에 관한 연구
Accuracy and reproducibility of landmark of cone beam computed tomography (CT) synthesized cephalograms
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Introduction: Cone beam computed tomography (CBCT) has various advantages and is used favorably in many fields in dentistry. Especially,CBCT is being used as basic diagnostic tool for 3-dimensional analysis in orthognathic patient. Two-dimensional cephalograms can be synthesized from CBCT digital imaging and communications in medicine (DICOM) data. In this study, conventional cephalograms and CBCT were taken simultaneously,and representative landmarks were located and analyzed in its accuracy and reproducibility. Materials and Methods: Ten patients who had orthognathic surgery in Wonkwang University Daejeon Dental Hospital participated in this study. For each patient, CBCT and conventional cephalogram was taken. By using Ondemand (Cybermad, Korea), 2-dimensional cephalograms was established on CBCT. In addition, 19 landmarks were designated and measured by 3 orthodontists twice a week. After these landmarks were transferred to a coordinate, distance of landmark and axis, standard error, distribution degree were measured, compared and analyzed. Results: Comparing the CT ceph group and conventional cephalogram group, CT ceph group had shown shorter distance of landmark and axis in S,Hinge axis, Bpt, Ba, Or, Corpus left. Standard error of the mean shows that CT ceph group has better reproducibility in Or, Corpus left, Hinge axis at X axis and Na, U1R, U1T, Bpt, PNS, Ba Corpus left, Hinge axis at Y axis. In both groups, mean error was less than 1.00 mm, no significant difference were found between CT ceph group and conventional cephalogram group in all measurements. Furthermore, comparing two groups, each 17landmarks out of 19 had its characteristic in distribution degree. Conclusion: No significant difference were found between CBCT composed cephalographic radiograph and conventional cephalograghic radiograph,clinical application may be possible if improved.
Abstract
Introduction: Cone beam computed tomography (CBCT) has various advantages and is used favorably in many fields in dentistry. Especially,CBCT is being used as basic diagnostic tool for 3-dimensional analysis in orthognathic patient. Two-dimensional cephalograms can be synthesized from CBCT digital imaging and communications in medicine (DICOM) data. In this study, conventional cephalograms and CBCT were taken simultaneously,and representative landmarks were located and analyzed in its accuracy and reproducibility. Materials and Methods: Ten patients who had orthognathic surgery in Wonkwang University Daejeon Dental Hospital participated in this study. For each patient, CBCT and conventional cephalogram was taken. By using Ondemand (Cybermad, Korea), 2-dimensional cephalograms was established on CBCT. In addition, 19 landmarks were designated and measured by 3 orthodontists twice a week. After these landmarks were transferred to a coordinate, distance of landmark and axis, standard error, distribution degree were measured, compared and analyzed. Results: Comparing the CT ceph group and conventional cephalogram group, CT ceph group had shown shorter distance of landmark and axis in S,Hinge axis, Bpt, Ba, Or, Corpus left. Standard error of the mean shows that CT ceph group has better reproducibility in Or, Corpus left, Hinge axis at X axis and Na, U1R, U1T, Bpt, PNS, Ba Corpus left, Hinge axis at Y axis. In both groups, mean error was less than 1.00 mm, no significant difference were found between CT ceph group and conventional cephalogram group in all measurements. Furthermore, comparing two groups, each 17landmarks out of 19 had its characteristic in distribution degree. Conclusion: No significant difference were found between CBCT composed cephalographic radiograph and conventional cephalograghic radiograph,clinical application may be possible if improved.
참고문헌 (21)
- Broadbent BH, "A new x-ray technique and its application to orthodontia", Angle orthod, 1, pp.45~66 (1931)
- Mah JK, "Radiation absorbed in maxillofacial imaging with a new dental computed tomography device", Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 96, pp.508~513 (2003)
- Tsiklakis K, "Dose reduction in maxillofacial imaging using low dose Cone Beam CT", Eur J Radiol, 56, pp.413~417 (2005)
- Halazonetis DJ, "From 2-dimensional cephalograms to 3-dimensional computed tomography scans", Am J Orthod Dentofacial Orthop, 127, pp.627~637 (2005)
- Huang J, "Three-dimensional radiographic analysis in orthodontics", J Clin Orthod, 39, pp.421~428 (2005)
- 강지영, "Cone-beam CT로부터 제작된 측모 두부계측방사선사진의 정확도 평가", 대한치과교정학회지, 37(6), pp.391~399 (2007), 대한치과교정학회
- Adams GL, "Comparison between traditional 2-dimensional cephalometry and a 3-dimensional approach on human dry skulls", Am J Orthod Dentofacial Orthop, 126, pp.397~409 (2004)
- Kamiishi H, "Development of the 3Dcephalogram: a technical note", J Craniomaxillofac Surg, 35, pp.258~260 (2007)
- Mori Y, "An accurate threedimensional cephalometric system: a solution for the correction of cephalic malpositioning", J Orthod, 28, pp.143~149 (2001)
- Grayson B, "The three-dimensional cephalogram: theory, technique, and clinical application", Am J Orthod Dentofacial Orthop, 94, pp.327~337 (1988)
- Baumrind S, "Three-dimensional x-ray stereometry from paired coplanar images: a progress report", Am J Orthod, 84, pp.292~312 (1983)
- Brown T, "Computer-assisted location of reference points in three dimensions for radiographic cephalometry", Am J Orthod Dentofacial Orthop, 95, pp.490~498 (1989)
- Trocme′MC, "A biplanar cephalometric stereoradiography technique", Am J Orthod Dentofacial Orthop, 98, pp.168~175 (1990)
- Bae GS, "The comparative study of three-dimensional cephalograms in linear and angular measurements", Korea J Orthod, 27, pp.129~140 (1997)
- Gravely JF, "The clinical significance of tracing error in cephalometry", Br J Orthod, 1, pp.95~101 (1974)
- McClure SR, "Reliability of digital versus conventional cephalometric radiology: a comparative evaluation of landmark identification error", Semin Orthod, 11, pp.98~110 (2005)
- Trpkova B, "Cephalometric landmarks identification and reproducibility: a meta analysis", Am J Orthod Dentofacial Orthop, 112, pp.165~170 (1997)
- Geelen W, "Reproducibility of cephalometric landmarks on conventional film, hardcopy, and monitor-displayed images obtained by the storage phosphor technique", Eur J Orthod, 20, pp.331~340 (1998)
- Farman AG, "Development of imaging selection criteria and procedures should precede cephalometric assessment with cone-beam computed tomography", Am J Orthod Dentofacial Orthop, 130, pp.257~265 (2006)
- Moshiri M, "Accuracy of linear measurements from imaging plate and lateral cephalometric images derived from cone-beam computed tomography", Am J Orthod Dentofacial Orthop, 132, pp.550~560 (2007)
- Liu JK, "Accuracy of computerized automatic identification of cephalometric landmarks", Am J Orthod Dentofacial Orthop, 118, pp.535~540 (2000)