|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Bone mineral density in cone beam computed tomography:Only a few shades of gray显示文摘Cone beam computed tomography(CBCT) has often been used to determine the quality of craniofacial bone structures through the determination of mineral density, which is based on gray scales of the images obtained. However, there is no consensus regarding the accuracy of the determination of the gray scales in these exams. This study aims to provide a literature review concerning the reliability of CBCT to determine bone mineral density. The gray values obtained with CBCT show a linear relationship with the attenuation coefficients of the materials, Hounsfield Units values obtained with medical computed tomography, and density values from dual energy X-ray absorciometry. However, errors are expected when CBCT images are used to define the quality of the scanned structures be-cause these images show inconsistencies and arbitrari-ness in the gray values, particularly when related to abrupt change in the density of the object, X-ray beam hardening effect, scattered radiation, projection data discontinuity-related effect, differences between CBCTdevices, changes in the volume of the field of view(FOV), and changes in the relationships of size and position between the FOV and the object evaluated. A few methods of mathematical correction of the gray scales in CBCT have been proposed; however, they do not generate consistent values that are independent of the devices and their configurations or of the scanned objects. Thus, CBCT should not be considered the ex-amination of choice for the determination of bone and soft tissue mineral density at the current stage, par-ticularly when values obtained are to be compared to predetermined standard values. Comparisons between symmetrically positioned structures inside the FOV and in relation to the exomass of the object, as it occurs with the right and left sides of the skull, seem to be viable because the effects on the gray scale in the re-gions of interest are the same. | Marcio José da Silva Campos Thainara Salgueiro de Souza Sergio Luiz Mota Júnior Marcelo Reis Fraga Robert Willer Farinazzo Vitral | 2014 | World Journal of Radiology2014，6，8： | 3 |
| 2 | Computed tomography evalu-ation of the temporomandibular joint in Class I malocclusion pa-tients:Condylar symmetry and condyle-fossa Relationship显示文摘 | Rodrigues AF Fraga MR Vitral RW | 2009 | Am J Orthod Dentofacial Orthop2009，136，2： | 1 |
| 3 | Computed tomography evaluation of tem-poromandibular joint alterations in classⅡDivision 1 subdivisionpatients:condylar symmetry显示文摘 | Vitral RW Telles Cde S | 2002 | Am J Orthod Dentofacial Or-thop2002，121，4： | 1 |
| 4 | Temporomandibuiar joint and normal occlusion: is there anything singular about it? a computed tomographic evaluation 显示文摘 | Vitral RW da Silva Campos M J Rodrigues AF | 2011 | Am J Orthod Dentofacila Orthop2011，140，1： | 1 |
| 5 | Serological evidence of hepatitis E virus infection in different animal species from the Southeast of Brazil显示文摘 | Vitral C L Pinto M A Lewis-Ximenez L L Khudyakov Y E dos Santos D R Gaspar A M | 2005 | Mere Inst Oswaldo Cruz2005，100，2： | 1 |
| 6 | Serological evidence of hepatitis E virus infection in different animal species from the Southeast of Brazil显示文摘 | Vitral CL Pinto MA Lia LL | 2005 | Mem Inst Oswaldo Cruz Rio de Janeiro2005，100，2： | 1 |
| 7 | Computed tomography evaluation of the temporo mandibular joint in Class ]] division 1 and Class II malocclusion patients:Condylar symmetry and condyle-fossa relationship 显示文摘 | Rodrigues AF Fraga MR Vitral RW | 2009 | Am J Orthod Dentofacial Orthop2009，136，2： | 1 |
| 8 | Computed tomography evaluation of temp-oromandibular joint alterations in patients with class IIdivision 1 subdivision malocclusions: condyle-fossarelationship 显示文摘 | VITRAL R W | 2004 | Am J Orthod Dentofac-ial Orthop2004，126，1： | 1 |
| 9 | Computed tomography evaluation of temporomandibular joint alterations in patients with Class lI division 1 subdivision malocclusions: condyle-fossa relationship 显示文摘 | Vitral RW Telles Cde S Fraga MR | 2004 | Am J Orthod Dentofacial Orthop2004，126，1： | 1 |
| 10 | An online dynamic security assessment scheme using phasor measurements and decision trees 显示文摘 | SUN K LIKHATE S VITrAL V | 2007 | IEEE Trans on Power Systems2007，22，4： | 1 |
| 11 | Temporomandibular joint alterations after correction of a unilateral posterior crossbite in a mixed-dentition patient: a computed tomography study 显示文摘 | Vitral RW Fraga MR de-Oliveira RS | 2007 | ''Am J Orthod Dentofaeial Orthop2007，132，3： | 1 |
| 12 | Computed tomography evaluation of temporomamdibular joint alterations in patients with class Ⅱ division 1 subdivision malocclusions: condyle-fossa relationship 显示文摘 | Vitral RW Telles Cde S Fraga MR | 2004 | Am J Orthod Dentofacial Orthop2004，126，1： | 1 |
| 13 | Assessment of painexperience in adults and children after bracket bonding and initial archwireinsertion 显示文摘 | Baceetti MJ Fraga MR Vitral RW | 2013 | Dental Press J Orthod2013，18，5： | 1 |
| 14 | Computed tomography evaluation of temporomandibular joint aheratons in class Ⅱ Division 1 subdivision patients: condylar symmetry 显示文摘 | Vitral PW Telles Cde S | 2002 | Am J Orthod Dentofacial Orthop2002，121，4： | 1 |
| 15 | Serological evidence of hepatitis E virus infection in different animal species from the Southeast of Brazil 显示文摘 | VITRAL C L PINTO M A LEWIS-XIMENEZ L L | 2005 | Mem Inst Oswaldo Cruz2005，100，： | 1 |
| 16 | Orthodontic distalization with rigid plate fixation for anchorage after bone grafting and maxillary sinus lifting显示文摘 | Vitral RW da Silva Campos MJ de Andrade Vitral JC | 2009 | Am J Orthod Dentofacial Orthop2009，136，1： | 1 |
| 17 | A steady-state voltage sta- bility analysis of power systems with high penetrations of wind 显示文摘 | VITrAL E OMALLEY M KEANE A | 2010 | IEEE Transactions on Power Systems2010，25，1： | 1 |
| 18 | Computed tomography evaluation of the temporomandibular joint in Class Ⅱ Division 1 and Class Ⅲ malocclusion patients:Condylar symmetry and condyle-fossa relationship显示文摘 | Rodrigues AF Fraga MR Vitral RW | 2009 | Am J Orthod Dentofacial Orthop2009，136，2： | 1 |
| 19 | Computed tomography evaluation of the temporomandibular joint in Class I malocclusion patients: condylar symmetry and condyle-fossa relationship 显示文摘 | Rodrigues AF Fraga MR Vitral RW | 2009 | Am J Orthod Dentofacial Orthop2009，136，2： | 1 |
| 20 | Correlation between miniscrew stability and bone mineral density in orthodontic patients 显示文摘 | San tiago RC de Paula FO Fraga MR PicorelliAssis NM Vitral RW | 2009 | Am J Orthod Dentofacial Orthop2009，36，： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员