3D visualization technology is a tool used for displaying, describing, and understanding the characteristics of geologic bodies, and features high efficiency, objective accuracy, visual expression, etc. In this paper,...3D visualization technology is a tool used for displaying, describing, and understanding the characteristics of geologic bodies, and features high efficiency, objective accuracy, visual expression, etc. In this paper, the man-machine interactive interpretation and 3D visualization technology rapidly displaying and analyzing the 3D seismic data of hydrate ore volume is researched and developed using the hybrid rendering technique. Through the integrated interpretation on the 3D space structure, stratum, and seismic attributes, the visualized multi-attribute superimposition analysis is implemented for describing the spatial distribution characteristics of hydrate ore volume and exquisitely describing the subtle geological characteristics of hydrate ore volume. By the hybrid rendering technique, authentication and interpretation are provided for the geological exploration work, so as to greatly enhance the visualization and accuracy of the geological analysis, and also provide a good decision-making foundation for the subsequent development of resources.展开更多
To explore the value of helical CT volume rendering technique (VRT) in post-operative evaluation of screw fixation of axis fractures.Methods There were 21 cases of screw fixation of axis fractures between February 200...To explore the value of helical CT volume rendering technique (VRT) in post-operative evaluation of screw fixation of axis fractures.Methods There were 21 cases of screw fixation of axis fractures between February 2002 and May 2004 in the study including six cases with fractures on axis body,five on odontoid process and 10 on axis body and odontoid process.All cases received X-ray plain film,helical CT scanning,multi-planar reformatting(MPR) and VRT.Results Screw fixation through axis body and massa lateralis atlantis was performed in 10 cases and that through axis body and odontoid process in 11.VRT could clearly display full aperture of screw orbit,location of screw and angle of fixation and hence was superior to X-ray plain film and MPR.Multi-angle VRT displayed asymmetrical space of odontoid process and massa lateralis atlantis in four cases and medial deviation of 2～5 mm of half screw in screw fixation through axis body and massa lateralis atlantis in six.Conclusion VRT can eliminate false shadow of fixation screw,clearly display full aperture of screw orbit and hence supply improtant imaging evidence for post-operative evaluation of screw fixation of axis fractures.7 refs,1 fig,1 tab.展开更多
BACKGROUND The auricle,or auricula,defines the visible boundaries of the external ear and is essential in forensic investigations,including facial reconstruction and human remains identification.Beyond its forensic si...BACKGROUND The auricle,or auricula,defines the visible boundaries of the external ear and is essential in forensic investigations,including facial reconstruction and human remains identification.Beyond its forensic significance,auricular morphology attracts interest from various fields,such as medicine and industry.The size of the ears is culturally associated with health and longevity,while surgical techniques for ear reconstruction address both congenital and aesthetic concerns.AIM To determine whether known correlations with various measurements and observations regarding sex and age could also be established through computed tomography(CT).METHODS Computed tomography scans of the head from 342 females and 329 males aged 18 to 97 years(mean=60±19 years)were included in this study.Different auricular lengths,widths and perimeters were measured for both sides.Additionally,the preauricular area was assessed using three-dimensional volume rendering tech-nique images.RESULTS The measured auricular dimensions in centimeters are presented as mean values(right/left)for males(length 16.91±0.51/6.93±0.52;length 22.83±0.35/2.84±0.34;width 13.94±0.32/4.01±0.36;width 23.51±0.34/3.46±0.31;perimeter 17.66±1.25/17.71±1.28)and females(length 16.44±0.5/6.48±0.51;length 22.7±0.32/2.71±0.33;width 13.6±0.32/3.68±0.31;width 23.3±0.3/3.26±0.27;perimeter 16.36±1.2/16.46±1.2).A positive correlation with age was shown in all measurements,with the highest value for perimeter in both,males(r-value:right/left:0.49/0.47)and females(r-value:right/left:0.53/0.53).After confounding factors were excluded,the preauricular vertical line was first seen at 45 years.The mean age for males with preauricular vertical lines was 66.65±10.92 years(95%CI:63.99-69.3),while without vertical lines,it was 44.48±16.15 years(95%CI:41.21-47.74);for females,it was 70.18±12.44 years(95%CI:68.9-71.46)with and 47.87±17.09 years(95%CI:45.96-49.78)without vertical lines.CONCLUSION In this study,we pioneered the use of CT volumetric data to examine human auricle morphology and we achieved a precise 3D(pre-)auricular assessment.Sex-specific positive correlations between ear dimensions and age,as well as the mean age for the appearance of preauricular lines,were identified,providing valuable insights into the capabilities of modern CT devices.展开更多
Objective To assess the diagnostic value of the airway post-processing technique of multi-slice spiral CT(MSCT)in accessory cardiac bronchus(ACB)and to improve the understanding of this disease.Methods The original MS...Objective To assess the diagnostic value of the airway post-processing technique of multi-slice spiral CT(MSCT)in accessory cardiac bronchus(ACB)and to improve the understanding of this disease.Methods The original MSCT axial images and various post-processing reconstructed images of 9 ACB cases were retrospectively analyzed.Airway post-processing techniques,including multi-planar reformation(MPR),minimum intensity projection(MinIP),volume rendering technique(VRT),CT virtual endoscopy(CTVE)and tissue transition projection(TTP),were employed.Three-dimensional recombination images of bronchial trees were obtained and classified according to the Mangiulea classification.Results Among the 9 cases with ACB,there were 6 cases of accessory-lobed type,3 cases of long diverticular type,and no cases of short diverticular type.The lateral axial images,MPR,MinIP,VRT,CTVE,and TTP all clearly displayed ACB.Among the 6 cases of accessorylobed type,there were 5 cases with accessory lobe dysplasia and one case with pneumonia in an accessory lobe.One case was complicated with accessory lobe emphysema.Among the 3 cases with long diverticular type ACB,one had pneumonia.Among the 9 cases,there was 1 case with old tuberculous focus,1 case with pulmonary fibrous focus,1 case with pleural thickening and adhesion,and 1 case with tracheal diverticulum.Conclusion The airway post-processing technique of MSCT can not only clarify the diagnosis,origin and classification of ACB,but also measure the opening diameter,length and distance to the tracheal carina of ACB.It guides clinical treatment and tracheoscopy,etc,and can be used as the preferred examination method for ACB.展开更多
Background:Radiological imaging plays a pivotal role in forensic anthropology.As have the imaging techniques advances,so have the digital skeletal measurements inched towards precision.Secular trends of the population...Background:Radiological imaging plays a pivotal role in forensic anthropology.As have the imaging techniques advances,so have the digital skeletal measurements inched towards precision.Secular trends of the population keep on changing in modem times.Hence,finding the precise technique of bone measurement,with greater reproducibility,in modem population is always needed in making population specific biological profile.Aim and Objective:The aim of this study was to estimate the accuracy of the foramen magnum measurement,obtained by three dimensional multi-detector computed tomography using volume rendering technique with the cut off value of each variable,in sex determination of an individual.Materials and Methods:Two metric traits,an antero-posterior diameter(APD)and transverse diameter(TD),were measured digitally in an analysis of 130 radiological images having equal proportion of male and female samples.Foramen magnum index and area of foramen magnum(Area by Radinsky's[AR],Area by Teixeira5s[AT])were derived from APD and TD.Results:Descriptive statistical analysis,using unpaired t-test,showed significant higher value in males in all the variables.Using Pearson correlation analysis,maximum correlation was observed between area(AT and AR r=0.999)and between area and TD(AR r=0.955 and AT r=0.945 respectively).When used individually,TD had the highest predictive value(67.7%)for sex detennination among all the parameters followed by AT(65.4%)and AR(64.6%).Cutoff value of variables TD,AR and AT were 29.9 mm,841.80 mm2 and 849.70 mm2 respectively.Receiver operating characteristic curve predicted male and female sex with 96.2%and 89.2%accuracy respectively.The overall accuracy of the model was 92.7%.Conclusion:Measurements from 3D CT using volume rendering technique were precise,and the application of logistic regression analysis predicted the sex with more accuracy.展开更多
文摘3D visualization technology is a tool used for displaying, describing, and understanding the characteristics of geologic bodies, and features high efficiency, objective accuracy, visual expression, etc. In this paper, the man-machine interactive interpretation and 3D visualization technology rapidly displaying and analyzing the 3D seismic data of hydrate ore volume is researched and developed using the hybrid rendering technique. Through the integrated interpretation on the 3D space structure, stratum, and seismic attributes, the visualized multi-attribute superimposition analysis is implemented for describing the spatial distribution characteristics of hydrate ore volume and exquisitely describing the subtle geological characteristics of hydrate ore volume. By the hybrid rendering technique, authentication and interpretation are provided for the geological exploration work, so as to greatly enhance the visualization and accuracy of the geological analysis, and also provide a good decision-making foundation for the subsequent development of resources.
文摘To explore the value of helical CT volume rendering technique (VRT) in post-operative evaluation of screw fixation of axis fractures.Methods There were 21 cases of screw fixation of axis fractures between February 2002 and May 2004 in the study including six cases with fractures on axis body,five on odontoid process and 10 on axis body and odontoid process.All cases received X-ray plain film,helical CT scanning,multi-planar reformatting(MPR) and VRT.Results Screw fixation through axis body and massa lateralis atlantis was performed in 10 cases and that through axis body and odontoid process in 11.VRT could clearly display full aperture of screw orbit,location of screw and angle of fixation and hence was superior to X-ray plain film and MPR.Multi-angle VRT displayed asymmetrical space of odontoid process and massa lateralis atlantis in four cases and medial deviation of 2～5 mm of half screw in screw fixation through axis body and massa lateralis atlantis in six.Conclusion VRT can eliminate false shadow of fixation screw,clearly display full aperture of screw orbit and hence supply improtant imaging evidence for post-operative evaluation of screw fixation of axis fractures.7 refs,1 fig,1 tab.
基金Supported by Schulz B received funding from Guerbet AG,No.8050.
文摘BACKGROUND The auricle,or auricula,defines the visible boundaries of the external ear and is essential in forensic investigations,including facial reconstruction and human remains identification.Beyond its forensic significance,auricular morphology attracts interest from various fields,such as medicine and industry.The size of the ears is culturally associated with health and longevity,while surgical techniques for ear reconstruction address both congenital and aesthetic concerns.AIM To determine whether known correlations with various measurements and observations regarding sex and age could also be established through computed tomography(CT).METHODS Computed tomography scans of the head from 342 females and 329 males aged 18 to 97 years(mean=60±19 years)were included in this study.Different auricular lengths,widths and perimeters were measured for both sides.Additionally,the preauricular area was assessed using three-dimensional volume rendering tech-nique images.RESULTS The measured auricular dimensions in centimeters are presented as mean values(right/left)for males(length 16.91±0.51/6.93±0.52;length 22.83±0.35/2.84±0.34;width 13.94±0.32/4.01±0.36;width 23.51±0.34/3.46±0.31;perimeter 17.66±1.25/17.71±1.28)and females(length 16.44±0.5/6.48±0.51;length 22.7±0.32/2.71±0.33;width 13.6±0.32/3.68±0.31;width 23.3±0.3/3.26±0.27;perimeter 16.36±1.2/16.46±1.2).A positive correlation with age was shown in all measurements,with the highest value for perimeter in both,males(r-value:right/left:0.49/0.47)and females(r-value:right/left:0.53/0.53).After confounding factors were excluded,the preauricular vertical line was first seen at 45 years.The mean age for males with preauricular vertical lines was 66.65±10.92 years(95%CI:63.99-69.3),while without vertical lines,it was 44.48±16.15 years(95%CI:41.21-47.74);for females,it was 70.18±12.44 years(95%CI:68.9-71.46)with and 47.87±17.09 years(95%CI:45.96-49.78)without vertical lines.CONCLUSION In this study,we pioneered the use of CT volumetric data to examine human auricle morphology and we achieved a precise 3D(pre-)auricular assessment.Sex-specific positive correlations between ear dimensions and age,as well as the mean age for the appearance of preauricular lines,were identified,providing valuable insights into the capabilities of modern CT devices.
文摘Objective To assess the diagnostic value of the airway post-processing technique of multi-slice spiral CT(MSCT)in accessory cardiac bronchus(ACB)and to improve the understanding of this disease.Methods The original MSCT axial images and various post-processing reconstructed images of 9 ACB cases were retrospectively analyzed.Airway post-processing techniques,including multi-planar reformation(MPR),minimum intensity projection(MinIP),volume rendering technique(VRT),CT virtual endoscopy(CTVE)and tissue transition projection(TTP),were employed.Three-dimensional recombination images of bronchial trees were obtained and classified according to the Mangiulea classification.Results Among the 9 cases with ACB,there were 6 cases of accessory-lobed type,3 cases of long diverticular type,and no cases of short diverticular type.The lateral axial images,MPR,MinIP,VRT,CTVE,and TTP all clearly displayed ACB.Among the 6 cases of accessorylobed type,there were 5 cases with accessory lobe dysplasia and one case with pneumonia in an accessory lobe.One case was complicated with accessory lobe emphysema.Among the 3 cases with long diverticular type ACB,one had pneumonia.Among the 9 cases,there was 1 case with old tuberculous focus,1 case with pulmonary fibrous focus,1 case with pleural thickening and adhesion,and 1 case with tracheal diverticulum.Conclusion The airway post-processing technique of MSCT can not only clarify the diagnosis,origin and classification of ACB,but also measure the opening diameter,length and distance to the tracheal carina of ACB.It guides clinical treatment and tracheoscopy,etc,and can be used as the preferred examination method for ACB.
文摘Background:Radiological imaging plays a pivotal role in forensic anthropology.As have the imaging techniques advances,so have the digital skeletal measurements inched towards precision.Secular trends of the population keep on changing in modem times.Hence,finding the precise technique of bone measurement,with greater reproducibility,in modem population is always needed in making population specific biological profile.Aim and Objective:The aim of this study was to estimate the accuracy of the foramen magnum measurement,obtained by three dimensional multi-detector computed tomography using volume rendering technique with the cut off value of each variable,in sex determination of an individual.Materials and Methods:Two metric traits,an antero-posterior diameter(APD)and transverse diameter(TD),were measured digitally in an analysis of 130 radiological images having equal proportion of male and female samples.Foramen magnum index and area of foramen magnum(Area by Radinsky's[AR],Area by Teixeira5s[AT])were derived from APD and TD.Results:Descriptive statistical analysis,using unpaired t-test,showed significant higher value in males in all the variables.Using Pearson correlation analysis,maximum correlation was observed between area(AT and AR r=0.999)and between area and TD(AR r=0.955 and AT r=0.945 respectively).When used individually,TD had the highest predictive value(67.7%)for sex detennination among all the parameters followed by AT(65.4%)and AR(64.6%).Cutoff value of variables TD,AR and AT were 29.9 mm,841.80 mm2 and 849.70 mm2 respectively.Receiver operating characteristic curve predicted male and female sex with 96.2%and 89.2%accuracy respectively.The overall accuracy of the model was 92.7%.Conclusion:Measurements from 3D CT using volume rendering technique were precise,and the application of logistic regression analysis predicted the sex with more accuracy.
