This paper introduces the characteristics of Computed Tomography （CT） technology and reviews its history, current situation, representative achievements, and use of using CT technology on frozen soil study, includin...This paper introduces the characteristics of Computed Tomography （CT） technology and reviews its history, current situation, representative achievements, and use of using CT technology on frozen soil study, including auxiliary equipment specially de- signed for frozen soil studies. CT numbers are used to analyze frozen soil internal structure change, defining and exploring dam- age evolution, and use of CT images on observing soil mesostructure. Finally, this paper presents existing problems confronted by using CT in frozen soil studies, possible solutions and challenges, among which, we introduce high quality CT image processing for frozen soils, and relations between CT number change and each component change on frozen soil samples within the region of interest. It is shown that present CT technology is one of the most ideal and effective technology to study frozen soil mesostructure using non-desmactive testing. CT technology will play a key role in the study and development in the field of frozen soil by means of auxiliary equipment and the digital imaging processing.展开更多
With the rapid development of submarine oil and gas,the security issues of submarine oil and gas pipeline become increasingly prominent,and regular inspection of submarine pipeline is particularly important.Therefore,...With the rapid development of submarine oil and gas,the security issues of submarine oil and gas pipeline become increasingly prominent,and regular inspection of submarine pipeline is particularly important.Therefore,a submarine pipeline inspection robot system based on CT technology to solve the problems such as low traditional manual inspection efficiency,high labor cost,low security and backward inspection methods.Based on the platform of ROV robot,carrying CT scanner as an external detection device,the system is used for non-invasive inspection of submarine pipeline,which is safe and harmless,with good economy,high mobility,and strong environmental adaptability.Compared with traditional technology,CT scanner’s external inspection technology used in the system avoids the damage to the external protective layer of the pipeline in the measurement of pipeline wall thickness.Meantime,it can provide the tomography of the pipe wall and the composition of the sediment material on the inside wall,which fills the gap in this technical field in China.According to the test,the robot has the characteristics of stable adsorption,flexible movement,and clear pipeline CT scanning image,and can realize the intelligent inspection of submarine pipeline.展开更多
Objective: to explore the accuracy and sensitivity of bone malformation in C T diagnosis group. Methods: from March 2019 to June 2020, 72 patients suspected of osteonecrosis were selected and treated in our hospital. ...Objective: to explore the accuracy and sensitivity of bone malformation in C T diagnosis group. Methods: from March 2019 to June 2020, 72 patients suspected of osteonecrosis were selected and treated in our hospital. All patients underwent C-T examination, X-ray examination and magnetic resonance diagnosis. Statistical analysis was made on the bone state of femoral head defect diagnosed by C-T scan, X-ray and magnetic resonance, as well as the accuracy of C-T scan, X-ray and magnetic resonance diagnosis, and the sensitivity and specificity of femoral defect. Results: according to the final clinical diagnosis, out of 72 patients suspected of osteonecrosis, a total of 1 patient was diagnosed as osteoporosis. A total of 65 patients with femoral diseases, the positive rate of femoral necrosis was higher than that of CT scan and X-ray, while the positive rate of femoral necrosis was higher than that of X-ray, with statistical significance (P < 0.05). The accuracy, sensitivity and specificity of magnetic resonance diagnosis of femoral defect were higher than those of t-scan and x-ray scan, and the accuracy and sensitivity of CT scan were higher than those of x-ray, the difference was statistically significant (P < 0.05). Compared with X-ray films (P > 0.05), the features found by computed tomography of femoral necrosis have no statistical significance Conclusion: magnetic resonance diagnosis has higher value in clinical diagnosis of patients with femoral head necrosis than CT scan and X-ray films.展开更多
Objective To discuss the measurement of bone tumor volume on the basis of three dimensional images segmentation technology. Methods Twenty patients with lacunar bone tumor from Tianjin Hospital and Tongji Hospital wer...Objective To discuss the measurement of bone tumor volume on the basis of three dimensional images segmentation technology. Methods Twenty patients with lacunar bone tumor from Tianjin Hospital and Tongji Hospital were included in the展开更多
With the application of X-ray computed tomography（CT） technology of C80 high-strength concrete with polypropylene fiber at elevated temperatures, the microscopic damage evolution process observation and image buildi...With the application of X-ray computed tomography（CT） technology of C80 high-strength concrete with polypropylene fiber at elevated temperatures, the microscopic damage evolution process observation and image building could be obtained, based on the statistics theory and numerical analysis of the combination of concrete internal defects extension and evolution regularity of microscopic structure. The expermental results show that the defect rate has changed at different temperatures and can determine the concrete degradation threshold temperatures. Also, data analysis can help to establish the evolution equation between the defect rate and the effect of temperature damage, and identify that the addition of polypropylene fibers in the high strength concrete at high temperature can improve cracking resistance.展开更多
Objective: to analyze the application value of SPECT/CT fusion imaging technology in differential diagnosis of benign and malignant spinal lesions. Methods: all the subjects were diagnosed with SPECT/CT fusion imaging...Objective: to analyze the application value of SPECT/CT fusion imaging technology in differential diagnosis of benign and malignant spinal lesions. Methods: all the subjects were diagnosed with SPECT/CT fusion imaging technology, and then all the subjects were diagnosed with CT-guided percutaneous spinal biopsy. 42 cases of benign lesions were confirmed and 18 cases of malignant lesions, accounting for 70.00% and 30.00% respectively. Taking CT-guided biopsy as the gold standard, the detection rates of benign and malignant spinal lesions by SPECT/CT fusion imaging were statistically compared. Results: there was no significant difference between differential diagnosis accuracy and gold standard in SPECT/CT fusion imaging technique (P > 0.05). Conclusion: it has high differential diagnosis accuracy, can effectively identify patients' diseases, and is worthy of clinical application.展开更多
Due to the low permeability of tight reservoirs,throats play a significant role in controlling fluid flow.Although many studies have been conducted to investigate fluid flow in throats in the microscale domain,compara...Due to the low permeability of tight reservoirs,throats play a significant role in controlling fluid flow.Although many studies have been conducted to investigate fluid flow in throats in the microscale domain,comparatively fewer works have been devoted to study the effect of adsorption boundary layer(ABL)in throats based on the digital rock method.By considering an ABL,we investigate its effects on fluid flow.We build digital rock model based on computed tomography technology.Then,microscopic pore structures are extracted with watershed segmentation and pore geometries are meshed through Delaunay triangulation approach.Finally,using the meshed digital simulation model and finite element method,we investigate the effects of viscosity and thickness of ABL on microscale flow.Our results demonstrate that viscosity and thickness of ABL are major factors that significantly hinder fluid flow in throats.展开更多
Rectal cancer(RC)is one of the most common cancers worldwide.RC has high morbidity and mortality rates,with locally advanced rectal cancer(LARC)accounting for>30%of cases.Patients with LARC are routinely treated wi...Rectal cancer(RC)is one of the most common cancers worldwide.RC has high morbidity and mortality rates,with locally advanced rectal cancer(LARC)accounting for>30%of cases.Patients with LARC are routinely treated with neoadjuvant chemoradiotherapy(nCRT)but treatment outcomes vary greatly.It is crucial to predict and evaluate patient response to nCRT as early as possible.Radiomics is a potentially useful and non-invasive tool for clinical applications in different types of cancer including colorectal cancer.Radiomics has recently been used to predict treatment outcomes and many published studies have demonstrated the efficacy of radiomics.This review will discuss the application of radiomics in predicting of LARC response to nCRT and provide new insight for corollary studies.展开更多
There is major interest within the bio-engineering community in developing accurate and non-invasive means for visualizing, modeling and analyzing bone micro-structures. Bones are composed of hierarchical bio-composit...There is major interest within the bio-engineering community in developing accurate and non-invasive means for visualizing, modeling and analyzing bone micro-structures. Bones are composed of hierarchical bio-composite materials characterized by complex multi-scale structural geometry. The process of reconstructing a volumetric bone model is usually based upon CT/MRI scanned images. Meshes generated by current commercial CAD systems cannot be used for further modeling or analysis. Moreover, recently developed methods are only capable of capturing the micro-structure for small volumes （biopsy samples）. This paper examines the problem of re-meshing a 3D computerized model of bone micro- structure. The proposed method is based on the following phases： defining sub-meshes of the original model in a grid-based structure, remeshing each sub-mesh using the neural network （NN） method, and merging the sub-meshes into a global mesh. Applying the NN method to micro-structures proved to be quite time consuming. Therefore, a parallel, grid-based approach was applied, yielding a simpler structure in each grid cell. The performance of this method is analyzed, and the method is demonstrated on real bone micro-structures. Furthermore, the method may be used as the basis for generating a multi-resolution bone geometric model.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.4102300340971046+3 种基金41201181)the Foundation of State Key Laboratory of Frozen Soil Engineering(No.Y252J81001)the Youth Foundation of Cold and Arid Regions Environmental Engineering Research InstituteChinese Academy of Sciences(No.51Y251B91)
文摘This paper introduces the characteristics of Computed Tomography （CT） technology and reviews its history, current situation, representative achievements, and use of using CT technology on frozen soil study, including auxiliary equipment specially de- signed for frozen soil studies. CT numbers are used to analyze frozen soil internal structure change, defining and exploring dam- age evolution, and use of CT images on observing soil mesostructure. Finally, this paper presents existing problems confronted by using CT in frozen soil studies, possible solutions and challenges, among which, we introduce high quality CT image processing for frozen soils, and relations between CT number change and each component change on frozen soil samples within the region of interest. It is shown that present CT technology is one of the most ideal and effective technology to study frozen soil mesostructure using non-desmactive testing. CT technology will play a key role in the study and development in the field of frozen soil by means of auxiliary equipment and the digital imaging processing.
文摘With the rapid development of submarine oil and gas,the security issues of submarine oil and gas pipeline become increasingly prominent,and regular inspection of submarine pipeline is particularly important.Therefore,a submarine pipeline inspection robot system based on CT technology to solve the problems such as low traditional manual inspection efficiency,high labor cost,low security and backward inspection methods.Based on the platform of ROV robot,carrying CT scanner as an external detection device,the system is used for non-invasive inspection of submarine pipeline,which is safe and harmless,with good economy,high mobility,and strong environmental adaptability.Compared with traditional technology,CT scanner’s external inspection technology used in the system avoids the damage to the external protective layer of the pipeline in the measurement of pipeline wall thickness.Meantime,it can provide the tomography of the pipe wall and the composition of the sediment material on the inside wall,which fills the gap in this technical field in China.According to the test,the robot has the characteristics of stable adsorption,flexible movement,and clear pipeline CT scanning image,and can realize the intelligent inspection of submarine pipeline.
文摘Objective: to explore the accuracy and sensitivity of bone malformation in C T diagnosis group. Methods: from March 2019 to June 2020, 72 patients suspected of osteonecrosis were selected and treated in our hospital. All patients underwent C-T examination, X-ray examination and magnetic resonance diagnosis. Statistical analysis was made on the bone state of femoral head defect diagnosed by C-T scan, X-ray and magnetic resonance, as well as the accuracy of C-T scan, X-ray and magnetic resonance diagnosis, and the sensitivity and specificity of femoral defect. Results: according to the final clinical diagnosis, out of 72 patients suspected of osteonecrosis, a total of 1 patient was diagnosed as osteoporosis. A total of 65 patients with femoral diseases, the positive rate of femoral necrosis was higher than that of CT scan and X-ray, while the positive rate of femoral necrosis was higher than that of X-ray, with statistical significance (P < 0.05). The accuracy, sensitivity and specificity of magnetic resonance diagnosis of femoral defect were higher than those of t-scan and x-ray scan, and the accuracy and sensitivity of CT scan were higher than those of x-ray, the difference was statistically significant (P < 0.05). Compared with X-ray films (P > 0.05), the features found by computed tomography of femoral necrosis have no statistical significance Conclusion: magnetic resonance diagnosis has higher value in clinical diagnosis of patients with femoral head necrosis than CT scan and X-ray films.
文摘Objective To discuss the measurement of bone tumor volume on the basis of three dimensional images segmentation technology. Methods Twenty patients with lacunar bone tumor from Tianjin Hospital and Tongji Hospital were included in the
基金Funded by the National Natural Science Foundation of China(No.51278325)the Shanxi Province Natural Science Foundation(No.2011011024-2)
文摘With the application of X-ray computed tomography（CT） technology of C80 high-strength concrete with polypropylene fiber at elevated temperatures, the microscopic damage evolution process observation and image building could be obtained, based on the statistics theory and numerical analysis of the combination of concrete internal defects extension and evolution regularity of microscopic structure. The expermental results show that the defect rate has changed at different temperatures and can determine the concrete degradation threshold temperatures. Also, data analysis can help to establish the evolution equation between the defect rate and the effect of temperature damage, and identify that the addition of polypropylene fibers in the high strength concrete at high temperature can improve cracking resistance.
文摘Objective: to analyze the application value of SPECT/CT fusion imaging technology in differential diagnosis of benign and malignant spinal lesions. Methods: all the subjects were diagnosed with SPECT/CT fusion imaging technology, and then all the subjects were diagnosed with CT-guided percutaneous spinal biopsy. 42 cases of benign lesions were confirmed and 18 cases of malignant lesions, accounting for 70.00% and 30.00% respectively. Taking CT-guided biopsy as the gold standard, the detection rates of benign and malignant spinal lesions by SPECT/CT fusion imaging were statistically compared. Results: there was no significant difference between differential diagnosis accuracy and gold standard in SPECT/CT fusion imaging technique (P > 0.05). Conclusion: it has high differential diagnosis accuracy, can effectively identify patients' diseases, and is worthy of clinical application.
基金National Natural Science Foundation of China(No.51674280,51774308,51704033,51722406,51950410591)Shandong Provincial Natural Science Foundation(ZR2019JQ21,JQ201808)+3 种基金the Fundamental Research Funds for the Central Universities(No.20CX02113A)National Science and Technology Major Project(2016ZX05014-000407)Program for Changjiang Scholars and Innovative Research Team in University(IRT_16R69)PetroChina Innovation Foundation(No.2018D-5007-0210)。
文摘Due to the low permeability of tight reservoirs,throats play a significant role in controlling fluid flow.Although many studies have been conducted to investigate fluid flow in throats in the microscale domain,comparatively fewer works have been devoted to study the effect of adsorption boundary layer(ABL)in throats based on the digital rock method.By considering an ABL,we investigate its effects on fluid flow.We build digital rock model based on computed tomography technology.Then,microscopic pore structures are extracted with watershed segmentation and pore geometries are meshed through Delaunay triangulation approach.Finally,using the meshed digital simulation model and finite element method,we investigate the effects of viscosity and thickness of ABL on microscale flow.Our results demonstrate that viscosity and thickness of ABL are major factors that significantly hinder fluid flow in throats.
基金supported by the Major Program Co-sponsored by Province and Ministry(WKJ-ZJ-2210).
文摘Rectal cancer(RC)is one of the most common cancers worldwide.RC has high morbidity and mortality rates,with locally advanced rectal cancer(LARC)accounting for>30%of cases.Patients with LARC are routinely treated with neoadjuvant chemoradiotherapy(nCRT)but treatment outcomes vary greatly.It is crucial to predict and evaluate patient response to nCRT as early as possible.Radiomics is a potentially useful and non-invasive tool for clinical applications in different types of cancer including colorectal cancer.Radiomics has recently been used to predict treatment outcomes and many published studies have demonstrated the efficacy of radiomics.This review will discuss the application of radiomics in predicting of LARC response to nCRT and provide new insight for corollary studies.
文摘There is major interest within the bio-engineering community in developing accurate and non-invasive means for visualizing, modeling and analyzing bone micro-structures. Bones are composed of hierarchical bio-composite materials characterized by complex multi-scale structural geometry. The process of reconstructing a volumetric bone model is usually based upon CT/MRI scanned images. Meshes generated by current commercial CAD systems cannot be used for further modeling or analysis. Moreover, recently developed methods are only capable of capturing the micro-structure for small volumes （biopsy samples）. This paper examines the problem of re-meshing a 3D computerized model of bone micro- structure. The proposed method is based on the following phases： defining sub-meshes of the original model in a grid-based structure, remeshing each sub-mesh using the neural network （NN） method, and merging the sub-meshes into a global mesh. Applying the NN method to micro-structures proved to be quite time consuming. Therefore, a parallel, grid-based approach was applied, yielding a simpler structure in each grid cell. The performance of this method is analyzed, and the method is demonstrated on real bone micro-structures. Furthermore, the method may be used as the basis for generating a multi-resolution bone geometric model.
