Acoustic emission test and CT scanning are important techniques in the study of coal crack propagation. A uniaxial compression test was performed on coal samples by integrating CT and acoustic emission. The test compa...Acoustic emission test and CT scanning are important techniques in the study of coal crack propagation. A uniaxial compression test was performed on coal samples by integrating CT and acoustic emission. The test comparison analyzes the acoustic emission load and CT images for an effective observation on the entire process, from crack propagation to the samples＇ destruction. The box dimension of the coal samples＇ acoustic emission series and the CT images were obtained through calculations by using the authors＇ own program. The results show that the fractal dimension of both the acoustic emission energy and CT image increase rapidly, indicating coal and rock mass has entered a dangerous condition. Hence, measures should be taken to unload the pressure of the coal and rock mass. The test results provide intuitive observation data for the coal meso-damage model. The test contributes to in-depth studies of coal or rock crack propagation mechanisms and provides a theoretical basis for rock burst mechanism.展开更多
Background: Detection of malignant liver mass is very important for the treatment modalities. Objective: The purpose of the present study was to establish the usefulness of CT scan in the diagnosis of malignant hepati...Background: Detection of malignant liver mass is very important for the treatment modalities. Objective: The purpose of the present study was to establish the usefulness of CT scan in the diagnosis of malignant hepatic mass. Methodology: This cross sectional study was carried out in the Department of Radiology and Imaging at Mymensingh Medical College Hospital (MMCH), Mymensingh, Banghabandhu Sheikh Mujib Medical University (BSMMU), Dhaka and Dhaka Medical College Hospital (DMCH), Dhaka during the period of 1st January 2006 to 31st December 2007. Patients admitted in the Department of Medicine and Department of Hepatobiliary of MMCH, BSMMU, and DMCH with the clinical diagnosis of fever, abdominal pain, anorexia, nausea/vomiting, loss of appetite, jaundice, weight loss and ascites were selected as study population. CT scan and histopathology were performed to all the patients. Result: A total number of 50 patients were recruited for this study. Mean age of all patients was 51.28 ± 14 years with a range of 17 year to 78 years. Among all patients 28 had multiple lesion, of them 71.4% was malignant and 28.6% was benign. On the other side 22 patients had solitary lesion, of them 36.4% was malignant and 63.6% was benign展开更多
目的研究电子计算机断层扫描(computed tomography,CT)以及核磁共振成像(nuclear magnetic resonance imaging,MRI)诊断膝关节损伤的价值。方法选取2021年1月—2023年2月于南京市六合区人民医院放射科检查的164例疑似膝关节损伤患者为...目的研究电子计算机断层扫描(computed tomography,CT)以及核磁共振成像(nuclear magnetic resonance imaging,MRI)诊断膝关节损伤的价值。方法选取2021年1月—2023年2月于南京市六合区人民医院放射科检查的164例疑似膝关节损伤患者为研究对象,经关节镜检测作为金标准确诊,其中膝关节损伤患者82例。对所有研究对象予以CT检测以及MRI检测,收集并分析不同检测方式的准确度、特异度、灵敏度以及不同膝关节损伤类型检出数据。结果MRI检测准确度为98.78%、特异度为98.78%、灵敏度为98.78%;CT检测准确度为88.41%、特异度为90.24%、灵敏度为86.59%;在82例膝关节损伤中检测出骨质改变9例,半月板损伤16例,内侧副韧带损伤10例,外侧副韧带损伤11例,前交叉韧带损伤12例,后交叉韧带损伤12例,关节腔积液12例。MRI检测对半月板损伤类型诊断符合率高于CT检测,差异有统计学意义(P<0.05)。两种检测方法其余类型诊断符合率比较,差异无统计学意义(P>0.05)。结论在针对膝关节损伤进行检测时,选择MRI检测能够提高诊断的准确性,能够针对不同膝关节损伤予以鉴别,建议在实际诊断中予以参考。展开更多
基金National Key Research and Development Project during the 14th Five-year Plan Period(2023YFF0905800)Science and Technology Program of Jiangxi Provincial Education Department(GJJ160879)。
文摘Acoustic emission test and CT scanning are important techniques in the study of coal crack propagation. A uniaxial compression test was performed on coal samples by integrating CT and acoustic emission. The test comparison analyzes the acoustic emission load and CT images for an effective observation on the entire process, from crack propagation to the samples＇ destruction. The box dimension of the coal samples＇ acoustic emission series and the CT images were obtained through calculations by using the authors＇ own program. The results show that the fractal dimension of both the acoustic emission energy and CT image increase rapidly, indicating coal and rock mass has entered a dangerous condition. Hence, measures should be taken to unload the pressure of the coal and rock mass. The test results provide intuitive observation data for the coal meso-damage model. The test contributes to in-depth studies of coal or rock crack propagation mechanisms and provides a theoretical basis for rock burst mechanism.
文摘Background: Detection of malignant liver mass is very important for the treatment modalities. Objective: The purpose of the present study was to establish the usefulness of CT scan in the diagnosis of malignant hepatic mass. Methodology: This cross sectional study was carried out in the Department of Radiology and Imaging at Mymensingh Medical College Hospital (MMCH), Mymensingh, Banghabandhu Sheikh Mujib Medical University (BSMMU), Dhaka and Dhaka Medical College Hospital (DMCH), Dhaka during the period of 1st January 2006 to 31st December 2007. Patients admitted in the Department of Medicine and Department of Hepatobiliary of MMCH, BSMMU, and DMCH with the clinical diagnosis of fever, abdominal pain, anorexia, nausea/vomiting, loss of appetite, jaundice, weight loss and ascites were selected as study population. CT scan and histopathology were performed to all the patients. Result: A total number of 50 patients were recruited for this study. Mean age of all patients was 51.28 ± 14 years with a range of 17 year to 78 years. Among all patients 28 had multiple lesion, of them 71.4% was malignant and 28.6% was benign. On the other side 22 patients had solitary lesion, of them 36.4% was malignant and 63.6% was benign
文摘目的研究电子计算机断层扫描(computed tomography,CT)以及核磁共振成像(nuclear magnetic resonance imaging,MRI)诊断膝关节损伤的价值。方法选取2021年1月—2023年2月于南京市六合区人民医院放射科检查的164例疑似膝关节损伤患者为研究对象,经关节镜检测作为金标准确诊,其中膝关节损伤患者82例。对所有研究对象予以CT检测以及MRI检测,收集并分析不同检测方式的准确度、特异度、灵敏度以及不同膝关节损伤类型检出数据。结果MRI检测准确度为98.78%、特异度为98.78%、灵敏度为98.78%;CT检测准确度为88.41%、特异度为90.24%、灵敏度为86.59%;在82例膝关节损伤中检测出骨质改变9例,半月板损伤16例,内侧副韧带损伤10例,外侧副韧带损伤11例,前交叉韧带损伤12例,后交叉韧带损伤12例,关节腔积液12例。MRI检测对半月板损伤类型诊断符合率高于CT检测,差异有统计学意义(P<0.05)。两种检测方法其余类型诊断符合率比较,差异无统计学意义(P>0.05)。结论在针对膝关节损伤进行检测时,选择MRI检测能够提高诊断的准确性,能够针对不同膝关节损伤予以鉴别,建议在实际诊断中予以参考。
