Patients undergoing Magnetic Resonance Imaging (MRI) are exposed to strong, non-uniform static magnetic fields outside of the central imaging region, in which the movement of the body may induce electric currents in t...Patients undergoing Magnetic Resonance Imaging (MRI) are exposed to strong, non-uniform static magnetic fields outside of the central imaging region, in which the movement of the body may induce electric currents in tissues which could possibly be harmful. The purpose of this study was to re-evaluate existing clinical protocols by determining the induced electromagnetic (EM) fields in MRI spine examinations. The study covered 120 MRI spine examinations at the MRI Unit of a hospital in Accra, Ghana. A numerical model based on Faraday’s equation was developed using the finite difference method (FDM) and MATLAB software to compute, first, a test simulation of induced EM field intensities and then actual measurements of induced fields on the spine. The simulation results were peak induced electric field, 0.39 V/m and current density, 0.039 A/m2. Patient results were;calculated maximum velocity, 0.29 m/s;peak induced electric field strength, 0.44 V/m, and current density, 0.043 A/m2. The levels of induced EM-fields were such that they would not pose any potential health hazards to the patients as these values were well below the recommended guidance levels set by the Directive IEC 60601-2-33 of the European Parliament.展开更多
Objective:To optimize the magnetic resonance imaging(MRI)detection process in view of the COVID-19 pandemic,standardize and strengthen the infection control and management MRI rooms.Methods:According to the Technical ...Objective:To optimize the magnetic resonance imaging(MRI)detection process in view of the COVID-19 pandemic,standardize and strengthen the infection control and management MRI rooms.Methods:According to the Technical Guide for COVID-19 Prevention and Control in Medical Institutions(3rd Edition),with reference to the current COVID-19 infection control plan,there are three aspects involved in the planning of MRI examination:MRI room management,medical staff management and protection,and patient management,especially the use of full plastic nose strip medical masks.Infection prevention measures are formulated,scientific prevention and control are made,and accurate policies are implemented.Results:MRI examination was carried out according to the infection control and management of MRI room plan during the epidemic,so as to ensure the safety of examination,the safety of patients and the safety of medical staff and no cross infection in hospital.Conclusion:The implementation of proper infection prevention measures during MRI examination in light of COVID-19 ensures that patients wear medical surgical masks with full plastic nose strips throughout the process to avoid cross-infection,ensure the safety of doctors and patients,and maintain the health of the population.展开更多
Routine use of Magnetic Resonance Imaging (MRI) as screening test after </span><span style="font-family:Verdana;">clinical diagnosis for meniscal and/or anterior cruciate ligament</span><...Routine use of Magnetic Resonance Imaging (MRI) as screening test after </span><span style="font-family:Verdana;">clinical diagnosis for meniscal and/or anterior cruciate ligament</span></span></span><span><span><span style="font-family:""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">(ACL) has a detrimental effect on patients in limited resourced countries. This study was done to compare accuracy of clinical examination and that of (MRI) on diagnosing meniscal and or</span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">(ACL) tears. </span><b><span style="font-family:Verdana;">Methodology</span></b><span style="font-family:Verdana;">: A cross-sectional-descriptive </span></span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">study was done on 57 knees of patients. Clinical examination, MRI and then diagnostic arthroscopy, as the gold standard, were done to all the cases. Results were recorded;the accuracies of MRI and clinical examination were evaluated and their results were compared. </span><b><span style="font-family:Verdana;">Results:</span></b><span style="font-family:Verdana;"> Median age of patients was 40 </span><span style="font-family:Verdana;">years. Clinical examination had sensitivity of 93.62% and specificity of 40% f</span><span style="font-family:Verdana;">or diagnosing meniscal tears;and sensitivity of 100%;and specificity of 97.67% for diagnosing ACL tear. MRI had sensitivity of 85.11%, and specificity of 40% for meniscal tear diagnosis and 71% and 100% respectively for ACL tear diagnosis. Diagnostic accuracy was 84.21% for meniscal and 98.24% for ACL tears by clinical examination and by MRI w</span></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">as</span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;"> 77.19% and 92.98% respectively. </span><b><span style="font-family:Verdana;">Conclusion:</span></b><span style="font-family:Verdana;"> Clinical examination has higher accuracy than MRI on diagnosing both ACL and meniscal tear. Thus patients may be scheduled for diagnostic and interventional arthroscopy if clinical examination reveals </span><span style="font-family:Verdana;">meniscal and or ACL injuries. MRI use should be reserved when clinical e</span><span style="font-family:Verdana;">valuation is inconclusive or cannot be done.展开更多
文摘Patients undergoing Magnetic Resonance Imaging (MRI) are exposed to strong, non-uniform static magnetic fields outside of the central imaging region, in which the movement of the body may induce electric currents in tissues which could possibly be harmful. The purpose of this study was to re-evaluate existing clinical protocols by determining the induced electromagnetic (EM) fields in MRI spine examinations. The study covered 120 MRI spine examinations at the MRI Unit of a hospital in Accra, Ghana. A numerical model based on Faraday’s equation was developed using the finite difference method (FDM) and MATLAB software to compute, first, a test simulation of induced EM field intensities and then actual measurements of induced fields on the spine. The simulation results were peak induced electric field, 0.39 V/m and current density, 0.039 A/m2. Patient results were;calculated maximum velocity, 0.29 m/s;peak induced electric field strength, 0.44 V/m, and current density, 0.043 A/m2. The levels of induced EM-fields were such that they would not pose any potential health hazards to the patients as these values were well below the recommended guidance levels set by the Directive IEC 60601-2-33 of the European Parliament.
基金Medical Science Research Program of Hebei Province:Analysis and Prevention and Control of Drug Resistance of Main Pathogenic Bacteria in Third-Class A Hospitals in the Recent 3 Years(No.20210845)Hebei University Affiliated Hospital:The Effect of Improving Hand Hygiene of Medical Staff on Nosocomial Infection During the Normalization Period of the Pandemic 2021(2021Z010)+1 种基金National Natural Science Foundation of China:Interaction of NEDD4L with eEF1A1 in VEC Autophagy and Tumor Angiogenesis Via Ubiquitination Activity(No.82103181)Natural Science Foundation of Hebei Province:Study on the Role of Sal-Mir-58 in Transspecies Regulation KLF3 in the Proliferation and Migration of Vascular Endothelial Cells(No.C2020201052)。
文摘Objective:To optimize the magnetic resonance imaging(MRI)detection process in view of the COVID-19 pandemic,standardize and strengthen the infection control and management MRI rooms.Methods:According to the Technical Guide for COVID-19 Prevention and Control in Medical Institutions(3rd Edition),with reference to the current COVID-19 infection control plan,there are three aspects involved in the planning of MRI examination:MRI room management,medical staff management and protection,and patient management,especially the use of full plastic nose strip medical masks.Infection prevention measures are formulated,scientific prevention and control are made,and accurate policies are implemented.Results:MRI examination was carried out according to the infection control and management of MRI room plan during the epidemic,so as to ensure the safety of examination,the safety of patients and the safety of medical staff and no cross infection in hospital.Conclusion:The implementation of proper infection prevention measures during MRI examination in light of COVID-19 ensures that patients wear medical surgical masks with full plastic nose strips throughout the process to avoid cross-infection,ensure the safety of doctors and patients,and maintain the health of the population.
文摘Routine use of Magnetic Resonance Imaging (MRI) as screening test after </span><span style="font-family:Verdana;">clinical diagnosis for meniscal and/or anterior cruciate ligament</span></span></span><span><span><span style="font-family:""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">(ACL) has a detrimental effect on patients in limited resourced countries. This study was done to compare accuracy of clinical examination and that of (MRI) on diagnosing meniscal and or</span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">(ACL) tears. </span><b><span style="font-family:Verdana;">Methodology</span></b><span style="font-family:Verdana;">: A cross-sectional-descriptive </span></span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">study was done on 57 knees of patients. Clinical examination, MRI and then diagnostic arthroscopy, as the gold standard, were done to all the cases. Results were recorded;the accuracies of MRI and clinical examination were evaluated and their results were compared. </span><b><span style="font-family:Verdana;">Results:</span></b><span style="font-family:Verdana;"> Median age of patients was 40 </span><span style="font-family:Verdana;">years. Clinical examination had sensitivity of 93.62% and specificity of 40% f</span><span style="font-family:Verdana;">or diagnosing meniscal tears;and sensitivity of 100%;and specificity of 97.67% for diagnosing ACL tear. MRI had sensitivity of 85.11%, and specificity of 40% for meniscal tear diagnosis and 71% and 100% respectively for ACL tear diagnosis. Diagnostic accuracy was 84.21% for meniscal and 98.24% for ACL tears by clinical examination and by MRI w</span></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">as</span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;"> 77.19% and 92.98% respectively. </span><b><span style="font-family:Verdana;">Conclusion:</span></b><span style="font-family:Verdana;"> Clinical examination has higher accuracy than MRI on diagnosing both ACL and meniscal tear. Thus patients may be scheduled for diagnostic and interventional arthroscopy if clinical examination reveals </span><span style="font-family:Verdana;">meniscal and or ACL injuries. MRI use should be reserved when clinical e</span><span style="font-family:Verdana;">valuation is inconclusive or cannot be done.
