Title :
Electrical safety for an electrical impedance tomograph
Author :
Ghahary, Ali ; Webster, John G.
Author_Institution :
Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA
Abstract :
The electrical safety requirements for patient lead currents in medical electrical equipment are reviewed. The standards set by four organizations are compared. These are the National Fire Protection Association (NFPA), the Association for the Advancement of Medical Instrumentation (AAMI), Underwriters Laboratories (UL), and the International Electrotechnical Commission (IEC). Patient lead current classification, lead-to-ground leakage and risk currents, and leakage between patient leads are discussed. Isolation transformers and optoisolators are proposed for use in an electrical impedance tomograph to meet these requirements
Keywords :
bioelectric phenomena; biomedical equipment; computerised tomography; safety; Association for the Advancement of Medical Instrumentation; International Electrotechnical Commission; National Fire Protection Association; Underwriters Laboratories; electrical impedance tomograph; electrical safety requirements; isolation transformers; lead-to-ground leakage; leakage between patient leads; medical diagnostic imaging; medical electrical equipment; medical equipment; optoisolators; patient lead currents; risk currents; Electrical safety; Frequency; IEC standards; Impedance; Instruments; Leakage current; Safety devices; Standards organizations; Terminology; Transformers;
Conference_Titel :
Engineering in Medicine and Biology Society, 1989. Images of the Twenty-First Century., Proceedings of the Annual International Conference of the IEEE Engineering in
Conference_Location :
Seattle, WA
DOI :
10.1109/IEMBS.1989.95819
