Focused Impedance Measurement (FIM) is a recent technique for quantifying the electrical resistance in tissues of the human body with improved zone localization compared to conventional methods. This method was proposed and developed by Department of Biomedical Physics and Technology of University of Dhaka under the supervision of Prof. Khondkar Siddique-e-Rabbani;[1][2] who first introduced the idea. FIM can be considered a bridge between Four Electrode Impedance Measurement (FEIM) and Electrical impedance Tomography (EIT), and provides a middle ground in terms of simplicity and accuracy.
Focused impedance measurement
Purpose
quantifying the electrical resistance in tissues
Many biological parameters and processes can be detected and monitored through their effects on bioimpedance. Bioimpedance measurement can be performed with a few simple instruments and non-invasively.
Measurement of electrical impedance to obtain physiological or diagnostic information has been of interest to researchers for many years. However, the human body is geometrically and conductively uneven, with variation between individuals and phases of normal body activity, and bioimpedance results from many factors, including ion concentrations, cell geometry, extra-cellular fluids, intra-cellular fluids, and organ geometry. This makes accurate analysis of results from a small number of electrodes difficult and unreliable. Identifying zones with specific impedances can provide greater certainty regarding the factors behind the impedance.
Conventional Four Electrode or Tetra-polar Impedance Measurement (TPIM) is simple, but the zone of sensitivity is not well defined and may include organs other that those of interest, making interpretation difficult and unreliable. On the other hand, Electrical impedance tomography (EIT) offers reasonable resolution, but is complex and require many electrodes. By placing two FEIM systems perpendicular to each other over a common zone at the center and combining the results,[3] it is possible to obtain enhanced sensitivity over this central zone. This is the basis of FIM, which may be useful for impedance measurements of large organs like stomach, heart, and lungs. Being much simpler in comparison to EIT, multifrequency systems can be simply built for FIM.
FIM may be useful in other fields where impedance measurements are performed, like geology.
^K S Rabbani; M Sarker; M H R Akond; T Akter (1999). "Focused Impedance Measurement (FIM): A New Technique with Improved Zone Localization". Annals of the New York Academy of Sciences. 873 (1): 408–420. Bibcode:1999NYASA.873..408R. doi:10.1111/j.1749-6632.1999.tb09490.x. PMID 10372184. S2CID 80628.
^Ferdous, Humaya; Tanvir Noor Baig; K. Siddique-e Rabbani (28 December 2013). "Thorax mapping for localized lung impedance change using focused impedance measurement (FIM): A pilot study". Electrical Bioimpedance. 4: 57–61. doi:10.5617/jeb.778. S2CID 55005285. Retrieved 14 February 2014.
May 03, 2024
focused, impedance, measurement, this, article, multiple, issues, please, help, improve, discuss, these, issues, talk, page, learn, when, remove, these, template, messages, this, article, confusing, unclear, readers, please, help, clarify, article, there, migh. This article has multiple issues Please help improve it or discuss these issues on the talk page Learn how and when to remove these template messages This article may be confusing or unclear to readers Please help clarify the article There might be a discussion about this on the talk page September 2008 Learn how and when to remove this message This article relies excessively on references to primary sources Please improve this article by adding secondary or tertiary sources Find sources Focused impedance measurement news newspapers books scholar JSTOR March 2008 Learn how and when to remove this message Learn how and when to remove this message Focused Impedance Measurement FIM is a recent technique for quantifying the electrical resistance in tissues of the human body with improved zone localization compared to conventional methods This method was proposed and developed by Department of Biomedical Physics and Technology of University of Dhaka under the supervision of Prof Khondkar Siddique e Rabbani 1 2 who first introduced the idea FIM can be considered a bridge between Four Electrode Impedance Measurement FEIM and Electrical impedance Tomography EIT and provides a middle ground in terms of simplicity and accuracy Focused impedance measurementPurposequantifying the electrical resistance in tissues Many biological parameters and processes can be detected and monitored through their effects on bioimpedance Bioimpedance measurement can be performed with a few simple instruments and non invasively Measurement of electrical impedance to obtain physiological or diagnostic information has been of interest to researchers for many years However the human body is geometrically and conductively uneven with variation between individuals and phases of normal body activity and bioimpedance results from many factors including ion concentrations cell geometry extra cellular fluids intra cellular fluids and organ geometry This makes accurate analysis of results from a small number of electrodes difficult and unreliable Identifying zones with specific impedances can provide greater certainty regarding the factors behind the impedance Conventional Four Electrode or Tetra polar Impedance Measurement TPIM is simple but the zone of sensitivity is not well defined and may include organs other that those of interest making interpretation difficult and unreliable On the other hand Electrical impedance tomography EIT offers reasonable resolution but is complex and require many electrodes By placing two FEIM systems perpendicular to each other over a common zone at the center and combining the results 3 it is possible to obtain enhanced sensitivity over this central zone This is the basis of FIM which may be useful for impedance measurements of large organs like stomach heart and lungs Being much simpler in comparison to EIT multifrequency systems can be simply built for FIM FIM may be useful in other fields where impedance measurements are performed like geology See also editImpedance cardiographyReferences edit K S Rabbani M Sarker M H R Akond T Akter 1999 Focused Impedance Measurement FIM A New Technique with Improved Zone Localization Annals of the New York Academy of Sciences 873 1 408 420 Bibcode 1999NYASA 873 408R doi 10 1111 j 1749 6632 1999 tb09490 x PMID 10372184 S2CID 80628 BAS Gold Medal Award Ceremony 2011 Archived 2013 07 29 at the Wayback Machine Bangladesh Academy of Sciences Ferdous Humaya Tanvir Noor Baig K Siddique e Rabbani 28 December 2013 Thorax mapping for localized lung impedance change using focused impedance measurement FIM A pilot study Electrical Bioimpedance 4 57 61 doi 10 5617 jeb 778 S2CID 55005285 Retrieved 14 February 2014 Retrieved from https en wikipedia org w index php title Focused impedance measurement amp oldid 1136164870, wikipedia, wiki, book, books, library,
