Skin impedance
Published in Journal of Electrical Bioimpedance
Statistical methods for bioimpedance analysis
Published in Journal of Electrical Bioimpedance
This paper gives a basic overview of relevant statistical methods for the analysis of bioimpedance measurements, with an aim to answer questions such as: How do I begin with planning an experiment? How many measurements do I need to take? How do I deal with large amounts of frequency sweep data? Which statistical test should I use, and how do I val...
Comparison of cardiac time intervals between echocardiography and impedance cardiography at various heart rates
Published in Journal of Electrical Bioimpedance
The non-invasively measured initial systolic time interval (ISTI) reflects a time difference between the electrical and pumping activity of the heart and depends on cardiac preload, afterload, autonomic nervous control and training level. However, the duration of the ISTI has not yet been compared to other time markers of the heart cycle. The prese...
Simplified estimation of membrane potentials induced by high-frequency electric signals
Published in Journal of Electrical Bioimpedance
In this paper we show why the poorly conducting cytoplasmic membranes have little effect on the overall impedance of the tissue above a certain frequency, and derive an estimate of this upper frequency. It is further shown that the induced transmembrane potentials at different sites over the membrane can be found through a simple formula for freque...
Electrical characterization of bolus material as phantom for use in electrical impedance and computed tomography fusion ...
Published in Journal of Electrical Bioimpedance
Phantoms are widely used in medical imaging to predict image quality prior to clinical imaging. This paper discusses the possible use of bolus material, as a conductivity phantom, for validation and interpretation of electrical impedance tomography (EIT) images. Bolus is commonly used in radiation therapy to mimic tissue. When irradiated, it has ra...
The feasibility of using compression bioimpedance measurements to quantify peripheral edema
Published in Journal of Electrical Bioimpedance
The accurate assessment of body fluid volume is important in many clinical situations, especially in the determination of “dry weight” in a dialysis setting. Currently, no clinically applicable diagnostic system exists to determine the mechanical properties that accurately characterize peripheral edema in an objective and quantitative manner. We ha...
Modelling the Ability of Rheoencephalography to Measure Cerebral Blood Flow
Published in Journal of Electrical Bioimpedance
Despite the long history of rheoencephalography (REG), some important aspects of the method are still debatable. Bioimpedance measurements offer great potential benefit for study of the human brain, but the traditional four or six electrode method suffers from potential misinterpretations and lack of accuracy. The objective of this paper is to stud...
Electrical bioimpedance spectroscopy in time-variant systems: Is undersampling always a problem?
Published in Journal of Electrical Bioimpedance
During the last decades, Electrical Bioimpedance Spectroscopy (EBIS) has been applied mainly by using the frequency-sweep technique, across a range of many different applications. Traditionally, the tissue under study is considered to be time-invariant and dynamic changes of tissue activity are ignored by treating the changes as a noise source. A n...
Impedance Ratio Method for Urine Conductivity-Invariant Estimation of Bladder Volume
Published in Journal of Electrical Bioimpedance
Non-invasive estimation of bladder volume could help patients with impaired bladder volume sensation to determine the right moment for catheterisation. Continuous, non-invasive impedance measurement is a promising technology in this scenario, although influences of body posture and unknown urine conductivity limit wide clinical use today. We studie...
Biomass measurement of living Lumbriculus variegatus with impedance spectroscopy
Published in Journal of Electrical Bioimpedance
Impedance spectroscopy is a useful tool for non-invasive and real time measurements of cell suspensions and a variety of biological tissues. The objective of this study was the investigation of the dielectric properties of living aquatic worms (Lumbriculus variegatus) using impedance spectroscopy in a frequency range between 100 Hz and 10 MHz. We d...
