Quantification of edema in human brain tissue by determination of electromagnetic parameters

Reinecke, Tobias; Hagemeier, Lars; Schulte, Verena; Klintschar, Michael; Zimmermann, Stefan

doi:10.1109/icsens.2013.6688477

Cited by 6 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As presented in [11], we performed permittivity measurements on human brain tissue from different probates and brain regions and related these results to the relative humidity of the tissue sample, determined with the moisture analyzer by CEM. The results depicted in Fig.…”

Section: Measurement Resultsmentioning

confidence: 99%

Open-ended coaxial probe for the quantification of edema in human brain tissue

Reinecke

Hagemeier

Spehlbrink

et al. 2014

Sensors and Actuators B: Chemical

View full text Add to dashboard Cite

Section: Measurement Resultsmentioning

confidence: 99%

Open-ended coaxial probe for the quantification of edema in human brain tissue

Reinecke

Hagemeier

Spehlbrink

et al. 2014

Sensors and Actuators B: Chemical

View full text Add to dashboard Cite

“…In transmission line measurement methods, a sample is placed in a coaxial line or, in the case of anisotropic tissue, in a rectangular waveguide so that the field polarisation may be varied. The transmission line is connected to two ports of a Vector Network Analyser (VNA) in order to acquire the scattering parameters (S11 and S21) [ 62 , 87 ], which are then converted into the complex permittivity (dielectric properties) of the tissue. The two most commonly used conversion methods are the Nicolson-Ross-Weir (NRW) method [ 88 , 89 ] and the NIST iterative conversion method [ 90 , 91 ].…”

Section: Measurement Approachesmentioning

confidence: 99%

“…The transmission line method allows measurement over a large frequency range, but only at low temperatures [ 87 , 93 , 94 ]. Waveguides are suitable for measuring larger samples (i.e., samples the size of the waveguide) at frequencies of up to 2.45 GHz, which is the frequency point normally used in microwave ablation.…”

Section: Measurement Approachesmentioning

confidence: 99%

Open-Ended Coaxial Probe Technique for Dielectric Measurement of Biological Tissues: Challenges and Common Practices

et al. 2018

View full text Add to dashboard Cite

Electromagnetic (EM) medical technologies are rapidly expanding worldwide for both diagnostics and therapeutics. As these technologies are low-cost and minimally invasive, they have been the focus of significant research efforts in recent years. Such technologies are often based on the assumption that there is a contrast in the dielectric properties of different tissue types or that the properties of particular tissues fall within a defined range. Thus, accurate knowledge of the dielectric properties of biological tissues is fundamental to EM medical technologies. Over the past decades, numerous studies were conducted to expand the dielectric repository of biological tissues. However, dielectric data is not yet available for every tissue type and at every temperature and frequency. For this reason, dielectric measurements may be performed by researchers who are not specialists in the acquisition of tissue dielectric properties. To this end, this paper reviews the tissue dielectric measurement process performed with an open-ended coaxial probe. Given the high number of factors, including equipment- and tissue-related confounders, that can increase the measurement uncertainty or introduce errors into the tissue dielectric data, this work discusses each step of the coaxial probe measurement procedure, highlighting common practices, challenges, and techniques for controlling and compensating for confounders.

show abstract

“…In [8], we present a preliminary measurement system for the first investigation of the dependence between water content and relative permittivity of human brain tissue. Here, the water content in the tissue is determined via permittivity measurements using a coaxial measuring chamber.…”

Section: Introductionmentioning

confidence: 99%