This paper reports on a novel system architecture for measuring impedance spectra of a
biological tissue close to the tip of a hollow needle. The measurement is performed online
using fast broadband chirp signals. The time domain measurement raw data are
transformed into the transfer function of the tissue in frequency domain. Correlation
technique is used to analyze the characteristic shape of the derived tissue transfer function
with respect to known “library functions” for different types of tissue derived in earlier …

… A Novel Methodology for Assessing the Bounded-Input Bounded-Output Instability in QT
Interval Dynamics: Application to Clinical ECG With Ventricular Tachycardia . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . X. Chen and NA Trayanova … Switchable Faraday Shielding
With Application to Reducing the Pain of Internal Cardiac Defibrillation While Permitting …
Online Tissue Discrimination for Transcutaneous Needle Guidance Applications Using
Broadband Impedance …