A multifrequency magnetic induction tomography system using planar gradiometers: data collection and calibration

Physiological Measurement
Javier Rosell-FerrerHermann Scharfetter

Abstract

We developed a 14-channel multifrequency magnetic induction tomography system (MF-MIT) for biomedical applications. The excitation field is produced by a single coil and 14 planar gradiometers are used for signal detection. The object under measurement was rotated (16 steps per turn) to obtain a full data set for image reconstruction. We make measurements at frequencies from 50 kHz to 1 MHz using a single frequency excitation signal or a multifrequency signal containing several frequencies in this range. We used two acquisition boards giving a total of eight synchronous channels at a sample rate of 5 MS s(-1) per channel. The real and imaginary parts of DeltaB/B(0) were calculated using coherent demodulation at all injected frequencies. Calibration, averaging and drift cancellation techniques were used before image reconstruction. A plastic tank filled with saline (D = 19 cm) and with conductive and/or paramagnetic perturbations was measured for calibration and test purposes. We used a FEM model and an eddy current solver to evaluate the experimental results and to reconstruct the images. Measured equivalent input noise voltage for each channel was 2 nV Hz(-1/2). Using coherent demodulation, with an integration time of 20 ms, t...Continue Reading

References

Dec 1, 1988·IEEE Transactions on Bio-medical Engineering·L W HartR I Joseph
Oct 1, 1968·IEEE Transactions on Bio-medical Engineering·P P Tarjan, R McFee
Jun 18, 1999·Annals of the New York Academy of Sciences·H GriffithsW Gough
Sep 30, 1999·IEEE Transactions on Medical Imaging·N G Gençer, M N Tek
Mar 17, 2000·Physiological Measurement·A KorjenevskyS Sapetsky
Jul 9, 2003·IEEE Transactions on Medical Imaging·Başak Ulker Karbeyaz, Nevzat G Gençer
Jul 10, 2003·IEEE Transactions on Bio-medical Engineering·Hermann ScharfetterJavier Rosell
Mar 31, 2005·Physiological Measurement·Robert MerwaHermann Scharfetter
Mar 31, 2005·Physiological Measurement·C H IgneyO Dössel

❮ Previous
Next ❯

Citations

Jan 14, 2011·Medical & Biological Engineering & Computing·Airton Ramos, Julia G B Wolff
Nov 5, 2010·Biomedical Engineering Online·Kim H Blomqvist, Raimo E Sepponen
Dec 1, 2007·IEEE Transactions on Biomedical Circuits and Systems·M SteffenS Leonhardt
Apr 28, 2017·Physiological Measurement·Jau-Yi WangDilly Anumba
Aug 1, 2007·Physiological Measurement·A V Korjenevsky, T S Tuykin
Jun 12, 2008·Physiological Measurement·M VauhkonenC H Igney
Jun 12, 2008·Physiological Measurement·Matthias SteffenSteffen Leonhardt
Jun 6, 2009·Physiological Measurement·Zheng XuZhanglong Zahng
Jun 10, 2021·Pediatric Research·Sabrina C BehrKonrad Heimann

❮ Previous
Next ❯

Related Concepts

Related Feeds

Cajal Bodies & Gems

Cajal bodies or coiled bodies are dense foci of coilin protein. Gemini of Cajal bodies, or gems, are microscopically similar to Cajal bodies. It is believed that Cajal bodies play important roles in RNA processing while gems assist the Cajal bodies. Find the latest research on Cajal bodies and gems here.