Development of a data acquisition system for electrical conductivity images of biological tissues via contactless measurements

The data acquisition system of a new medical imaging system is developed and system performance is presented. The ultimate aim of the system is to image electrical conductivity of biological tissues via contactless measurements. Two different measurement systems are designed based upon measurement of impedance change of an eddy current type sensor. The first design (based upon excitation of a single coil probe) gives 100Hz output frequency change for a conductivity change of 1.9mS/cm and is tested at high frequency (1.4 MHz). Second design (based on one excitation and one receiving coil) operates at low frequency (15KHz) and gives 18 muV change in output voltage for similar conductivity variation. Field images of 30mm diameter cylindrical object were obtained while scanning a region of 225cm(2). The sensitivities of the two systems show a possible wide scale use of these systems for measurement, monitoring and imaging of local conductivity variations in biological tissues.


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In this paper, we focus on the human activity recognition module of a homecare system that consists of wireless sensors developed for remotely monitoring patients with cognitive disorders, such as Alzheimer. To this end, as an initial study, we designed a smart couch that is equipped with accelerometer, vibration and force resistive sensors to monitor how much time people spend while sitting, lying or napping on the couch and to recognize the drifts from their daily routines. In order to distinguish these a...
IDER, YZ; DORKEN, E; Gençer, Nevzat Güneri; KOYMEN, H (1989-11-12)
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A data acquisition system is realized for conductivity imaging via contactless measurements. It is observed that field profiles are good representatives of the conductive objects scanned by the measurement system. Three different data sets are taken with different scanning resolutions. Note that although the scanning resolution is decreased 25 times, it is still possible to observe the conductive object. The data acquisition time is due to the data acquisition time limit of the lock-in amplifier. As might b...
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Onuker, Gamz; Gençer, Nevzat G..; Department of Electrical and Electronics Engineering (2019)
Lately, in biomedical imaging systems, algorithms for providing the temperature data became more important both for diagnosis and for treatment. Aiming to serve this purpose, in this thesis study, it is planned to estimate the temperature data using magnetic nanoparticles; which are actually imaging tracers used in a new medical imaging modality, Magnetic Particle Imaging (MPI). Since the introduction of MPI, the effect of temperature changes on magnetic nanoparticles (MNPs) and their magnetic behavior, is ...
Haptic device design
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Haptic devices are used to provide multi-modal data transfer between haptic users and computers in virtual reality applications. They enable humans to take force and tactile feedback from any virtual or remote objects. Haptic devices also facilitate the use of data collected from a real object in the virtual environment. Usage of the haptic devices increase more and more in industrial, educational and medical applications in parallel with development of virtual reality technology. As virtual reality technol...
Citation Formats
T. Ahmad and N. G. Gençer, “Development of a data acquisition system for electrical conductivity images of biological tissues via contactless measurements,” 2001, vol. 23, Accessed: 00, 2020. [Online]. Available: