Implementation of a data acquisition system for contactless conductivity imaging

Date

2001-10-28

Author

ULKER, B
Gençer, Nevzat Güneri

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A data acquisition system is realized to image electrical conductivity of biological tissues via contactless measurements. This system uses magnetic excitation to induce currents inside the body and measures the magnetic fields of the induced currents. A magnetically coupled differential coil system is scanned on the conductive object by a computer controlled scanning system. A data acquisition system is constructed using a PC controlled lock-in amplifier. 1.64V secondary voltage difference can be measured for 0.6 S/m solution. The average data acquisition time is 4.67 sec/mm(2). 8 mm diameter objects with conductivity 0.2 S/m can be detected with this system.

Subject Keywords

Electrical conductivity, Medical imaging, Magnetic induction

URI

https://hdl.handle.net/11511/54091

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Department of Electrical and Electronics Engineering, Conference / Seminar

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Implementation of a data acquisition system for contactless conductivity imaging Ulker, B; Gençer, Nevzat Güneri (2002-09-01) 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...
Analysis of reconstruction performance of magnetic resonance conductivity tensor imaging (MRCTI) using simulated measurements DEĞİRMENCİ, EVREN; Eyüboğlu, Behçet Murat (2017-01-01) Magnetic resonance conductivity tensor imaging (MRCTI) was proposed recently to produce electrical conductivity images of anisotropic tissues. Similar to magnetic resonance electrical impedance tomography (MREIT), MRCTI uses magnetic field and boundary potential measurements obtained utilizing magnetic resonance imaging techniques. MRCTI reconstructs tensor images of anisotropic conductivity whereas MREIT reconstructs isotropic conductivity images. In this study, spatial resolution and linearity of five rec...
Electrical conductivity Imaging via contactless measurements: An experimental study KARBEYAZ, BAŞAK ÜLKER; Gençer, Nevzat Güneri (Institute of Electrical and Electronics Engineers (IEEE), 2003-05-01) A data-acquisition system has been developed to image electrical conductivity of biological tissues via contactless measurements. This system uses magnetic excitation to induce currents inside the body and measures the resulting magnetic fields. The data-acquisition system is constructed using a PC-controlled lock-in amplifier instrument. A magnetically coupled differential coil is used to scan conducting phantoms by a computer controlled scanning system. A 10000-turn differential coil system with circular ...
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Electrical conductivity imaging via contactless measurements Gençer, Nevzat Güneri (Institute of Electrical and Electronics Engineers (IEEE), 1999-07-01) A new imaging modality is introduced to image electrical conductivity of biological tissues via contactless measurements. This modality uses magnetic excitation to induce currents inside the body and measures the magnetic fields of the induced currents. In this study, the mathematical basis of the methodology is analyzed and numerical models are developed to simulate the imaging system. The induced currents are expressed using the (A) over right arrow-phi formulation of the electric field where (A) over rig...

Citation Formats

B. ULKER and N. G. Gençer, “Implementation of a data acquisition system for contactless conductivity imaging,” 2001, vol. 23, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/54091.