title: An electrical impedance spectroscopy system for breast cancer detection.
abstract: This paper describes Rensselaer's ACT 4 electrical impedance tomography system which has been developed for breast cancer detection. ACT 4 acquires electrical impedance data at a set of discrete frequencies in the range from 3.33 kHz to 1 MHz and can support up to 72 electrodes. The instrument applies either voltages or currents to all the electrodes simultaneously and measures the resulting currents and/or voltages. Radiolucent electrode arrays are applied to the compression plates of an x-ray mammography system for collecting impedance data in register with x-ray images. The analog front-end electronics are supported with a distributed digital system, including a computer, Digital Signal Processors (DSPs) and Field-Programmable Gate Arrays (FPGAs). A Microsoft Visual C/C++ -based user interface controls the system operation. The overall system architecture is presented as well as performance results.
authors.affiliation: Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA. saulng@rpi.edu
authors.forename: Gary J
authors.initials: GJ
authors.lastname: Saulnier
authors.forename: Ning
authors.initials: N
authors.lastname: Liu
authors.forename: Chandana
authors.initials: C
authors.lastname: Tamma
authors.forename: Hongjun
authors.initials: H
authors.lastname: Xia
authors.forename: Tzu-Jen
authors.initials: TJ
authors.lastname: Kao
authors.forename: J C
authors.initials: JC
authors.lastname: Newell
authors.forename: David
authors.initials: D
authors.lastname: Isaacson
mesh_terms: D001943:Breast Neoplasms / Q000175:diagnosis* / Q000473:pathology; D017097:Electric Impedance; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008327:Mammography / Q000295:instrumentation / Q000379:methods; D012815:Signal Processing, Computer-Assisted; D012984:Software; D013057:Spectrum Analysis / Q000295:instrumentation / Q000379:methods*; D014054:Tomography / Q000295:instrumentation / Q000379:methods*; D014584:User-Computer Interface