title: A wideband microwave tomography system with a novel frequency selection procedure.
abstract: In this paper, we describe a 2-D wideband microwave imaging system intended for biomedical imaging. The system is capable of collecting data from 3 to 6 GHz, with 24 coresident antenna elements connected to a vector network analyzer via a 2 x 24 port matrix switch. As one of the major sources of error in the data collection process is a result of the strongly coupling 24 coresident antennas, we provide a novel method to avoid the frequencies where the coupling is large enough to prevent successful imaging. Through the use of two different nonlinear reconstruction schemes, which are an enhanced version of the distorted born iterative method and the multiplicative regularized contrast source inversion method, we show imaging results from dielectric phantoms in free space. The early inversion results show that with the frequency selection procedure applied, the system is capable of quantitatively reconstructing dielectric objects, and show that the use of the wideband data improves the inversion results over single-frequency data.
authors.affiliation: Department of Electrical and Computer Engineering, University of Manitoba, Winnipeg, MB R3T 2N2, Canada. cgilmore@ee.umanitoba.ca
authors.forename: Colin
authors.initials: C
authors.lastname: Gilmore
authors.forename: Puyan
authors.initials: P
authors.lastname: Mojabi
authors.forename: Amer
authors.initials: A
authors.lastname: Zakaria
authors.forename: Majid
authors.initials: M
authors.lastname: Ostadrahimi
authors.forename: Cameron
authors.initials: C
authors.lastname: Kaye
authors.forename: Sima
authors.initials: S
authors.lastname: Noghanian
authors.forename: Lotfollah
authors.initials: L
authors.lastname: Shafai
authors.forename: Stephen
authors.initials: S
authors.lastname: Pistorius
authors.forename: Joe
authors.initials: J
authors.lastname: LoVetri
mesh_terms: D000465:Algorithms; D007091:Image Processing, Computer-Assisted; D008872:Microwaves; D017711:Nonlinear Dynamics; D019047:Phantoms, Imaging; D012815:Signal Processing, Computer-Assisted; D014054:Tomography / Q000379:methods*