Frequency-Dependent Contrast Enhancement for Conductive and Non-Conductive Materials in Electrical Impedance Tomography. - Nguyen Diep, Quoc Tuan; Huynh, Hoang Nhut; Cao Dinh, Minh Quan; Huynh, Thanh Ven; Tran, Anh Tu; Tran, Trung Nghia (Applied Sciences (2076-3417), 2024)