Cancer Tumour Detection In Brain Phantom Model By Microwave Imaging

Abstract

Paper proposed ultra-wide band circular microstrip patch antenna is designed for interfacing with multilayer brain phantom model with spherical shaped tumour. Initially circular microstrip patch antenna (CMPA) is designed at 5.8GHz for ISM (Industrial scientific and medical band) to detect the tumour. Different types of defect ground structure (DGS) are applied to the CMPA to enhance its bandwidth. CMPA without DGS shows return-loss -10.66dB at 5.8GHz and bandwidth about 500MHz. CMPA with inverted E shaped slit-slot DGS shows return-loss -13.56dB and bandwidth 1.5GHz. Current density and SAR of the CMPA with DGS are 7.826A/m2 and 84.19*103 W/m3 respectively. Multilayer brain phantom model is designed on CST-MWS by considering the dielectric properties of the different layers of the brain as brain, CSF, dura, bone, fat, skin respectively. Designed brain phantom model is interfaced with CMPA with and without tumour. CMPA without tumour with multilayer brain phantom model shows return loss -14.54dB at 5.644GHz. Current density and SAR (Specific absorption rate) of the CMPA without tumour with multilayer brain phantom model is 450.7A/m2 and 186e+03 W/m3 respectively. Spherical shaped tumour has been assumed by the 50mm radius and dielectric constant 50f/m and conductivity 4s/m respectively. CMPA interfaced with multilayer brain phantom model with tumour and it shows return-loss -13.45dB at 5.626GHz. Current density and SAR of the CMPA with multilayer brain phantom model and tumour is 1993A/m2 and 484e+03W/m3 respectively. Increased values of the current density and SAR with tumour truly detect the early presence of tumour. Decline values of the return-loss with tumour also detect the early presence of tumour.