Metamaterial inspired Vivaldi antennas for microwave imaging of realistic breast phantom

Md. Tarikul Islam (P94299)

Please use this identifier to cite or link to this item: https://ptsldigital.ukm.my/jspui/handle/123456789/457815

Full metadata record

DC Field	Value	Language
dc.contributor.advisor	Mohammad Tariqul Islam, Prof. Dr.
dc.contributor.author	Md. Tarikul Islam (P94299)
dc.date.accessioned	2023-09-12T09:13:49Z	-
dc.date.available	2023-09-12T09:13:49Z	-
dc.date.issued	2020-09-02
dc.identifier.other	ukmvital:122840
dc.identifier.uri	https://ptsldigital.ukm.my/jspui/handle/123456789/457815	-
dc.description	Breast tumors are responsible for one of the most common kinds of cancer in the globe. The major aspect in a successful medication is to reliably diagnose at early stages. Furthermore, the conventional clinical diagnosis techniques such as X-ray, ultrasound, and MRI, have the limitations such as cost and reliability. The limitations lead the researchers for alternative, effective, low-cost diagnostic techniques that involve lower ionization. Microwave Imaging (MI) has been proved to be a reliable health monitoring approach that can play a fundamental role in diagnosing tumor in breast tissue for its low-cost, non-invasiveness and high image resolution characteristics. The objective of this research is to design and develop several Vivaldi antennas for microwave imaging of realistic breast phantom using metamaterial structures. Firstly, three Vivaldi antenna designs are developed and fabricated according to the requirements of the MI application. One of them is basic Vivaldi antenna with slot at the bottom radiator and another two embedded with single negative (SN) and index near zero (INZ) metamaterial unit cell. Another two with comparatively large dimension and one of them is loaded with INZ metamaterial. By using metamaterial unit cells, most of the radiated power can be focused on the region of interest and decrease the apparent length of signal propagation path which also results in gain enhancements. The parameters of the antennas are studied and optimized by using commercially available Computer Simulation Technology (CST) software. The proposed antennas are found to be efficient in terms of reflection coefficient, gain, efficiency and radiation pattern. Secondly, this study presents homogenous and realistic heterogeneous breast phantom simulation, fabrication and measurement in the lab environment for using in MI system. Tissue-mimicking materials are used for fabrication and the conductivity and dielectric parameters are measured for each tissue layer and compared with the theoretical results. Finally, experimental validation of the designed modified Vivaldi antennas was performed by designing and developing a microwave imaging system to detect tumors of approximately 1.5 cm radii inside multiple healthy and unhealthy breast phantoms of different configurations. The data collected from the proposed system were processed using the frequency domain-imaging algorithm, which reconstructs the image of breast interior to detect and localize the tumor using iteratively corrected coherence factor delay and sum (IC-CF-DAS) and iteratively corrected delay multiply and sum (IC-DMAS). The change of backscattered signals with the change of dielectric contents inside the structure of breast phantom is analyzed to produce 3D reconstructed image with 2.5 mm resolution. The signal to mean ratio (SMR) values for the reconstructed breast images respect to the antennas are 13.33 (Basic Vivaldi), 12.88 (SN) and 14.46 (INZ) individually. The optimized metamaterial loaded Vivaldi antenna based system can detect two distinct tumors in both homogenous and heterogeneous phantom, which is potentially viable for a low cost and portable medical imaging system.,Master of Science
dc.language.iso	eng
dc.publisher	UKM, Bangi
dc.relation	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina
dc.rights	UKM
dc.subject	Breast -- Cancer
dc.subject	Diagnostic imaging
dc.subject	Breast -- Diseases -- Diagnosis
dc.subject	Metamaterials
dc.subject	Microwave imaging
dc.subject	Universiti Kebangsaan Malaysia -- Dissertations
dc.subject	Dissertations, Academic -- Malaysia
dc.title	Metamaterial inspired Vivaldi antennas for microwave imaging of realistic breast phantom
dc.type	theses
dc.format.pages	128
dc.identifier.callno	RC280.B8I835 2020 3 tesis
dc.identifier.barcode	005643(2021)(PL2)
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

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