M Tech Dissertations

Permanent URI for this collectionhttp://ir.daiict.ac.in/handle/123456789/3

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Subject: search.filters.subject.Microwave imaging

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    Antenna design and forward problem solution for brain stroke detection using microwave imaging
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2019) Uphad, Aishwarya Dinkar; Ghodgaonkar, Deepak
    In modern day technology, any neurological examination is carried forward by medical imaging using CT Scan, MRI or PET. These techniques provide better identification, location and the type of the stroke inside the head. However, these techniques are xpensive, ionizing, slow and immobile in nature. The aim is to achieve imaging using microwave radiation by using numerical brain phantom from CST Microwave Studio software. HFSS (High Frequency Structure software) is used to design the bowtie antenna and Vivaldi antenna for radiating microwave radiation in microwave imaging system. The thesis provides a system which is inexpensive, non-ionising, transportable and accurate that can replace existing diagnostic systems. Forward problem for microwave imaging for stroke detection is solved. The stroke is detected using antenna array of Vivaldi antenna and bowtie antenna. HFSS software is used to design and simulate the bowtie antenna. The bowtie antenna is fabricated and measured using vector network analyser (VNA). Bowtie antenna similar to Vivaldi antenna can be used to detect the stroke. It is observed that bowtie antenna is more directive in nature due to broadside radiation pattern with reasonable gain and antenna efficiency.
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    ItemOpen Access
    Microwave imaging of a 36-cell human body by moment method formulation
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2015) Chandarana, Mahek Harshad; Ghodgaonkar, Deepak
    Estimation of a complex permittivity is achieved using the moment method formulation of electric field integral equation. In addition to numerical results for three dimensional biological bodies, thesis also describes formulation of inverse problem, forward problem and the evaluation of matrix element. For excitation of the 36-cell human body with electric field, short dipole is used as transmitter, which is located in front and back side of the body. Thus, electric field at cell centroid locations are calculated using near field equation and electric field at N receiving dipole locations are stimulated using MAT LAB and thus complex permittivity are estimated from the inverse problem. This procedure is an ideal approach. But, in practical scenario, random and systematic errors occur which cannot be calculated in stimulation. Hence, it is taken into consideration by addition of Gaussian error to the received electric field at the receiver locations. Due to this process, error in the complex permittivity of a buried cells occurs in a large amount. Hence, multiple view technique is introduced in order to obtain the reduction in the error of complex permittivity of buried cells.