Akademik Veri Yönetim Sistemi
Tezin Türü: Doktora
Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Türkiye
Tezin Onay Tarihi: 2009
Tezin Dili: İngilizce
Öğrenci: Volkan Emre Arpınar
Danışman: BEHÇET MURAT EYÜBOĞLU
Özet:In this study, analysis of Magnetic Resonance Imaging (MRI) in inhomogeneous main magnetic field is conducted. A numerical model based on Bloch equation is implemented for MRI, to understand effect of inhomogeneous magnetic field to Magnetic Resonance (MR) signal. Using the model, relations between inhomogeneity levels in main magnetic field with energy, decay time, bandwidth of the FID signal is investigated. Also relation between the magnetic field inhomogeneity and field of view is determined. To simulate measurement noise in the FID signal under inhomogeneous main magnetic field, noise model for MRI with homogeneous main field is altered. Following the numerical model development an image reconstruction algorithm for inhomogeneous main magnetic field is developed to remove undesirable effect of field inhomogeneity in image reconstruction. To evaluate capability of the reconstruction algorithm, the algorithm is tested for several input parameters which results in different noise levels in the FID signal. Then reconstruction errors are analysed to gain information about feasibility of MRI in inhomogeneous main magnetic field.