Przeglądanie według Temat "Magnetic Resonance Imaging"

Aktualnie wyświetlane 1 - 2 z 2

Functional MRI – how does it work?
(Wydawnictwo Uniwersytetu Rzeszowskiego, 2017) Truszkiewicz, Adrian; Aebisher, David; Przypek, Aneta; Guz, Wiesław; Bartusik-Aebisher, Dorota
Magnetic Nuclear Resonance (MRI) is a non-invasive tissue imaging method. This technique is based on the influence of a strong magnetic field and electromagnetic wave of strictly defined frequency on the nucleus of elements with non-zero spin. The study describes one of the variants of functional MRI, (fMRI), which has become a key technique in brain imaging. This technique has excellent spatial and temporal resolution and involves a changing signal intensity depending on the degree of oxygenation of the blood. Blood oxygenation levels are known to vary in accordance with neural activity and these differences can be used to detect brain activity. This is due to increased demand for energy and oxygen in the area of increased neural activity. The basis of this imaging is the so-called Blood Oxygenation-Level Dependent (BLOD) effect. The aim of this paper is to present the scope of fMRI as a diagnostic method in neurology and in neurosurgery. This paper presents the principles of fMRI, methods of application, research result development, and suggests areas of possible medical applications. The limitations of fMRI as a clinical tool in medical applications will also be addressed. Studies presented in this paper are based on clinical fMRI experience and a literature review.
The usefulness of relaxation time using MRI measurements
(Wydawnictwo Uniwersytetu Rzeszowskiego, 2018) Bober, Zuzanna; Aebisher, David; Truszkiewicz, Adrian; Ożóg, Łukasz; Bartusik-Aebisher, Dorota
Introduction. Magnetic Resonance Imaging methods are now frequently used for the analysis of the diseased tissue. These methods are based on the fact that the spin-lattice, T1, and the spin-spin, T2, relaxation times are different in diseased tissue as compared to that of normal tissue. Aim. Here we present measurements of spin-lattice relaxation time T1 on a Magnetic Resonance Imaging scaner with field strength 1.5 Tesla. Material and methods. Measurements of T1 relaxation time and analysis of literature. Results. We provide procedure for measurements of T1 relaxation time with field strength 1.5 Tesla and present a discussion of current applications.