Spatial Encoding (Localization of signal) in Magnetic Resonance Imaging (MRI)- A Review
Abstract
Magnetic Resonance Imaging (MRI) is a vital diagnostic tool in medicine, providing clear images of the body's internal structures. A key component of MRI is signal localization or the spatial encoding of data. Signal localization refers to the ability to map the MRI signals to precise anatomical locations, which is essential for accurate image reconstruction. Unlike in CT and plain films in which localisation of the signal is simple (an x-ray beam travels through the patient and then detected by the detectors) MRI is much more complicated. With MRI the signal is localised in the 3D space by manipulating the magnetic properties of the nuclei in a predictable way. The signals are then returned with a particular frequency and phase and these are slotted into their respective locations. The MRI system locates signal, so that it can position each signal at the correct point of the image.
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