Reconstruction of the Image of the MRI Signal Using IFFT technique

Nuclear magnetic resonance (NMR) tomography has recently emerged as a powerful Imaging technique in the medical field because of high resolution capability and potential for chemical specific imaging.

NMR images are essentially a map of the distribution density of hydrogen nuclei and parameters reflecting their motion, in cellular water and lipids. The total avoidance of ionising radiation, its lack of known hazard and penetration of bone and air without attenuation make it particularly attractive non-invasive imaging technique. A conventional X-ray Scanner can produce an image only at right angles to the axis of the body, where as NMR Scanner can produce any desired cross-section, a distinct advantage to the radiologist.

The monitored on-line signal which is already stored, is taken. This signal is FFT signal of the source signal, we perform IFFT to the MRI signal and get back the original source signal.

NMR takes much longer time to construct an image. Efforts to produce multiple slices during a single NMR exposure have been made to reduce scanning time. The collection of data from the whole sample, so called volume scanning, allows a very large number of continuous slices to be generated which would take many times longer to produce if collected as single slices.