Title :
Correction of inhomogeneities in Magnetic Resonance Images
Author :
Noterdaeme, Olivier ; Brady, Michael
Author_Institution :
Wolfson Medical Vision Laboratory, Department of Engineering Science, University of Oxford, OX1 3PJ, UK
Abstract :
This paper presents a method by which two fast spoiled gradient echo image volumes can be used to estimate the slowly varying intensity variation frequently observed in Magnetic Resonance Images (MRI). We first present results for simulated brain MRI, where we compare the performance of a segmentation algorithm on uncorrected, corrected and artifact free images. Next, we present the results for a real uniform phantom and then for clinical spinal images, where our algorithm reduces the intensity variation within a tissue class from a factor of 30 to a factor of 2. The technique and algorithm has been successfully tested on over 1000 images acquired with different coils, sequences and anatomies.
Keywords :
Additive noise; Calibration; Coils; Image segmentation; Magnetic noise; Magnetic resonance; Magnetic resonance imaging; Nonuniform electric fields; Radio frequency; Tellurium; Algorithms; Brain; Computer Simulation; Humans; Imaging, Three-Dimensional; Magnetic Resonance Imaging; Phantoms, Imaging; Spine;
Conference_Titel :
Engineering in Medicine and Biology Society, 2008. EMBS 2008. 30th Annual International Conference of the IEEE
Conference_Location :
Vancouver, BC
Print_ISBN :
978-1-4244-1814-5
Electronic_ISBN :
1557-170X
DOI :
10.1109/IEMBS.2008.4649637