Simmons, A and Arridge, SR and Tofts, PS and Barker, GJ (1998) Application of the extremum stack to neurological MRI. IEEE T MED IMAGING , 17 (3) 371 - 382.
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The extremum stack, as proposed by Koenderink, is a multiresolution image description and segmentation scheme which examines intensity extrema (minima and maxima) as they move and merge through a series of progressively isotropically diffused images known as scale space. Such a data-driven approach is attractive because it is claimed to be a generally applicable and natural method of image segmentation, The performance of the extremum stack is evaluated here using the case of neurological magnetic resonance imaging data as a specific example, and means of improving its performance proposed, It is confirmed experimentally that the extremum stack has the desirable property of being shift-, scale-, and rotation-invariant, and produces natural results for many compact regions of anatomy, It handles elongated objects poorly, however, and subsections of regions may merge prematurely before each region is represented as a single node. It is shown that this premature merging can often be avoided by the application of either a variable conductance-diffusing preprocessing step, or more effectively, the use of an adaptive variable conductance diffusion method within the extremum stack itself in place of the isotropic Gaussian diffusion proposed by Koenderink.
|Title:||Application of the extremum stack to neurological MRI|
|Keywords:||extremum stack, image processing, magnetic resonance imaging (MRI), segmentation, variable conductance diffusion, MAGNETIC-RESONANCE IMAGES, SCALE-SPACE, EDGE-DETECTION, NONLINEAR DIFFUSION, MULTIPLE-SCLEROSIS, BRAIN, SEGMENTATION, VALIDATION, SURFACE, VOLUMES|
|UCL classification:||UCL > School of BEAMS > Faculty of Engineering Science > Computer Science|
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