Medical Image Computing and Computer-Assisted Intervention - MICCAI 2000

Scott L. Delp

ISBN 10: 3540411895 / ISBN 13: 9783540411895

Published by Springer Berlin Heidelberg, Springer Berlin Heidelberg Sep 2000, 2000

About this Item

This item is printed on demand - it takes 3-4 days longer - Neuware -In previous work [6], we presented a novel information theoretic approach for calculating fMRI activation maps. The information-theoretic approach is - pealing in that it is a principled methodology requiring few assumptions about the structure of the fMRI signal. In that approach, activation was quanti ed by measuring the mutual information (MI) between the protocol signal and the fMRI time-series at a givenvoxel.This measureis capable of detecting unknown nonlinear and higher-order statistical dependencies. Furthermore, it is relatively straightforward to implement. In practice,activation decisions at eachvoxelareindependent of neighboring voxels. Spurious responses are then removed by ad hoc techniques (e.g. morp- logicaloperators).Inthispaper,wedescribeanautomaticmaximumaposteriori (MAP) detection method where the well-known Ising model is used as a spatial prior.The Isingspatialpriordoes not assumethat the time-seriesofneighboring voxelsareindependentofeachother.Furthermore,removalofspuriousresponses is an implicit component of the detection formulation. In order to formulate the calculation of the activation map using this technique we rst demonstrate that the information-theoretic approach has a natural interpretation in the hypo- esis testing framework and that, speci cally, our estimate of MI approximates the log-likelihood ratio of that hypothesis test. Consequently, the MAP det- tion problem using the Ising model can be formulated and solved exactly in polynomial time using the Ford and Fulkerson method [4]. We compare the results of our approach with and without spatial priors to an approachbased on the general linear model (GLM) popularized by Fristonet al [3]. We present results from three fMRI data sets. The data sets test motor, auditory, and visual cortex activation, respectively. 1312 pp. Englisch.

Seller Inventory # 9783540411895

Bibliographic Details

• Title: Medical Image Computing and Computer-Assisted Intervention - MICCAI 2000
• Publisher: Springer Berlin Heidelberg, Springer Berlin Heidelberg Sep 2000
• Publication Date: 2000
• Language: English
• ISBN 10: 3540411895
• ISBN 13: 9783540411895
• Binding: Taschenbuch
• Condition: Neu
• Dimensions: 235W x 155H x 71D millimeters 235 millimeters width by 155 millimeters height by 71 millimeters depth
• Weight: 1956 grams

About this title

Synopsis

visual cortex activation, respectively.