Article

# Online orientation distribution function reconstruction in constant solid angle and its application to motion detection in HARDI

International Symposium on Biomedical Imaging: From Nano to Macro DOI:http://hal.archives-ouvertes.fr/docs/00/55/98/84/ANNEX/poster.pdf
Source: OAI

ABSTRACT The diffusion orientation distribution function (ODF) can be reconstructed from q-ball imaging (QBI) to map the complex intravoxel structure of water diffusion. As acquisition time is particularly large for high angular resolution diffusion imaging (HARDI), fast estimation algorithms have recently been proposed, as an on-line feedback on the reconstruction accuracy. Thus the acquisition could be stopped or continued on demand. We adapt these real-time algorithms to the mathematically correct definition of ODF in constant solid angle (CSA), and develop a motion detection algorithm upon this reconstruction. Results of improved fiber crossing detection by CSA ODF are shown, and motion detection was implemented and tested in vivo.

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16 Oct 2012

### Keywords

acquisition time

angular resolution diffusion imaging

complex intravoxel structure

CSA

CSA ODF

diffusion orientation distribution function

fast estimation algorithms

fiber

mathematically correct definition

motion detection

motion detection algorithm

on-line feedback

QBI

reconstruction accuracy

water diffusion