NDLI: Correction of head movements in multi-slice EPI and single-slice gradient-echo functional MRI

Content Provider	IEEE Xplore Digital Library
Author	Singh, M. Al-Dayeh, L. Patel, P. Kim, T. Guclu, C. Nalcioglu, O.
Copyright Year	1998
Description	Author affiliation: Univ. of Southern California, Los Angeles, CA, USA (Singh, M.)
Abstract	The authors have investigated 2D and 3D registration techniques based on either simple rotational/translational movements or movements modeled as a first or second order polynomial to correct for assumed rigid and nonrigid body motion in fMRI. Data acquired with two different multi-slice echo planar imaging (EPI) systems and a single-slice conventional gradient-echo system (all at 1.5 T) were used to develop and evaluate the registration techniques. Two sets of data were acquired with EPI. In the first set, the subjects were asked to keep their head as stationary as possible while in the second set, subjects were asked to randomly move their head with displacements being on the order of 1 cm. Images from the second set were registered and compared to those obtained from the first set. Results show that 2D and 3D motion corrected images show lower variance to mean ratio than uncorrected images and that in most cases, polynomial based nonrigid body correction produces the lowest variance to mean ratios.
Starting Page	1354
Ending Page	1356
File Size	375918
Page Count	3
File Format	PDF
ISBN	0780342585
ISSN	10823654
DOI	10.1109/NSSMIC.1997.670572
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-11-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic resonance imaging Polynomials Magnetic heads Pixel Interpolation Alzheimer's disease Image generation Blood flow Eddy currents Nonlinear distortion
Content Type	Text
Resource Type	Article

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