Journal
NEUROSCIENCE LETTERS
Volume 308, Issue 3, Pages 141-144Publisher
ELSEVIER SCI IRELAND LTD
DOI: 10.1016/S0304-3940(01)01920-6
Keywords
blood oxygen level dependent imaging; motor activation; age dependency; functional magnetic resonance imaging; principles of echo shifting with a train of observations; gender difference
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Right handed healthy volunteers underwent functional magnetic resonance imaging (fMRI) examinations on a 1.5 Tesla MRI-scanner (Gyroscan ACS NT; Philips, Best, NL). Blood oxygen level dependent (BOLD) images were obtained using a three dimensional multi-shot echo planar imaging sequence employing a shifted echo technique (Principles of echo shifting with a train of observations), Finger tapping of the right hand was used as a task for motor stimulation. A total of 86 subjects was included into statistical analysis. Absolute and relative signal differences and cluster sizes of activation for the left motor cortex were obtained. In addition, Z-score, pooled Z-score and cross correlation activation maps were calculated and matched with high resolution anatomic images. A significant decrease with age could be detected for absolute and relative signal intensity differences for the whole group and for the male subgroup. Correlation analysis for the female subgroup also bore negative albeit non-significant correlation coefficients. An age-related decline of BOLD-contrast can be assumed to explain signal decrease. This age-related effect should be considered in clinical fMRI applications. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.
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