Test-retest precision of functional MR in sensory and motor task activation. AJNR Am J Neuroradiol 1996 Jan;17(1):95-8
Date
01/01/1996Pubmed ID
8770256Pubmed Central ID
PMC8337954Scopus ID
2-s2.0-0030064437 (requires institutional sign-in at Scopus site) 110 CitationsAbstract
PURPOSE: To determine the test-retest precision of functional MR maps of regions in the brain "activated" by sensory, motor, and cognitive tasks.
METHODS: Echo-planar images were acquired at 1.5 T in four subjects during voluntary motor activity involving the thumb and fingers and during tactile stimulation of the palm. Each subject performed the two tasks twice. Functional images of each task were generated at three thresholds. Test-retest precision was calculated in terms of two ratios: 1) the pixels activated in both iterations of the tasks in proportion to the pixels activated by either iteration of the task, and 2) the ratio modified to include first-order neighboring pixels. The first is referred to as pixel precision, and the latter as first-order-neighbor pixel precision.
RESULTS: In each subject, activation from the first and second iteration of each task was located in the same region of the same gyrus. Pixel precision was .57 for the two tasks (at a threshold of 0.50). First-order-neighbor precision was greater than .80 for the two tasks at the same threshold.
CONCLUSION: High test-retest precision can be obtained in functional MR.
Author List
Yetkin FZ, McAuliffe TL, Cox R, Haughton VMAuthor
Timothy L. McAuliffe PhD Professor in the Psychiatry and Behavioral Medicine department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AdultArousal
Artifacts
Brain
Brain Mapping
Echo-Planar Imaging
Female
Fingers
Frontal Lobe
Hand
Humans
Image Processing, Computer-Assisted
Magnetic Resonance Imaging
Male
Motor Activity
Parietal Lobe
Reference Values
Regional Blood Flow
Reproducibility of Results
Touch
