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• W2113644931 startingPage "485" @default.
• W2113644931 abstract "Purpose: To determine the concurrence of activation in the primary motor cortex, induced by paradigms of active and passive movement of extremities, by using blood oxygen level–dependent functional magnetic resonance (MR) imaging. Materials and Methods: The HIPAA-compliant study was approved by the institutional review board, and written informed consent was obtained from the participating volunteers. Functional MR imaging data were collected from 11 healthy volunteers (four women, seven men; age range, 24–42 years) during active and passive movements of hand, elbow, shoulder, ankle, knee, and hip. These data were then mapped onto three-dimensional anatomic images. Volumes of activation were determined by using cross-correlation analysis at a coefficient threshold of 0.4 (P < .01). Regions of interest were drawn in pre- and postcentral gyri based on anatomic criteria. The mean number of activated voxels in the pre- and postcentral gyri induced by active and passive movements was compared by using Wilcoxon analysis. Concurrence ratios and proportional ratios of activation between active and passive movements were calculated for each somatotopic location. Results: Primary motor cortex activation tended to increase with active compared with passive movements, although in the precentral gyrus, hand, elbow, and shoulder movements showed no statistically significant difference in mean number of activated voxels. In the postcentral gyrus, only the shoulder revealed a significant difference (P < .05). Concurrence ratios (activation volume overlap of two tasks/combined activation area of both tasks) ranged from 0.44 to 0.57. Proportional ratios (activation volume overlap of passive task with active task/total activation volume of passive task) ranged from 0.64 to 0.82. Conclusion: Passive movement paradigms may be an alternative to or complement to active movement tasks in patient populations. © RSNA, 2009" @default.
• W2113644931 created "2016-06-24" @default.
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• W2113644931 date "2009-05-01" @default.
• W2113644931 modified "2023-09-27" @default.
• W2113644931 title "Motor Homunculus: Passive Mapping in Healthy Volunteers by Using Functional MR Imaging—Initial Results" @default.
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• W2113644931 doi "https://doi.org/10.1148/radiol.2512080231" @default.
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