Sub-millimeter fMRI at 1.5 Tesla: Correlation of high resolution with low resolution measurements
| Autor: | F.G.C. Hoogenraad, Jürgen R. Reichenbach, Serge A.R.B. Rombouts, Mark B. M. Hofman, E. Mark Haacke, Petra J. W. Pouwels |
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| Přispěvatelé: | ACS - Atherosclerosis & ischemic syndromes, ACS - Heart failure & arrhythmias, Amsterdam Neuroscience - Brain Imaging, NCA - Brain imaging technology, Physics and medical technology |
| Jazyk: | angličtina |
| Rok vydání: | 1999 |
| Předmět: |
Physics
Pixel medicine.diagnostic_test business.industry Partial volume Magnetic resonance imaging Filter (signal processing) Brain mapping Visual cortex medicine.anatomical_structure Nuclear magnetic resonance medicine Radiology Nuclear Medicine and imaging Millimeter Nuclear medicine business Functional magnetic resonance imaging |
| Zdroj: | Journal of Magnetic Resonance Imaging, 9(3), 475-482 |
| ISSN: | 1053-1807 |
| Popis: | Functional magnetic resonance imaging of the visual cortex with an in- plane resolution of 0.4 x 0.4 mm2 was performed using a simple visual stimulus resulting in clear maps of activation. A collapsing filter was used to compare these high-resolution images with low-resolution images collected during the same session. A good correspondence between the high- and low- resolution functional maps was found with respect to the center of localization of activation. However, only 20% of the size of activated areas in the low-resolution experiment was observed at high resolution. Which was partly caused by the difference in signal-to-noise ratio. The high-resolution images produce signal changes much higher than the low-resolution images due to reduced partial volume effects. Additionally, the high-resolution functional maps were compared with detailed anatomical and venous information. The activated areas were predominantly observed at venous vessels within the sulci with a diameter on the order of the pixel size. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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