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Cited by 4,212Advanced MRI Techniques and ApplicationsAdvanced Neuroimaging Techniques and ApplicationsOptical Imaging and Spectroscopy Techniques

The DOI matches its Crossref record; 30 of the 30 references it cites were found in a registry or an index.

Dynamic magnetic resonance imaging of human brain activity during primary sensory stimulation.

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Kwong, K K, Belliveau, J W, Chesler, D A, Goldberg, I E, Weisskoff, R M, Poncelet, B P, Kennedy, D N, Hoppel, B E, Cohen, M S, Turner, R·1992·Proceedings of the National Academy of Sciences
DOI 10.1073/pnas.89.12.5675PMC PMC49355
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Abstract

Neuronal activity causes local changes in cerebral blood flow, blood volume, and blood oxygenation. Magnetic resonance imaging (MRI) techniques sensitive to changes in cerebral blood flow and blood oxygenation were developed by high-speed echo planar imaging. These techniques were used to obtain completely noninvasive tomographic maps of human brain activity, by using visual and motor stimulus paradigms. Changes in blood oxygenation were detected by using a gradient echo (GE) imaging sequence sensitive to the paramagnetic state of deoxygenated hemoglobin. Blood flow changes were evaluated by a spin-echo inversion recovery (IR), tissue relaxation parameter T1-sensitive pulse sequence. A series of images were acquired continuously with the same imaging pulse sequence (either GE or IR) during task activation. Cine display of subtraction images (activated minus baseline) directly demonstrates activity-induced changes in brain MR signal observed at a temporal resolution of seconds. During 8-Hz patterned-flash photic stimulation, a significant increase in signal intensity (paired t test; P less than 0.001) of 1.8% +/- 0.8% (GE) and 1.8% +/- 0.9% (IR) was observed in the primary visual cortex (V1) of seven normal volunteers. The mean rise-time constant of the signal change was 4.4 +/- 2.2 s for the GE images and 8.9 +/- 2.8 s for the IR images. The stimulation frequency dependence of visual activation agrees with previous positron emission tomography observations, with the largest MR signal response occurring at 8 Hz. Similar signal changes were observed within the human primary motor cortex (M1) during a hand squeezing task and in animal models of increased blood flow by hypercapnia. By using intrinsic blood-tissue contrast, functional MRI opens a spatial-temporal window onto individual brain physiology.

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Crossref · 10.1073/pnas.89.12.5675

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Metadata

Authors
Kwong, K. K., Belliveau, J. W., Chesler, D. A., Goldberg, I. E., Weisskoff, R. M., Poncelet, B. P., Kennedy, D. N., Hoppel, B. E., Cohen, M. S., & Turner, R.
Affiliations
Massachusetts General Hospital (US)
ORCID
Venue
Proceedings of the National Academy of Sciences
Publisher
National Academy of Sciences
Published
1992-06-15
Volume
89
Issue
12
Pages
5675-5679
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
DOI
10.1073/pnas.89.12.5675
PMC
PMC49355
OpenAlex
W2002660165
Cited by
4,212
References
30
Citations by year
2026: 51 · 2025: 75 · 2024: 70 · 2023: 75 · 2022: 100 · 2021: 91 · 2020: 75 · 2019: 81 · 2018: 82 · 2017: 103 · 2016: 97 · 2015: 118 · 2014: 125 · 2013: 132 · 2012: 161
FWCI
114.62
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Max Planck Digital Library (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
Funders
  • National Institutes of Health (5p01ca048729-13, 5r01ca040303-11)
  • National Heart, Lung, and Blood Institute (R01HL039810, R01-HL39810)
  • National Cancer Institute (5PO1CA48729-02, R01-CA40303)
Topics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced MRI Techniques and Applications
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Optical Imaging and Spectroscopy Techniques
Keywords
functional MRI, cerebral blood flow, cerebral oxygenation, primary visual cortex, primary motor cortex, photic stimulation, hypercapnia, echo planar imaging, T1-weighted imaging, deoxyhemoglobin, stimulation frequency dependence, brain activation
MeSH terms
Animals, Brain, Cerebrovascular Circulation, Humans, Functional Laterality, Magnetic Resonance Imaging, Mathematics, Models, Theoretical, Magnetic Resonance Spectroscopy, Oxygen, Photic Stimulation, Physical Stimulation, Rabbits, Time Factors, Touch, Visual Cortex

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